Shear modulus and yield stress measurements of attractive alumina particle networks in aqueous slurries
- Univ. of California, Santa Barbara, CA (United States)
The shear modulus and yield stress measurements of attractive alumina particle networks in aqueous slurries was determined as a function of volume fraction (0.1 to 0.5), pH (2, 4, 5, 6, and 9), and salt (NH{sub 4}Cl) concentration (0.25M to 2.5M) using both vane and couette rheological tools. Consistent with previous observations concerning the relative strength of attractive particle networks, the shear modulus increased to a plateau value with salt concentration. In this work the authors have shown that the salt concentration at which this plateau value is achieved is a function of the pH, and thus, the surface charge density. The values of the shear modulus [G{prime}], yield stress [{tau}{sub y}], and yield strain [{gamma}{sub y}] of the attractive networks can be described with power law functions for particle volume fraction [{Phi}] (G{prime} {proportional_to} {Phi}{sup 4.75}, {tau}{sub y}, {proportional_to} {Phi}{sup 3.6}, and {gamma}{sub y}, {proportional_to} {Phi}{sup {minus}1.1}) and salt concentration [c] (G{prime} {proportional_to} [c]{sup 2.0}, {tau}{sub y} {proportional_to} [c]{sup 1.15}, and {gamma}{sub y} {proportional_to} [c]{sup {minus}0.85}).
- Sponsoring Organization:
- Office of Naval Research, Washington, DC (United States)
- OSTI ID:
- 417777
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 11 Vol. 79; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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