School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
Environ Pollut. 2011 Dec;159(12):3757-62. doi: 10.1016/j.envpol.2011.07.013. Epub 2011 Aug 10.
Aggregation, an important environmental behavior of silver nanoparticles (AgNPs) influences their bioavailability and cytotoxicity. The work studied the influence of dissolved oxygen (DO) or the redox potential on the stability of AgNPs in aqueous environments. This study employed time-resolved dynamic light scattering (TR-DLS) to investigate the aggregation kinetics of citrate-coated AgNPs. Our results demonstrated that when DO was present, the aggregation rates became much faster (e.g., 3-8 times) than those without DO. The hydrodynamic sizes of AgNPs had a linear growth within the initial 4-6 h and after the linear growth, the hydrodynamic sizes became random for AgNPs in the presence of DO, whereas in the absence of DO the hydrodynamic sizes grew smoothly and steadily. Furthermore, the effects of primary particles sizes (20, 40, and 80 nm) and initial concentrations (300 and 600 μg/L) of AgNPs on aggregation kinetics were also investigated.
聚集作用是银纳米粒子（AgNPs）的一种重要环境行为，影响其生物利用度和细胞毒性。本工作研究了溶解氧（DO）或氧化还原电位对 AgNPs 在水相环境中稳定性的影响。该研究采用时间分辨动态光散射（TR-DLS）技术研究了柠檬酸钠包覆的 AgNPs 的聚集动力学。结果表明，当存在 DO 时，AgNPs 的聚集速率比没有 DO 时快得多（例如，快 3-8 倍）。AgNPs 的水动力尺寸在最初的 4-6 小时内呈线性增长，在线性增长后，在有 DO 的情况下，AgNPs 的水动力尺寸变得随机，而在没有 DO 的情况下，AgNPs 的水动力尺寸平稳稳定地增长。此外，还研究了 AgNPs 的初级粒子尺寸（20、40 和 80nm）和初始浓度（300 和 600μg/L）对聚集动力学的影响。
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