01648nas a2200253 4500008004100000245010500041210006900146260010900215300001400324490000600338520068500344653002301029653001401052653002201066100003001088700001501118700002101133700002601154700001901180700001901199700002501218700002001243856013101263 2005 eng d00aNovel method for the synthesis of siloxane nanowires and filaments using gold nanoparticle catalysts0 aNovel method for the synthesis of siloxane nanowires and filamen a Calcutta, IndiabWorld Scientific Publ Co Pte Ltd, Po Box 128 Farrer Rd, Singapore 9128, SingaporecDEC a1007-10100 v43 a

A unique polymerization reaction of alkylsilanes to siloxane nanowires, filaments and tubes in presence of gold nanoparticles and water is presented. The gold nanoparticles, which catalyze this reaction also work as templates restricting the shape of the resulting polymers into wires and tubes. High resolution transmission electron microscopy images clearly reveal the presence of gold nanoparticle at the tip of each wire supporting the template hypothesis. Elemental analyses by different methods confirm the stoichiometry to be C18H37SiO1.5, when the alkylsilane used was C18H37SiH3, thus proving that the alkyl group remains intact during the polymerization reaction.

10agold nanoparticles10aNanowires10asiloxane polymers1 aPrasad, Bhagavatula L. V.1 aStoeva, S.1 aSorensen, C., M.1 aKlabunde, Kenneth, J.1 aZaikovskii, V.1 aSanyal, M., K.1 aRaychaudhuri, A., K.1 aChakravorty, D. uhttps://library.ncl.res.in/content/novel-method-synthesis-siloxane-nanowires-and-filaments-using-gold-nanoparticle-catalysts-001831nas a2200229 4500008004100000022001400041245006500055210006500120260009500185300001400280490000600294520104900300653001701349653001701366653002301383100002101406700002101427700001401448700002101462700001901483856009901502 2007 eng d a1533-488000aBacterial enzyme mediated biosynthesis of gold nanoparticles0 aBacterial enzyme mediated biosynthesis of gold nanoparticles a25650 NORTH LEWIS WAY, STEVENSON RANCH, CA 91381-1439 USAbAMER SCIENTIFIC PUBLISHERScDEC a4369-43770 v73 a

Development of synthesis methods for anisotropic metal nanoparticles is of considerable interest due to their remarkable optoelectronic properties. Various shapes ranging from rods to cubes to tetrapods and prisms may be obtained by chemical methods. Here we show that anisotropic gold nanoparticles can be synthesized biologically by the bacterium Actinobacter spp. when challenged with gold chloride in the presence of Bovine serum albumin (BSA). We also observed that synthesis of gold nanoparticles occur with simultaneous induction of the protease enzyme secreted by the bacterium in the presence of BSA. The presence of BSA helps to enhance the rate of gold nanoparticles biosynthesis and may also impart some shape control. Controlling simple experimental conditions like incubation temperature and presence or absence of oxygen have drastic effect on the reaction rate and the morphology of the particles. Various assay experiments show that the presence of enzyme protease can act as a reducing as well as shape directing agent.

10aBiosynthesis10abovine serum10agold nanoparticles1 aBharde, Atul, A.1 aKulkarni, Aarohi1 aRao, Mala1 aPrabhune, Asmita1 aSastry, Murali uhttps://library.ncl.res.in/content/bacterial-enzyme-mediated-biosynthesis-gold-nanoparticles-002071nas a2200265 4500008004100000022001400041245011900055210006900174260009500243300001200338490000600350520109400356653001901450653001301469653002301482653002301505653001601528100002201544700001801566700002001584700001701604700002701621700003001648856012701678 2009 eng d a1550-703300aAcute and subacute toxicity studies of chitosan reduced gold nanoparticles: a novel carrier for therapeutic agents0 aAcute and subacute toxicity studies of chitosan reduced gold nan a25650 NORTH LEWIS WAY, STEVENSON RANCH, CA 91381-1439 USAbAMER SCIENTIFIC PUBLISHERScJUN a233-2390 v53 a

The objective of the present study was to evaluate the oral toxicity of chitosan reduced gold nanoparticles so as to demonstrate its applicability for drug delivery application. Acute oral toxicity studies in female rats documented no deaths or treatment related complications. The LD(50) value of gold nanoparticles was found to be greater than 2000 mg/kg. In case of sub-acute oral toxicity studies, gold nanoparticles were administered orally to male and female rats for a period of 28-days. At the end of study blood samples were collected for haematology and biochemical analysis. For histopathological analysis, organs of animals were weighed and processed for examination. All animals survived the duration of the study, with no significant changes in clinical signs, body weight, food consumption, hematological parameters, organ weights and histopathological findings. These studies establish that chitosan reduced gold nanoparticles produced no treatment related toxicity in rats following oral administration, thus can be exploited for potential therapeutic applications.

