Agnos College of Technology, Bhopal, India.
J Colloid Interface Sci. 2011 Feb 1;354(1):190-5. doi: 10.1016/j.jcis.2010.10.046. Epub 2010 Oct 26.
Spectrophotometric, kinetic, and transmission electron microscopic (TEM) data for the formation of Ag-nanoparticles using aspartic acid (Asp) as reductant are reported for the first time. In the formation of transparent silver sols, an alkaline medium is required. The silver nanoparticles are spherical, uniform particle size, and strongly depend on the [Asp]. The apparent rate constant decreases with [Asp] (from 4.0 to 24.0×10(-4)moldm(-3), the rate constants decreased from 2.6×10(-4) to 0.3×10(-4)s(-1)). For a certain reaction time, i.e., 30min, the absorbance of the silver sol first increased until it reached a maximum, and then decreased with [Asp]. Kinetic and TEM results indicate that the size of the Ag-nanoparticles depends on the [Asp]. It is proposed that the oxidation of Asp occurs by the adsorbed Ag(+) ions on the surface of Ag(2)O particles.
首次报道了使用天冬氨酸（Asp）作为还原剂形成银纳米粒子的分光光度法、动力学和透射电子显微镜（TEM）数据。在透明银溶胶的形成中，需要碱性介质。银纳米粒子为球形，粒径均匀，强烈依赖于[Asp]。表观速率常数随[Asp]降低（从 4.0 到 24.0×10(-4)moldm(-3)，速率常数从 2.6×10(-4)降低到 0.3×10(-4)s(-1)）。对于一定的反应时间，即 30min，银溶胶的吸光度先增加，直到达到最大值，然后随[Asp]降低。动力学和 TEM 结果表明，Ag-纳米粒子的尺寸取决于[Asp]。据推测，Asp 的氧化是由吸附在 Ag2O 颗粒表面的 Ag(+)离子引起的。
