01955nas a2200217   4500008004100000022001400041245019100055210006900246260007100315300001400386490000700400520106100407100001701468700001901485700002001504700002201524700002101546700002001567700001901587856013101606       2008                        eng d  a0897-475600aExtracellular bacterial synthesis of protein-functionalized ferromagnetic Co3O4 nanocrystals and imaging of self-organization of bacterial cells under stress after exposure to metal ions0 aExtracellular bacterial synthesis of proteinfunctionalized ferro  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcFEB  a1484-14910 v203 a<p>Co3O4, which crystallizes in the spinet phase at temperatures much higher than ambient temperatures, orders antiferromagnetically below its Neel temperature (similar to 40 K). However, in nanosize, it shows ferromagnetic ordering due to surface canting, disorder, imperfect oxygen atom coordination, etc. Here, for the first time, we report the synthesis of single-crystalline, ferromagnetic Co3O4 nanoparticles functionalized with proteins (size 5-7 nm) using cobalt acetate as precursor at room temperature in aqueous medium by a metal-tolerant marine bacterium isolated from the coast of the Arabian Sea. Energetically unfavorable change in the oxidation state of Co atoms from (+2 to +3) during synthesis by the bacterial strain was evidenced by X-ray photoelectron spectroscopy. The effect on the morphology of bacterial cells after exposure to the cobalt acetate was imaged by scanning electron microscopy showing cooperative, self-organized. structured colony formation, possibly due to the interbacterial communication under external stress.</p>1 aKumar, Umesh1 aShete, Ashvini1 aHarle, Arti, S.1 aKasyutich, Oksana1 aSchwarzacher, W.1 aPundle, Archana1 aPoddar, Pankaj  uhttps://library.ncl.res.in/content/extracellular-bacterial-synthesis-protein-functionalized-ferromagnetic-co3o4-nanocrystals-001730nas a2200193   4500008004100000022001400041245009000055210006900145260007100214300001400285490000800299520099400307100002501301700002601326700002001352700002701372700002501399856011201424       2008                        eng d  a1932-744700aKinetics of PbCrO(4) nanorod growth by oriented attachment at the air-water interface0 aKinetics of PbCrO4 nanorod growth by oriented attachment at the   a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAY  a7557-75610 v1123 a<p>Oriented attachment is a new way of crystal growth to transform preformed nanoparticles into hierarchical assemblies. Here, we demonstrate the use of liquid-liquid interfaces toward the formation of PbCrO(4) nanoparticles and their subsequent time-dependent self-assembly at the air-water interface into nanorods by oriented attachment. EDAX and XPS analysis indicate the formation of stoichiometric PbCrO(4). TEM studies at different stages of aging reveal that the transformation from nanoparticles to nanorods is kinetically governed. HRTEM analysis indicates nanorod growth along the [110] plane. UV-visible spectra reveal the presence of peaks at 425 and 515 nm for nanorods, while for the nanoparticle sample, a single peak at 425 urn is evident. As formation of ultrathin films over a large area (typically equal to or greater than 1 mu m x 1 mu m) concomitantly accompanies this approach, it can be extended to other materials as well for nanostructured device applications.</p>1 aHawaldar, Ranjit, R.1 aSathaye, Shivaram, D.1 aHarle, Arti, S.1 aGholap, Ramkrishna, S.1 aPatil, Kashinath, R.  uhttps://library.ncl.res.in/content/kinetics-pbcro4-nanorod-growth-oriented-attachment-air-water-interface-002244nas a2200265   4500008004100000022001400041245013100055210006900186260005700255300001200312490000600324520126300330653002701593653001201620653001801632653002501650653002201675100002901697700002401726700002801750700002201778700002001800700002601820856013201846       2008                        eng d  a1931-757300aSulfur nanoparticles synthesis and characterization from H2S gas, using novel biodegradable iron chelates in w/o microemulsion0 aSulfur nanoparticles synthesis and characterization from H2S gas  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcJUN  a221-2290 v33 a<p>Sulfur nanoparticles were synthesized from hazardous H2S gas using novel biodegradable iron chelates in w/o microemulsion system. Fe3+-malic acid chelate (0.05 M aqueous solution) was studied in w/o microemulsion containing cyclohexane, Triton X-100 and n-hexanol as oil phase, surfactant, co-surfactant, respectively, for catalytic oxidation of H2S gas at ambient conditions of temperature, pressure, and neutral pH. The structural features of sulfur nanoparticles have been characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), energy dispersive spectroscopy (EDS), diffused reflectance infra-red Fourier transform technique, and BET surface area measurements. XRD analysis indicates the presence of alpha-sulfur. TEM analysis shows that the morphology of sulfur nanoparticles synthesized in w/o microemulsion system is nearly uniform in size (average particle size 10 nm) and narrow particle size distribution (in range of 5-15 nm) as compared to that in aqueous surfactant systems. The EDS analysis indicated high purity of sulfur (&gt; 99%). Moreover, sulfur nanoparticles synthesized in w/o microemulsion system exhibit higher antimicrobial activity (against bacteria, yeast, and fungi) than that of colloidal sulfur.</p>10aAntimicrobial activity10aH2S gas10airon chelates10asulfur nanoparticles10aw/o microemulsion1 aDeshpande, Aniruddha, S.1 aKhomane, Ramdas, B.1 aVaidya, Bhalchandra, K.1 aJoshi, Renuka, M.1 aHarle, Arti, S.1 aKulkarni, Bhaskar, D.  uhttps://library.ncl.res.in/content/sulfur-nanoparticles-synthesis-and-characterization-h2s-gas-using-novel-biodegradable-iron-001994nas a2200181   4500008004100000022001400041245013400055210006900189260011000258300001600368490000700384520121100391100001701602700002001619700002201639700002101661856013001682       2014                        eng d  a1466-803300aDevelopment of a novel method to grow mono-/few-layered MoS2 films and MoS2-graphene hybrid films for supercapacitor applications0 aDevelopment of a novel method to grow monofewlayered MoS2 films   aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcOCT  a10845-108550 v163 a<p>The controlled synthesis of highly crystalline MoS2 atomic layers remains a challenge for practical applications of this emerging material. We demonstrate a facile method to synthesize crystalline mono-layered/few-layered MoS2 thin films at the liquid-liquid interface which can be suitably transferred to the substrates. The films are characterized by XRD for their crystal structure and by SEM and TEM for the morphology. MoS2 nanosheet-graphene nanosheet (MoS2-GNS) hybrid films have been developed by the application of layer-by-layer (LbL) techniques. Cyclic voltammetry and other electrochemical characterization techniques reveal that the hybrid film electrode shows a specific capacitance of 282 F g(-1) at a scan rate of 20 mV s(-1). The as-obtained hybrid electrode is robust and exhibits much improved cycle life (&gt;1000), retaining over 93% of its initial capacitance as revealed by galvanostatic charge/discharge studies. The confirmation of better performance as a supercapacitor of the composite was studied by electrochemical impedance spectroscopy. These results indicate that the MoS2-GNS hybrid is a promising candidate for the electrode material in supercapacitor applications.</p>1 aPatil, Sagar1 aHarle, Arti, S.1 aSathaye, Shivaram1 aPatil, Kashinath  uhttps://library.ncl.res.in/content/development-novel-method-grow-mono-few-layered-mos2-films-and-mos2-graphene-hybrid-films-0