EFFECT OF ELECTROLYTES ON BUBBLE COALESCENCE
EFFECT OF ELECTROLYTES ON BUBBLE COALESCENCE
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DOI：
10.1038/364317a0
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发表时间：
1993-07-22
期刊：
影响因子：
64.8
通讯作者：
PASHLEY, RM
中科院分区：
文献类型：
--
作者：
CRAIG, VSJ;NINHAM, BW;PASHLEY, RM
相对于淡水，海浪的泡沫性一直被认为是由于盐减少气泡聚结的作用。这种现象在使用泡沫浮选1的提取过程中被利用，其中提取效率随着气泡尺寸变小而增加。但是，尽管表面活性剂对气泡的稳定作用已经很好地理解，但盐的作用却没有;盐降低水的表面张力，并且它们从空气-水界面解吸的事实，如果有的话，预计会使气泡不稳定。在这里，我们报告的实验结果进行研究的稳定气泡的盐。我们发现，气泡聚结被抑制的一些盐，而其他人没有影响，这种抑制只发生在“匹配”的两个值的经验属性分配给每个阴离子和阳离子。我们认为这些观察结果只能通过离子对水结构的局部影响来解释，可能与疏水相互作用有关2 -8。
THE foaminess of ocean waves, relative to fresh water, has long been attributed to the effect of salts in reducing bubble coalescence9. This phenomenon is exploited in extraction processes using froth flotation1, in which the extraction efficiency increases as the bubble size gets smaller. But whereas the bubble-stabilizing effect of surfactants is well understood, the effect of salts is not; the fact that salts decrease the surface tension of water and that they are desorbed from the air-water interface would, if anything, be expected to destabilize bubbles. Here we report the results of experiments conducted to study the stabilization of bubbles by salts. We find that bubble coalescence is inhibited by some salts whereas others have no effect and that this inhibition occurs only upon the 'matching' of a two-valued empirical property assigned to each anion and cation. We believe these observations can be explained only by the local influence of the ions on water structure, possibly in a way related to the hydrophobic interaction2-8.