Comparison of electrokinetic properties of colloidal fullerenes (n-C60) formed using two procedures
Comparison of electrokinetic properties of colloidal fullerenes (n-C60) formed using two procedures
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DOI：
10.1021/es050090d
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发表时间：
2005-09-01
影响因子：
11.4
通讯作者：
Wiesner, M
中科院分区：
文献类型：
--
作者：
Brant, J;Lecoanet, H;Wiesner, M
在这项研究中，我们报告了C(60)富勒烯(n-C-60)胶体聚集体(n-C-60)通过两种不同的技术产生的电动行为：溶剂交换和与水的扩展混合。在第一种技术中，在最近的几项毒性和传输研究中用于生产胶体材料，在与水混合之前，使用四氢呋喃(THF)等有机溶剂来溶解C-60。第二种技术更能反映自然水生系统中可能出现的条件。这两种类型的n-C-60在不同的溶液化学条件下都带负电荷；但是，用四氢呋喃形成的n-C-60带电更强。我们得出结论，n-C-60可能通过有机溶剂(如果存在)的电荷转移和表面水解反应获得电荷。然而，C-60能够获得电荷并以n-C-60的形式分散在水中，而不需要有机溶剂的帮助，这一途径可能对确定富勒烯在自然体系中的流动性很重要。这些发现还表明，使用THIP制备的n-C-60保留了团簇结构中的部分溶剂，从而影响了n-C-60的特性，并可能需要重新解释最近使用四氢呋喃衍生材料对n-C-60毒性的研究结果。
In this study we report on the electrokinetic behavior of colloidal aggregates of C(60)fullerenes (n-C-60) produced through two different techniques: solvent exchange and extended mixing with water. In the first technique, used to produce colloidal materials in several recent toxicity and transport studies, an organic solvent such as tetrahydrofuran (THF) is used to dissolve the C-60 before mixing with water. The second technique is more indicative of conditions that might occur in natural aquatic systems. Both types of n-C-60 were observed to be negatively charged under a variety of solution chemistries; however, the n-C-60 formed using THF was more strongly charged. We conclude that n-C-60 likely acquires charge through charge transfer from the organic solvent (when present) and surface hydrolysis reactions. Nevertheless, C-60 is capable of acquiring charge and becoming dispersed as n-C-60 in water without the aid of organic solvents, a pathway that may be important in determining the mobility of fullerenes in natural systems. These findings also show that n-C-60 made using THIP retains a portion of the solvent in the cluster structure, subsequently influencing the characteristics of the n-C-60 and possibly requiring a re-interpretation of results from recent studies on n-C-60 toxicity using THF-derived materials.