Preparation of Carbon Nanotube Dispersions in Solutions of Ethoxylated Fatty Alcohols for Modifying Gel Systems

A systematic study has been performed for the effect of nonionic surfactants (NSs), i.e., ethoxylated higher fatty alcohols with different ethoxylation degrees, on the ultrasonic dispersion of carbon nanotubes in aqueous solutions and on the colloid-chemical properties of the resulting dispersions,...

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Bibliographic Details
Published in:Colloid journal of the Russian Academy of Sciences 2024-06, Vol.86 (3), p.358-369
Main Authors: Gataullin, A. R., Abramov, V. A., Bogdanova, S. A., Salnikov, V. V., Zuev, Yu. F., Galyametdinov, Yu. G.
Format: Article
Language:English
Subjects:
Alcohol
Alcohols
Aqueous solutions
Carbon
Carbon nanotubes
Chemical properties
Chemistry
Chemistry and Materials Science
Colloid chemistry
Dispersions
Electrical properties
Electrical resistivity
Electrokinetics
Ethoxylation
Flow stability
Nonlinear systems
Optical density
Optical properties
Polyacrylic acid
Polymer gels
Polymer Sciences
Relaxation time
Rheological properties
Surfaces and Interfaces
Surfactants
Thin Films
Viscous flow
Yield stress
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Summary:A systematic study has been performed for the effect of nonionic surfactants (NSs), i.e., ethoxylated higher fatty alcohols with different ethoxylation degrees, on the ultrasonic dispersion of carbon nanotubes in aqueous solutions and on the colloid-chemical properties of the resulting dispersions, namely, their optical density and the sizes and electrokinetic potentials of the particles in the colloidal systems. A non-linear dependence of the characteristics of dispersions on the ethoxylation degree has been revealed. This dependence is associated with structural transformations in NS molecules. The most efficient ethoxylation degree and concentration of nonionic surfactants in a solution, which have the highest disaggregating and stabilizing effects upon the preparation of carbon nanotube (CNT) dispersions, have been determined. The influence of the ethoxylation degree of the ethoxylated higher fatty alcohols on the electrokinetic properties of CNT dispersions has been revealed. It has been shown that carbon nanotube dispersions can be used to modify the rheological and electrical properties of gel systems based on rarely crosslinked poly(acrylic acid). The effects of NSs and CNTs on the viscosity, shear yield stress, consistency index, mechanical stability, relaxation time, and viscous flow activation energy of the polymer gels have been studied. It has been shown that the incorporation of nanotubes increases the electrical conductivity of the gels. The ultrastructure of the gel samples has been studied by transmission electron microscopy.
ISSN:1061-933X
1608-3067
DOI:10.1134/S1061933X24600155