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Surfactant-assisted Spreading of a Liquid Drop on a Smooth Solid Surface by Kit Yan Chan; Ali Borhan is a Chemistry article available to read on EtoBox.

What is Surfactant-assisted Spreading of a Liquid Drop on a Smooth Solid Surface about?

Axisymmetric spreading of a liquid drop covered with an insoluble surfactant monolayer on a smooth solid substrate is numerically investigated. As the drop spreads, the adsorbed surfactant molecules are constantly redistributed along the air-liquid interface by convection and diffusion, leading to nonuniformities in surface tension along the interface. The resulting Marangoni stresses affect the spreading rate by altering the surface flow and the drop shape. In addition, surfactant accumulation in the vicinity of the moving contact line affects the spreading rate by altering the balance of line forces. Two different models for the constitutive relation at the moving contact line are used, in conjunction with a surface equation of state based on the Frumkin adsorption framework, to probe the surfactant influence. The coupled evolution equations for the drop shape and monolayer concentration profile are integrated using a pseudospectral method to determine the rate of surfactant-assisted spreading over a wide range of the dimensionless parameters governing the spreading process. The insoluble monolayer enhances spreading through two mechanisms; a reduction in the equilibrium contact

Who reads Surfactant-assisted Spreading of a Liquid Drop on a Smooth Solid Surface?

Author

Kit Yan Chan; Ali Borhan

Publisher

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

Published

2005

Language

EN

Field

Chemistry (Physical Sciences)