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## During area deformation, the surface tension The elasticity of a monolayer adsorbed from a surfactant soluis different from its equilibrium value and depends on time: tion is considered by continuous surface deformation. For all kinds s(t). We are merely interested in the jump of the surface surface deformations a single relation between the elasticity and tension s(t) defined as Ds(t) Å s(t) 0 s e . the effective time should be obtained (master curve). This effective If the relaxation process of the equilibrium re-establishing time depends on the rate of deformation and on the kind of deforis diffusion, it is plain the diffusion equation must be consid- ## mation. The relation between elasticity and effective time was ered with corresponding boundary conditions. Since the surproven experimentally for a decanoic acid solution at a concentraface is deformed continuously, a convection term must be tion 10 07 mol cm 03 . The following surface deformations are conaccounted for in the diffusion Eq. [1]. In this way the jump sidered: (i) expansion at a constant dilatation rate, (ii) compression at a constant dilatation rate, (iii) linear expansion, (iv) linear in surface tension with

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Author

Paul Joos; Peter Petrov; Jiping Fang

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)

Published

1996

Language

EN

Field

Chemistry (Physical Sciences)