ISSN:
1435-1536
Keywords:
Surfactant
;
adsorption
;
pore
;
curvature
;
mean field
;
lattice
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract A mean field lattice (MFL) theory has been used to study the adsorption behaviour of nonionic surfactants in hydrophilic cylindrical pores. The theory predicts that with decreasing pore radius the absorbed amount decreases. Moreover, the step in the adsorption isotherm, which is a first-order phase transition in the mean field approximation, shifts to lower concentrations. Both effects have been observed in experiments. When an adsorbed layer is curved from convex (rod) to concave (pore) at constant area, the volume of the layer decreases. As a consequence, the stability of the layer increases and the adsorbed amount decreases.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01188932
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