Aqueous stability and mobility of C60 complexed by sodium dodecyl benzene sulfonate surfactant
Aqueous stability and mobility of C60 complexed by sodium dodecyl benzene sulfonate surfactant
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十二烷基苯磺酸钠表面活性剂络合C-60的水相稳定性和迁移率
DOI：
10.1016/j.jes.2015.05.026
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发表时间：
2016-04-01
影响因子：
6.9
通讯作者：
Liang, Chuan
中科院分区：
文献类型：
--
作者：
Peng, Xianjia;Yuan, Yue;Liang, Chuan
表面活性剂的络合作用可能对纳米颗粒的环境行为产生显着影响。为了了解纳米材料的生态暴露，重要的是要确定表面活性剂复合的纳米材料在水体系中的稳定性和流动性。本文研究了十二烷基苯磺酸钠（SDBS）与C-60络合后的聚集和迁移行为。发现SDBS络合的C-60具有a.在接近中性的pH条件下的电位为-49.5 mV，并在15天的老化期间保持稳定。其对NaCl的临界凝聚浓度为550 mmol/L，高于普通天然胶体和多种纳米原料，与多种表面改性纳米材料的临界凝聚浓度相当。SDBS的加入提高了C-60胶体的稳定性，但同时也提高了胶体粒子的聚集速率。SDBS络合的C-60比C-60胶体具有更高的迁移率。离子强度、Ca ~（2+）浓度或Al ~（3+）浓度的增加降低了迁移率。总体而言，SDBS络合的C-60具有较高的稳定性和流动性。(C)2015中国科学院生态环境科学研究中心由爱思唯尔公司出版
Surfactant complexation may have significant effects on the environmental behavior of nano-particles. In order to understand the ecological exposure of nano-materials, it is important to determine the stability and mobility of surfactant-complexed nano-materials in aqueous systems. In this study, the aggregation and transport of C-60 complexed by the surfactant sodium dodecyl benzene sulfonate (SDBS) were investigated. It was found that SDBS-complexed C-60 had a.-potential of -49.5 mV under near-neutral pH conditions and remained stable during an aging period of 15 days. It had a critical coagulation concentration of 550 mmol/L for NaCl, which was higher than common natural colloids and many kinds of raw nano-materials, and was comparable to those of many kinds of surface-modified nano-materials. SDBS enhanced the stability of C-60 colloid; however, at the same time, it also enhanced the colloidal particle aggregation rate. Much higher mobility was found for SDBS-complexed C-60 than C-60 colloid. Increase in ionic strength, Ca2+ concentration or Al3+ concentration decreased the mobility. In general, SDBS-complexed C-60 had high stability and mobility. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.