10aAcute Toxicity10aChitosan10agold nanoparticles10aSub-Acute Toxicity10aWistar Rats1 aPokharkar, Varsha1 aDhar, Sheetal1 aBhumkar, Devika1 aMali, Vishal1 aBodhankar, Subhash, L.1 aPrasad, Bhagavatula L. V. uhttps://library.ncl.res.in/content/acute-and-subacute-toxicity-studies-chitosan-reduced-gold-nanoparticles-novel-carrier-001779nas a2200253 4500008004100000022001400041245013200055210006900187260007300256300001000329490000800339520080200347653002301149653002901172653003301201653002101234653001901255653002701274100002301301700002801324700001501352700003001367856012801397 2009 eng d a0927-775700aOptical limiting properties of hydrophobic poly(etherimide) membranes embedded with isolated and aggregated gold nanostructures0 aOptical limiting properties of hydrophobic polyetherimide membra aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC a79-830 v3523 a

A simple method to incorporate spherical or aggregated nanostructures of gold into hydrophobic poly(etherimide) membranes is demonstrated and their comparative nonlinear optical properties are investigated. When excited at 532 nm using laser pulses of 7 ns duration, a reduced transmission behaviour in both the cases, viz., polymers embedded with isolated nanoparticles and their aggregates is observed. This fits to a three-photon type nonlinear absorption process and is attributed to excited state absorption occurring in the nanostructures. Interestingly, the nonlinearity is more prominent in the aggregated nanostructures compared to the spherical nanostructures. These materials are potential candidates for optical limiting applications. (C) 2009 Elsevier B.V. All rights reserved.

10agold nanoparticles10aNanoparticle aggregation10aNonlinear optical properties10aOptical limiting10aPhase transfer10aPolymer nanocomposites1 aD'Britto, Virginia1 aSandeep, C., S. Suchand1 aPhilip, R.1 aPrasad, Bhagavatula L. V. uhttps://library.ncl.res.in/content/optical-limiting-properties-hydrophobic-polyetherimide-membranes-embedded-isolated-and-002567nas a2200217 4500008004100000022001400041245014700055210006900202260009500271300001200366490000800378520168700386653002902073653002302102653003202125653001802157100001902175700001602194700001902210856012002229 2009 eng d a0021-979700aShape and size selective separation of gold nanoclusters by competitive complexation with octadecylamine monolayers at the air-water interface0 aShape and size selective separation of gold nanoclusters by comp a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcMAY a380-3880 v3333 a

The paper presents a time-dependent study of shape-dependent preferential complexation of gold nanoparticles to the octadecyl amine (ODA) monolayers at the air-water interface. Room temperature reduction of chloroaurate ions using lemon grass leaf extract yields a Mixture of spherical and triangular nanoparticles, which were used for this study. These nanoparticles have a net negative charge on their surface due to the presence of biomolecules from plant extract and thus a strong attractive electrostatic interaction with the positively charged ODA monolayers drives the complexation process. The extent of preferential complexation of the gold nanoparticles to the ODA monolayers is a function of the charge on the particles and the relative mobility of the nanoclusters in the medium. The complexation process has been followed in real time by a host of techniques such as surface pressure-area (pi-A) isotherms, UV-vis-NIR spectroscopy and Brewster angle microscopy. The charge and mobility of the gold nanoparticles was confirmed by measurement of their electrophoretic mobility. Langmuir-Blodgett films of the nanogold-ODA composites have been characterized by UV-vis-NIR spectroscopy, Fourier transform infrared spectroscopy, and transmission electron microscopy. These measurements clearly indicate that the cluster mobility and complexation increase with decreasing cluster size. In the competitive complexation process of large and small gold particles, it was observed that some bigger gold particles were also incorporated into the amine matrix even though the cluster mobility is higher for smaller gold particles. (c) 2009 Elsevier Inc. All rights reserved.

10aCompetitive complexation10agold nanoparticles10aLangmuir-Blodgett technique10aODA monolayer1 aPasricha, Renu1 aSingh, Amit1 aSastry, Murali uhttps://library.ncl.res.in/content/shape-and-size-selective-separation-gold-nanoclusters-competitive-complexation-002299nas a2200265 4500008004100000022001400041245010800055210006900163260007600232300001200308490000700320520135100327653001501678653002001693653001501713653002301728653002201751100001801773700001701791700002701808700001901835700003001854700002201884856012701906 2011 eng d a0260-437X00aBiocompatible gellan gum-reduced gold nanoparticles: cellular uptake and subacute oral toxicity studies0 aBiocompatible gellan gumreduced gold nanoparticles cellular upta aCOMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USAbWILEY-BLACKWELLcJUL a411-4200 v313 a

Currently gold nanoparticles are being explored for drug delivery and other biomedical applications; therefore it is necessary to study the fate of such nanoparticles inside the body. The objective of the present study was to investigate the cellular uptake and toxicity of the gold nanoparticles synthesized using a microbial polysaccharide, gellan gum, as a capping and reducing agent. The cellular uptake of gold nanoparticles was studied on mouse embryonic fibroblast cells, NIH3T3 and human glioma cell line, LN-229. The cellular uptake study indicated that the gellan gum-reduced gold nanoparticles were located in cancer cells (LN-229) while no uptake was observed in normal mouse embryonic fibroblast cells (NIH3T3). The toxicity of the gold nanoparticles was evaluated by carrying out subacute 28 day oral toxicity studies in rats. Subacute administration of gum-reduced gold nanoparticles to the rats did not show any hematological or biochemical abnormalities. The weight and normal architecture of various organs did not change compared with control. The current findings, while establishing the specific uptake of nanoparticles into cancerous cells, also demonstrates that the gellan gum-reduced gold nanoparticles are devoid of toxicity in animals following oral administration. Copyright (c) 2010 John Wiley & Sons, Ltd.

