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对二元完全互溶双液体系的稀溶液,建立一个理想吸附模型,以统计热力学原理可得到本文所引入的吸附表征参数Z的数学形式。利用微机处理,可得到以下结论:a)吸附表面层仅指溶质与溶剂分子尚存在相互作用,但性质又区别于体相的一厚度δ的薄层,而这吸附表面层中的“溶质分子”仅指溶质分子中的亲水部分,即并非是溶质的全分子。b)随着吸附分子浓度增大,表面超量Г值增大,吸附表征参数Z值减小;当吸附分子达到单层吸附饱和时,Г达到最大值Г_m,相应地Z达到最小值Zm。
An ideal adsorption model is established for the dilute solution of a binary fully miscible two-liquid system. The mathematical form of the adsorption characterization parameter Z introduced in this paper can be obtained by the statistical thermodynamic principle. Using computer processing, the following conclusions can be drawn: a) The adsorption surface layer refers only to the existence of an interaction between the solute and the solvent molecule but different in nature from the thin layer of a thickness δ of the bulk phase. The “solute molecule ”Refers only to the hydrophilic part of a solute molecule, ie a molecule that is not a solute. b) As the concentration of adsorbed molecules increases, the superficial Г value increases, and the Z value of the adsorption characterization parameter decreases. When the adsorbed molecule reaches the single-layer adsorption saturation, Γ reaches the maximum value Г_m, and Z reaches the minimum value Zm.