ESC Institute of Biology, Taras Shevchenko National University of Kyiv, Kyiv 01601, Ukraine.
Phys Chem Chem Phys. 2013 Jun 21;15(23):9351-60. doi: 10.1039/c3cp50187f. Epub 2013 May 10.
In the present work we develop a novel approach for quantification of the energetics of C60 fullerene aggregation in aqueous media in terms of equilibrium aggregation constant KF. In particular, it is shown that the experimental determination of the magnitude of KF is possible only within the framework of the 'up-scaled aggregation model', considering the C60 fullerene water solution as a solution of fullerene clusters. Using dynamic light scattering (DLS) data we report the value, K(F) = 56,000 M(-1), which is in good agreement with existing theoretical estimates and the results of energetic analyses. It is suggested that the proposed 'up-scaled model' may be used in any instances of non-specific aggregation resulting in formation of large spherical particles. The measurement of the translational diffusion coefficient and the dimensions of the light scattering particles using a DLS approach with respect to C60 fullerene aggregates is found to contain significant systematic errors originating from the interaction effect that is well-known for micellar solutions. As a result, corrections to the equations associated with DLS data are proposed.
在本工作中，我们开发了一种新的方法，用于根据平衡聚集常数 KF 定量评估 C60 富勒烯在水介质中的聚集能。特别地，结果表明，只有在“放大聚集模型”的框架内，才有可能确定 KF 的大小，此时将 C60 富勒烯水溶液视为富勒烯簇的溶液。利用动态光散射 (DLS) 数据，我们报告了 K(F) = 56,000 M(-1)的值，这与现有的理论估计和能量分析结果非常吻合。建议可以在任何导致形成大球形颗粒的非特异性聚集的情况下使用所提出的“放大模型”。使用 DLS 方法测量 C60 富勒烯聚集体的平移扩散系数和光散射颗粒的尺寸时，发现由于众所周知的胶束溶液的相互作用效应，存在显著的系统误差。因此，提出了与 DLS 数据相关的方程的修正。