10acell lines10acellular uptake10aGellan gum10agold nanoparticles10asubacute toxicity1 aDhar, Sheetal1 aMali, Vishal1 aBodhankar, Subhash, L.1 aShiras, Anjali1 aPrasad, Bhagavatula L. V.1 aPokharkar, Varsha uhttps://library.ncl.res.in/content/biocompatible-gellan-gum-reduced-gold-nanoparticles-cellular-uptake-and-subacute-oral-001842nas a2200229 4500008004100000022001400041245009500055210006900150260008000219300001200299490000700311520103800318653001701356653002301373653001801396653001501414653000801429100001301437700002101450700001901471856012201490 2011 eng d a0931-189000aSynthesis of gold nanoparticles by various leaf fractions of Semecarpus anacardium L. tree0 aSynthesis of gold nanoparticles by various leaf fractions of Sem aTIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANYbSPRINGER HEIDELBERGcAPR a145-1510 v253 a

Gold nanoparticles (NPs) were synthesized using Semecarpus anacardium leaf extracts in water and the green biomass. Extract prepared at ambient condition by crushing the leaves in deionized water is identified as `green extract', and that by boiling the leaf pieces as `boiled extract'. The mass remaining after separating the `green extract' is identified as `green biomass'. These components triggered rapid reduction of Au(III) to Au (0) in HAuCl4 solution indicating the natural ability of the leaves of S. anacardium to synthesize NPs in ambient conditions. Green extract produced more NPs compared to the boiled extract suggesting denaturization of some of the useful factors due to boiling. NPs were quantified using UV and ICP-AES analysis. These were characterized using Transmission electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. TEM images of the particles formed with green extract, boiled extract and green biomass showed that the particles were of different shapes and sizes.

10aBiosynthesis10agold nanoparticles10aGreen extract10aSemecarpus10aTEM1 aRaju, D.1 aMehta, Urmil, J.1 aHazra, Sulekha uhttps://library.ncl.res.in/content/synthesis-gold-nanoparticles-various-leaf-fractions-semecarpus-anacardium-l-tree-002101nas a2200253 4500008004100000022001400041245024000055210006900295260009500364300001200459490000800471520100600479653002201485653002701507653002301534653001801557653002901575100002601604700002201630700001801652700001901670700002801689856013001717 2013 eng d a0021-951700aEpoxidation of styrene by t-butyl hydroperoxide over gold nanoparticles supported on Yb2O3: effect of gold deposition method, gold loading, and calcination temperature of the catalyst on its surface properties and catalytic performance0 aEpoxidation of styrene by tbutyl hydroperoxide over gold nanopar a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcAPR a217-2240 v3003 a

Surface properties and epoxidation performance of Au/Yb2O3 catalyst are influenced by the method of gold deposition [viz. deposition-precipitation (DP), homogeneous deposition-precipitation (HDP) or impregnation], gold loading (0.9-6.6 wt%), and the catalyst calcination temperature (400-900 degrees C)]. The catalyst showed the best epoxidation performance when it was prepared by the HDP method and calcined at 500 degrees C. The Au/Yb2O3 catalyst even after calcination at 900 degrees C showed good activity and epoxide selectivity. Both Au-0 and Au3+ surface species were found in the catalyst calcined at 800 degrees C, but only Au-0 species were observed at the lower calcination temperatures (<600 degrees C). The selectivity for styrene oxide increased continuously with the reaction temperature (from 75 degrees C to 97 degrees C) and time (1-5 h), indicating that styrene oxide did not undergo secondary reactions under these conditions. (C) 2013 Elsevier Inc. All rights reserved.

10aAu/Yb2O3 catalyst10aEpoxidation of styrene10agold nanoparticles10aStyrene oxide10atert-Butyl hydroperoxide1 aChoudhary, Vasant, R.1 aDumbre, Deepa, K.1 aPatil, N., S.1 aUphade, B., S.1 aBhargava, Suresh, Kumar uhttps://library.ncl.res.in/content/epoxidation-styrene-t-butyl-hydroperoxide-over-gold-nanoparticles-supported-yb2o3-effect-002302nas a2200241 4500008004100000022001400041245008900055210006900144260011100213300001200324490000600336520145700342653001701799653001101816653002301827653001501850653001101865653000801876100001301884700002101897700001701918856012501935 2013 eng d a1573-413700aExtra- and intracellular gold nanoparticles synthesis using live peanut callus cells0 aExtra and intracellular gold nanoparticles synthesis using live  aEXECUTIVE STE Y-2, PO BOX 7917, SAIF ZONE, 1200 BR SHARJAH, U ARAB EMIRATESbBENTHAM SCIENCE PUBL LTDcFEB a107-1120 v93 a

