02094nas a2200241 4500008004100000022001400041245009900055210006900154260008400223300001200307490000800319520120900327653001301536653001801549653002701567653001901594653002001613653002101633100001701654700003101671700002001702856013001722 2006 eng d a1549-329600aPreparation and characterization of novel hybrid of chitosan-g-lactic acid and montmorillonite0 aPreparation and characterization of novel hybrid of chitosanglac aDIV JOHN WILEY & SONS INC, 111 RIVER ST, HOBOKEN, NJ 07030 USAbWILEY-LISScAUG a372-3820 v78A3 a

The utilization of biopolymers and the development of organic-inorganic hybrids are ever increasing interest of material science researchers around the globe for various applications. The present attempt is intended to prepare nanocomposites of lactic acid grafted chitosan and layered silicates. Nanocomposites were prepared by dissolving chitosan and dispersing sodium montmorillonite in aqueous solution of L-lactic acid with subsequent heating and film casting. They were characterized by conventional techniques such as Fourier transform infrared spectroscopy, X-ray diffractometry, thermogravimetric analysis, energy dispersive X-ray spectroscopy, and elemental analysis. The results from polar optical and transmission electron microscopic measurements are also discussed. Sorption behavior of samples has been followed by measuring swelling degree and contact angle. The films have shown enhanced hydrophilicity when compared with polylactic acid (PLA). Issues on the interactions of polycationic chitosan with clay are also discussed. It is observed that nanocomposites are exhibiting better thermal and physical properties than neat chitosang-LA and PLA. (c) 2006 Wiley Periodicals, Inc.

10aChitosan10acontact angle10agraft copolymerization10aNanocomposites10apolylactic acid10awater absorption1 aDepan, Dilip1 aKumar, Annamalai, Pratheep1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/preparation-and-characterization-novel-hybrid-chitosan-g-lactic-acid-and-montmorillonite-001241nas a2200205 4500008004100000022001400041245013900055210006900194260010600263300001400369490000800383520037800391653002300769653003400792653001900826653001600845100003100861700002000892856012300912 2007 eng d a0957-416600aNovel hybrid of clay, cellulose, and thermoplastics. I. preparation and characterization of composites of ethylene-propylene copolymer0 aNovel hybrid of clay cellulose and thermoplastics I preparation  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcMAY a2672-26820 v1043 a

{The present study is aimed to prepare hybrid materials by incorporating layered silicates and microcrystalline cellulose into thermoplastic polymer. Using ethylene-propylene (EP) copolymer as thermoplastic polymer matrix and maleated EP (MEP) copolymer as compatibilizer, three types of composites were prepared by (i) melt mixing of cellulose with thermoplastics [

10aabrupt contraction10aArbitrary Lagrangian Eulerian10afinite element10asimulations1 aKumar, Annamalai, Pratheep1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/novel-hybrid-clay-cellulose-and-thermoplastics-i-preparation-and-characterization-002388nas a2200193 4500008004100000022001400041245010900055210006900164260009800233300001200331490000700343520154600350653003701896653006701933100002202000700002002022700002002042856013202062 2007 eng d a1042-714700aPhoto-stabilization of EPDM-clay nanocomposites: effect of antioxidant on the preparation and durability0 aPhotostabilization of EPDMclay nanocomposites effect of antioxid aTHE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLANDbJOHN WILEY & SONS LTDcNOV a891-9000 v183 a

The present study is to examine the photo-stabilization effect of an antioxidant on the photo-oxidation of ethylene-propylene-diene monomer (EPDM)-clay nanocomposites. During the preparation of EPDM-clay nanocomposites via melt processing antioxidants are usually incorporated along with clay, which allows phenolic antioxidant molecules to get adsorbed onto acidic clay platelets and their interaction with metallic impurities reduces the stabilizing efficiency of the antioxidant. The nanocomposites were obtained by solution dispersion followed by melt compounding of EPDM and organophilic montmorillonite (OMMT). The samples were characterized by conventional tools such as X-ray diffraction (XRD), Fourier Transform Infra Red (FT-IR) spectroscopy, and thermo-gravimetric analysis (TGA). It was found, upon photo-irradiation (lambda > 290 nm) studies by following the changes in functional groups and surface morphology, that photo-degradation was lowered by the antioxidant and the efficiency of the antioxidant could be improved by initial incorporation of antioxidant in the EPDM matrix. In EPDM-clay nanocomposites, a stabilizing activity of the antioxidant was observed above some threshold concentration of the antioxidant. The relationship between the nanoclay reinforcement and stabilizing efficiency in terms of photo-oxidation and surface morphology for their applicability are discussed. The methodology adopted for this study is also justified through our observation. Copyright (C) 2007 John Wiley & Sons, Ltd.

10aethylene-propylene-diene monomer10ananocomposites photo-degradation antioxidant and stabilization1 aLonkar, Sunil, P.1 aKumar, Pratheep1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/photo-stabilization-epdm-clay-nanocomposites-effect-antioxidant-preparation-and-durability-001432nas a2200181 4500008004100000022001400041245012100055210006900176260008900245300002000334520068100354653000901035653002301044653001901067100002001086700002001106856012401126 2007 eng d a1618-722900aSynthesis, characterization, and performance evaluation of polymeric hindered amine light stabilizers (HALS) in EPDM0 aSynthesis characterization and performance evaluation of polymer a1, QUAI LEZAY-MARNESIA, F067000 STRASBOURG, FRANCEbEUROPEAN POLYMER FEDERATIONcAPR aArticle No. 0383 a

Polymeric hindered amine light stabilizer (HALS), wherein the hindered amine functionality was attached to the brominated ethylene-propylene-diene terpolymer (EPDM) was synthesized. The brominated EPDM was synthesized as an intermediate for the synthesis of a new polymeric hindered amine light stabilizer. The grafting and functionalization reactions were characterized by FTIR and (HNMR)-H-1 spectroscopy. The photostabilizing efficiency of this polymeric HALS was studied and compared with conventional HALS under accelerated weathering conditions. The results of the study give evidence for superiority of polymeric HALS over that of melt blended conventional HALS.

10aEPDM10aPhotostabilization10apolymeric HALS1 aRana, Sravendra1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/synthesis-characterization-and-performance-evaluation-polymeric-hindered-amine-light01830nas a2200205 4500008004100000022001400041245010600055210006900161260009900230300001400329490000700343520102100350653001801371653001401389653003901403653001101442100003101453700002001484856012001504 2008 eng d a0960-852400aBiocomposites of cellulose reinforced starch: improvement of properties by photo-induced crosslinking0 aBiocomposites of cellulose reinforced starch improvement of prop aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcDEC a8803-88090 v993 a

In the present study, the composite films have been prepared from the aqueous dispersions of starch with microcrystalline cellulose using glycerol as plasticizer and irradiated under ultraviolet (UV) light using sodium benzoate as photo-sensitizer. Photocrosslinking was characterized by measuring the water absorption under 100% relative humidity, swelling degree and gel fraction in dimethylsulphoxide (DMSC), upon irradiation time. Both, the incorporation of cellulose and photo-irradiation were found to decrease the water absorption, swelling in DMSO and increase the gel fraction. Thermal transitions indicated the anti-plasticization of amylopectin chains at the fiber/matrix interface. With increasing content of cellulose and photo-irradiation time, the tensile modulus and strength were found to improve. It is summarized that the combination of cellulose reinforcement and photo-crosslinking of matrix has improved the physical and mechanical properties. (C) 2008 Elsevier Ltd. All rights reserved.

