%0 Journal Article %T One Step Photopolymerization of N, N-Methylene Diacrylamide and Photocuring of Carboxymethyl Starch-Silver Nanoparticles onto Cotton Fabrics for Durable Antibacterial Finishing %A M. A. El-Sheikh %A H. M. Ibrahim %J International Journal of Carbohydrate Chemistry %D 2014 %I Hindawi Publishing Corporation %R 10.1155/2014/380296 %X The PI/UV system ((4-trimethyl ammonium methyl) benzophenone chloride/UV) was used to synthesize carboxymethyl starch- (CMS-) stabilized silver nanoparticles (AgNPs). AgNPs so prepared had round shape morphology with size of 1¨C7£¿nm. The prepared AgNPs were utilized to impart antibacterial finishing for cotton fabrics. The PI/UV system was further utilized to fix AgNPs onto cotton fabrics by photocrosslinking of AgNPs-CMS composite onto cotton fabrics to impart durable antibacterial properties. Effect of irradiation time and incorporating N, N-methylene diacrylamide (MDA) in different concentrations on antibacterial performance before and after repeated washing cycles was studied. S. aureus and E. coli were used to evaluate the antibacterial performance of finished fabrics. The antibacterial performance was directly proportional to the irradiation time and concentration of MDA but inversely proportional to the number of washing cycles. The inhibition zone of S. aureus and E. coli is the same although they are different in the cell wall structure and mode of action due to the nanosize structure formed. 1. Introduction Metal nanoparticles can be prepared and stabilized by physical and chemical methods; the chemical approach, such as chemical reduction, electrochemical techniques, and photochemical reduction, is most widely used [1, 2]. In the global efforts to reduce generated hazardous waste, ¡°green¡± synthesis of AgNPs is progressively integrating with modern developments in science and industry. This ¡°green¡± synthesis is geared to guide in minimizing the use of unsafe reactants and maximizing the efficiency of synthesis process. AgNPs were green synthesized using different techniques [3¨C13]. Direct photoreduction and photosensitization are powerful approaches for the in situ synthesis in polymer matrixes [14¨C22]. The heart of the photochemical approach is the generation of M0 in such conditions that their precipitation is thwarted. Ag0 can be formed through direct photoreduction of a silver source or reduction of silver ions using photochemically generated intermediates, such as radicals. The key step of the process is the reaction of silver cations with photogenerated transient species that are able to reduce them to silver metal atoms. Two classes of photoinduced reactions were used to produce these primary radicals. The first is based on the reaction of an electron rich molecule (ether, thiol, amine, ¡­) with the highly oxidant triplet state of a sensitizer excited upon absorption of the actinic photons. The second involves the direct hemolytic %U http://www.hindawi.com/journals/ijcc/2014/380296/