Entity

Time filter

Source Type


Kansara A.M.,Indian Central Salt and Marine Chemicals Research Institute | Kansara A.M.,Academy of Scientific and Innovative Research AcSIR CSMCRI | Aswal V.K.,Bhabha Atomic Research Center | Singh P.S.,Indian Central Salt and Marine Chemicals Research Institute | Singh P.S.,Academy of Scientific and Innovative Research AcSIR CSMCRI
RSC Advances | Year: 2015

Poly(dimethylsiloxane) (PDMS) membrane, which is generally prepared by cross-linking a hydroxyl-terminated-poly(dimethylsiloxane) liquid with a polymethylhydrosiloxane cross-linker through a condensation reaction between the hydroxyl end groups and hydride groups liberating hydrogen, is one of the most studied polymeric membranes for the separation of gases and liquids. Herein, a new PDMS membrane series prepared by direct cross-linking hydroxyl terminated polydimethylsiloxane pre-polymer liquid with RSiCl3 molecules of different types in n-heptane solvent under a nitrogen environment were studied, wherein the alkyl chain, R, was varied as methyl CH3, octyl C8H17, perfluorooctyl C8H4F13, and octadecyl C18H37. For each membrane series, the amount of cross-linker to pre-polymer was varied as 13 : 87, 33 : 67 and 50 : 50 (w/w) to compare the membranes at different cross-linking densities. The cross-linked network structure of the membrane comprised dimethylsiloxane network structures of two cross-links and alkylsiloxane network structure of two or three cross-links. The changes in the structure and properties of the membranes depending on the concentration and type of trichloro(alkyl)silane used were observed by XRD, SEM, TEM, SANS, TGA, DSC, 29Si NMR, IR, cross-linking density, contact angle (water) and ethanol-water separation performance measurements. The membranes with an optimal amount of trichloro(alkyl)silane cross-linker of approximately 10-30% (w/w) showed better separation performance than the other reported conventional PDMS membranes in terms of the ethanol selectivity and flux from an aqueous feed containing 5% (w/w) ethanol. Among the membranes prepared, the membranes cross-linked with perfluorooctylsiloxane/octadecylsiloxane showed better separation performance than those membranes cross-linked with methylsiloxane/octylsiloxane. This journal is © The Royal Society of Chemistry 2015. Source


Bisht K.K.,Indian Central Salt and Marine Chemicals Research Institute | Bisht K.K.,Academy of Scientific and Innovative Research AcSIR CSMCRI | Suresh E.,Indian Central Salt and Marine Chemicals Research Institute | Suresh E.,Academy of Scientific and Innovative Research AcSIR CSMCRI
Journal of the American Chemical Society | Year: 2013

It is observed that conglomerate crystallization of achiral precursors yielding racemate metal organic frameworks/coordination polymers (MOFs/CPs) can be driven to absolute homochiral crystallization of the desired enantiomorph by utilizing a suitable chiral induction agent. In a series of crystallization experiments isostructural Zn and Co homochiral CPs (1P, 1M and 2P, 2M) are prepared using the achiral precursors. In the presence of enantiopure camphoric acid, the crystallization process prefers absolute chiral induction over conglomerate formation which is established by single crystal X-ray diffraction and CD spectroscopy. © 2013 American Chemical Society. Source


Trivedi N.,Indian Central Salt and Marine Chemicals Research Institute | Trivedi N.,Academy of Scientific and Innovative Research AcSIR CSMCRI | Gupta V.,Indian Central Salt and Marine Chemicals Research Institute | Reddy C.R.K.,Indian Central Salt and Marine Chemicals Research Institute | And 2 more authors.
Bioresource Technology | Year: 2013

The green seaweed Ulva which proliferates fast and occurs abundantly worldwide was used as a feedstock for production of ethanol following enzymatic hydrolysis. Among the different cellulases investigated for efficient saccharification, cellulase 22119 showed the highest conversion efficiency of biomass into reducing sugars than Viscozyme L, Cellulase 22086 and 22128. Pre-heat treatment of biomass in aqueous medium at 120. °C for 1. h followed by incubation in 2% (v/v) enzyme for 36. h at 45. °C gave a maximum yield of sugar 206.82. ±. 14.96. mg/g. The fermentation of hydrolysate gave ethanol yield of 0.45. g/g reducing sugar accounting for 88.2% conversion efficiency. These values are substantially higher than those of reported so far for both agarophytes and carrageenophytes. It was also confirmed that enzyme can be used twice without compromising on the saccharification efficiency. The findings of this study reveal that Ulva can be a potential feedstock for bioethanol production. © 2013 Elsevier Ltd. Source


Veerababu P.,Indian Central Salt and Marine Chemicals Research Institute | Vyas B.B.,Indian Central Salt and Marine Chemicals Research Institute | Singh P.S.,Indian Central Salt and Marine Chemicals Research Institute | Singh P.S.,Academy of Scientific and Innovative Research AcSIR CSMCRI | And 2 more authors.
Desalination | Year: 2014

A systematic study was carried out to explore limiting thickness of the state-of-the-art nanofiltration membrane. The interfacial polymerization between aqueous solution of piperazine and organic solution of trimesoyl chloride over polysulfone ultrafiltration supports of average pore size 20, 100 and 200nm, respectively had been performed to vary the membrane thickness and properties. The prepared membranes were designated as TFC-12, TFC-15 and TFC-24, respectively. Influence of the supports on membrane thickness, surface roughness and potential was observed by SEM, AFM, ATR-IR and zeta-potential measurements. The membrane thickness and surface roughness were found in increasing order of TFC-12 Source


Kansara A.M.,Indian Central Salt and Marine Chemicals Research Institute | Kansara A.M.,Academy of Scientific and Innovative Research AcSIR CSMCRI | Chaudhri S.G.,Indian Central Salt and Marine Chemicals Research Institute | Singh P.S.,Indian Central Salt and Marine Chemicals Research Institute | Singh P.S.,Academy of Scientific and Innovative Research AcSIR CSMCRI
RSC Advances | Year: 2016

A facile one-step dip-coating method is reported here to prepare recyclable superhydrophobic polypropylene membrane. Membranes with nanoscale surface roughness and contact angle (water) greater than 150° were created by dipping polypropylene fabric film in a solution of silica nanoparticles networked with alkylsiloxanes and they exhibited excellent oil flux for oil-water separation in a gravity-induced simple separation system. Taking into consideration its separation selectivity, productivity flux, reusability and endurance, the membranes show promise in oily wastewater treatment and oil spill cleanup. © 2016 The Royal Society of Chemistry. Source

Discover hidden collaborations