Characterization of the electric double layers of multi-walled carbon nanotubes, laponite and nanotube+laponite hybrids in aqueous suspensions

Maryna Manilo, Nikolai Lebovka, S. Bárány

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

To characterize the electric double layers (EDLs) of multi-walled carbon nanotubes (NTs), laponite clay disks and NT+laponite hybrid particles, their electrophoretic mobility was investigated as a function of pH and concentration of electrolytes (KCl, CaCl2 and AlCl3). The electrokinetic behaviour of NTs resembles that of the lyophobic colloids. An increase in pH from 2 to 12 resulted in substantial increase of the absolute (negative) values of the electrophoretic mobility of NTs due to dissociation of surface hydroxyl and carbonyl groups, which was identified by infra-red (IR) spectroscopy. The observed attraction between similarly charged colloidal particles of NTs and laponite was explained by the highly heterogeneous distribution of negatively charged functional groups on the surface of NTs and difference in electrophoretic mobility of NT and laponite particles.

Original languageEnglish
Pages (from-to)211-216
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume462
DOIs
Publication statusPublished - Nov 1 2014

Fingerprint

Carbon Nanotubes
Nanotubes
Carbon nanotubes
nanotubes
Suspensions
carbon nanotubes
Electrophoretic mobility
electrokinetics
Colloids
Hydroxyl Radical
Functional groups
Electrolytes
clays
attraction
colloids
laponite
Infrared spectroscopy
Clay
infrared spectroscopy
electrolytes

Keywords

  • Carbon nanotubes
  • Electrolytes
  • Electrophoretic mobility
  • Laponite clay disks
  • PH
  • Surface groups

ASJC Scopus subject areas

  • Colloid and Surface Chemistry

Cite this

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abstract = "To characterize the electric double layers (EDLs) of multi-walled carbon nanotubes (NTs), laponite clay disks and NT+laponite hybrid particles, their electrophoretic mobility was investigated as a function of pH and concentration of electrolytes (KCl, CaCl2 and AlCl3). The electrokinetic behaviour of NTs resembles that of the lyophobic colloids. An increase in pH from 2 to 12 resulted in substantial increase of the absolute (negative) values of the electrophoretic mobility of NTs due to dissociation of surface hydroxyl and carbonyl groups, which was identified by infra-red (IR) spectroscopy. The observed attraction between similarly charged colloidal particles of NTs and laponite was explained by the highly heterogeneous distribution of negatively charged functional groups on the surface of NTs and difference in electrophoretic mobility of NT and laponite particles.",
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AU - Lebovka, Nikolai

AU - Bárány, S.

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N2 - To characterize the electric double layers (EDLs) of multi-walled carbon nanotubes (NTs), laponite clay disks and NT+laponite hybrid particles, their electrophoretic mobility was investigated as a function of pH and concentration of electrolytes (KCl, CaCl2 and AlCl3). The electrokinetic behaviour of NTs resembles that of the lyophobic colloids. An increase in pH from 2 to 12 resulted in substantial increase of the absolute (negative) values of the electrophoretic mobility of NTs due to dissociation of surface hydroxyl and carbonyl groups, which was identified by infra-red (IR) spectroscopy. The observed attraction between similarly charged colloidal particles of NTs and laponite was explained by the highly heterogeneous distribution of negatively charged functional groups on the surface of NTs and difference in electrophoretic mobility of NT and laponite particles.

AB - To characterize the electric double layers (EDLs) of multi-walled carbon nanotubes (NTs), laponite clay disks and NT+laponite hybrid particles, their electrophoretic mobility was investigated as a function of pH and concentration of electrolytes (KCl, CaCl2 and AlCl3). The electrokinetic behaviour of NTs resembles that of the lyophobic colloids. An increase in pH from 2 to 12 resulted in substantial increase of the absolute (negative) values of the electrophoretic mobility of NTs due to dissociation of surface hydroxyl and carbonyl groups, which was identified by infra-red (IR) spectroscopy. The observed attraction between similarly charged colloidal particles of NTs and laponite was explained by the highly heterogeneous distribution of negatively charged functional groups on the surface of NTs and difference in electrophoretic mobility of NT and laponite particles.

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KW - Electrolytes

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KW - Laponite clay disks

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KW - Surface groups

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