10aBiocomposites10acellulose10aPhoto-irradiation and crosslinking10aStarch1 aKumar, Annamalai, Pratheep1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/biocomposites-cellulose-reinforced-starch-improvement-properties-photo-induced-001736nas a2200157 4500008004100000022001400041245010700055210006900162260005700231300001200288490000700300520109800307100002501405700002001430856012801450 2008 eng d a0170-083900aCationic polymerization of epoxides using novel xanthenyl phosphonium salts as thermo-latent initiator0 aCationic polymerization of epoxides using novel xanthenyl phosph a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcJUN a755-7630 v603 a

The present article describes the effect of steric and electronic factors on the efficiency of initiators based on novel xanthenyl phosphonium salts for cationic polymerization of epoxide monomers. 2-substituted (I(H), I(Cl), I(Me), and I(OMe)) xanthenyl phosphonium hexafluoroantimonate were synthesized and characterized by NMR ((1)H, (13)C and (31)P) and IR spectroscopy. The order of initiator activity in polymerization of glycidyl phenyl ether (GPE), was found as I(H)> I(Cl)> I(Me)> I(OMe). To understand the effect of steric factor, the polymerization of cyclohexene oxide (CHO) was performed and the order of activity was found as I(Cl)> I(H)> I(Me) > I(OMe). All the initiators were found to be latent at ambient temperature and initiates polymerization on thermal initiation. The order of initiator activity was influenced by electronic and steric factors in the system. The thermal stability of these salts was measured by Thermo gravimetric analysis (TGA). The solubility of the initiators in various organic solvents and epoxy monomers is also discussed.

1 aGupta, Mukesh, Kumar1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/cationic-polymerization-epoxides-using-novel-xanthenyl-phosphonium-salts-thermo-latent-002592nas a2200241 4500008004100000022001400041245008600055210006900141260012000210300001100330490000600341520171600347653002502063653001502088653000902103653002202112653001302134100002702147700002302174700002002197700002102217856011202238 2008 eng d a1468-699600aDurability of crosslinked polydimethylsyloxanes: the case of composite insulators0 aDurability of crosslinked polydimethylsyloxanes the case of comp aNATL INST MATERIALS SCIENCE, 1-2-1 SENGEN, TSUKUBA-CITY, IBARAKI, 305-0047, JAPANbNATL INST MATERIALS SCIENCEcJUN a0244060 v93 a

Most applications of silicones are linked to their hydrophobic properties and (or) their high resistance to ageing (e. g. thermal ageing and photoageing). However, when placed in extreme environments, these materials can fail as in the case of epoxy/fiber glass composite powerlines insulators, where crosslinked polymethylsyloxanes (PDMSs) are used as the protective envelope (housing) of the insulator. We report on the behavior of both pure/noncrosslinked PDMSs and typical formulations used in industrial insulators, i.e. containing peroxide crosslinked PDMS, alumina trioxide hydrated (ATH) and silica. Special attention is paid on both (i) the sources of potential degradation and (ii) the best analytical methods that can be applied to the study of very complex formulations. (i) Aside from conventional types of ageing such as photo-ageing and thermal, hydrolytic, and service life ageings, treatments with acidic vapors, plasma and ozone possibly generating species from the reaction of a high electric field with air were also performed, which allowed to accelerate electrical and out-door ageings and to obtain differently aged materials. (ii) Aside from conventional analytical methods of polymer degradation such as FTIR/ATR spectroscopy and SEC, TG, hardness measurements, more specific methods like photo/DSC, TG/IR, thermoporosimetry, resistivity and density measurements were also performed to characterize the chemical and physical evolutions of polymer materials. In particular, it was found that treatment with nitric acid vapor has detrimental effects on the properties of both fire retardants (e. g. ATH) and PDMSs, affecting the hardness and resistivity of the formulated material.

10acomposite insulators10adurability10aPDMS10apost-crosslinking10asilicone1 aDelor-Jestin, Florence1 aTomer, Namrata, S.1 aSingh, Raj, Pal1 aLacoste, Jacques uhttps://library.ncl.res.in/content/durability-crosslinked-polydimethylsyloxanes-case-composite-insulators-001975nas a2200229 4500008004100000022001400041245009900055210006900154260008400223300001200307490000700319520114300326653001301469653002701482653001901509653000901528653002101537100001701558700002001575700002001595856013001615 2008 eng d a1552-497300aPreparation and characterization of novel hybrid of chitosan-g-PDMS and sodium montmorrilonite0 aPreparation and characterization of novel hybrid of chitosangPDM aDIV JOHN WILEY & SONS INC, 111 RIVER ST, HOBOKEN, NJ 07030 USAbWILEY-LISScJAN a184-1900 v843 a

Preparation and properties of Chitosan (CS)-clay nanocomposites grafted with polydimethyl siloxane (PDMS) with different clay ratios are herein discussed. CS is intercalated into sodium montmorrilonite and PDMS is grafted onto CS under UV irradiation. Sample films of CS intercalated into clay and grafted with PDMS were prepared by solvent casting method with varying amount of nanoclay and PDMS. They were characterized by conventional techniques such as X-ray diffractometry, fourier transform infrared spectroscopy, C-13 NMR, thermo gravimetric analysis, and differential thermal analysis. Sorption behavior of samples has been followed by measuring swelling degree and issues on the interactions of biopolymers with clay are also discussed. The water absorption of composites films reduces with an increase in the amount of incorporated clay. This is due to the barrier formation in the form of cross-linking points, which prevents water permeation into CS. The amount of adsorbed water is more, when the amount of CS exceeds the amount of PDMS. This shows high water retention capacity of CS. (c) 2007 Wiley Periodicals, Inc.

