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

Susana Addo Ntim; Ornthida Sae-Khow; Frank A. Witzmann; Somenath Mitra

doi:10.1016/j.jcis.2010.12.052

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

Susana Addo Ntim, Ornthida Sae-Khow, Frank A. Witzmann, Somenath Mitra

Research output: Contribution to journal › Article › peer-review

133 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	383-388
Number of pages	6
Journal	Journal of Colloid And Interface Science
Volume	355
Issue number	2
DOIs	https://doi.org/10.1016/j.jcis.2010.12.052
State	Published - Mar 15 2011

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Biomaterials
Surfaces, Coatings and Films
Colloid and Surface Chemistry

Keywords

Aggregation
Carbon nanotubes
Hydrophobicity
Stability

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10.1016/j.jcis.2010.12.052

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title = "Effects of polymer wrapping and covalent functionalization on the stability of MWCNT in aqueous dispersions",

abstract = "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.",

keywords = "Aggregation, Carbon nanotubes, Hydrophobicity, Stability",

author = "Ntim, {Susana Addo} and Ornthida Sae-Khow and Witzmann, {Frank A.} and Somenath Mitra",

note = "Funding Information: This work was funded by the National Institute of Environmental Health Sciences (NIEHS) under Grant Number RC2 ES018810. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the NIEHS. Partial support for this work was also provided by the Schlumberger Foundation Faculty for the Future Fellowship. ",

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doi = "10.1016/j.jcis.2010.12.052",

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AU - Ntim, Susana Addo

AU - Sae-Khow, Ornthida

AU - Witzmann, Frank A.

AU - Mitra, Somenath

N1 - Funding Information: This work was funded by the National Institute of Environmental Health Sciences (NIEHS) under Grant Number RC2 ES018810. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the NIEHS. Partial support for this work was also provided by the Schlumberger Foundation Faculty for the Future Fellowship.

PY - 2011/3/15

Y1 - 2011/3/15

N2 - 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.

AB - 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.

KW - Aggregation

KW - Carbon nanotubes

KW - Hydrophobicity

KW - Stability

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

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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