Rapid coagulation of polystyrene latex in a stopped-flow spectrophotometer
Rapid coagulation of polystyrene latex in a stopped-flow spectrophotometer
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DOI：
10.1016/0021-9797(74)90363-4
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发表时间：
1974-11
影响因子：
9.9
通讯作者：
J. Lichtenbelt;C. Pathmamanoharan;P. H. Wiersema
中科院分区：
文献类型：
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作者：
J. Lichtenbelt;C. Pathmamanoharan;P. H. Wiersema
用停流法测定了几种聚苯乙烯胶乳在电解质作用下的快速凝聚。通过外推到零时间，观察到两个单粒子形成双重态的初始过程。我们发现在20°C时的平均速率常数ifk 11 = 6.0 × 10− 12 p − 1cm 3sec su−1，其中p是粒子的数量;当我们假设粒子直径比道氏值小5%时，这个常数降低到4.9 × 10− 12 p − 1cm 3sec − 1。这些值分别等于von Smoluchowski值的56%和46%。利用流体动力学相互作用理论，这给出了Hamaker常数A = 7.0 × 10− 21 J或1.5 × 10− 21 J，分别与理论预测很好地吻合。
With a stopped-flow method the rapid coagulation by electrolyte of several polystyrene latices is measured. By extrapolating back to zero time the initial process of two single particles forming a doublet is observed. We find an average rate constant ifk11= 6.0 × 10−12p−1cm3sec su−1 at 20°C, where p is the number of particles; this constant is lowered to 4.9 × 10−12p−1cm3sec−1when we assume that the particle diameters are 5% lower than the Dow values. These values are equal to 56 and 46%, respectively, of the von Smoluchowski values. Using the theory of hydrodynamic interaction, this gives Hamaker constantsA= 7.0 × 10−21J or 1.5 × 10−21J, respectively, in good agreement with theoretical predictions.