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The aim of this study was to prepare antibacterial cotton fabric using chitosan-silver nanoparticles (CS-AgNPs). CS-AgNPs were used as finishing agent for 100 % pure cotton fabric. AgNPs were prepared by Turkevich method. CSAgNPs were synthesized by mixing chitosan solution with silver nanoparticles. Fourier transform infrared (FTIR) spectrometer technique supported the formulation of CS-AgNPs. Cs-AgNPs crystalline peaks were in perfect agreement with JCPDS card no. 89-3722. Two gram negative bacteria Escherichia coli, Pseudomonas aeruginosa and two gram positive bacteria Bacillus cereus, Staphylococcus aureus were used to test the bacterial efficacy of synthesized AgNPs and CSAgNPs. Scanning electron micrograph of cotton fabric revealed the presence of CS-AgNPs on the surface of cotton fabric. The presence of small amount of silver nanoparticles in the composite was enough to enhance antibacterial activity significantly compared to pure chitosan.

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Graphite was exfoliated to graphene by tip sonic using sodium cholate as a surfactant in the presence of Millipore water as a medium. The use of water as a solvent for exfoliation purposes is very important due to its environmentally friendly nature and almost no cost, contrary to organic media. Two different concentration ratios of surfactants are used in the present work. As a result, graphene dispersions with two different concentrations of 5 mg/ml and about 7 mg/ml respectively were obtained in aqueous media. It was observed that the optimum concentration of surfactant has an effective role in the exfoliation of graphite to graphene. Concentrations of graphene dispersions were studied through UV spectroscopy, while Raman spectroscopy, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) were used to study the quality of the exfoliated graphene flakes.

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A novel nanoporous molecularly imprinting copolymer [Poly(acrylic acid‐co‐acrylonitrile)] membrane (DICMI) has been synthesized by the wet phase inversion method, using D‐Phenylalanine as template, for the optical resolution of amino acid. The membrane prepared is intended for the selective separation of phenylalanine. The racemate solutions of different concentrations (10‐ppm, 50‐ppm, 100‐ppm, and 200‐ppm) were filtered through the membrane fixed in an ultrafiltration kit at 98 kPa pressure to investigate the concentration effect on optical resolution of amino acid using DICMI. Adsorption selectivities of 0.37, 0.45, 0.57, and 0.71 were achieved after 25 ml of filtration of 10‐ppm, 50‐ppm, 100‐ppm, and 200‐ppm racemate solutions respectively. Scanning electron microscopy was used to study the morphological structure of membrane. Chemical structure was studied by Fourier transmission infrared spectroscopy. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers