%0 Journal Article
%T Green Synthesis of Hydroxyethyl Cellulose-Stabilized Silver Nanoparticles
%A M. A. El-Sheikh
%A S. M. El-Rafie
%A E. S. Abdel-Halim
%A M. H. El-Rafie
%J Journal of Polymers
%D 2013
%R 10.1155/2013/650837
%X Green synthesis aims to minimize the use of unsafe reactants and maximize the efficiency of synthesis process. These could be achieved by using environmentally compassionate polymers and nontoxic chemicals. Hydroxyethyl cellulose (HEC), an ecofriendly polymer, was used as both reducing and stabilizing agents in the synthesis of stable silver nanoparticles, while silver nitrate was used as a precursor and water as a solvent. The formation of silver nanoparticles was assessed by monitoring UV-vis spectra of the silver colloidal solution. The size of the nanoparticles was measured using transmission electron microscope (TEM). Reaction kinetics was followed by measuring the absorbance of silver colloidal solution at different time intervals. Optimum reaction conditions revealed that the highest absorbance was obtained using HEC£¿:£¿AgNO3 of 1.5£¿:£¿0.17 (g/100£¿cm3) at 70¡ãC for 120£¿min at pH 12. The Ag0 nanoparticles colloidal solution so obtained (1000£¿ppm) were found stable in aqueous solution over a period of six months at room temperature ( ¡ãC). The sizes of these nanoparticles were found in the range of 11¨C60£¿nm after six months of storing. FTIR spectra confirmed the interaction of both the aldehyde and OH groups in the synthesis and stabilization of silver nanoparticles. 1. Introduction Nanotechnology is an enabling technology which deals with structures ranging from approximately 1 to 100£¿nm in at least one dimension. The nanosize results in specific physicochemical characteristics that may differ from those of the bulk substance or particles of larger size. This effect is mainly attributed to high surface area to volume ratio, which potentially results in high reactivity. Because of these specific characteristics, the use of substances in nanoform may have advantages over the use of bulk chemicals. Silver has been used since ancient times for jewelry, utensils, monetary and currency, dental alloy, photography, explosives, and so forth. Until the introduction of antibiotics, silver was also used for its antiseptic activity, specifically in the management of open wounds and burns. While an antibiotic can kill as many as a half-dozen different kinds of disease organisms, silver is known to kill 650 species of bacteria or viruses simply by coming into contact with them. Due to its antimicrobial properties, silver has also been used in medical textile applications [1¨C4] and incorporated in filters to purify drinking water and clean swimming pool water. Particle size has been the only limiting factor to silver¡¯s effectiveness [5]. Ag/Al2O3 catalysts are used
%U http://www.hindawi.com/journals/jpol/2013/650837/