El-Sheikh M A
National Research Centre, Textile Research Division, El-Behouth Street, Dokki, P.O. Box 12311, Giza, Egypt.
ScientificWorldJournal. 2014 Jan 29;2014:514563. doi: 10.1155/2014/514563. eCollection 2014.
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.
水溶性光引发剂（PI）4-（三甲基铵甲基）二苯甲酮氯化物首次用于银纳米颗粒（AgNPs）的合成。一种新的绿色合成方法涉及使用PI/紫外光系统、羧甲基淀粉（CMS）、硝酸银和水。提出了通过PI/紫外光系统以及新生醛基将银离子还原为AgNPs的机理。通过AgNPs胶体溶液的紫外可见光谱和透射电子显微镜对合成过程进行了评估。当CMS、PI和AgNO3的浓度分别为10 g/L、1 g/L和1 g/L；温度为40℃；时间为60分钟；pH值为7；料液比为1:20时，吸光度最高。如此获得的AgNPs在室温（约25℃）下在水溶液中三周内保持稳定，并且具有圆形形态。合成的AgNPs尺寸在1-21 nm范围内，这些颗粒中计数百分比最高的分别是6-10 nm和1-3 nm的颗粒。
