Size dependent aqueous dispersibility of carboxylated multiwall carbon nanotubes

被引：22

作者：

Ntim, Susana Addo ^{[1
]}

Sae-Khow, Ornthida ^{[1
]}

Desai, Chintal ^{[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, Dept Cellular & Integrat Physiol, Biotechnol Res & Training Ctr, Indianapolis, IN 46202 USA

来源：

JOURNAL OF ENVIRONMENTAL MONITORING | 2012年 / 14卷 / 10期

关键词：

SILICA NANOPARTICLES; FUNCTIONALIZATION; CYTOTOXICITY; PARTICLES; PURIFICATION; SUSPENSIONS; CELLS; WATER;

D O I：

10.1039/c2em30405h

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The size dependent colloidal behavior of aqueous dispersions of carboxylated multiwall carbon nanotubes (c-MWCNTs) is presented. The presence of carboxylic groups provided electrostatic stabilization in water, where the size affected agglomeration. While aspect ratio did not show any definite correlation, the hydrophobicity indices (HI), zeta potential and aggregation kinetics showed dependence on the length of the c-MWCNTs where the shorter c-MWCNTs showed significantly lower HI values, smaller particle aggregates, higher zeta potential values and higher critical coagulation concentrations (ccc) in the presence of electrolytes. Although the diameter of the short c-MWCNTs did not appear to influence their aggregation behavior, the longer c-MWCNTs showed a dependence on diameter where stability decreased with increasing CNT diameter.

引用

页码：2772 / 2779

页数：8

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