10aChitosan10agraft copolymerization10aNanocomposites10aPDMS10awater absorption1 aDepan, Dilip1 aKumar, Bijandra1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/preparation-and-characterization-novel-hybrid-chitosan-g-pdms-and-sodium-montmorrilonite-002154nas a2200229 4500008004100000022001400041245012600055210006900181260009900250300001100349490000600360520126800366653001301634653000901647653002301656653002601679653001901705100001701724700003101741700002001772856013201792 2009 eng d a1742-706100aCell proliferation and controlled drug release studies of nanohybrids based on chitosan-g-lactic acid and montmorillonite0 aCell proliferation and controlled drug release studies of nanohy aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcJAN a93-1000 v53 a

The present paper reveals the potential uses of novel hybrids of chitosan-g-lactic acid and sodium montmorillonite (MMT) in controlled drug delivery and tissue engineering applications. The drug-loaded novel nanohybrid films and porous scaffolds have been prepared by solvent casting and freeze-drying of the grafted polymer solution, respectively. Sodium Ibuprofen was loaded into nanohybrids of chitosan-g-lactic acid/sodium montmorillonite (CS-g-LA/MMT). Grafting of lactic acid and the drug loading were characterized by Fourier transform infrared spectroscopy. Formation of intercalated nanocomposites was confirmed by X-ray diffraction. Mechanical properties measurements have shown improvement in modulus and strength with expense of elongation by MMT reinforcement. The nanohybrids were found to be stable regardless of pH of the medium. The cell proliferation profile also shows that prepared nanohybrids are biocompatible. MMT reinforcement was found to control the drug (Ibuprofen) release rate in phosphate buffer saline solution (pH 7.4). MMT clay is therefore a viable additive for formulating sustained drug delivery systems based on lactic acid grafted chitosan. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

10aChitosan10aclay10aControlled release10adrug delivery systems10aNanocomposites1 aDepan, Dilip1 aKumar, Annamalai, Pratheep1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/cell-proliferation-and-controlled-drug-release-studies-nanohybrids-based-chitosan-g-lactic-002260nas a2200253 4500008004100000022001400041245009700055210006900152260010600221300001200327490000700339520132300346653002101669653000901690653003401699653001901733653001801752653001201770100003101782700001701813700002601830700002001856856013001876 2009 eng d a0079-670000aNanoscale particles for polymer degradation and stabilization-trends and future perspectives0 aNanoscale particles for polymer degradation and stabilizationtre aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcJUN a479-5150 v343 a

The field of nanoscience and nanotechnology is extending the applications of physics, chemistry, biology, engineering and technology into previously unapproached infinitesimal length scales. The polymer-nanoparticles/nanocomposites have been the exponentially growing field of research for developing the materials in last few decades and have been mainly focusing on the structure-property relationships and their development. Since the polymer-nanocomposites have been the staple of modern polymer industry, their durability under various environmental conditions and degradability after their service life are also essential fields of research. Thus, this article is intended to review the status of worldwide research in this aspect. Among various nanoparticulates, clay minerals and carbon nanotubes are more often used in enhancing physical, mechanical and thermal properties of polymers. In very few systems, the nano particulates have been incorporated into polymer as `nano-additives' for both purposes: degradation and stabilization of polymers. The degradation and durability of polymers is reviewed in the presence of nanoparticles/nanocomposites under different environmental conditions. Nanoparticle-induced biodegradation of polymers is also discussed. (c) 2009 Elsevier Ltd. All rights reserved.

10aCarbon nanotubes10aclay10aDegradation and stabilization10aNanocomposites10aNanoparticles10aPolymer1 aKumar, Annamalai, Pratheep1 aDepan, Dilip1 aTomer, Namrata, Singh1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/nanoscale-particles-polymer-degradation-and-stabilization-trends-and-future-perspectives-002153nas a2200217 4500008004100000022001400041245008800055210006900143260005700212300001200269490000700281520136000288653003301648653002801681653001401709653002101723653002401744100002501768700002001793856012201813 2009 eng d a0170-083900aNovel allylic phosphonium salts in free radical accelerated cationic polymerization0 aNovel allylic phosphonium salts in free radical accelerated cati a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcMAR a271-2800 v623 a

In the present study, the synthesis and evaluation of novel allylic phosphonium salts as addition fragmentation agents in combination of conventional (photo-/thermal) free radical source for cationic polymerization are described. The amide based allylic phosphonium salts, namely 2-(N, N-dimethylcaboxy-propenyl) triphenylphosphonium hexafluoroantimonate (DMTPH) and 2-(morpholinocarboxy-propenyl) triphenyl phosphonium hexafluoroantimonate (MTPH) were synthesized and characterized. The thermal and photo-latency of these salts was examined with and without free radical sources in bulk polymerization of cyclohexene oxide (CHO) salts at 70 A degrees C and lambda > 290 nm irradiation, respectively. In presence of thermal free radical source, the order of activity was observed as PAT > BPO > AIBN. The order of activity of free radical sources on photopolymerization was found to be benzoin > benzophenone > TMDPO. In addition, photopolymerization of other cationically polymerizable monomers (such as n-butyl vinyl ether, isobutyl vinyl ether, N-vinyl carbazole and glycidyl phenyl ether) was also examined at lambda > 290 nm irradiation. It is concluded that the rate of cationic polymerization can be accelerated using novel phosphonium salts with combination of free radical sources, by both thermal and photochemical mode.

10aAddition fragmentation agent10aCationic polymerization10aInitiator10aphosphonium salt10aPhotopolymerization1 aGupta, Mukesh, Kumar1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/novel-allylic-phosphonium-salts-free-radical-accelerated-cationic-polymerization-002023nas a2200217 4500008004100000022001400041245010200055210006900157260006800226300001400294490000800308520121900316653002801535653002601563653001501589653002101604653001701625100002501642700002001667856011801687 2009 eng d a0021-899500aNovel dibenzocycloheptenyl phosphonium salts as thermolatent initiator in cationic polymerization0 aNovel dibenzocycloheptenyl phosphonium salts as thermolatent ini a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcJUN a3707-37130 v1123 a

In this study, novel thermolatent cationic initiators based on dibenzocycloheptenyl phosphonium salts (1a, 1b, 1c, 1d, 2a, and 3a) were synthesized and their efficiency was examined in bulk polymerization of glycidyl phenyl ether (GPE). The polymerization of GPE was performed with 1 mol % of dibenzocycloheptenyl triphenylphosphonium salts (1a-1d) with different counter anions (SbF(6)(-), PF(6)(-), AsF(6)(-), and BF(4)(-)) at 25-200 degrees C for 1 h. The order of initiator activity was found as 1a > 1d > 1b > 1c. To examine the effect of phosphine moiety, the activity of la was compared with dibenzocycloheptenyl-tri-n-butylphosphonium hexafluoroantimonate (2a). The order of initiator activity was observed as 1a > 2a. The initiator activity of la was compared with that of 10,11-dihydro-dibenzocycloheptenyltriphenylphosphonium hexafluoroantimonate (3a) to understand the effect of extended conjugation in dibenzocycloheptenyl ring. In general, with the increase in the polymerization temperature, conversion (%) also increases. The solubility of initiators in various solvents and epoxy monomers was also examined. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 3707-3713, 2009

10aCationic polymerization10aglycidyl phenyl ether10ainitiators10aphosphonium salt10athermolatent1 aGupta, Mukesh, Kumar1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/novel-dibenzocycloheptenyl-phosphonium-salts-thermolatent-initiator-cationic-001837nas a2200205 4500008004100000022001400041245011100055210006900166260005700235300001200292490000700304520105400311653002801365653002601393653002201419653001801441100002501459700002001484856012701504 2009 eng d a1598-503200aThermally induced cationic polymerization of glycidyl phenyl ether using novel xanthenyl phosphonium salts0 aThermally induced cationic polymerization of glycidyl phenyl eth a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcAPR a221-2260 v173 a

