Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 355, Issue 2, Pages 383-388Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2010.12.052
Keywords
Carbon nanotubes; Hydrophobicity; Aggregation; Stability
Categories
Funding
- National Institute of Environmental Health Sciences (NIEHS) [RC2 ES018810]
- Schlumberger Foundation Faculty
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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.
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