01074nas a2200145 4500008004100000245005700041210005600098260000800154520058500162100002500747700002000772700002500792700003200817856007900849 2009 eng d00aProcess for the preparation of polymeric absorbents 0 aProcess for the preparation of polymeric absorbents cJAN3 aThe invention discloses a process for the preparation of polymeric absorbents useful for gelling organic liquids. The process comprises mixing one or more monomers with a cross-linking agent, a free radical initiator, an optional solvent, optionally in the presence of a transition metal source and subjecting the mixture so obtained to a conventional polymerisation method. The polymer is removed, crushed to obtain polymer powder, washed with solvent and dried by conventional methods to remove unreacted monomers, followed by swelling in alcohols to obtain the desired product.1 aLele, Ashish, Kishor1 aVarghese, Shyni1 aBadiger, Manohar, V.1 aMashelkar, Raghunath, Anant uhttp://library.ncl.res.in/content/process-preparation-polymeric-absorbents01674nas a2200169 4500008004100000022001400041245009600055210006900151260011000220300001600330490000600346520095900352100002001311700002501331700002301356856012501379 2015 eng d a2046-206900aPolyelectrolytes in dilute solution: viscometric access to coil dimensions and salt effects0 aPolyelectrolytes in dilute solution viscometric access to coil d aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAR a27674-276810 v53 a

Copolymers of acrylamide (AM) and diallyldimethylammonium chloride (DADMAC), differing in molar masses M (52.3 to 227 kDa) and degrees of charging y (0.2 to 0.6), were studied with respect to their viscometric behavior in dilute aqueous solutions containing variable amounts of NaCl. Complementary measurements were performed on a Brookhaven 90 plus particle size analyzer. M dominates the intrinsic viscosities [eta]. For the viscometric interaction parameters B this is only true for large concentrations of extra salt. [eta] and B as a function of solvent salinity follow Boltzmann laws. Coil dimensions, determined either via dynamic light scattering or viscometry, agree well. For low salt contents of the solvent the radii decrease with rising polymer concentration, whereas they increase for high salt concentrations; at a characteristic salinity of the solvent they become independent. Zeta potentials grow from +20 to +40 mV as y goes up.

1 aSuresha, P., R.1 aBadiger, Manohar, V.1 aWolf, Bernhard, A. uhttp://library.ncl.res.in/content/polyelectrolytes-dilute-solution-viscometric-access-coil-dimensions-and-salt-effects-002342nas a2200241 4500008004100000022001400041245008200055210006900137260006700206300001200273490000700285520151200292653001401804653001701818653002601835653001701861653001301878100002601891700002401917700002101941700002501962856011301987 2015 eng d a0959-810300aPorous poly(ethylene glycol)-polyurethane hydrogels as potential biomaterials0 aPorous polyethylene glycolpolyurethane hydrogels as potential bi a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcMAR a397-4040 v643 a

We report the synthesis of porous poly(ethylene glycol)-polyurethane (PEG-PU) hydrogels using PEG-4000 as a soft segment and 4,4-methylenebis(cyclohexylisocyanate) as a hard segment. The degree of swelling in the hydrogels could be controlled by varying the amount of crosslinking agent, namely 1,2,6-hexanetriol. Structural characterization of the hydrogels was performed using solid-state C-13 NMR and Fourier transform infrared spectroscopy. Wide-angle X-ray diffraction studies revealed the existence of crystalline domains of PEG and small-angle X-ray scattering studies showed the presence of lamellar microstructures. For generating a porous structure in the hydrogels, cryogenic treatment with lyophilization was used. Scanning electron microscopy and three-dimensional micro-computed tomography imaging of the hydrogels indicated the presence of interconnected pores. The mechanical strength of the hydrogels and xerogels was measured using dynamic mechanical analysis. The observed dynamic storage moduli (E) for the equilibrium swollen and dry gels were found to be 0.15 and 4.2 MPa, respectively. Interestingly, the porous PEG-PU xerogel also showed E of 5.6 MPa indicating a similar mechanical strength upon incorporating porosity into the gel matrix. Finally, preliminary cytocompatibility studies showed the ability of cells to proliferate in the hydrogels. These gels show promise for applications as scaffolds and implants in tissue engineering. (c) 2014 Society of Chemical Industry