The present study firstly describes the synthesis of novel, thermo-latent initiators based on xanthenyl phosphonium salts with different counter anions and phosphine moieties and secondly examines their efficiency in the bulk polymerization of glycidyl phenyl ether (GPE). The polymerization was performed with phosphonium salt initiators (I(SbF6), I(PF6), I(AsF6) and I(BF4)) at ambient temperature to 200 degrees C for 1 h. The order of initiator activity was I(SbF6) > I(PF6) > I(AsF6) > I(BF4). To examine the effect of the phosphine moiety on the initiator activity, polymerization was carried out with I(SbF6) (Ph(3)P) and II(SbF6) (Bu(3)P) at ambient temperature to 170 degrees C for 1 h. The order of reactivity was I(SbF6) > II(SbF6). In general, the conversion percentage increased with increasing polymerization temperature. The thermal stability of these salts was measured by then-no gravimetric analysis (TGA). The solubility of phosphonium salts in various organic solvents and epoxy monomers was also investigated.

10aCationic polymerization10aglycidyl phenyl ether10aphosphonium salts10athermo-latent1 aGupta, Mukesh, Kumar1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/thermally-induced-cationic-polymerization-glycidyl-phenyl-ether-using-novel-xanthenyl-001934nas a2200265 4500008004100000022001400041245015900055210006900214260005700283300001200340490000700352520097600359653001301335653001701348653001801365653001501383653002501398100001701423700002401440700002001464700001401484700002201498700001801520856013001538 2010 eng d a1598-503200aEnhancement of thermal stability and phase relaxation behavior of chitosan dissolved in aqueous l-lactic acid: using `silver nanoparticles' as nano filler0 aEnhancement of thermal stability and phase relaxation behavior o a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcAUG a713-7200 v183 a

Chitosan films with various compositions of silver nanoparticles were prepared by solution casting with an aqueous solution of chitosan and l-lactic acid. The chitosan/Ag nanocomposites were characterized by wide angle Xray diffraction (WAXD) and UV-vis spectroscopy. An analysis of the surface topography and size of the Ag nanoparticles (<= 100 nm) were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM), respectively. Thermogravimetric analysis (TGA/DTA) confirmed the increase in thermal stability with increasing Ag nanoparticle content in the nanocomposites. Dynamic thermal analysis (DMA) was used to examine the phase relaxation behavior of chitosan and its nanocomposites. The conductivity of chitosan/Ag nanocomposites was considered with respect to the frequency. Contact angle measurements were used to characterize the surface twistability, surface cleanliness, and hydrophilic/hydrophobic nature of the surface.

10aChitosan10aconductivity10acontact angle10arelaxation10asilver nanoparticles1 aRana, V., K.1 aPandey, Asutosh, K.1 aSingh, Raj, Pal1 aKumar, B.1 aMishra, Satyendra1 aHa, Chang-Sik uhttps://library.ncl.res.in/content/enhancement-thermal-stability-and-phase-relaxation-behavior-chitosan-dissolved-aqueous-l-001761nas a2200241 4500008004100000022001400041245007100055210006900126260005700195300001000252490000700262520094200269653003301211653001801244653001701262653002801279653001501307653002401322100002501346700002301371700002001394856010501414 2010 eng d a0170-083900aNovel addition-fragmentation agent in cationic photopolymerization0 aNovel additionfragmentation agent in cationic photopolymerizatio a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcJUN a25-340 v653 a

The aim of present study is to examine the photo-initiation efficiency of N,N-dimethylacrylamide-based allylic ammonium salt as one component addition-fragmentation agent (cationic photoinitiator cum radical source) in free radical accelerated cationic polymerization. Novel addition-fragmentation agent (AFA), 2-(N,N-dimethylcarboxy-3-propenyl)(phenylcarbonyl-4-phenylene) dimethyl ammonium hexafluoroantimonate (DMPDA) was synthesized as cationic photoinitiator and its initiation efficiency was examined in polymerization of cyclohexene oxide (CHO), isobutyl vinyl ether (IBVE), and n-butyl vinyl ether (n-BVE) in CH(2)Cl(2) solvent at wavelength lambda > 290 nm. The rate of polymerization increases with the increase in initiator concentration and reaction time. The results demonstrate that DMPDA acts as an efficient photoinitiator (AFA) without use of radical source in free radical accelerated cationic polymerization.

10aAddition-fragmentation agent10aAmmonium salt10aBenzophenone10aCationic polymerization10aOnium salt10aPhotopolymerization1 aGupta, Mukesh, Kumar1 aMehare, Rupali, S.1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/novel-addition-fragmentation-agent-cationic-photopolymerization-002137nas a2200253 4500008004100000022001400041245012900055210006900184260005700253300001400310490000700324520121300331653001501544653001401559653001901573653001801592653001801610653002201628100003101650700002801681700002601709700002001735856012801755 2010 eng d a1598-503200aPreparation and characterization of bioceramic nanocomposites based on hydroxyapatite (HA) and carboxymethyl cellulose (CMC)0 aPreparation and characterization of bioceramic nanocomposites ba a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcDEC a1160-11670 v183 a

We report the synthesis of biomimetic nanocomposites based on carboxymethyl cellulose (CMC) and hydroxyapatite (HA) nanoparticles via a co-precipitation method. Physico-chemical characterization was performed before and after calcination by Fourier transform infrared (FTIR) spectroscopy, solid state (31)P nuclear magnetic resonance (NMR) spectroscopy, and thermogravimetric analysis (TGA). The formation of nanocomposites was observed by wide angle X-ray diffraction (WAXD), scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX), and transmission electron microscopy (TEM). The spectral and crystallographic data indicated the formation of hydroxyapatite in the presence of CMC. They were observed as aggregates of HA nanoparticles and CMC, whose sizes were approximately similar to 260 +/- 40 nm. The crystallite size of the hydroxyapatite particles decreased (with 2 wt% 18 +/- 3 nm) with increasing CMC content. The morphological aspects of the calcined samples revealed the sintering ability of HA nanoparticles. Nanocomposites of hydroxyapatite nanoparticles that mimic the process of nucleation and growth in nature can be prepared using biomacromolecules such as CMC.

