Depletion interaction between spheres immersed in a solution of ideal polymer chains

Depletion interaction between spheres immersed in a solution of ideal polymer chains
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浸没在理想聚合物链溶液中的球体之间的耗尽相互作用

DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
H. Lekkerkerker
H. Lekkerkerker
中科院分区：
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文献类型：
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作者：
R. Tuinier;G. Vliegenthart;H. Lekkerkerker

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计算了两个球之间由于非吸附理想聚合物的耗尽相互作用 从使用过量（负）吸附的聚合物浓度分布。计算机 模拟表明，两个球体周围的聚合物浓度分布很好地描述为： 单个球体周围浓度分布的乘积函数。从交互 两个球体之间的势，第二渗透维里系数B2计算为各种 聚合物-胶体尺寸比。我们发现，当聚合物变得比球体小时， 在稀释状态下仍为阳性。这表明，耗尽相互作用对于 相对较小的球体。
The depletion interaction between two spheres due to nonadsorbing ideal polymers is calculated from the polymer concentration profile using the excess (negative) adsorption. Computer simulations show that the polymer concentration profiles around two spheres are well described by the product function of the concentration profile around a single sphere. From the interaction potential between two spheres the second osmotic virial coefficient, B2 , is calculated for various polymer-colloid size ratios. We find that when the polymers become smaller than the spheres, B2 remains positive in the dilute regime. This shows that the depletion interaction is ineffective for relatively small spheres.