A theoretical study on surfactant adsorption kinetics: Effect of bubble shape on dynamic surface tension

Ming Wei Yang, Hsien-Hung Wei, Shi Yow Lin

研究成果: Article同行評審

13 引文 斯高帕斯(Scopus)

摘要

A planar or spherical fluid-liquid interface was commonly assumed on studying the surfactant adsorption kinetics for a pendant bubble in surfactant solutions. However, the shape of a pendant bubble deviates from a sphere unless the bubble's capillary constant is close to zero. Up to date, the literature has no report about the shape effect on the relaxation of surface tension due to the shape difference between a pendant bubble and a sphere. The dynamic surface tension (DST), based on the actual shape of a pendant bubble with a needle, of the diffusion-controlled process is simulated using a time-dependent finite element method in this work. The shape effect and the existence of a needle on DST are investigated. This numerical simulation resolves also the time-dependent bulk surfactant concentration. The depth of solution needed to satisfy the classical Ward-Tordai infinite-solution assumption was also studied. For a diffusion-controlled adsorption process, bubble shape and needle size are two major factors affecting the DST. The existence of a needle accelerates the bulk diffusion for a small bubble; however, the shape of a large pendant bubble decelerates the bulk diffusion. An example using this method on the DST data of C12E4 is illustrated at the end of this work.

原文English
頁(從 - 到)12606-12616
頁數11
期刊Langmuir
23
發行號25
DOIs
出版狀態Published - 2007 十二月 4

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 凝聚態物理學
  • 表面和介面
  • 光譜
  • 電化學

指紋

深入研究「A theoretical study on surfactant adsorption kinetics: Effect of bubble shape on dynamic surface tension」主題。共同形成了獨特的指紋。

引用此