An important challenge of considerable topical significance in nanotechnology is the development of eco-friendly experimental processes for the synthesis of nanomaterials in large quantities with variable sizes, shapes and chemical compositions. Green synthesis routes for the production of inorganic metal nanoparticles using whole cell of microorganisms and plant extracts are gaining tremendous popularity as these are non-toxic, cheap and occur at ambient conditions. The present work emphasizes on gold nanoparticles synthesis protocol using live plant callus cells. Peanut callus cells when incubated with HAuCl4 solution in ambient conditions reduced the precursor and lead to formation of well dispersed, water soluble extracellular and intracellular gold nanoparticles within 24 hours. The biosynthesis of gold nanoparticles was monitored by UV-visible spectroscopy (UV-Vis) and further characterized by X-ray diffraction analysis (XRD), Energy Dispersive Spectroscopy (EDS) and Selected Area Electron Diffraction (SAED). The particle size distribution shows that the average particle size is 50 nm for extra-and 31 nm for intracellular gold nanoparticles. The nanoparticles may be stabilized by proteins secreted by callus cells. The reduction process is believed to occur enzymatically, thus creating the possibility of a rational, plant cell-based method for the synthesis of nanoparticles over a wide range of chemical compositions.

10aBiosynthesis10acallus10agold nanoparticles10alive cells10aPeanut10aTEM1 aRaju, D.1 aMehta, Urmil, J.1 aAhmad, Absar uhttps://library.ncl.res.in/content/extra-and-intracellular-gold-nanoparticles-synthesis-using-live-peanut-callus-cells-001833nas a2200301 4500008004100000022001400041245012300055210006900178260007300247300001200320490000800332520075300340653002301093653001901116653001501135653002101150653001601171653001801187653003201205100002201237700002001259700002901279700002501308700002201333700002201355700002301377856013101400 2013 eng d a0926-337300aOne-pot synthesis of gold nanoparticle/molybdenum cluster/graphene oxide nanocomposite and its photocatalytic activity0 aOnepot synthesis of gold nanoparticlemolybdenum clustergraphene  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcFEB a270-2760 v1303 a

The paper reports on a facile one-pot synthesis of a tri-component gold nanoparticle/molybdenum cluster/graphene oxide (AuNPs@Mo-GO) nanohybrid composite. The synthetic methodology consists on direct UV irradiation of an aqueous solution containing graphene oxide (GO), Na-2[Mo6Br8(N-3)(6)], HAuCl4 center dot 3H(2)O and isopropanol at room temperature in air using a UV fiber lamp. The composite material exhibits very high photocatalytic activity for the degradation of rhodamine B under visible light irradation. The resulting nanohybrid material was characterized using Raman spectroscopy, UV-vis spectrometry, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). (c) 2012 Elsevier B.V. All rights reserved.

10agold nanoparticles10agraphene oxide10aNanohybrid10aPhotodegradation10aRhodamine B10avisible light10a[Mo6Br8(N-3)(6)](2-)cluster1 aBarras, Alexandre1 aDas, Manash, R.1 aDevarapalli, Rami, Reddy1 aShelke, Manjusha, V.1 aCordier, Stephane1 aSzunerits, Sabine1 aBoukherroub, Rabah uhttps://library.ncl.res.in/content/one-pot-synthesis-gold-nanoparticlemolybdenum-clustergraphene-oxide-nanocomposite-and-its-001580nas a2200253 4500008004100000022001400041245012600055210006900181260009500250300001200345490000800357520058400365653001100949653002700960653002300987653004701010653001801057100002201075700002601097700002201123700002101145700002801166856013201194 2014 eng d a0021-979700aCalcium oxide supported gold nanoparticles as catalysts for the selective epoxidation of styrene by t-butyl hydroperoxide0 aCalcium oxide supported gold nanoparticles as catalysts for the  a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcFEB a111-1160 v4153 a

Gold nanoparticles are deposited on basic CaO supports as catalysts for the selective conversion of styrene into styrene oxide. Synthetic methods, gold loading and calcination temperatures are varied to permit an understanding of their influence on gold nanoparticle size, the presence of cationic gold species and the nature of interaction between the gold nanoparticles and the CaO support. Based on these studies, optimal conditions are designed to make the Au/CaO catalyst efficient for the selective epoxidation of styrene. (C) 2013 Elsevier Inc. All rights reserved.

