A theoretical study on surfactant adsorption kinetics

Effect of bubble shape on dynamic surface tension

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

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)12606-12616
Number of pages11
JournalLangmuir
Volume23
Issue number25
DOIs
Publication statusPublished - 2007 Dec 4

Fingerprint

Surface-Active Agents
Surface tension
interfacial tension
Surface active agents
bubbles
Needles
surfactants
Adsorption
Kinetics
adsorption
kinetics
needles
Bubbles (in fluids)
Finite element method
Fluids
Computer simulation
Liquids
finite element method
fluids
liquids

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Yang, Ming Wei ; Wei, Hsien-Hung ; Lin, Shi Yow. / A theoretical study on surfactant adsorption kinetics : Effect of bubble shape on dynamic surface tension. In: Langmuir. 2007 ; Vol. 23, No. 25. pp. 12606-12616.
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A theoretical study on surfactant adsorption kinetics : Effect of bubble shape on dynamic surface tension. / Yang, Ming Wei; Wei, Hsien-Hung; Lin, Shi Yow.

In: Langmuir, Vol. 23, No. 25, 04.12.2007, p. 12606-12616.

Research output: Contribution to journalArticle

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