01713nas a2200217   4500008004100000022001400041245009600055210006900151260007300220300001400293490000800307520090000315653003601215653002201251653001601273100002501289700002101314700002201335700001901357856011901376       2010                        eng d  a0169-433200aSwitching of hydrophilic to ultra hydrophilic properties of flower-like gold nanostructures0 aSwitching of hydrophilic to ultra hydrophilic properties of flow  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR  a4192-41950 v2563 a<p>Flower-like morphologies of gold nanostructures were obtained via chemical method by controlling molar concentration ratio of reducing agent and precursor. Chloroauric acid was used as a metal precursor while tri-sodium citrate as the reducing agent. These flower-like structures were characterized by UV-vis spectroscopy, Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) techniques. The basic crystallite size calculated via XRD measurement was found to be similar to 10 nm and remain unaffected by the different concentration ratios. The coating of these structures was made over clean glass substrate and analyzed for wettability by measuring their water contact angles. Our analysis indicates that the coatings of hierarchical flower-like structures of gold are able to provide ultra hydrophilic properties to glass substrate. (C) 2010 Elsevier B.V. All rights reserved.</p>10aGold flower-like nanostructures10aUltra hydrophilic10aWettability1 aDhumale, Vinayak, A.1 aShah, Preeti, V.1 aMulla, Imtiaz, S.1 aSharma, R., B.  uhttps://library.ncl.res.in/content/switching-hydrophilic-ultra-hydrophilic-properties-flower-gold-nanostructures-002050nas a2200277   4500008004100000022001400041245007300055210006900128260007300197300001400270490000700284520108200291653002401373653003701397653002901434653002101463653001301484653003101497100002501528700002401553700002101577700002601598700002201624700002201646856010401668       2011                        eng d  a0167-577X00aSynthesis of cube-shaped gold nanostructures by electron irradiation0 aSynthesis of cubeshaped gold nanostructures by electron irradiat  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUN  a1605-16070 v653 a<p>The needle-like gold nanostructures were synthesized by using chloroauric acid (HAuCl(4)) as a metal precursor and sodium borohydride (NaBH(4)) as the reducing agent. These needle-like nanostructures of gold were irradiated with high energy electrons (E-6 MeV, phi similar to 10(12) e cm(-2) s(-1)). The pre- and post-irradiated gold nanostructures were characterized by Scanning Electron Microscopy (SEM), UV-vis spectroscopy, X-ray Diffraction (XRD) and contact angle measurement (GBX-Model Digidrop) techniques. The results of the SEM revealed that after electron irradiation, the needle-like gold structures got fragmented into identical cube-shaped gold nanostructures, though of different sizes. The XRD analysis indicated that the average crystallite size of the gold nanostructures remained unchanged even after irradiation with high energy electrons. A glass surface showed hydrophilic behavior when coated with needle-like nanostructures and became ultra hydrophilic when coated with cube-shaped gold nanostructures. (C) 2011 Elsevier B.V. All rights reserved.</p>10aGold nanostructures10aHigh energy electron irradiation10aNanostructured materials10aRadiation damage10aSurfaces10aUltra hydrophilic surfaces1 aDhumale, Vinayak, A.1 aGangwar, Rajesh, K.1 aShah, Preeti, V.1 aBhoraskar, Vasant, N.1 aMulla, Imtiaz, S.1 aSharma, Rishi, B.  uhttps://library.ncl.res.in/content/synthesis-cube-shaped-gold-nanostructures-electron-irradiation-0