NDLI: Dispersion state and rheology of hectorite particles in water over a broad range of salt and particle concentrations

Content Provider	Springer Nature Link
Author	Kimura, Hiroshi Sakurai, Mikito Sugiyama, Taiki Tsuchida, Akira Okubo, Tsuneo Masuko, Toru
Copyright Year	2011
Abstract	The relationship between the rheological properties of deionized aqueous suspensions of hectorite particles and the dispersion states of the particles has been studied with a broad range of salt and particle concentrations. The shear viscosity of the hectorite suspensions decreases drastically after exhaustively deionizing the suspensions with ion-exchange resins. By means of DLS measurements, it is clarified that the average size of the flocs of hectorite particles decreases and reaches the Stokes diameter of the individual particle as the degree of deionization advances. This fact strongly supports the idea that the electrical double layer around the hectorite particles expands significantly in the exhaustively deionized state and the particles are well-dispersed individually and do not form a three-dimensional network structure composed of particles, whereas such a network structure forms in the presence of a large amount of salt. In the case of exhaustively deionized state, the suspension forms a glassy state, at high particle fractions. The results show the importance of the electrical double layer that causes a strong repulsive force among the particles on the particle dispersion state, especially in the exhaustive deionization area below 10 − 4 M, and on the rheological properties; the hectorite suspension can be considered a Newtonian liquid in the deionized state, but it becomes elastic-solid in the presence of salt above a certain concentration confirmed by normal stress measurements.
Starting Page	159
Ending Page	168
Page Count	10
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	50
Issue Number	2
e-ISSN	14351528
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-02-12
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hectorite Dispersion state Rheology Deionization Electrical double layer Food Science Soft and Granular Matter, Complex Fluids and Microfluidics Polymer Sciences Mechanical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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