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本文对于根据表面压力数据计算有机蒸气(1)在单分子膜(2)上吸附量的方法加以讨论,指出Dean-Hayes计算方法会由于在铺展压力附近π-Γ_2曲线的斜率较大而引起较大的误差,并从Gibbs一般吸附方程式出发进行理论推导,得到一个计算蒸气吸附量的—般方程式。对于Γ_2→0的极限情况也加以讨论,得出:(1)Γ_2→0时,只是p_1的函数,而与Γ_2无关,此时的Γ_1基本上等于纯水对蒸气的吸附值;(2)当Γ_2→0时,μ2与p_1无关,因而建议以Γ_2=0作为采用Dean-Hayes计算方法时的标准态μ2°。 作者还报导了关于乙醚对十六酸单分子膜的影响的实验结果,并进行Γ_1与μ_2的计算以验证理论推导,发现:(1)在各p_1下,都在Γ_2≌2.2×10~(-10)克分子/cm~2(76(?)~2/分子)处,π出现最小值;(2)乙醚吸附量几乎与Γ_2无关,而在饱和压力下Γ_1=17-18(×10~(-10)克分子/cm~2);考虑有可能形成乙醚和十六酸的某种结合体,作者并对乙醚破坏泡沫的机理加以讨论。
In this paper, the method of calculating the adsorption amount of organic vapor (1) on monolayer (2) based on the surface pressure data is discussed. It is pointed out that the Dean-Hayes calculation method can be attributed to the larger slope of the π-Γ_2 curve near the spreading pressure Large errors and theoretically deduced from the general Gibbs adsorption equation to obtain a general equation for calculating the amount of vapor adsorbed. The limit of Γ_2 → 0 is also discussed. The results show that: (1) Γ_2 → 0 is only a function of p_1, but has nothing to do with Γ_2. Γ_1 at this time is basically equal to the adsorption value of pure water to the vapor; When Γ_2 → 0, μ2 is independent of p_1. Therefore, Γ_2 = 0 is recommended as the standard μ2 ° when using the Dean-Hayes method. The authors also reported experimental results on the influence of ether on the monolayer of hexadecanoic acid, and calculated the Γ_1 and μ_2 to verify the theoretical deduction. It was found that: (1) at each p_1, all were in the range of Γ_2≌2.2 × 10 ~ ( (2) the adsorption amount of ether is almost independent of Γ_2, and under saturation pressure Γ_1 = 17-18 (× 10 (-10) mol / cm2) ~ (-10) mol / cm ~ 2). Considering the possible formation of a combination of ether and palmitate, the authors discuss the mechanism by which ether destroys foam.