期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 197, 期 1-3, 页码 173-181出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0927-7757(01)00889-5
关键词
suspension; precipitated calcium carbonate; dioctylphthalate; yield stress; storage modulus; viscoelastic properties
Yield stress, storage and loss modulus of dispersions of colloidal particles of calcium carbonate in dioctylphthalate have been measured. They depend strongly on small amounts of water present in the suspension. The water thermodynamic activity has been used to characterise the water content of the suspension. There is an increase of more than an order of magnitude of the yield stress and storage modulus over the range 0.1-0.3 of water activity, and a smaller increase of the loss modulus. Beyond an activity of 0.3, these quantities are constant within experimental scatter. The effect of volume fraction has been investigated in this latter range of water activity. The results are discussed in term of interactions between particles. (C) 2002 Elsevier Science B.V. All rights reserved.
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