10abiopolymer10acellulose10ahydroxyapatite10aNanoparticles10aParticle size10aX-ray diffraction1 aKumar, Annamalai, Pratheep1 aMohaideen, Kamal, Khaja1 aAlariqi, Sameh, A. S.1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/preparation-and-characterization-bioceramic-nanocomposites-based-hydroxyapatite-ha-and-002253nas a2200217 4500008004100000022001400041245014200055210006900197260006800266300001400334490000800348520139100356653003201747653002401779653001301803653002601816653003001842100001701872700002001889856012601909 2010 eng d a0021-899500aPreparation and characterization of novel hybrid of bio-assisted mineralized Zn-Al layered double hydroxides using chitosan as a template0 aPreparation and characterization of novel hybrid of bioassisted  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcMAR a3636-36440 v1153 a

The purpose of this study was to prepare and characterize a novel nanohybrid prepared from the template-assisted mineralization of Zn-Al Layered Double Hydroxide (LDH) onto the surface of Chitosan (CSI), with an emphasis on morphology, biocompatibitity, and its use as an efficient drug carrier agent. The as prepared LDH is highly crystalline, with platelet-like morphology and curved tactoids when nucleated onto the surface of CSI. Our results indicate that the -OH and -NH functional moieties on CSI can direct an ordered structure of LDH, due to the electrostatic interaction between biopolymer and inorganic lamellae. We have been successful to intercalate an anti-inflammatory drug, Sodium Ibuprofen (Ibu), into LDH, through conventional coprecipitation method. LDHs are endowed with great potential for delivery vector because their stacked layers lead to safe reservation of biofunctional molecules or genes, and their ion exchangeability and solubility in acidic media (pH < 4) give rise to the controlled release of drug molecules. According to the cell-growth studies, LDHs are found as cell viable up to the concentration of 500 mu g/mL. This study reveals that LDH not only plays a role of a biocompatible-delivery matrix but also facilitates a significant increase in the delivery efficiency. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 115:3636-3644,2010

10abio-assisted mineralization10acell-growth studies10aChitosan10adrug delivery systems10alayered double hydroxides1 aDepan, Dilip1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/preparation-and-characterization-novel-hybrid-bio-assisted-mineralized-zn-al-layered-001892nas a2200229 4500008004100000022001400041245013700055210006900192260009600261300001000357490000800367520100900375653001301384653002601397653001401423653002201437653001501459100001701474700001901491700002001510856013201530 2010 eng d a1022-136000aUltrasound-triggered release of ibuprofen from a chitosan-mesoporous silica composite - a novel approach for controlled drug release0 aUltrasoundtriggered release of ibuprofen from a chitosanmesoporo aPO BOX 10 11 61, D-69451 WEINHEIM, GERMANYbInt Union Pure & Appl Chem; German Res FdncJAN a80-880 v2873 a

In this work, an attempt was made to synthesize a novel Chitosan-Mesoporous silica (CS-MS) hybrid composite to design a drug delivery system based on ultrasound triggered stimuli-responsive smart release. The in-vitro drug release properties of both the Mesoporous Silica (MS) and Chitosan (CS) hybrids were investigated. Ibuprofen (Ibu) was used as a model drug. The results from powder X-Ray diffraction (XRD) patterns, and BET N(2) adsorption isotherms exhibited that MS can accommodate drug molecules into the lumen of the channels and pores. Drug release, stimulated by temperature and pH of the release media was also investigated. We studied the Ultrasound (US) triggered release of Ibu in a simulated body fluid (pH 7.4). The results exhibited that US can be used as a non-invasive technique for drug release from polymeric materials. The enhancing effect of ultrasound on drug release is due to the Cavitation effect, without causing any significant destruction on the polymer morphology.

10aChitosan10adrug delivery systems10aibuprofen10aMesoporous silica10aUltrasound1 aDepan, Dilip1 aSaikia, Lakshi1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/ultrasound-triggered-release-ibuprofen-chitosan-mesoporous-silica-composite-novel-approach-002017nas a2200229 4500008004100000022001400041245013900055210006900194260011000263300001400373490000600387520110100393100002301494700002001517700002701537700001601564700001701580700002201597700002001619700001801639856013001657 2011 eng d a2040-250300aHierarchical mesoporous bio-polymer/silica composites co-templated by trimethyl chitosan and a surfactant for controlled drug delivery0 aHierarchical mesoporous biopolymersilica composites cotemplated  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcDEC a1162-11660 v23 a

In this communication, we report the facile synthesis of hierarchical mesoporous bio-polymer/silica composite materials with bimodal mesopores using a dual-template of the cationic N,N,N-trimethyl chitosan (TMCs) and the anionic sodium dodecyl sulfate (SDS) via one-step synthetic strategy. Tetraethoxysilane (TEOS) was used as a silica source. The nitrogen adsorption/desorption measurements and transmission electron microscopy analysis showed the hierarchical structure of the mesoporous bio-polymer/silica composites with bimodal mesopores having an average pore size of 5-7 nm with the visible voids between the silica nanoparticles, which allow the mesoporous bio-polymer/silica composites to encapsulate a large number of guest drug molecules, Ibuprofen (IBU) or 5-fluorouracil (5-FU), due to their high surface area and pore volume. In addition, the mesoporous chitosan-silica composites also had a long term biocompatibility for the target release of the drug molecules to the CEM cells, MCF cells, etc. as well as a pH sensitive controlled release behavior of the drug molecules.

1 aRana, Vijay, Kumar1 aPark, Sung, Soo1 aParambadath, Surendran1 aKim, Mi, Ju1 aKim, Sun-Hee1 aMishra, Satyendra1 aSingh, Raj, Pal1 aHa, Chang-Sik uhttps://library.ncl.res.in/content/hierarchical-mesoporous-bio-polymersilica-composites-co-templated-trimethyl-chitosan-and-002507nas a2200265 4500008004100000022001400041245010100055210006900156260007600225300001400301490000700315520155300322653002201875653003001897653001901927653001801946653001301964653003201977100002202009700002202031700002002053700002402073700002002097856012402117 2011 eng d a0959-810300aInfluence of reactive compatibilization on the structure and properties of PP/LDH nanocomposites0 aInfluence of reactive compatibilization on the structure and pro aCOMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USAbWILEY-BLACKWELLcDEC a1688-16960 v603 a

Polypropylene (PP)/layered double hydroxide (LDH) nanocomposites were prepared by the direct melt intercalation method usingmaleic anhydride grafted polypropylene (PP-g-MAH) as a reactive compatibilizer. The compatibilization effects provided by PP-g-MAH in different weight fractions and their influence on the structure and properties of the final nanocomposites were investigated. The interactions and structural morphology of the nanocomposites were examined by Fourier transform infrared spectroscopy, X-ray diffraction and transmission electronmicroscopy. Thermal, mechanical and rheological properties of these nanocomposites were investigated as a function of compatibilizer concentration. The detailed morphological and X-ray diffraction results revealed that the degree of LDH dispersion increases as the amount of PP-g-MAH increases. Study of the linear viscoelastic properties showed that the storage modulus G' is very sensitive to the microstructure of the nanocomposite. The thermal properties of the nanocomposites were significantly influenced by the weight fraction of PP-g-MAH due to the shielding and nucleating effect of exfoliated layers. Both the tensile strength and modulus showed substantial improvements with increasing PP-g-MAH content, while the elongation at break substantially decreased, although the presence of PP-gMAH somewhat improves these values. The overall results showed that 10 wt% of compatibilizer is optimum to achieve nanocomposites with better performance. (C) 2011 Society of Chemical Industry

