01728nas a2200181   4500008004100000022001400041245015700055210006900212260007100281300001200352490000700364520098500371100002001356700001201376700001701388700001501405856012601420       2005                        eng d  a0897-475600aControlling the optical properties of lemongrass extract synthesized gold nanotriangles and potential application in infrared-absorbing optical coatings0 aControlling the optical properties of lemongrass extract synthes  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcFEB  a566-5720 v173 a<p>Anisotropic metal nanoparticles have distinct optical behavior when compared with their spherical counterparts. In this report, we demonstrate a simple method involving the reduction of aqueous gold ions by the extract of the lemongrass plant leading to the formation of gold nanotriangles with interesting absorption in the near-infrared (NIR) region of the electromagnetic spectrum. We show that, by simple variation of the experimental conditions, it is possible to vary the size of the gold nanotriangles and, thus, to tune the absorbance of flat gold nanoparticles in the NIR region. The NIR absorption of the gold nanotriangles is expected to be of application in hyperthermia of cancer cells and in IR-absorbing optical coatings. We show that the lemongrass extract synthesized gold nanotriangles can be easily cast in the form of films on glass substrates and that these films are highly efficient in absorbing IR radiation for potential architectural applications.</p>1 aShankar, S., S.1 aRai, A.1 aAhmad, Absar1 aSastry, M.  uhttps://library.ncl.res.in/content/controlling-optical-properties-lemongrass-extract-synthesized-gold-nanotriangles-and-001735nas a2200253   4500008004100000022001400041245010500055210006900160260007100229300001200300490000700312520087800319653002401197653001501221653001301236653001701249653002001266653000801286100001201294700001401306700001701320700001501337856012901352       2006                        eng d  a1520-610600aRole of halide ions and temperature on the morphology of biologically synthesized gold nanotriangles0 aRole of halide ions and temperature on the morphology of biologi  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJAN  a736-7410 v223 a<p>{In this paper, we demonstrate the effect of halide ions on the formation of biogenically prepared gold nanotriangles using the leaf extract of lemongrass (Cymbopogonflextiosus) plant. We have also studied the effect of halide ions on the morphology of biogenic nanotriangles. It has been shown that iodide ions have a greater propensity to transform flat gold nanotriangles into circular disklike structures as compared to other halide ions. The study also suggests that the presence of Cl- ions during the synthesis promotes the growth of nanotriangles, whereas the presence of I- ions distorts the nanotriangle morphology and induces the formation of aggregated spherical nanoparticles. The change in the morphology of gold nanotriangles has been explained in terms of the ability of the halide ions to stabilize or inhibit the formation of (I 11) faces to form [</p>10aDME steam reforming10afuel cells10aHydrogen10aMixed oxides10asupported Ga2O310aXPS1 aRai, A.1 aSingh, A.1 aAhmad, Absar1 aSastry, M.  uhttps://library.ncl.res.in/content/role-halide-ions-and-temperature-morphology-biologically-synthesized-gold-nanotriangles-102094nas a2200265   4500008004100000022001400041245012900055210006900184260008900253300001200342490000700354520110500361653002801466653001701494653003901511100002101550700001901571700001901590700001201609700002101621700002501642700001801667700001501685856012801700       2006                        eng d  a0971-457X00aVapour phase methylation of phenol over nanocrystalline ZnFe(2-x)A1(x)O(4) (x=0, 0.25, 0.5, 0.75 and 1.0) ferrospinel system0 aVapour phase methylation of phenol over nanocrystalline ZnFe2xA1  aDR K S KRISHNAN MARG, NEW DELHI 110 012, INDIAbNATL INST SCIENCE COMMUNICATIONcSEP  a493-4980 v133 a<p>The alkylation ofphenol with methanol was carried out over ZnFe2-xAlxO4 (x = 0, 0.25, 0.5, 0.75 and 1.0) type spinel systems in a Fixed bed, down flow reactor. The influence of Surface acidity, cation distribution in the spinel lattice and various reaction parameters are discussed. A maximum yield of 70.9 and 22.9% with selectivity of 73.5 and 23.3% was obtained for 2,6-xylenol and o-cresol respectively, giving a total ortho selectivity of: 96.8% over ZnFeAlO4 at 350 degrees C, methanol to phenol molar ratio of 5 and WHSV of 0.6 h(-1). Catalyst characterization was made by XRD, Mossbauer spectroscopy, ammonia desorption and BET surface area measurements. Mossbauer spectroscopy reveals isomorphic substitution or Fe 3 by smaller A 13, into the octahedral sites leading to lattice distortion, Unsymmetrical charge distribution and charge transfer from iron to oxygen making it more basic and proton attracting. This helps vertical adsorption ofphenol and formation of 2.6-xylenol. It has been concluded that catalyst acidity plays major role in the reaction as compared to surface area.</p>10aconsecutive methylation10aferrospinels10avertical and horizontal adsorption1 aReddy, Vanga, S.1 aRadheShyam, A.1 aDwivedi, Reena1 aRai, A.1 aAnilkumar, Mettu1 aChumbhale, Vilas, R.1 aAswar, A., S.1 aPrasad, R.  uhttps://library.ncl.res.in/content/vapour-phase-methylation-phenol-over-nanocrystalline-znfe2-xa1xo4-x0-025-05-075-and-10-0