In the present study, microstructural transitions of silica suspensions were examined by rheological measurements under either steady simple shear or oscillatory flow. First, monodisperse silica particles were prepared by the so-called modified Stöber method and were stabilized sterically in organic medium. Silane coupling agent, such as 3-(trimethoxysilyl)propyl methacrylate or N-[3-(trimethoxysilyl)propyl] ethylenediamine (aminosilane coupling agent) was coated onto the particle surface to induce steric stabilization at various volume fractions (φ) up to φ=0.45. To ensure 'hard' sphere suspension, the silica particles were dispersed in a refractive-index matching solvent, tetrahydrofurfuryl alcohol, in which the van der Waals dispersion forces diminished. Second, charge stabilized silica particles were prepared in aqueous medium. In this case, ionic strength was adjusted by KCl concentration after surface modification with amino silane coupling agent. The charge stabilized suspension showed stable shear-thinning behaviour, which was well contrasted by the hard sphere suspension. The latter exhibited negligible electrostatic repulsion and only short-range interactions. Finally, microstructural transition of aqueous silica suspensions from liquid- to solid-like structure was examined in terms of particle volume fraction and salt concentration.
|Number of pages
|Colloids and Surfaces A: Physicochemical and Engineering Aspects
|Published - 2001 Sept 30
Bibliographical noteFunding Information:
This work was supported by a grant from the Ministry of Commerce, Industry and Energy. The authors also acknowledge partial supports from the Brain Korea 21 project and from the Applied Rheology Center.
Copyright 2017 Elsevier B.V., All rights reserved.
- Charge stabilization
- Microstructural transition
- Rheological behaviour
- Silica suspension
- Soft and hard spheres
ASJC Scopus subject areas
- Surfaces and Interfaces
- Physical and Theoretical Chemistry
- Colloid and Surface Chemistry