10acompatibilization10alayered double hydroxides10aNanocomposites10apolypropylene10aRheology10athermomechanical properties1 aLonkar, Sunil, P.1 aTherias, Sandrine1 aLeroux, Fabrice1 aGardette, Jean, Luc1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/influence-reactive-compatibilization-structure-and-properties-ppldh-nanocomposites-001748nas a2200301 4500008004100000022001400041245010100055210006900156260007700225300001200302490000800314520070400322653002101026653001301047653002601060653003401086653002401120100002301144700002201167700001901189700002101208700001601229700001701245700002201262700002001284700001801304856012401322 2011 eng d a1438-749200aSynthesis and drug-delivery behavior of chitosan-functionalized graphene oxide hybrid nanosheets0 aSynthesis and drugdelivery behavior of chitosanfunctionalized gr aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcFEB a131-1400 v2963 a

Chitosan-functionalized graphene oxides (FGOCs) were successfully synthesized. FGOCs were found to significantly improve the solubility of the GO in aqueous acidic media. The presence of organic groups was confirmed by means of XPS and TGA. Restoration of the sp(2) carbon network and exfoliation of graphene sheets were confirmed by Raman spectroscopy, UV-visible spectroscopy and WAXD. The SEM and AFM investigations of the resultant FGOCs showed that most of the graphene sheets were individual and few were layered. Controlled release behavior of Ibuprofen and 5-fluorouracil was then investigated. We found that FGOCs are a promising new material for biological and medical applications.

10aBiocompatibility10aChitosan10adrug delivery systems10afunctionalization of polymers10asolution properties1 aRana, Vijay, Kumar1 aChoi, Myeon-Cheon1 aKong, Jin-Yeon1 aKim, Gwang, Yeon1 aKim, Mi, Ju1 aKim, Sun-Hee1 aMishra, Satyendra1 aSingh, Raj, Pal1 aHa, Chang-Sik uhttps://library.ncl.res.in/content/synthesis-and-drug-delivery-behavior-chitosan-functionalized-graphene-oxide-hybrid-002006nas a2200217 4500008004100000022001400041245011000055210006900165260007300234300001200307490000700319520118700326653001301513653002501526653002701551653002001578653001801598100002101616700002001637856013101657 2012 eng d a0141-813000aGlycolic acid-g-chitosan-gold nanoflower nanocomposite scaffolds for drug delivery and tissue engineering0 aGlycolic acidgchitosangold nanoflower nanocomposite scaffolds fo aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR a878-8830 v503 a

This paper reports a simple novel method for the synthesis of flower like gold nanoparticle (three dimensional branched nanoparticle) with >30 tips, under controlled temperature condition. Formation of flower like Au nanoparticle was confirmed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Next step of this paper reveals the potential use of novel hybrids of chitosan-g-glycolic acid and gold nanoflower (AuNF) in controlled drug delivery and tissue engineering applications. The drug loaded novel nanohybrid scaffold is prepared by freeze drying of grafted polymer solution. Grafting of glycolic acid to the chitosan and incorporation of drug were evaluated by Fourier transform infrared spectroscopy (FTIR). The nanohybrid scaffolds were found to be stable towards the pH of the medium. The cell viability study shows that prepared nanohybrid scaffolds are biocompatible. Gold nanoflowers were found to control the drug release rate in the buffer solution (pH 7.4). Therefore, for the glycolic acid grafted chitosan based system, gold nanoflowers are the viable additive for drug delivery. (C) 2011 Elsevier B.V. All rights reserved.

10aChitosan10aDrug delivery system10aGlycolic acid grafting10aGold nanoflower10aNanocomposite1 aKumari, Sangeeta1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/glycolic-acid-g-chitosan-gold-nanoflower-nanocomposite-scaffolds-drug-delivery-and-tissue-002030nas a2200217 4500008004100000022001400041245011300055210006900168260007300237300001000310490000700320520120200327653001901529653001301548653001801561653002701579653003301606100002101639700002001660856013201680 2012 eng d a0141-813000aGlycolic acid-g-chitosan-Pt-Fe3O4 nanoparticles nanohybrid scaffold for tissue engineering and drug delivery0 aGlycolic acidgchitosanPtFe3O4 nanoparticles nanohybrid scaffold  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUL a76-820 v513 a

This work presents the potential use of novel nanohybrid based on chitosan-g-glycolic acid and Pt-Fe3O4 composite nanoparticles in drug delivery and tissue engineering applications. The Pt-Fe3O4 hybrid nanoparticles are prepared by thermal decomposition of H2PtCl6 center dot 6H(2)O at high temperature. The prepared nanoparticles were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and physical property measurement system (PPMS). Next step of this paper reveals the potential use of novel hybrids of chitosan-g-glycolic acid and Pt-Fe3O4 hybrid nanoparticles in controlled drug delivery applications. The drug loaded nanohybrid scaffold is prepared by freeze drying of grafted polymer solution. Drug loading and grafting of chitosan was characterized by Fourier transform infrared spectroscopy (FTIR). The cell proliferation also shows that the prepared nanohybrids are biocompatible. The nanohybrid was found to be stable regardless of pH of the medium. Therefore, Pt-Fe3O4 hybrid nanoparticles are viable additive for sustained drug delivery and it could be applied in the field of biomedical. (c) 2012 Elsevier B.V. All rights reserved.

10aCell viability10aChitosan10adrug delivery10aGlycolic acid grafting10aPt-Fe3O4 hybrid nanoparticle1 aKumari, Sangeeta1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/glycolic-acid-g-chitosan-pt-fe3o4-nanoparticles-nanohybrid-scaffold-tissue-engineering-and-001803nas a2200277 4500008004100000022001400041245013100055210006900186260009500255300001200350490000800362520076400370653002601134653002301160653001301183653004301196100002301239700001701262700002701279700001901306700002001325700002201345700002001367700001801387856012001405 2012 eng d a0022-459600aHeterocyclic tri-urea isocyanurate bridged groups modified periodic mesoporous organosilica synthesized for Fe(III) adsorption0 aHeterocyclic triurea isocyanurate bridged groups modified period a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcOCT a392-3990 v1943 a

To achieve a high level of heavy metal adsorption, 1,1',1 `'-(1,3,5-triazine-2,4,6-triyl)tris(3-(3-(triethoxysilyl) propyl)urea) (TTPU) was synthesized as a novel melamine precursor and incorporated on the silica surface of periodic mesoporous organosilica (PMO). The melamine modified PMOs (MPMOs) were synthesized under acidic conditions using TTPU, tetraethylorthosilicate (TEOS) and Pluronic P123 as a template and the modified PMOs were characterized using the relevant instrumental techniques. The characteristic materials were used as adsorbents for the adsorption of Fe(III) ions. Fe(III) adsorption studies revealed MPMO-7.5 to be a good absorbent with higher adsorption efficiency than other MPMOs. (C) 2012 Elsevier Inc. All rights reserved.

