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-002236nas a2200265   4500008004100000022001400041245009600055210006900151260000800220300001600228490000800244520137200252653001901624653001901643653001701662653002101679653001601700100001401716700002201730700002301752700002401775700002501799700002301824856012301847       2019                        eng d  a0304-389400aNovel fatty alkene from marine bacteria: a thermo stable biosurfactant and its applications0 aNovel fatty alkene from marine bacteria a thermo stable biosurfa  cDEC  aUNSP 1208680 v3803 a<p>In this study, a novel thermo stable biosurfactants, 1-Pentanonacontene (C95H190) a fatty alkene and 3-Hydroxy16-methylheptadecanoic acid (C18H36O3) were isolated from a marine isolate SGD-AC-13. Biosurfactants were produced using 1% yeast extract in tap water as production medium at 24 h in flask and 12 h in bioreactor. Using 16S rRNA gene sequence (1515 bp) and BCL card (bioMerieux VITEK (R)), strain was identified as Bacillus sp. Crude biosurfactant reduced the surface tension of distilled water to 31.32 +/- 0.93 mN/m with CMC value of 0.3 mg/ml. Cell free supernatant showed excellent emulsification and oil displacement activity with stability up to 160 degrees C, pH 6-12 and 50 g/L NaCl conc. Biosurfactants were characterized using FTIR, TLC, HPLC LC-MS and NMR spectroscopy. Cell free supernatant reduced the contact angle of distilled water droplet from 117 degrees to 52.28 degrees and of 2% pesticide from 78.77 degrees to 73.42 degrees while 750 mu g/ml of crude biosurfactant reduced from 66.06 degrees to 56.33 degrees for 2% pesticide and recovered 35% ULO and 12% HWCO from the contaminated sand. To our best of knowledge, this is the first report of thermo stable fatty alkene as a biosurfactant and is structurally different from previously reported, with having potential application in agriculture, oil recovery and bioremediation.</p>
10aBioremediation10aBiosurfactants10aFatty alkene10aThermo stability10aWettability1 aRam, Hari1 aSahu, Amit, Kumar1 aSaid, Madhukar, S.1 aBanpurkar, Arun, G.1 aGajbhiye, Jayant, M.1 aDastager, Syed, G.  uhttps://library.ncl.res.in/content/novel-fatty-alkene-marine-bacteria-thermo-stable-biosurfactant-and-its-applications02014nas a2200217   4500008004100000022001400041245008200055210006900137260000800206300001200214490000800226520131400234653002801548653001801576653001801594653001601612100002201628700001501650700002301665856010801688       2021                        eng d  a0263-876200aEffect of wettability on hydrodynamics and mass transfer in small capillaries0 aEffect of wettability on hydrodynamics and mass transfer in smal  cMAY  a265-2740 v1693 a<p>The wettability of the reactor wall has a significant effect on the interfacial liquid?liquid mass transfer rates in segmented flow. This work quantitatively demonstrates the importance of choosing the right material of construction of flow reactors to achieve the desired mass transfer performance. Glass and PTFE capillaries of identical diameter were used to study the effect of hydrophilic and hydrophobic surfaces on the hydrodynamics and mass transfer of the system. It was observed that for the overall mass transfer coefficient (kLa) changed by two orders of magnitude depending on the wettability of the continuous phase. The observations indicated that it is essential to achieve complete wetting of the capillary walls by the continuous phase for significant mass transfer enhancement. The observations are discussed on the basis of film thickness and slip velocity at the wall as well as the slip velocity at liquid?liquid interface. Predictions of the mass transfer coefficient using a model based on the interfacial and fluid properties showed excellent match with the experiments thereby allowing us to explore the effects of wettability on the overall mass transfer coefficient in greater detail. ? 2021 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.</p>10aLiquid?liquid slug flow10aMass transfer10aSlip velocity10aWettability1 aSampat, Chaitanya1 aPal, Sayan1 aKulkarni, Amol, A.  uhttps://library.ncl.res.in/content/effect-wettability-hydrodynamics-and-mass-transfer-small-capillaries