Determination of the air-water interfacial area in wet ''unsaturated'' porous media
Determination of the air-water interfacial area in wet ''unsaturated'' porous media
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DOI：
10.1021/la950821v
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发表时间：
1996-04-17
期刊：
影响因子：
3.9
通讯作者：
Fort, T
中科院分区：
文献类型：
--
作者：
Karkare, MV;Fort, T
本文提出了一种确定湿润非饱和多孔介质中气水界面面积的方法。该方法取决于确定在系统内实现水运动所需的表面活性剂的临界浓度。有效的表面活性剂不溶于水，在空气-水界面上以单分子层的形式铺展，并形成固体单分子层，其对水的表面张力几乎没有或没有影响，直到表面活性剂分子的表面浓度达到已知的临界值。在该临界浓度下，在系统内建立毛细管压力梯度，并且水移动。不同水浓度对空气-水界面面积的影响的研究显示了正确的趋势和正确极限的趋势。该技术的优点和局限性进行了讨论。在潮湿的非饱和多孔介质中的空气-水界面面积以前没有被实验访问。
A method is proposed for determining the area of the air-water interface in wet but unsaturated porous media. The method depends on determining the critical concentration of surfactant necessary to achieve water movement within the system. Effective surfactants are insoluble in water, are spread as monolayers at the air-water interface, and form solid monolayers which have little or no effect on the surface tension of water until surface concentration of surfactant molecules reaches a known critical value. At this critical concentration, capillary pressure gradients are established within the system, and water moves. Studies of the effects of different water concentrations on air-water interfacial areas show the correct trends and trend toward the correct limits. Advantages and limitations of the technique are discussed. The air-water interfacial area in wet unsaturated porous media has not previously been experimentally accessible.