10aAdsorption efficiency10aFe(III) adsorption10aMelamine10aPeriodic mesoporous organosilica (PMO)1 aRana, Vijay, Kumar1 aSelvaraj, M.1 aParambadath, Surendran1 aChu, Sang-Wook1 aPark, Sung, Soo1 aMishra, Satyendra1 aSingh, Raj, Pal1 aHa, Chang-Sik uhttps://library.ncl.res.in/content/heterocyclic-tri-urea-isocyanurate-bridged-groups-modified-periodic-mesoporous-002070nas a2200193 4500008004100000022001400041245011500055210006900170260006700239300001400306490000700320520131000327100002201637700002201659700002001681700002401701700002001725856013101745 2012 eng d a0032-388800aThermal, mechanical, and rheological characterization of polypropylene/layered double hydroxide nanocomposites0 aThermal mechanical and rheological characterization of polypropy a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcSEP a2006-20140 v523 a

Polypropylene (PP)/organomodified layered double hydroxide (LDH) nanocomposites were prepared in order to examine the influence of LDH content on thermal, mechanical, and rheological properties. The nanostructure examinations by X-ray diffraction (XRD) and transmission electron microscopy (TEM) confirmed the exfoliated/intercalated dispersion of LDH. Incorporation of the LDH resulted in a noteworthy improvement in the thermal stability of PP. It was shown that the addition of LDH contributed to the reinforcement effect by increasing the elastic modulus. The mechanical performance, as evaluated by stressstrain curves, reveal that PP/LDH hybrid materials showed significant contribution toward increment in elastic modulus, tensile strength but at the expense of impact strength. The rheological response showed a strong influence of LDH particles on the flow behavior of the PP/LDH melt which resulted in enhancement of storage, loss of moduli, and complex viscosity of nanocomposites. Therefore, the nanocomposites have higher moduli but better processibility compared with pure PP. Overall, the results indicated that the LDH particles in nanometer size might act as potential reinforcing agent for polypropylene. POLYM. ENG. SCI., 52:20062014, 2012. (c) 2012 Society of Plastics Engineers

1 aLonkar, Sunil, P.1 aTherias, Sandrine1 aLeroux, Fabrice1 aGardette, Jean, Luc1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/thermal-mechanical-and-rheological-characterization-polypropylenelayered-double-hydroxide-002162nas a2200205 4500008004100000022001400041245011500055210006900170260007300239300001200312490000700324520132300331653003401654653003601688653002501724653004101749100002101790700002001811856012501831 2013 eng d a0141-813000aGlycolic acid functionalized chitosan-Au-Fe3O4 hybrid nanoparticle based nanohybrid scaffold for drug delivery0 aGlycolic acid functionalized chitosanAuFe3O4 hybrid nanoparticle aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR a244-2490 v543 a

The research on biomedical applications of nanoparticles has seen an upsurge in recent years due to their unique capabilities in treatment of ailments. The present paper reports the synthesis of Au-Fe3O4 hybrid nanoparticles. The formation of these nanoparticles was confirmed by transmission electron microscopy (TEM) and physical property measurement system (PPMS). Next step of this paper reveals potential use of novel hybrid of chitosan-g-glycolic acid and Au-Fe3O4 hybrid nanoparticles in controlled drug delivery and tissue engineering applications. Grafting of glycolic acid and drug loading in porous scaffold was characterized by Fourier transform infrared spectroscopy. The nanohybrid scaffolds were found to be stable regardless of pH of the medium and play a key role in cell adhesion, proliferation and migration. Au-Fe3O4 hybrid nanoparticles reinforcement was found to control the drug (cyclophosphamide) release rate in phosphate buffer saline solution (pH 7.4). Therefore, Au-Fe3O4 hybrid nanoparticles are viable additive for formulating sustained drug delivery systems based on glycolic acid grafted chitosan. The cell proliferation profile also shows that prepared nanohybrid is biocompatible providing suitable substrates for tissue engineering. (C) 2012 Elsevier B.V. All rights reserved.

10aAu-Fe3O4 hybrid nanoparticles10aChitosan Glycolic acid grafting10aDrug delivery system10aPhysical property measurement system1 aKumari, Sangeeta1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/glycolic-acid-functionalized-chitosan-au-fe3o4-hybrid-nanoparticle-based-nanohybrid-001757nas a2200157 4500008004100000022001400041245015200055210006900207260005700276300001400333490000700347520107700354100002101431700002001452856012701472 2013 eng d a0022-246100aGlycolic acid-functionalized chitosan-Co3O4-Fe3O4 hybrid magnetic nanoparticles-based nanohybrid scaffolds for drug-delivery and tissue engineering0 aGlycolic acidfunctionalized chitosanCo3O4Fe3O4 hybrid magnetic n a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcFEB a1524-15320 v483 a

In the present work, Co3O4 was prepared by hydrothermal process, which is further used for the synthesis of Co3O4-Fe3O4 hybrid nanoparticles. The formation of Co3O4-Fe3O4 nanoparticles was investigated by transmission electron microscopy and physical property measurement system. In the next step, the drug-loaded novel nanohybrid porous scaffold based on chitosan-g-glycolic acid and Co3O4-Fe3O4 nanoparticle was prepared by freeze drying technique. The grafting of glycolic acid on chitosan drug loading in porous scaffold was characterized by Fourier transform infrared spectroscopy. The nanohybrid scaffolds were found to be stable regardless of the pH of the medium and play an important role in cell adhesion, proliferation, and migration. Co3O4-Fe3O4 hybrid nanoparticles' reinforcement was found to control the drug (cyclophosphamide) release rate in phosphate buffer saline solution (pH 7.4). Therefore, Co3O4-Fe3O4 hybrid nanoparticles are viable additives for formulating sustained drug delivery systems and could be applied in the field of biomaterials.

1 aKumari, Sangeeta1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/glycolic-acid-functionalized-chitosan-co3o4-fe3o4-hybrid-magnetic-nanoparticles-based-002051nas a2200265 4500008004100000022001400041245012200055210006900177260009200246300001400338490000700352520107800359653002101437653001301458653001101471653003101482653001901513100002301532700001901555700002401574700002201598700002001620700001801640856012701658 2014 eng d a1533-488000aChitosan and chitosan-co-poly(epsilon-caprolactone) grafted multiwalled carbon nanotube transducers for vapor sensing0 aChitosan and chitosancopolyepsiloncaprolactone grafted multiwall a26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USAbAMER SCIENTIFIC PUBLISHERScMAR a2425-24350 v143 a

Vapor sensitive transducer films consisting of chitosan grafted (CNT-CS) and chitosan-co-polycaprolactone grafted (CNT-CS-PCL) multiwalled carbon nanotubes were prepared using a spray layer-by-layer technique. The synthesized materials (CNT-CS and CNT-CS-PCL) were characterized by Fourier transform infrared spectroscopy, C-13 CP/MAS solid state nuclear magnetic resonance spectroscopy and thermogravimetric analysis. Both CNT-CS and CNT-CS-PCL transducers were analyzed for the response of volatile organic compounds and toluene vapors. The ranking of the relative resistance (A(r)) for both chitosan based transducers were as follows: toluene < chloroform < ethanol < methanol. The CNT transducer (CNT-CS) was correlated selectively with an exponential law to the inverse of Flory-Huggins interaction parameters, chi(12). Dosing the films on the interdigitated electrodes with methanol, ethanol, chloroform and toluene vapors increased the film resistance of CNT-CS but decreased the resistance of CNT-CS-PCL compared to that of the reported transducers.

