Abstract
The stabilization of the dispersed system of halloysite nanotubes (HN) obtained by ultrasonic treatment (UST) in the aqueous medium of the stabilizers of sodium polynaphthalene methylene sulfonate stabilizers (S-3) and a synthetic compound based on polycarboxylate ether (MG) is considered. The morphology of halloysite is studied. Various mechanisms of aggregate stability connected with the spatial obstacles to aggregation due to the action of electrostatic, adsorption-solvate, and structural-mechanical stabilization factors are established. Three variants of introducing S-3 and MG stabilizers into the dispersed system of halloysite nanotubes are considered. It has been found that the most preferred method is the one with the stabilizer added in two steps. In this variant halloysite nanotubes are of minimum size and with maximum specific surface area. The maximum ζ-potential values of 52.9 mV and 43.8 mV are obtained for the dispersed system stabilized with S-3.
Highlights
For the dispersed system stabilized with MG, the ζ-potential values do not exceed 20.9 mV, while the particle sizes decrease and the specific surface area grow
Modern materials based on synthetic fullerenes, carbon nanotubes and others are able to meet the requirements of different industries from a technical point of view, but their high cost, minor production volumes, and in some cases high toxicity, do not allow them to be considered as a serious alternative to traditional materials and components in the years ahead
The aim of the work is to study the stabilization of the dispersed system of halloysite nanotubes for silicate structural materials
Summary
For the dispersed system stabilized with MG, the ζ-potential values do not exceed 20.9 mV, while the particle sizes decrease and the specific surface area grow. The stabilizers (the S-3 and MG additives), varied by mechanism of action, were studied for the aggregate stability of the dispersed system based on halloysite nanotubes. To evaluate the stability to aggregation and sedimentation of the halloysite nanotubes dispersion system, the ZetaPlus analyzer was used for the ζ-potential, particle size, and their specific surface area.
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