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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Experimental phase diagram of symmetric binary colloidal mixtures with opposite charges
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Experimental phase diagram of symmetric binary colloidal mixtures with opposite charges

机译：带相反电荷的对称二元胶体混合物的实验相图

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摘要

The phase behavior of equimolar mixtures of oppositely charged colloidal systems with similar absolute charges is studied experimentally as a function of the salt concentration in the system and the colloid volume fraction. As the salt concentration increases, fluids of irreversible clusters, gels, liquid-gas coexistence, and finally, homogeneous fluids, are observed. Previous simulations of similar mixtures of Derjaguin-Landau-Verwey-Overbeek (DLVO) particles indeed showed the transition from homogeneous fluids to liquid-gas separation, but also predicted a reentrant fluid phase at low salt concentrations, which is not found in the experiments. Possibly, the fluid of clusters could be caused by a nonergodicity transition responsible for the gel phase in the reentrant fluid phase. Liquid-gas separation takes a delay time after the sample is prepared, whereas gels collapse from the beginning. The density of the liquid in coexistence with a vapor phase depends linearly on the overall colloid density of the system. The vapor, on the other hand, is comprised of equilibrium clusters, as expected from the simulations.
机译：实验研究了带有相反绝对电荷的带相反电荷的胶体系统的等摩尔混合物的相行为，它是系统中盐浓度和胶体体积分数的函数。随着盐浓度的增加，观察到不可逆团簇，凝胶，液-气共存的流体，最后观察到均匀的流体。先前对Derjaguin-Landau-Verwey-Overbeek（DLVO）颗粒的类似混合物的模拟确实显示了从均质流体到液-气分离的过渡，但是还预测了低盐浓度下的折返流体相，这在实验中没有发现。可能的是，团簇的流体可能是由导致折返流体相中凝胶相的非遍历性转变引起的。制备样品后，液气分离需要延迟时间，而凝胶从一开始就会塌陷。与气相共存的液体的密度线性地取决于系统的总胶体密度。另一方面，如模拟所期望的，蒸气由平衡簇组成。

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