10aAu/CaO10aEpoxidation of styrene10agold nanoparticles10aHomogenous deposition precipitation method10aStyrene oxide1 aDumbre, Deepa, K.1 aChoudhary, Vasant, R.1 aPatil, Nilesh, S.1 aUphade, Balu, S.1 aBhargava, Suresh, Kumar uhttps://library.ncl.res.in/content/calcium-oxide-supported-gold-nanoparticles-catalysts-selective-epoxidation-styrene-t-butyl-002290nas a2200253 4500008004100000022001400041245012700055210006900182260011000251300001400361490000700375520131500382653001701697653002301714653002101737653001701758653001501775100002701790700002401817700002001841700002601861700002001887856012901907 2014 eng d a0019-518900aDevelopment of bioconjugate from streptomyces tyrosinase and gold nanoparticles for rapid detection of phenol constituents0 aDevelopment of bioconjugate from streptomyces tyrosinase and gol aDR K S KRISHNAN MARG, PUSA CAMPUS, NEW DELHI 110 012, INDIAbNATL INST SCIENCE COMMUNICATION-NISCAIRcNOV a1071-10810 v523 a

Most of the phenol compounds are toxic and have been considered as hazardous pollutants. Several physicochemical and biological methods are available to detect and monitor the phenol pollutants in water and soil. In the present study, phenol constituents of winery, paper and plastic industrial effluents were successfully detected employing tyrosinase-gold nanoparticles bioconjugate. The synthesis of extracellular tyrosinase and gold nanoparticles was achieved by a single isolate of Streptomyces sp. DBZ-39. Enhanced production (369.41 IU) of tyrosinase was produced in submerged bioprocess employing response surface method with central composite design. Extracellular gold nanoparticles synthesized (12-18 nm) by Streptomyces sp. DBZ-39 were characterized with TEM, EDAX and FTIR analysis. A rapid detection (within 10 min) of phenol constituents from winery effluents was achieved by bioconjugate, when compared to tyrosinases and gold nanoparticles independently. Streptomyces tyrosinase could exhibit relatively a better performance than commercially available mushroom tyrosinase in the detection of phenol constituents. Winery effluent has shown much higher content (0.98 O.D) of phenol constituents than paper and plastic effluents based on the intensity of color and U.V absorption spectra.

10aBioconjugate10agold nanoparticles10aPhenol detection10aStreptomyces10aTyrosinase1 aZainab, Mazhari, Bi Bi1 aMadhusudhan, D., N.1 aRaghavendra, H.1 aDastager, Syed, Gulam1 aDayanand, Agsar uhttps://library.ncl.res.in/content/development-bioconjugate-streptomyces-tyrosinase-and-gold-nanoparticles-rapid-detection-001344nas a2200205 4500008004100000022001400041245010500055210006900160260007300229300001200302490000800314520055700322653002100879653002300900653001500923653001800938100002100956700003000977856013101007 2014 eng d a0927-775700aDilution does the trick: role of mixed solvent evaporation in controlling nanoparticle self-assembly0 aDilution does the trick role of mixed solvent evaporation in con aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR a142-1470 v4473 a

An easy and convenient way to prepare superlattices of amine capped gold nanoparticles is presented. It is clearly established that solvent evaporation significantly influences the nature of resulting superlattices and critically governs whether monolayer or multilayer superlattices are formed. More specifically, it is demonstrated that dilution of the nanoparticle dispersion with a similar solvent (but with different vapour pressure) is an expedient handle to control the nature of self-assembly. (C) 2014 Elsevier B.V. All rights reserved.

10aEvaporation rate10agold nanoparticles10aNucleation10aSelf-assembly1 aSahu, Puspanjali1 aPrasad, Bhagavatula L. V. uhttps://library.ncl.res.in/content/dilution-does-trick-role-mixed-solvent-evaporation-controlling-nanoparticle-self-assembly-001440nas a2200229 4500008004100000022001400041245010300055210006900158260007400227300000900301490000700310520055400317653002800871653002300899653003600922653001800958653002200976100002600998700002901024700002501053856013201078 2014 eng d a1388-076400aFunctional silicon nanostructures derived from drying-mediated self-assembly of gold nanoparticles0 aFunctional silicon nanostructures derived from dryingmediated se aVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDSbSPRINGERcAPR a23720 v163 a

Self-assembly of nanoparticles is an efficient technique where nanobuilding blocks spontaneously organize into ordered structures by thermodynamic and other constraints. We demonstrate that multifunctional Silicon (Si) nanostructures with unique morphologies like sheets, plates and flakes can be etched chemically by taking an advantage of natural self-assembly of gold nanoparticles (AuNPs) characterized with drying kinetics under external stimuli. We further demonstrated antireflection properties of the as-synthesized Si nanostructures.

10aAntireflective material10agold nanoparticles10aMetal-assisted chemical etching10aSelf-assembly10aSi Nanostructures1 aDeshmukh, Ashvini, B.1 aDevarapalli, Rami, Reddy1 aShelke, Manjusha, V. uhttps://library.ncl.res.in/content/functional-silicon-nanostructures-derived-drying-mediated-self-assembly-gold-nanoparticles-002002nas a2200253 4500008004100000022001400041245013400055210006900189260007300258300001200331490000700343520106300350653001401413653002501427653001901452653001701471653002301488653002301511100002301534700002001557700001901577700003001596856012201626 2014 eng d a0928-493100aIn situ synthesized BSA capped gold nanoparticles: effective carrier of anticancer drug methotrexate to MCF-7 breast cancer cells0 aIn situ synthesized BSA capped gold nanoparticles effective carr aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJAN a158-1670 v343 a

