Stability of multi-walled carbon nanotube+laponite hybrid particles in aqueous suspensions

Maryna V. Manilo, Nikolai I. Lebovka, S. Bárány

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Aggregation of multi-walled carbon nanotube (NT)+laponite hybrid particles in aqueous suspensions under continuous stirring at different values of mass ratio of laponite and NTs, X=mL/mNT, was investigated using Photometric Dispersion Analyser. It has been found that NTs+laponite suspension at X=1 is the most stable in respect to variation of pH and electrolytes concentration. Addition of electrolytes (KCl, CaCl2 and AlCl3) destabilized the suspension with formation of large quickly sedimenting flocs. Also the strength of flocs and the reversibility of aggregation of NT+laponite nanoparticles as a function of the shear rate have been determined. From time dependencies of the degree of aggregation in hybrid NTs+laponite suspensions, the critical coagulation concentrations (CCC) for KCl (CCC1=5×10-3M), CaCl2 (CCC2=10-3M) and AlCl3 (CCC3=10-5M) for the NTs+laponite complex suspension were estimated. The ratio of CCC1/CCC2≈5 is very close to the CCCz2.5=5.66 criterion. It is an evidence of aggregation of NT+laponite hybrid particles in the secondary minimum.

Original languageEnglish
Pages (from-to)199-206
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume481
DOIs
Publication statusPublished - Sep 1 2015

Fingerprint

Carbon Nanotubes
Carbon nanotubes
Suspensions
Agglomeration
carbon nanotubes
Nanotubes
Electrolytes
nanotubes
electrolytes
Coagulation
Shear deformation
stirring
coagulation
mass ratios
Nanoparticles
laponite
shear
nanoparticles

Keywords

  • Aggregation
  • Carbon nanotubes
  • Electrolytes
  • Laponite
  • PH
  • Reversibility

ASJC Scopus subject areas

  • Colloid and Surface Chemistry

Cite this

Stability of multi-walled carbon nanotube+laponite hybrid particles in aqueous suspensions. / Manilo, Maryna V.; Lebovka, Nikolai I.; Bárány, S.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 481, 01.09.2015, p. 199-206.

Research output: Contribution to journalArticle

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