title: A novel photosynthesis of carboxymethyl starch-stabilized silver nanoparticles.
abstract: The water soluble photoinitiator (PI) 4-(trimethyl ammonium methyl) benzophenone chloride is used for the first time in the synthesis of silver nanoparticles (AgNPs). A new green synthesis method involves using PI/UV system, carboxymethyl starch (CMS), silver nitrate, and water. A mechanism of the reduction of silver ions to AgNPs by PI/UV system as well as by the newly born aldehydic groups was proposed. The synthesis process was assessed by UV-vis spectra and TEM of AgNPs colloidal solution. The highest absorbance was obtained using CMS, PI and AgNO3 concentrations of 10 g/L, 1 g/L, and 1 g/L, respectively; 40 °C; 60 min; pH 7; and a material : liquor ratio 1 : 20. AgNPs so-obtained were stable in aqueous solution over a period of three weeks at room temperature (~25 °C) and have round shape morphology. The sizes of synthesized AgNPs were in the range of 1-21 nm and the highest counts % of these particles were for particles of 6-10 and 1-3 nm, respectively.
authors.affiliation: National Research Centre, Textile Research Division, El-Behouth Street, Dokki, P.O. Box 12311, Giza, Egypt.
authors.forename: M A
authors.initials: MA
authors.lastname: El-Sheikh
mesh_terms: D053768:Metal Nanoparticles / Q000737:chemistry*; D010788:Photosynthesis; D012834:Silver / Q000737:chemistry*; D013213:Starch / Q000031:analogs & derivatives* / Q000737:chemistry
chemical_list: D012834:Silver; D013213:Starch; C034848:carboxymethyl starch