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对表面形态,分层结构和表面活性剂稳定石墨烯分散的聚合动态的分子见解
Shangchao Lin1, Chih-Jen Shih, Michael S Strano
1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
Journal of the American Chemical Society
|July 9, 2011
概括
研究人员开发了一种分子模拟和建模方法,以了解溶液中的石墨烯分散. 这种方法有助于控制石墨烯分层和功能化,用于先进的电子设备.
科学领域:
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
- 纳米技术 纳米技术
背景情况:
- 电子产品的石墨烯生产需要受控的分层 (二层/三层) 或功能化.
- 溶液相分散是可打印电子产品和纳米复合材料的关键.
- 挑战包括控制形态,减少流层层,改善分散稳定性.
研究的目的:
- 为了应对在分子水平上石墨烯分散的挑战.
- 了解表面活性剂在石墨烯分散和分层中的作用.
- 开发石墨烯聚合和质量评估的预测模型.
主要方法:
- 结合了分子模拟,理论建模和实验测量.
- 在胆酸盐溶液中探测了石墨烯表面结构和静电潜力.
- 对于石墨烯-表面活性剂相互作用的平均力 (PMF) 的计算潜力.
- 开发了用于合体聚合的动力模型.
主要成果:
- 在石墨烯板上确定负电荷的酸盐离子,影响功能化.
- 由于表面活性剂的硬质阻碍,证实了转移稳定的双层石墨烯的形成.
- 发现DLVO理论不足;硬质障碍占主导地位.
- 突出了表面活性剂的困境:稳定与防止所需的聚合.
结论:
- 分子模拟和建模为石墨烯分散机制提供了洞察力.
- 表面活性剂的固体阻碍在石墨烯相互作用中起着至关重要的作用.
- 动力聚合模型可以预测应用程序的石墨烯分散质量.
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