Size dependent aqueous dispersibility of carboxylated multiwall carbon nanotubes

Susana Addo Ntim, Ornthida Sae-Khow, Chintal Desai, Frank Witzmann, Somenath Mitra

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2772-2779
Number of pages8
JournalJournal of Environmental Monitoring
Volume14
Issue number10
DOIs
StatePublished - Oct 2012

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Carbon Nanotubes
Agglomeration
hydrophobicity
Zeta potential
Hydrophobicity
Hydrophobic and Hydrophilic Interactions
aggregation behavior
Coagulation
Static Electricity
Dispersions
agglomeration
coagulation
electrolyte
Electrolytes
Aspect ratio
Electrostatics
stabilization
Stabilization
carbon nanotube
kinetics

ASJC Scopus subject areas

  • Management, Monitoring, Policy and Law
  • Public Health, Environmental and Occupational Health

Cite this

Size dependent aqueous dispersibility of carboxylated multiwall carbon nanotubes. / Ntim, Susana Addo; Sae-Khow, Ornthida; Desai, Chintal; Witzmann, Frank; Mitra, Somenath.

In: Journal of Environmental Monitoring, Vol. 14, No. 10, 10.2012, p. 2772-2779.

Research output: Contribution to journalArticle

Ntim, Susana Addo ; Sae-Khow, Ornthida ; Desai, Chintal ; Witzmann, Frank ; Mitra, Somenath. / Size dependent aqueous dispersibility of carboxylated multiwall carbon nanotubes. In: Journal of Environmental Monitoring. 2012 ; Vol. 14, No. 10. pp. 2772-2779.
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