Cluster, glass, and gel formation and viscoelastic phase separation in aqueous clay suspensions.
Cluster, glass, and gel formation and viscoelastic phase separation in aqueous clay suspensions.
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DOI：
10.1021/la062996i
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发表时间：
2007-02
期刊：
影响因子：
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通讯作者：
A. Shalkevich;A. Stradner;S. Bhat;F. Muller;P. Schurtenberger
中科院分区：
文献类型：
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作者：
A. Shalkevich;A. Stradner;S. Bhat;F. Muller;P. Schurtenberger
本文系统地研究了粘土颗粒在水中的相图，以了解粘土悬浮体的局部和宏观性质与结构之间的关系。我们特别关注在纳米复合材料中通常使用的浓度（浓度从1到4wt%）和在扩展的离子强度范围（10（-5）到10（-2）M NaCl）下的氯化钠（CNa）颗粒。悬浮液的特点是使用流变学和散射技术（中子，X-射线，和光）的组合。我们证明了在低粘土和中间盐浓度的液体簇相的存在，并提供了新的见解的固体状分散体的性质在低和高离子强度。
We have systematically investigated the phase diagram of clay particles in water to understand the relation between the local and macroscopic properties and the structures of clay suspensions. We focused, in particular, on sodium Cloisite (CNa) particles at concentrations typically used in nanocomposites (concentrations from 1 to 4 wt %) and at an extended range of ionic strengths (10(-5) to 10(-2) M NaCl). The suspensions have been characterized using rheology and a combination of scattering techniques (neutrons, X-rays, and light). We demonstrate the existence of a liquid cluster phase at low clay and intermediate salt concentrations and provide new insight into the nature of the solid-like dispersions at low and high ionic strengths.