Dynamic Surface Tension of Aqueous Surfactant Solutions: 1. Diffusion-Convective Controlled Adsorption

✍ Scribed by Leonid K. Filippov

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 452 KB
• Volume: 163
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1994.1079

✦ Synopsis

A quantitative theory of the dynamic surface tension with a constant diffusion coefficient is developed for diffusion-controlled and diffusion-convective-controlled adsorption. The effect of the convective transfer is estimated in an analytical form for the short-time and large-time approximations. It is concluded that the dynamic surface tension can be described by the diffusion-convective controlled model. It is shown that the equation of (F(\gamma(t))=\log \left[\left(\gamma_{0}-\gamma(t)\right) /\left(\gamma(t)-\gamma_{\mathrm{e}}\right)\right]=n \log \left(t / t^{}\right)) is valid over a wide range of time. The phenomenological approach of Rosen and co-workers is shown to be asymptotical correlation (n) equals one-half. The simple formula is derived to calculate the parameters (n, t^{}, D) (diffusion coefficient), and the dynamic surface tension over a wide range of time for adsorption isotherms of different types (linear, Langmuir, and Freundlich). (1994 Academic Press, Inc.