Impact of aqueous electrolytes on interfacial energy
Impact of aqueous electrolytes on interfacial energy
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DOI：
10.1006/jcis.1997.5380
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发表时间：
1998-04-01
影响因子：
9.9
通讯作者：
Grasso, D
中科院分区：
文献类型：
--
作者：
Butkus, MA;Grasso, D
含水电解质对含水介质中颗粒-颗粒相互作用的影响尚未完全了解。电解质通常被认为仅影响静电能。在这项工作中，使用疏水性和亲水性底物的影响，电解质水溶液上的货车德瓦尔斯和刘易斯酸/碱势能进行了量化。超过0.001 M的离子强度的增加导致在聚四氟乙烯（PTFE）和有机涂层钠蒙脱石系统中的固体-水界面能的可比增加。在水/PTFE界面能的变化，通过接触角测量确定，是大于预测的筛选的非分散组件的Hamaker常数使用Mahanty和Ninham模型。界面能的增加，作为盐浓度的函数，是更大的增加基板的亲水性。虽然在这项工作中研究的系统是不同的性质，他们都表现出类似的趋势，界面表面能作为离子强度的函数。结果的相似性可能表明，水性电解质可以改变界面区域内的溶剂结构。(C)北京：科学出版社.
The effects of aqueous electrolytes on particle-particle interactions in aqueous media are not completely understood. Electrolytes are typically considered to impact only electrostatic energy. In this work, the impact of aqueous electrolytes on van der Waals and Lewis acid/base potential energies was quantified using both hydrophobic and hydrophilic substrates. Increases in ionic strength beyond 0.001 M resulted in comparable increases in solid-water interfacial energy in polytetrafluoroethylene (PTFE) and organically coated sodium montmorillonite systems. The change in water/PTFE interfacial energy, as determined by contact angle measurements, was greater than that predicted by screening of the nondispersion component of the Hamaker constant using the Mahanty and Ninham model. Increases in interfacial energy, as a function of salt concentration, were greater with increasing substrate hydrophilicity. Although the systems studied in this work were disparate in nature, they all appeared to exhibit similar trends in interfacial surface energy as a function of ionic strength. Similarity in the results may suggest that aqueous electrolytes may modify the solvent structure within the interfacial region. (C) 1998 Academic Press.