Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ 07102, USA.
J Colloid Interface Sci. 2011 Mar 15;355(2):383-8. doi: 10.1016/j.jcis.2010.12.052. Epub 2010 Dec 22.
The colloidal behavior of aqueous dispersions of functionalized multiwall carbon nanotubes (F-CNTS) formed via carboxylation and polymer wrapping with polyvinyl pyrrolidone (PVP) is presented. The presence of polymer on the nanotube surface provided steric stabilization, and the aggregation behavior of the colloidal system was quite different from its covalently functionalized analog. Based on hydrophobicity index, particle size distribution, zeta potential as well as the aggregation kinetics studied using time-resolved dynamic light scattering, the PVP wrapped CNT was somewhat less prone to agglomeration. However, its long-term stability was lower, and this was attributed to the partial unwrapping of the polyvinyl pyrrolidone layer on the CNT surface.
本文介绍了通过羧化和聚合物包裹聚乙烯吡咯烷酮(PVP)形成的功能化多壁碳纳米管(F-CNTS)水相分散体的胶体行为。纳米管表面聚合物的存在提供了空间稳定作用,胶体体系的聚集行为与其共价功能化类似物有很大的不同。基于疏水性指数、粒径分布、Zeta 电位以及使用时间分辨动态光散射研究的聚集动力学,PVP 包裹的 CNT 不太容易聚集。然而,其长期稳定性较低,这归因于 CNT 表面的聚乙烯吡咯烷酮层部分解包裹。