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<p>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.</p>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-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<p>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 &gt; 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 &amp; Sons, Ltd.</p>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-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<p>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.</p>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-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<p>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.</p>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<p>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 &lt; 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</p>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-0