Modeling and Measurement of the Dynamic Surface Tension of Surfactant Solutions

Author:

Hasegawa Tomiichi1,Karasawa Masahiro2,Narumi Takatsune1

Affiliation:

1. Faculty of Engineering, Niigata University, 8050, Ikarashi-2, Nishi-ku, Niigata-shi 950-2181, Japan

2. Graduate School of Science and Technology, Niigata University, 8050 Ikarashi-2, Nishi-ku, Niigata-shi 950-2181, Japan

Abstract

Surfactant solutions are usually used under conditions accompanied by transient dynamic surfaces, and therefore the dynamic surface tension (DST) is important in many industrial processes. Theories regarding DST have been developed exclusively on the adsorption theory that molecules are transported from bulk solution to the interface. However, the adsorption theory is not closed and requires another relationship between the interfacial concentration of the adsorbing molecules and the bulk concentration of molecules near and at the surface, which at present is based on assumptions. In addition, DST obtained by the adsorption theory contains several parameters that must be determined beforehand, and it is not simple to use for practical purposes. Here, we propose a new model based on the concept that surfactant molecules rotate during the process reaching the equilibrium surface state, which is different from the conventional adsorption theory, and we obtained a simple expression of DST as a function of the surface age. In addition, an experiment was carried out to determine DST by measuring the period and weight of droplets falling from a capillary. The expression by the proposed model was compared with the results of this experiment and with those reported previously by several other authors, and good agreement was obtained. Furthermore, the characteristic time in the model was shown to be correlated with the concentrations of solutions regardless of the type of solutions examined.

Publisher

ASME International

Subject

Mechanical Engineering

Reference15 articles.

1. Time-Dependence of Boundary Tensions of Solutions, I. The Role of Diffusion in Time-Effects;Ward;J. Chem. Phys.

2. Dynamic Surface and Interfacial Tensions of Surfactant and Polymer Solutions;Miller;Adv. Colloid Interface Sci.

3. Characterization of Adsorption Layers at Liquid Interfaces—Studies With Drop and Bubble Methods;Miller

4. Solution/Air Interfaces I. An Oscillating Jet Relative Method for Determining Dynamic Surface Tensions;Thomas;J. Colloid Interface Sci.

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3