Effects of polymer wrapping and covalent functionalization on the stability of MWCNT in aqueous dispersions

被引：112

作者：

Ntim, Susana Addo ^{[1
]}

Sae-Khow, Ornthida ^{[1
]}

Witzmann, Frank A. ^{[2
]}

Mitra, Somenath ^{[1
]}

机构：

[1] New Jersey Inst Technol, Dept Chem & Environm Sci, Newark, NJ 07102 USA

[2] Indiana Univ, Sch Med, Biotechnol Res & Training Ctr, Dept Cellular & Integrat Physiol, Indianapolis, IN 46202 USA

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2011年 / 355卷 / 02期

关键词：

Carbon nanotubes; Hydrophobicity; Aggregation; Stability; WALLED CARBON NANOTUBES; PURIFICATION; WATER; SUSPENSIONS;

D O I：

10.1016/j.jcis.2010.12.052

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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. (C) 2010 Elsevier Inc. All rights reserved.

引用

页码：383 / 388

页数：6

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