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RISS 인기검색어
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- 저자 : Bijan Das (검색결과 4 건)
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De, Ranjit,Lee, Hohjai,Das, Bijan Elsevier 2018 Journal of molecular liquids Vol.251 No.-
<P><B>Abstract</B></P> <P>The counterion condensation in the binary mixtures of like-charged polyelectrolytes with two different molecular weights, where both are negatively charged, has been studied by conductance measurement in aqueous medium. Sodium polystyrenesulfonate with two different chain lengths have been selected as model polyelectrolyte and the investigation has been carried out in the absence of any added salt. The specific conductance-polyelectrolyte concentration data were analyzed in the light of the scaling argument for the conformation of polyion chains in solutions to quantify the fractions of free counterions. Effects of polyelectrolyte concentration, molecular weights of the components of the mixture, and solution temperature on the condensation of counterions have been investigated to explore polyion–counterion interaction, and inter- and intra-chain interactions in these polyelectrolyte mixtures. This investigation revealed that the extent of counterion condensation is significantly influenced by the mixture composition, the polyelectrolyte concentration and the temperature. Evaluation of the polyion transference numbers provided important information as to the direction of the motion of the counterions under the action of the applied electric field.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Counterion condensation in polyelectrolyte (PE) mixtures has been investigated. </LI> <LI> Scaling theory approach has been employed to quantify fraction of free counterions. </LI> <LI> More counterions get condensed in mixtures richer in higher molecular weight PE. </LI> <LI> Counterion condensation grows as the PE concentration and temperature increase. </LI> <LI> Polyion-counterion interactions vary with the composition of the PE mixtures. </LI> </UL> </P>
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T. S Anandh,Bijan Kumar Das,J. Kuttippurath,Arun Chakraborty 한국기상학회 2021 Asia-Pacific Journal of Atmospheric Sciences Vol.57 No.2
This study evaluates the impact of coupled model in simulating the ocean state conditions of Bay of Bengal by comparing standalone and coupled numerical model simulations. The oceanic model is the Regional Ocean Modelling System (ROMS) and the coupled model comprises of ROMS and Weather Research and Forecast modelling system to simulate the oceanic and atmospheric state of the bay. The coupled model is initialized with atmospheric data from Global Data Assimilation System and oceanic data from Estimating the Circulation and Climate of the Ocean (ECCO). The standalone model is initiated with ECCO data and forced by European Centre for Medium RangeWeather Forecasts. The simulations are set with a resolution of 12 km in the ocean and 15 km in the atmosphere for the period 2008–2014, and are compared to reanalysis and measurements. The models are compared for their ability to simulate the sea surface temperature, sea surface salinity, sea level, heat flux, sea level pressure and currents in BOB. With the exchange of atmospheric fluxes and sea surface temperature, the coupled model better captured ocean state representations than the standalone model and, matches well with that of the observations. The simulated temperature shows a warm bias in both simulations at 100–150 m depth. The models are able to simulate the seasonal reversal of boundary currents and associated eddies, and variations in heat fluxes over the ocean. The coupled model provides a better simulation of the ocean state and air–sea interaction which can further be used for climate studies over the bay.
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Pintu Sar,Bidyut Saha,Aniruddha Ghosh,Susanta Malik,Dhiman Ray,Bijan Das 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.42 No.-
Oxidation of the three isomeric pentanols by potassium dichromate in aqueous acidic medium wasinvestigated spectrophotometrically at 25 C. The oxidation leads to the formation of correspondingcarbonyl products as identified by 1H NMR measurement and other techniques. The effects of cationic(cetylpyridinium chloride, CPCl), anionic (sodium dodecylsulphate, NaDS) and nonionic surfactant(polyoxyethylene octyl phenyl ether, TX-100) on reaction kinetics were studied. Moreover the catalyticeffect of surfactant in presence of three heteroaromatic nitrogen bases: 2-picolinic acid (2-PA), 2,20-bipyridyl (2,20-bipy) and 1,10-phenanthroline (1,10-phen) on the oxidation were also investigated. Thevalue of the rate constant in promoted and unpromoted reaction has been found to be higher in NaDSthan in TX-100 and CPCl micellar medium. Conductivity and tensiometry measurements were carried outto determine critical micellization concentration and free energy of micellization (DGm) of the usedsurfactant in presence of three pentanols. Among the different surfactant and promoter the combinationof 2,20-bipy and NaDS is efficient to exhibit1000 fold rate enhancement for oxidation of 1-pentanol andit is ‘selective’ over the rest of two pentanols oxidation.
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