Wu N, Dai J, Micale FJ
Sun Chemical Corporation, 631 Central Avenue, Carlstadt, New Jersey, 07072
J Colloid Interface Sci. 1999 Jul 15;215(2):258-269. doi: 10.1006/jcis.1999.6270.
An experimental method called dynamic Wilhelmy plate technique (DWPT) for studying dynamic surface tension was designed in this study. A diffusion-controlled model corresponding to the initial and boundary conditions of this method was proposed. Dynamic surface tension of Triton X-100 and SDS was measured with this technique and analyzed with the proposed model. The calculated diffusion coefficients for the short- and long-time approximations are 3.7 x 10(-6) and 0.97 x 10(-6) cm(2)/s for Triton X-100 and 4.6 x 10(-6) and 0.79 x 10(-6) cm(2)/s for SDS, respectively. The predicted dynamic surface tension with these diffusion coefficients for the simultaneously generated aqueous/air interfaces is in good agreement with the drop mass technique. Another diffusion controlled model that considers the energy barrier at the aqueous/air interface was also proposed in this study. The calculated energy barriers are in the range of 4.1-5.7 RT for Triton X-100 and 6.5-8.0 RT for SDS. Copyright 1999 Academic Press.
本研究设计了一种名为动态威尔海姆平板技术（DWPT）的实验方法来研究动态表面张力。针对该方法的初始条件和边界条件，提出了一个扩散控制模型。用此技术测量了吐温X - 100和十二烷基硫酸钠（SDS）的动态表面张力，并用所提出的模型进行了分析。对于吐温X - 100，短时间和长时间近似下计算得到的扩散系数分别为3.7×10⁻⁶和0.97×10⁻⁶ cm²/s；对于SDS，相应的扩散系数分别为4.6×10⁻⁶和0.79×10⁻⁶ cm²/s。用这些扩散系数预测同时产生的水/空气界面的动态表面张力，与液滴质量技术结果吻合良好。本研究还提出了另一个考虑水/空气界面能垒的扩散控制模型。计算得到的能垒范围为：吐温X - 100为4.1 - 5.7 RT，SDS为6.5 - 8.0 RT。版权所有1999，学术出版社。