The proficiency of MTX loaded BSA capped gold nanoparticles (Au-BSA-MTX) in inhibiting the proliferation of breast cancer cells MCF-7 as compared to the free drug Methotrexate (MTX) is demonstrated based on MTT and Ki-67 proliferation assays. In addition, DNA ladder gel electrophoresis studies, flow cytometry and TUNEL assay confirmed the induction of apoptosis by MTX and Au-BSA-MTX in MCF-7 cells. Notably, Au-BSA-MTX: was found to have higher cytotoxicity on MCF-7 cells compared with an equivalent dose of free MTX. The enhanced activity is attributed to the preferential uptake of Au-BSA-MTX particles by MCF-7 cells due to the presence of BSA that acts as a source of nutrient and energy to the rapidly proliferating MCF-7 cells. Moreover, the targeting ability of the drug MTX to the over expressed folate receptors on MCF-7 cells also contributes to the enhanced uptake and activity. Taken together, these results unveil that Au-BSA-MTX could be more effective than free drug for cancer treatment. (C) 2013 Elsevier B.V. All rights reserved.

10aApoptosis10aBovine serum albumin10aCancer therapy10aCytotoxicity10aDual active agents10agold nanoparticles1 aMurawala, Priyanka1 aTirmale, Amruta1 aShiras, Anjali1 aPrasad, Bhagavatula L. V. uhttps://library.ncl.res.in/content/situ-synthesized-bsa-capped-gold-nanoparticles-effective-carrier-anticancer-drug-001644nas a2200229 4500008004100000022001400041245012700055210006900182260007700251300001400328490000600342520075500348653002601103653002301129653001401152653001201166100003501178700002801213700001701241700002801258856012801286 2015 eng d a1867-388000aActivity enhancement upon the incorporation of titanium: au@ti-sio2 core-shell nanocatalysts for the CO oxidation reaction0 aActivity enhancement upon the incorporation of titanium autisio2 aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcAPR a1222-12300 v73 a

The encapsulation of gold nanoparticles 8-12nm in size within a porous Ti-SiO2 shell to form a core-shell nanoarchitecture was investigated, and the catalytic activity of the resulting structure was probed. Detailed characterization of the synthesized materials shows that the core-shell morphology is lost beyond a certain amount of incorporated titanium, and results in normal gold-supported Ti-SiO2. The material has a high surface area (913m(2)g(-1)) and high porosity, both of which make it an excellent choice for catalytic applications. With the optimum amount of incorporated Ti, the core-shell catalyst shows excellent room-temperature CO oxidation activity over several cycles with retention of its morphology at higher temperatures.

10acore-shell structures10agold nanoparticles10aOxidation10aTi-SiO21 aSekhar, Anandakumari, C. Sunil1 aZiyad, Kottavarithottil1 aSoni, Yogita1 aVinod, Chathakudath, P. uhttps://library.ncl.res.in/content/activity-enhancement-upon-incorporation-titanium-auti-sio2-core-shell-nanocatalysts-co-001839nas a2200229 4500008004100000022001400041245008300055210006900138260009200207300001400299490000700313520105400320653002301374653001101397653001301408653001501421653001001436100001301446700002101459700001701480856011201497 2015 eng d a1533-488000aSimple recovery of intracellular gold nanoparticles from peanut seedling roots0 aSimple recovery of intracellular gold nanoparticles from peanut  a26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USAbAMER SCIENTIFIC PUBLISHERScFEB a1575-15810 v153 a

Fabrication of inorganic nanomaterials via a biological route witnesses the formation either extracellularly, intracellulary or both. Whereas extracellular formation of these nanomaterials is cherished owing to their easy and economical extraction and purification processes; the intracellular formation of nanomaterials, due to the lack of a proper recovery protocol has always been dreaded, as the extraction processes used so far were tedious, costly, time consuming and often resulting in very low recovery. The aim of the present study was to overcome the problems related with the extraction and recovery of intracellularly synthesized inorganic nanoparticles, and to devise a method to increasing the output, the shape, size, composition and dispersal of nanoparticles is not altered. Water proved to be much better system as it provided well dispersed, stable gold nanoparticles and higher recovery. This is the first report, where intracellular nanoparticles have been recovered using a very cost-effective and eco-friendly approach.

