Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
Mater Sci Eng C Mater Biol Appl. 2014 May 1;38:192-6. doi: 10.1016/j.msec.2014.01.041. Epub 2014 Jan 31.
Radiolytic reduction of Ag(+) ions and the subsequent formation of Ag clusters were studied in aqueous citrate solutions. Pulse-radiolysis studies show that the presence of citrate in the solution affects the early processes, via complexation of Ag(+) ions with the carboxyl moieties of the citrate. The ratio of citrate to Ag(+) determines the kinetic consequences of the reduction and agglomeration processes. The complexation reduces somewhat the rate of reduction by hydrated electrons. However, when all the ions are complexed to the citrate, the surface plasmon absorption band becomes broader, albeit small, but nevertheless it provides extreme stability to the formed nanoparticles.
在含有柠檬酸盐的水溶液中研究了银（+）离子的辐射还原和随后形成的银簇。脉冲辐射研究表明，溶液中柠檬酸盐的存在通过与柠檬酸盐的羧基部分络合来影响早期过程。柠檬酸盐与银（+）的比例决定了还原和聚集过程的动力学后果。络合略微降低了水合电子还原的速度。然而，当所有离子都与柠檬酸盐络合时，表面等离子体吸收带变得更宽，尽管很小，但为形成的纳米颗粒提供了极端稳定性。