10aBiocompatibility10aChitosan10aMWCNTs10aPoly(epsilon-caprolactone)10aVapour Sensing1 aRana, Vijay, Kumar1 aAkhtar, Shamim1 aChatterjee, Sudipta1 aMishra, Satyendra1 aSingh, Raj, Pal1 aHa, Chang-Sik uhttps://library.ncl.res.in/content/chitosan-and-chitosan-co-polyepsilon-caprolactone-grafted-multiwalled-carbon-nanotube-002735nas a2200169 4500008004100000245012100041210007000162260000800232300001400240490000600254520207300260100002602333700002802359700002802387700002002415856013002435 2017 eng d00aStabilization of γ-sterilized low-density polyethylene by synergistic mixtures of food-contact approval stabilizers0 aStabilization of γsterilized lowdensity polyethylene by synergis cJUN a145–1560 v83 aIn our previous studies, we have found the synergistic combinations of stabilizers which follow different mechanisms of stabilization and are approved for food contact applications. The present attempt is to test the potentials of those systems in stabilizing γ-sterilized low-density polyethylene (LDPE). The results were discussed by comparing the stabilizing efficiency of mixtures with and without phenol systems as well as with their counterparts of isotactic polypropylene (iPP) and ethylene-propylene copolymers (EP) matrices. LDPE has been melt-mixed with tertiary hindered amine stabilizer (tert-HAS), oligomeric HAS stabilizer, phenolic and organo-phosphite antioxidants and subjected to γ-sterilization. Stabilization in terms of changes in oxidation products, tensile properties, yellowing and surface morphology was evaluated by FT-IR spectroscopy, Instron, colorimetry, and scanning electron microscopy (SEM), respectively. The results of the present study confirm the validity of those systems for protecting various polyolefins against γ-sterilization. The results showed that the synergism, antagonism and the trend in stabilization efficiency of the binary, ternary and quaternary stabilizer systems were almost similar in LDPE, iPP and EP matrices. The binary system of oligomeric HAS and tert-HAS has shown the antagonistic effect of stabilization, whereas their combination with organo-phosphite has exhibited synergistic effect even at higher doses of γ-sterilization. The combination of oligomeric HAS, tert-HAS, organo-phosphite and hindered phenol exhibited improved stabilization efficiency than single or binary additive systems. The phenol systems have shown long term of stability than that of phenol-free systems. It was found that the consumption of oligomeric stabilizer significantly depends on the components of stabilization mixture. It was concluded that the stability of polyolefins (LDPE, iPP and EP) against γ-sterilization can be achieved by blends of different stabilizers which are approved for food contact applications.1 aAlariqi, Sameh, A. S.1 aAl-Areqi, Niyazi, A. S.1 aAlaghbari, Elyas, Sadeq1 aSingh, Raj, Pal uhttps://library.ncl.res.in/content/stabilization-%CE%B3-sterilized-low-density-polyethylene-synergistic-mixtures-food-contact01618nas a2200181 4500008004100000022001400041245006400055210006300119260000900182300001200191490000600203520104000209100002101249700002001270700002301290700002801313856009501341 2018 eng d a2045-985800aChitosan-based bionanocomposites for biomedical application0 aChitosanbased bionanocomposites for biomedical application cDEC  a219-2270 v73 aNatural polymers have greatly impacted the advancement of modern medicine. Natural polymer-based biomaterials are biodegradable. A significant advantage of natural polymers is that they can be broken down and removed from the body after they have served their function. A wide range of novel biomaterials from natural polymers has been investigated to meet new challenges in medical science. Chitosan is one of the natural polymers which have been widely used in the biomedical field. Nanotechnology is one of the most popular areas of current research. In the area of nanotechnology, polymer and metal/metal oxide nanoparticle matrix-based nanocomposites have generated a significant amount of attention in the recent literature. These bionanocomposites have wide-ranging applications in drug delivery and tissue engineering. This paper discusses polymer-metal/metal oxide nanoparticle matrix-based nanocomposite biomaterials and their applications in the biomedical field - that is, drug delivery and tissue engineering applications.1 aKumari, Sangeeta1 aSingh, Raj, Pal1 aChavan, Nayaku, N.1 aAnnamalai, Pratheep, K. uhttps://library.ncl.res.in/content/chitosan-based-bionanocomposites-biomedical-application02087nas a2200241 4500008004100000245011400041210006900155260000800224300000900232490000700241520123200248653001301480653002401493653003401517653002901551653003101580100002101611700002001632700002301652700002401675700001901699856012701718 2021 eng d00aCharacterization of a novel nanocomposite film based on functionalized chitosan-Pt-Fe3O4 hybrid nanoparticles0 aCharacterization of a novel nanocomposite film based on function cMAY a12750 v113 a

The development of organic-inorganic hybrids or nanocomposite films is increasingly becoming attractive in light of their emerging applications. This research focuses on the formation of a unique nanocomposite film with enhanced elasticity suitable for many biomedical applications. The physical property measurement system and transmission electron microscopy were used to analyze Pt-Fe3O4 hybrid nanoparticles. These nanohybrids exhibited magnetic effects. They were further exploited to prepare the nanocomposite films in conjunction with a chitosan-g-glycolic acid organic fraction. The nanocomposite films were then examined using standard techniques: thermogravimetric analysis, X-ray diffraction, Fourier transform infrared spectroscopy, and atomic force microscopy. Tensile strength testing demonstrated a significantly greater elastic strength of these nanocomposite films than pure chitosan films. The water absorption behavior of the nanocomposites was evaluated by measuring swelling degree. These nanocomposites were observed to have substantially improved physical properties. Such novel nanocomposites can be extended to various biomedical applications, which include drug delivery and tissue engineering.

10aChitosan10ananocomposite films10aPt-Fe3O4 hybrid nanoparticles10atensile strength testing10aThermogravimetric analysis1 aKumari, Sangeeta1 aSingh, Raj, Pal1 aChavan, Nayaku, N.1 aSahi, Shivendra, V.1 aSharma, Nilesh uhttps://library.ncl.res.in/content/characterization-novel-nanocomposite-film-based-functionalized-chitosan-pt-fe3o4-hybrid