Beijing National Laboratory for Molecular Sciences, Key Laboratory for the Physics and Chemistry of Nanodevices, State Key Laboratory of Rare Earth Materials, Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Nanoscale. 2016 Aug 14;8(30):14587-92. doi: 10.1039/c6nr03503e. Epub 2016 Jul 19.
Graphene oxide (GO), as a typical two-dimensional material, possesses a range of oxygen-containing groups and shows surfactant and/or polyelectrolyte-like characteristics. Herein, GO sheets with narrow size distribution were prepared by an ultracentrifugation-based process and the aggregation behaviour of GO in pure water and an electrolyte aqueous solution were studied using laser light scattering (LLS). When adding common electrolytes, such as NaCl and MgCl2, into the GO dispersions, aggregation occurs and irreversible coagulation eventually occurs too. However, the GO dispersion can still remain stable when adding excess AlCl3. The zeta potential of the GO dispersion changes from negative to positive after the addition of access AlCl3, indicating that electrostatic repulsion is still responsible for the dispersion of GO, which is in good agreement with the LLS results. This finding on the dispersion of GO may be applied in the solution processing of GO. It also expands the scope of the design and preparation of new GO-based hybrid materials with different functions.
氧化石墨烯（GO）作为一种典型的二维材料，具有一系列含氧基团，表现出表面活性剂和/或聚电解质的特性。本文采用基于超离心的方法制备了具有较窄尺寸分布的 GO 片，并采用激光光散射（LLS）研究了 GO 在纯水中和电解质水溶液中的聚集行为。当向 GO 分散体中加入常见电解质，如 NaCl 和 MgCl2 时，会发生聚集，最终也会发生不可逆的凝聚。然而，当加入过量的 AlCl3 时，GO 分散体仍能保持稳定。加入过量 AlCl3 后，GO 分散体的动电位从负变为正，表明静电排斥仍然是 GO 分散的原因，这与 LLS 的结果一致。GO 分散体的这一发现可能适用于 GO 的溶液加工。它还扩展了设计和制备具有不同功能的新型基于 GO 的混合材料的范围。
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