Shear modulus and yield stress measurements of attractive alumina particle networks in aqueous slurries
Shear modulus and yield stress measurements of attractive alumina particle networks in aqueous slurries
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水浆中有吸引力的氧化铝颗粒网络的剪切模量和屈服应力测量
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
D. S. Pearson
中科院分区：
文献类型：
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作者：
J. Yanez;T. Shikata;F. Lange;D. S. Pearson
利用叶片和库埃特流变工具，确定了水泥浆中吸引氧化铝颗粒网络的剪切模量和屈服应力是体积分数（0.1至0.5）、pH值（2、4、5、6和9）和盐（NH4l）浓度（0.25M至2.34）的函数。剪切模量随着盐浓度的增加而增加到一个平台值，这与先前关于吸引粒子网络相对强度的观察结果一致。在这项工作中，我们已经表明，达到这个平台值的盐浓度是pH的函数，因此，表面电荷密度。吸引网络的剪切模量[G ']、屈服应力[τy]和屈服应变[γy]的取值可以用粒子体积分数[φ] （G '∝φ4.75, τy∝φ3.6, γy∝φ - 1.1）和盐浓度[c] （G '∝[c]2.0, τ,∝[c]1.15, γy∝[c]−0.85）的幂律函数来描述。
The shear modulus and yield stress 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 (NH4l) concentration (0.25M to 2.34) 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 we 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′], yield stress [τy], and yield strain [γy] of the attractive networks can be described with power law functions for particle volume fraction [φ] (G′∝φ4.75, τy∝φ3.6, and γy∝φ−1.1) and salt concentration [c] (G′∝ [c]2.0, τ, ∝ [c]1.15, and γy∝ [c]−0.85).