10agold nanoparticles10aPeanut10aRecovery10aSonication10aWater1 aRaju, D.1 aMehta, Urmil, J.1 aAhmad, Absar uhttps://library.ncl.res.in/content/simple-recovery-intracellular-gold-nanoparticles-peanut-seedling-roots-001770nas a2200205 4500008004100000022001400041245011600055210006900171260006500240300000800305490000700313520097500320653002301295653002001318653000901338653001501347100003701362700003601399856012901435 2016 eng d a1420-304900aGold incorporated mesoporous silica thin film model surface as a robust SERS and catalytically active substrate0 aGold incorporated mesoporous silica thin film model surface as a aST ALBAN-ANLAGE 66, CH-4052 BASEL, SWITZERLANDbMDPI AGcMAY a6670 v213 a

Ultra-small gold nanoparticles incorporated in mesoporous silica thin films with accessible pore channels perpendicular to the substrate are prepared by a modified sol-gel method. The simple and easy spin coating technique is applied here to make homogeneous thin films. The surface characterization using FESEM shows crack-free films with a perpendicular pore arrangement. The applicability of these thin films as catalysts as well as a robust SERS active substrate for model catalysis study is tested. Compared to bare silica film our gold incorporated silica, GSM-23F gave an enhancement factor of 10(3) for RhB with a laser source 633 nm. The reduction reaction of p-nitrophenol with sodium borohydride from our thin films shows a decrease in peak intensity corresponding to -NO2 group as time proceeds, confirming the catalytic activity. Such model surfaces can potentially bridge the material gap between a real catalytic system and surface science studies.

10agold nanoparticles10amodel catalysis10aSERS10aThin films1 aSekhar, Anandakumari, Chandrasek1 aVinod, Chathakudath, Prabhakara uhttps://library.ncl.res.in/content/gold-incorporated-mesoporous-silica-thin-film-model-surface-robust-sers-and-catalytically02540nas a2200253 4500008004100000022001400041245013000055210006900185260000800254490000800262520161400270653001101884653001301895653001601908653001101924653001101935653001101946653002301957653010301980653003002083100002102113700002502134856012702159 2017 eng d a0021-979700aStudies on the role of unsaturation in the fatty acid surfactant molecule on the thermal conductivity of magnetite nanofluids0 aStudies on the role of unsaturation in the fatty acid surfactant cNOV0 v5063 a

To study the role of unsaturation in the surfactant molecule on the thermal conductivity of magnetite nanofluids, four different fatty acid (stearic, oleic, linoleic, and linolenic acids with different degree of unsaturation) coated magnetite nanoparticles of comparable size are prepared and dispersed in toluene. It is found that the nanofluid with the saturated fatty acid coated nanoparticles show larger viscosity than the fluid with the unsaturated fatty acid coated particles at all concentrations. Thermal conductivity studies show enhancement only above a critical concentration for all fluids. The critical concentration for thermal conductivity enhancement varies with the surfactant, possibly due to the difference in the degree of aggregation of the nanoparticles in the fluid, because of the difference in the conformation of the surfactant molecules on the nanoparticle's surface. The experimental thermal conductivity follows the Maxwell model at higher concentrations. From the overall studies, it is observed that the thermal conductivity of the fluids with aggregated or assembled nanoparticles shows slightly larger enhancement than that of the fluids with isolated particles. However, in the presence of a magnetic field, the fluids with isolated nanoparticles showed relatively larger enhancement, possibly due to the easy response of the isolated magnetite nanoparticles to the applied field. (C) 2017 Elsevier Inc. All rights reserved.

10aChains10aDynamics10aEnhancement10aFields10aFluids10aForces10agold nanoparticles10aMagnetic fluid; Nanofluid; Surfactant; Unsaturation; Conformation; Thermal conductivity; Viscosity10aSelf-assembled Monolayers1 aLenin, Ramanujam1 aJoy, Pattayil, Alias uhttps://library.ncl.res.in/content/studies-role-unsaturation-fatty-acid-surfactant-molecule-thermal-conductivity-magnetite02873nas a2200277 4500008004100000022001400041245013300055210006900188260000800257300001200265490000700277520189600284653003802180653002302218653001702241653002302258653002702281100002102308700001902329700001702348700002502365700001802390700002702408700003002435856013002465 2023 eng d a1139-670900aBiosynthesis of gold nanoparticles by Penicillium rubens and catalytic detoxification of ochratoxin A and organic dye pollutants0 aBiosynthesis of gold nanoparticles by Penicillium rubens and cat cNOV a765-7800 v263 a

The environmental pollution caused by chemical dyes is a growing concern nowadays. Limitations of traditional methods opened the route for nanotechnology; owing to the versatile properties of nanomaterials, gold nanoparticles (AuNPs) became a potential strategy for different applications. In the present study, biosynthesis of gold nanoparticles (BioAuNPs) was carried out by reacting chloroauric acid (HAuCl4) with cell-free filtrate of Penicillium rubens sp. nov. NCIM 1937. The AuNPs were then characterized by UV-visible spectroscopy, HR-TEM, FTIR, and DLS analysis to further examine their efficacious biosynthesis and morphological properties including size, shape, and stability. The biogenic AuNPs are polydisperse in nature, with a mean size of 14.92 +/- 5 nm. These AuNPs exhibited promising antimicrobial activity against Escherichia coli NCIM-2065, Bacillus subtilis NCIM-2010, and Penicillium verrucosum MTCC 4935. In vitro quantitative HPLC results revealed that BioAuNPs significantly inhibited the biosynthesis of ochratoxin A (OTA). Microbial fuel cells (MFCs) are intriguing for power generation and wastewater treatment since they can directly transform chemical energy stored in organic matter to electricity by extracellular electron transfer (EET) via membrane proteins. AuNPs also showed excellent potential for dye degradation of organic pollutants, viz., methylene blue (MB), phenol red (PR), bromothymol blue (BTB), Congo red (CR), and 4-nitrophenol (4-NP). All dye removal efficiencies were estimated and fitted to pseudo-first-order processes using kinetic rate constants (Ka).The present study reveals a simple, original, and eco-friendly method for the synthesis of multifunctional biogenic AuNPs that could be effective in OTA detoxification in food products and organic pollutant removal during wastewater treatment for a sustainable environment.

