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Colloid and Polymer Science

, Volume 272, Issue 3, pp 332–337 | Cite as

Cubic equations of state for adsorption layer: alkylthiopolyoxyethylene glycols

  • S. Kucharski
Original Contributions

Abstract

The van der Waals, Redlich-Kwong, Peng-Robinson and an equation of state derived by Smith were applied to approximate the run of surface pressure (Π) — area (σ) curves of the adsorption layer ofn-pentyl ton-octyl thioethers of tri- and tetraoxyethylene glycols. The equation parameters: excluded molar area (σoi) and an interaction energy term (ai) were determined by simplex method for Π values in the range of 2–23.5 mN/m. The equations parameters were found to be related to the structure of the amphiphile. The σoi decreased with the length of hydrocarbon thioether chain and was nearly uniform for equations of state in question except for Smith equation. The value ofai was dependent on the amphiphile structure. It was used to obtain the interaction energy ɛi between amphiphiles in the adsorption layer. The values of αi determined as an increment per methylene group was in the range of ca. 0.2–0.32R*T, depending on the equation of state used.

Key words

Adsorption layer equations of state nonionic surfactants alkylthiopolyoxyethylene glycols 

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Copyright information

© Steinkopff-Verlag 1994

Authors and Affiliations

  • S. Kucharski
    • 1
  1. 1.Institute of Organic and Polymer TechnologyWroclaw Technical UniversityWroclawPoland

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