The Influence of Sodium Dodecyl Sulfate on the Surface Free Energy of Cassiterite
The Influence of Sodium Dodecyl Sulfate on the Surface Free Energy of Cassiterite
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DOI：
10.1006/jcis.1995.1116
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发表时间：
1995-03
期刊：
影响因子：
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通讯作者：
B. Jańczuk;M. Gónzalez-Martín;J. Bruque
中科院分区：
文献类型：
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作者：
B. Jańczuk;M. Gónzalez-Martín;J. Bruque
摘要 测量了覆盖十二烷基硫酸钠（SDS）薄膜的锡石表面上水、甘油、甲酰胺、二碘甲烷和溴仿的接触角。锡石样品以不同的方式制备用于测量。使用接触角值，确定锡石/SDS 薄膜表面自由能的 Lifshitz-van der Waals 和酸碱成分，并与“裸露”锡石表面的自由能进行比较。发现接触角和表面自由能的分量取决于形成吸附层的SDS溶液的pH和浓度。此外，锡石板的制备方法也会影响这些参数。研究还发现，锡石表面在 SDS 膜存在的情况下会发生水合作用，并且取决于 SDS 的浓度、pH 值和样品制备方法，并且会强烈影响锡石的表面自由能成分。
Abstract Measurements of contact angles for water, glycerol, formamide, diiodomethane, and bromoform on a cassiterite surface covered with sodium dodecyl sulfate (SDS) film were made. The samples of cassiterite were prepared in different ways for the measurements. Using the contact angle values, the Lifshitz-van der Waals and acid-base components of cassiterite/SDS film surface free energy were determined and compared with those for a "bare" cassiterite surface. It was found that the contact angle and the components of the surface free energy depend on the pH and concentration of the SDS solution from which the adsorption layer was formed. Also, the method of preparation of cassiterite plates influences these parameters. It was also found that the hydration of the cassiterite surface in the presence of a SDS film takes place and depends on the concentration of SDS, pH, and method of sample preparation, and strongly influences the surface free energy components of cassiterite.