Empirical equations of state for adsorption layer: Alkylthiopolyoxyethylene glycols |
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Authors: | S Kucharski A Sokolowski |
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Institution: | (1) Present address: Institute of Organic and Polymer Technology, Wroclaw Technical University, ul. Wybrzeze Wyspianskiego 27, PL-50-370 Wroclaw, Poland |
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Abstract: | Surface tension isotherms ofn-alkylthiopolyoxyerhylene glycols:n-C
x
H2x+1S(CH2CH2O)
y
H, wherex=5 to 8,y=3 or 4, were approximated with orthogonal polynomials to get good quality values of surface pressure (II) and molar area of the adsorbed layer (). The modified Volmer (*(–0)=Z*R*T) van der Waals and virial equations of state were used to correlate and in terms of real two-dimensional gas. The combination of Volmer and van der Waals equations of state made it possible to determine the interaction energy, , which was prescribed to cohesion of hydrophobic chains in the adsorption layer. The value of for the amphiphiles in question was in the range 0.97–1.91R*T and the average contribution per methylene group was ca. 0.21R*T.The Lennard-Jones potentials calculated from second virial coefficient were of the same range as , but no clear relation was found between their values and number of structure elements of the alkylthiopolyoxyethlene glycols.Presented during 7th International Conference: Surface and Colloid Science, July 7–13, 1991, Compiegne, France |
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Keywords: | Adsorption equations of state alkylthiopolyoxyethylene glycols nonionic surfactants |
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