Specific Ion Effects at the Air-Water Interface: Experimental Studies
Specific Ion Effects at the Air-Water Interface: Experimental Studies
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空气-水界面上的特定离子效应：实验研究
DOI：
10.1142/9789814271585_0007
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发表时间：
2010
影响因子：
1.1
通讯作者：
C. L. Henry
中科院分区：
文献类型：
--
作者：
V. Craig;C. L. Henry
离子专一性在高电解质浓度下的所有软物质体系中都是重要的。影响许多生物过程的特定离子效应属于霍夫迈斯特范式，即阴离子和阳离子的作用强度遵循明确的顺序，独立于合作离子。相反，当盐抑制气泡聚结时所看到的离子特异性取决于存在的离子组合。通过简单的离子结合规则和阳离子和阴离子的经验分配（α或β）来确定，0.1M的单一电解质可能抑制气泡聚并或没有影响。混合电解质体系的聚并也可以通过这些规则的扩展来预测。在一些非水溶剂中的气泡聚结也可以显示出离子特异性，这种特异性取决于离子结合的方式，类似于在水中观察到的结合规则，这表明这是空气-溶液界面的一般性质。在这里，我们总结了在气泡聚结和其他软物质系统中观察到的截然不同的特异性离子效应具有相同起源的证据：离子特异性源于离子对界面亲和力的差异。由此得出结论，气泡聚结抑制中的结合规律是由气-液界面的动态性引起的。
Ion specificity is important in all soft matter systems at high electrolyte concentrations. Specific ion effects that influence many biological processes fall within theHofmeister paradigm, whereby the strength of action of the anions and cations follow a well-defined order, independent of the co-ion. In contrast, the ion specificity seen when salts inhibit bubble coalescence depends on the combination of ions present. Single electrolytes at 0.1M may inhibit bubble coalescence or have no effect, as determined by simple ion combining rules and empirical assignments (α or β) of the cation and the anion. The coalescence of mixed electrolyte systems can also be predicted by an extension of these rules. Bubble coalescence in some non-aqueous solvents can also show ion-specificity that depends upon ion combination in a way analogous to the combining rules observed in water — which suggests that this is a general property of the air–solution interface. Here, we summarise evidence that the contrasting specific ion effects observed in bubble coalescence and in other soft matter systems have the same origin: Ion specificity arises from differences in the affinity of ions for interfaces. This leads to the conclusion that combining rules seen in bubble coalescence inhibition arise from the dynamic nature of the air–solution interface.
DOI：
10.1021/jp800816a
发表时间：
2008-08-07
期刊：
The journal of physical chemistry. B
影响因子：
--
作者：
Pegram LM;Record MT Jr
通讯作者：
Record MT Jr