10aCatalytic organic dye degradation10agold nanoparticles10aOchratoxin A10aPenicillium rubens10aPenicillium verrucosum1 aBhandari, Yogesh1 aVarma, Sanjana1 aSawant, Amol1 aBeemagani, Sreelatha1 aJaiswal, Neha1 aChaudhari, Bhushan, P.1 aVamkudoth, Koteswara, Rao uhttps://library.ncl.res.in/content/biosynthesis-gold-nanoparticles-penicillium-rubens-and-catalytic-detoxification-ochratoxin02149nas a2200241 4500008004100000022001400041245009500055210006900150260000800219300001100227490000800238520134100246653003001587653002301617653001801640653001901658653002201677100001901699700001901718700002601737700002301763856012101786 2023 eng d a1385-894700aTransient response to perturbations in flow synthesis of citrate capped gold nanoparticles0 aTransient response to perturbations in flow synthesis of citrate cAUG a1438900 v4703 a

This work reports the transient behavior of continuous flow synthesis of gold nanoparticles (Au NPs) when subjected to perturbations in operating conditions using controlled experiments. The intricacies are captured through a detailed mathematical model. Reversed Turkevich protocol was used for synthesis of Au NPs. The synthesis was first studied in batch mode to investigate the reaction kinetics and reproducibility of the process. The optimal set of operating conditions viz., residence time, flow rate, temperature was then used for flow synthesis in a 2 m, 1/16 & DPRIME;Polytetrafluoroethylene (PTFE) reactor with micromixer. Reactor clogging was avoided by using segmented flow. Inline UV measurement was used for real time monitoring of the process. Transient experiments were performed by abruptly changing the operating conditions. A mathematical model was found to be accurate in predicting the transient behavior of the exit precursor concentration and the particle size for unsteady state synthesis. Even a small change in process variables for short duration was found to disturb the quality of Au NPs for a significantly longer duration. Of the three operating parameters, the effect of temperature variation was seen to have a prolonged effect where the system remained in unsteady state for long time.

10acontinuous flow synthesis10agold nanoparticles10aParticle size10asegmented flow10aUnsteady behavior1 aBari, Atul, H.1 aShukla, Neerja1 aGavriilidis, Asterios1 aKulkarni, Amol, A. uhttps://library.ncl.res.in/content/transient-response-perturbations-flow-synthesis-citrate-capped-gold-nanoparticles02466nas a2200253 4500008004100000245018700041210006900228260000900297300001600306490000600322520149000328653001901818653002301837653002001860653002301880653001901903100001901922700002101941700003801962700003102000700003002031700003102061856012002092 2025 eng d00aVastly increased mesophase range due to superstructure formation from in situ prepared gold nanoparticles with liquid crystalline ligands: toward enhanced optoelectronic applications0 aVastly increased mesophase range due to superstructure formation cMAY  a10340-103500 v83 a

Gold nanoparticle (Au NP)-liquid crystal (LC) composites have gained considerable interest in developing cutting-edge electro-optical materials. This study introduces an innovative synthetic approach that significantly augments the capabilities of Au NP-LC composites by utilizing an amine-functionalized LC as both a reducing and capping agent in the refined Brust-Schiffrin method. In its standard form, this method yields Au NP-LC composites with appealing features like improved clearing temperature. However, the optical characteristics do not display any additional features and resemble simple LC-ligand functionalized Au NP, attributed here to the surplus LC employed to obtain the dual capabilities of reduction and capping. Thus, it was gratifying to observe a dramatic enhancement in mesophase stability with the removal of just a few percentages of excess LC, which is attributed to a remarkable and unprecedented one-dimensional superstructure formation. Furthermore, the removal of surplus LC caused the composite to exhibit Fano-like resonance in the UV-vis spectrum, a noteworthy optical feature likely resulting from dynamic plasmonic interactions, including plasmon-polariton interactions and lattice plasmon modes. Thus, the simple yet robust protocol employed yields Au NP-LC composites with an ultrawide thermal range of the mesophase that paves the way for realizing next-generation electro-optic materials featuring enhanced performance and response.

10aFano-resonance10agold nanoparticles10aliquid crystals10ananosoftcomposites10asuperstructure1 aDuggal, Muskan1 aKhatavi, Santosh1 aYelamaggad, Channabasaveshwar, V.1 aRao, Doddamane, Sreenivasa1 aPrasad, Subbarao, Krishna1 aPrasad, Bhagavatula, L. V. uhttps://library.ncl.res.in/content/vastly-increased-mesophase-range-due-superstructure-formation-situ-prepared-gold