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Kim, Ju-Young,Mulmi, Suresh,Lee, Chang-Hyun,Lee, Young-Moo,Ihn, Kyo-Jin Wiley Subscription Services, Inc., A Wiley Company 2008 Journal of applied polymer science Vol.107 No.4
<P>Microphase-separated poly(styrene-co-sodium styrene sulfonate) random copolymer (PSSU) membranes were fabricated through a new copolymerization process. Two immiscible monomers, styrene and sodium styrene sulfonate were dissolved in a single solvent and formed homogeneous solutions, which were directly converted to wall-to-wall membranes via radical copolymerization process with microphase separation. Since urethane acrylate nonionomer (UAN) chain has amphiphilicity as well as reactivity with vinyl monomers, UAN chain could act not only as compatibilizer for polystyrene and poly(sodium styrene sulfonate), but also as macrocrosslinker, which makes it possible for the formation of crosslinked copolymer of two immiscible polymers without macrophase separation. TEM image of the PSSU membranes showed that nanosized hydrophilic domains formed by hydrophilic/hydrophobic microphase separation were dispersed at hydrophobic matrix phase. PSSU membranes fabricated using UAN chain having longer chain length of polyethylene oxide showed bigger size of hydrophilic domains, which was also confirmed by TEM images. Fabricated PSSU membranes showed proton conductivity higher than 10<SUP>−2</SUP> S/cm and methanol permeability lower than 10<SUP>−7</SUP> cm<SUP>2</SUP>/s of Nafion® 117 membranes. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2008</P>
Panthi, Gopal,Ranjit, Rosa,Kim, Hak-Yong,Mulmi, Deependra Das Elsevier 2018 Optik Vol.156 No.-
<P><B>Abstract</B></P> <P>Present study reports the synthesis of Ag<SUB>3</SUB>PO<SUB>4</SUB> nano/mircoparticles by facile precipitation and colloidal synthesis approach in aqueous solution. Importantly, the presented approach does not require complicated instruments, difficult processes, and harsh conditions such as high temperature and high pressure. The obtained samples were characterized using SEM with EDS, XRD, TEM with HR-TEM and SAED, and FTIR. Their optical properties were studied using UV–vis diffusive reflectance spectra. Size dependent antibacterial activity towards Gram-positive (S. aureus) and Gram-negative (E. coli, K. pneumoniae and P. aeruginosa) bacteria. Experimental results showed that the antibacterial performances of nanoparticles obtained by mixing 0.01M of each reactant (colloidal synthesis approach) were found to be much higher than that of other formulation under identical conditions.</P>