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Study of the interaction between a liquid film and a local probe

Ledesma-Alonso, René. Study of the interaction between a liquid film and a local probe. PhD, Institut National Polytechnique de Toulouse, 2013

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Official URL: http://ethesis.inp-toulouse.fr/archive/00002540/

Abstract

The static and dynamic interaction between a local probe and a liquid film provokes the deformation of the latter. This phenomenon has been described by means of analytical equations, which had been analyzed and numerically solved. Probe/liquid and liquid/substrate interaction potentials have been deduced from the integration of the dispersion forces. The pressure difference across the air/liquid interface has been calculated with a modified Young-Laplace equation, which takes into account the effects of gravity, surface tension, the liquid film/substrate and the probe/liquid interaction potentials. For the static case, the equilibrium modified Young-Laplace equation has been considered. The lubrication theory has been used to describe the liquid film evolution, in order to analyze the dynamic phenomenon. Numerical simulations of the equilibrium surface shape and the dynamic evolution of the film have been performed. Stable and unstable behaviors had been discerned, and results confirmed the existence of a threshold distance, for the static case, and a combination of oscillation parameters, for the dynamic situation, for which the jump of the liquid to contact the probe occurs. A theoretical analysis confirmed the existence of critical conditions separating the behavior regimes. This critical conditions indicate the role of the physical and geometric parameters in the system stability. For the dynamic case, preliminary results are reported and a qualitative interpretation of the phenomenon is formulated. In addition, AFM force and amplitude spectroscopy experiments had been performed and compared with the numerical results.

Item Type:PhD Thesis
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Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
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Research Director:
Tordjeman, Philippe and Legendre, Dominique
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Deposited On:01 Apr 2014 21:58

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