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Satheeshkumar, Chinnadurai,Yu, Hyun Jung,Park, Hyojin,Kim, Min,Lee, Jong Suk,Seo, Myungeun The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.44
<P>We developed a facile methodology for fabricating a free-standing mixed-matrix membrane (MMM) containing covalently incorporated metal-organic framework (MOF) particles up to 60 wt% by utilizing thiol-ene photopolymerization with the MOF consisting of vinyl functionality. Vinyl-functionalized UiO-66 (UiO-66-CHCH2) was synthesized from 2-vinyl-1,4-dicarboxylic acid with ZrCl4, and a free-standing MMM was readily produced by irradiation of a polymerization mixture containing UiO-66-CHCH2, poly(ethylene glycol) divinyl ether (PEO-250), pentaerythritol tetra(3-mercaptopropionate) (PETM), 2,2′-(ethylenedioxy)diethanethiol (EDDT), and 2,2-dimethoxy-2-phenylacetophenone (DMPA) as a photoradical initiator. Assorted analyses combining FTIR, thermogravimetric analysis, scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction strongly supported the fact that the desired MMM containing well-dispersed UiO-66-CHCH2 particles was successfully produced by C-S bond formation, which provided strong union of the MOF with the polymer matrix without interfacial voids. The produced MMM was highly flexible and showed improved mechanical properties as compared to the pristine polymeric membrane, indicating that the covalently immobilized UiO-66-CHCH2 particles were homogeneously distributed in the polymer matrix. Gas permeability across the MMM was significantly enhanced compared with the pristine polymeric membrane as diffusion of the gas molecules was facilitated in the porous space in the MOF.</P>
Synthesis, anti-microbial activity and molecular docking studies on triazolylcoumarin derivatives
SATHEESHKUMAR, CHINNADURAI,RAVIVARMA, MAHALINGAM,ARJUN, PANDIAN,SILAMBARASAN, VAITHIYANATHAN,RAAMAN, NANJIAN,VELMURUGAN, DEVADASAN,SONG, CHANGSIK,RAJAKUMAR, PERUMAL Springer-Verlag 2015 Journal of chemical sciences Vol.127 No.3
Creation of micropores by RAFT copolymerization of conjugated multi-vinyl cross-linkers
Satheeshkumar, Chinnadurai,Seo, Myungeun The Royal Society of Chemistry 2018 Polymer chemistry Vol.9 No.48
<P>We report a new methodology that allows for forming micropores in hierarchically porous polymers by employing the reversible addition-fragmentation chain transfer (RAFT) copolymerization of conjugated multi-vinyl cross-linkers with styrene. Using divinylbenzene, 4,4′-divinylbiphenyl, 1,3,5-tris(4-vinylphenyl)benzene and tetrakis(4-vinylbiphenyl)methane as cross-linkers, the RAFT copolymerization was carried out in the presence of polylactide macro-chain transfer agents. During the polymerization, microphase separation occurred spontaneously to produce cross-linked block polymer precursors with a bicontinuous morphology composed of polylactide and cross-linked polystyrene microdomains. Hierarchically porous polymers with strong fluorescence were successfully derived by polylactide etching. We demonstrate that the rigid conjugated structure of the cross-linkers with a high cross-linking density is critical for creating the micropores and for stabilizing the mesopores that are templated by the polylactide domain.</P>
Palanisamy Satheeshkumar,Anisa Basheer Khan 한국해양과학기술원 2012 Ocean science journal Vol.47 No.1
Seasonal variation in the distribution of mollusks in relation to environmental parameters was studied at four mangrove stations on the Pondicherry coast during September 2008-August 2009. A total of 37 species of molluscs were recorded, among them 16 species of bivalves belonging to 7 families and 12 Genera, and 21 species of gastropods belonging to 14 families and 19 Genera, with the Cereithedia cingulata being the dominant group. An increase of species density and diversity in the Post monsoon season was observed, with the highest values for both indexes at stations 1 and 2, and the lowest at stations 3 and 4 fine where the sand assemblage was dominated by a few gastropods. Pollution indicator species Cassidula nucleus, Melampus ceylonicus, Sphaerassiminea minuta were found only in highly polluted regions near stations 3 and 4; they were totally absent in moderately polluted areas near stations 1 and 2. From a stepwise multivariate analysis of the different environmental parameters regarding molluscan density, it was found that in all 10 parameters govern the density variation of benthic mollusks in Pondicherry mangroves and that the organic matter of sediment and sulphide, DO, and salinity were the highly significant ones.
M. Satheeshkumar,M.R. Thansekhar,R. Pandiyarajan 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.6
The increasing need for development in microelectronics and systems has naturally led to pursuit of modern advancementsin the field of cooling technology. Microchannels offer excellent high temperature heat management in electronic systems. Microchannels utilize fluids capable of transferring heat energy released by the operating circuits by fluid flow. The fluid flowand nature of fluid are highly resonant on the performance of the microchannel heat sinks. The present work is a novelapproach of an investigation of three-dimensional ceramic based nanofluids flow performance in a fabricated wavymicrochannel heat sink with varying inlet header geometry. The coolant nanofluids investigated are concentrated with silicondioxide (SiO2) and aluminum oxide (Al2O3) ceramic nanoparticles with varying volume percentages and their hydraulic andthermal performance were investigated. Experimental evaluations were performed to determine variations in local Nusseltnumber and axial coefficient of heat transfer for SiO2 and Al2O3 nanoparticles concentration. Computational fluid analysis wasperformed to evaluate transport equations to determine pressure drop, friction factor and Nusselt number of the fluid flow. It was observed that increasing heat flux amplitude causes rise of local maxima of Nusselt number with corresponding decreaseof the local minima. The decrease of local minima was more profound than increase of local maxima. The different inlet headergeometries influence the local Nusselt number with conical frustum header producing the value followed by semi-circular,rectangular and triangular inlet section geometries. The observed Nusselt number and heat transfer rate was highest in caseof Al2O3 followed by SiO2 and distilled water as coolant fluids for the heat sink. Higher Nusselt number was observed forconical frustum and semi-circular inlet header geometries when SiO2 and Al2O3 based coolant fluids were used. High frictionfactor was observed when the nanoparticle concentration was 0.25 volume percentage for the entire Reynolds number underinvestigation. A computational model was utilized to evaluate the drops in pressure in the wavy microchannel and determinefrictional characteristics of the nanofluids in the present work.