10ahydrogels10apermeability10apoly(ethylene glycol)10apolyurethane10aporosity1 aDivakaran, Anumon, V.1 aTorris, Arun, A. T.1 aLele, Ashish, K.1 aBadiger, Manohar, V. uhttp://library.ncl.res.in/content/porous-polyethylene-glycol-polyurethane-hydrogels-potential-biomaterials-002043nas a2200181 4500008004100000245008500041210006900126260000800195300001400203490000700217520140800224100002201632700001901654700002601673700002501699700002501724856011201749 2016 eng d00aProduct distribution in hydrogenation of styrene oxide over Pd/chitosan catalyst0 aProduct distribution in hydrogenation of styrene oxide over Pdch cOCT a7581-75950 v423 a

Palladium-decorated chitosan catalyst was synthesized by an impregnation method by varying the Pd loading in the range of 1-6 %, and was evaluated for the regioselective hydrogenation of styrene oxide. In order to correlate the chemical and textural properties with the catalytic activity, all the prepared catalysts were characterized by techniques such as Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron spectroscopy, thermo-gravimetric analysis, temperature-programmed desorption of NH3, and CO2 and N-2 physisorption. The synthesized catalysts were utilized for the efficient and regioselective ring opening of styrene oxide by hydrogenation under different conditions. The complete conversion of styrene oxide with 65 % selectivity for 2-phenyl ethanol and 33 % for 1-phenyl ethanol were obtained using 4 % Pd/CS catalyst at 70 degrees C temperature and 3 MPa pressure. The mechanism for the regio selective ring opening of styrene oxide to 1- and 2-phenyl ethanol was also proposed on the basis of properties of the catalyst support, catalytic activity and selectivity. These results indicated that the catalytic activity and selectivity of the catalysts were affected by the nature of support. Further, the basic properties of the support play an important role in the selectivity of the styrene oxide hydrogenation reaction.

1 aViswanadhan, Maya1 aPotdar, Aparna1 aDivakaran, Anumon, V.1 aBadiger, Manohar, V.1 aRode, Chandrashekhar uhttp://library.ncl.res.in/content/product-distribution-hydrogenation-styrene-oxide-over-pdchitosan-catalyst02384nas a2200145 4500008004100000245010700041210006900148260000900217300001200226490000700238520182700245100001702072700002502089856012402114 2019 eng d00a Polysaccharide hydrogel incorporated carbon nanofiber microelectrode for designing neural interfaces 0 aPolysaccharide hydrogel incorporated carbon nanofiber microelect cJULY a696-7100 v163 a

Bionic devices are an integral part of human life, and continuous innovations in their design and functions with the help of nanotechnology has revolutionized the area of neuroscience and technology. Bio-interfaces play a key role in bionic devices such as neural implants for efficient transfer of the signal to smart prosthetics. We report here on the design of a new microelectrode, comprising Carbon Nanofiber (CNF) and a biopolymer, namely carboxymethyl xyloglucan (CMX) hydrogel inside the CNF, which enhances the current density across the interface. Microelectrode was prepared by in-situ cross-linking of CMX inside CNF, with optimized CMX: CNF ratio, resulting in continuous ionic channels confined within the hollow core of CNF. Electron microscopy images of microelectrodes illustrate the formation of CMX hydrogel network inside the CNF hollow core without wrapping its surface. The presence of hydrogel in the CNF was confirmed by Scanning Electron Microscope (SEM) and Transmission Electron Microscopy (TEM). The electrochemical studies indicate the enhancement in charge density as well as the active surface area of the microelectrodes due to the presence of CMX hydrogel network. These microelectrodes have great potential as neural interfaces for designing smart prosthetics with voluntary control.

1 aTorris, Arun1 aBadiger, Manohar, V. uhttp://library.ncl.res.in/content/polysaccharide-hydrogel-incorporated-carbon-nanofiber-microelectrode-designing-neural