%0 Journal Article
%T Photosynthesis of Carboxymethyl Starch-Stabilized Silver Nanoparticles and Utilization to Impart Antibacterial Finishing for Wool and Acrylic Fabrics
%A M. A. El-Sheikh
%A L. K. El Gabry
%A H. M. Ibrahim
%J Journal of Polymers
%D 2013
%R 10.1155/2013/792035
%X The water soluble photoinitiator (PI) 4-(trimethyl ammonium methyl) benzophenone chloride/UV system is used in the synthesis of silver nanoparticles (AgNPs). Green synthesis method involved using PI/UV system, carboxymethyl starch (CMS), silver nitrate, and water. AgNPs obtained had a spherical shape morphology and a size of 1¨C7£¿nm. To impart antibacterial properties, wool and acrylic fabrics were treated with AgNPs obtained. The PI/UV system was further utilized to fix AgNPs onto wool and acrylic fabrics by photocrosslinking to impart durable antibacterial properties. The effect of irradiation time on the antibacterial performance before and after repeated washing cycles was studied. S. aureus (as G +ve) and E. coli (as G £¿ve) were used to estimate the antibacterial performance of the finished fabrics. The antibacterial performance was directly proportional to the irradiation time but inversely proportional to the number of washing cycles. However, after the 15th washing cycle, samples still have bacteriostatic effect; that is, although they show zero inhibition zone, they cannot be attacked by the bacterial growth and do not inhibit the bacterial growth. AgNPs finished wool fabrics showed more antibacterial activity than those of AgNPs finished acrylic fabrics. 1. Introduction It is well known that silver exhibits effective antibacterial properties with low toxicity for humans and animals compared with other heavy metals and some organic antibacterial agents. Silver and silver compounds are effective for both Gram £¿ve and Gram +ve bacteria, whereas the efficiency of conventional antibiotics varies with the species of bacteria [1]. Using AgNPs leads to increasing the number of particles per unit area, and, thus, antibacterial effects can be maximized [2]. 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 [3, 4]. 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 [5¨C14]. Direct photoreduction and photosensitization are powerful approaches for the in situ synthesis in polymer matrixes [15¨C21]. The heart of the photochemical approach is the generation of M0 (metal NPs) in such conditions that
%U http://www.hindawi.com/journals/jpol/2013/792035/