Thermodynamique des milieux inhomogènes à pression d'équilibre anisotrope

Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe

Coupling between a transconformation surface reaction and hydrodynamic motion

Conditions are given for chemical and hydrodynamic instability of a cooperative transconformation reaction at the interface between two immiscible liquids. © 1975.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Rigid dipole orientation at fluid interfaces-role of the dielectric constants, of the relaxation and of the co-operativity

The thermodynamics of interfacial dipole layers allows the demonstration of the role of the dielectric constants on the orientation affinity of dipoles at interfaces. A linear dependence of the difference of the affinities with the difference of the reverse mean dielectric constants is evidenced by comparing the orientation affinities of the same dipolar system towards two couples of different fluids. Surface relaxation and co-operative orientation induced by an electromechanical field are also discussed. Experiments performed by L. Lavielle et al. (CNRS Mulhouse) on grafted polyethylene and polypropylene in different liquids show good correlation with the theory. © 1991.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Chemical and Hydrodynamic Stability of an Interface with an Autocatalytic Reaction

An autocatalytic reaction of the trimolecular type is assumed to take place at the interface of two immiscible fluids. By coupling the chemical rate equations with the surface hydrodynamic equations, the authors obtain the threshold conditions for chemical and hydrodynamic instability. © 1973.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Association and dissociation in the electrochemical diffuse layer

A local thermodynamical investigation of the real dissociation constant K in the diffuse layer shows that it is theoretically possible to calculate the ratio Κ/Κ′, where Κ′ is the dissociation constant in the bulk phase. This ratio is a function of the field intensity. According to the values of the polarization terms and of the molar volumes of the components, the dissociation constant Κ in the double layer can be greater, equal or smaller than the one in the bulk.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

On a viscoelastic approach to the hydrodynamic stability of membranes

SCOPUS: le.jinfo:eu-repo/semantics/publishe

Motion induced by surface-chemical and electrochemical kinetics

It is well known that motion at a liquid-liquid interface may be generated by the transfer of matter. The constraint is the difference in concentration profiles between both bulk phases. In the same way, surface-chemical, sorption or electrochemical reactions may also induce convection. The constraint in this case is related to the non-equilibrium kinetic steps. A general theory based on a linear analysis of stability shows the role of mechanical (density, viscosity, interfacial tension, surface elasticity), chemical (kinetic constants, composition) or electrochemical (electrical field, dielectric constant) parameters in the onset of interfacial deformations and movements. The stresses acting on the system are mainly due to Laplace-Kelvin and Marangoni effects. Experimental evidence observed for solvent-extraction reagents are analysed within the framework of our theory.SCOPUS: ar.jinfo:eu-repo/semantics/publishe