Artículos de revistas
Diffusion of a dipolar tracer in a salty surface
Autor
HERNÁNDEZ CONTRERAS, M.
Institución
Resumen
SE DETERMINARON LOS COEFICIENTES DE DIFUSIÓN EN DOS DIMENSIONES DE UNA TRAZADORA DIPOLAR EN UNA SUPERFICIE CARGADA CON EL ENFOQUE DE LA ECUACIÓN DE LANGEVIN GENERALIZADA. LA FRICCIÓN DE ELECTROLITO EN EL MOVIMIENTO BROWNIANO TRASLACIONAL PRESENTA UN MÁXIMO COMO FUNCIÓN DE LA INTENSIDAD IÓNICA MOSTRANDO UN COMPORTAMIENTO SIMILAR A SU CONTRAPARTE TRIDIMENSIONAL. SIN EMBARGO, EL EFECTO DE LA FRICCIÓN DE ELECTROLITO EN EL MOVIMIENTO ROTACIONAL ES IMPORTANTE SÓLO A CONCENTRACIONES BAJAS O MODERADAS Y ES DESPRECIABLE A ALTA CONCENTRACIÓN IÓNICA.AbstractTHE TWO DIMENSIONAL TRANSLATIONAL AND ROTATIONAL DIFFUSION COEFFICIENTS OF A DIPOLAR TRACER IN A CHARGED SURFACE ARE DETERMINED WITH THE GENERALIZED LANGEVIN EQUATION APPROACH. THE ELECTROLYTE FRICTION EFFECT ON THE TRANSLATIONAL BROWNIAN MOVEMENT DISPLAYS A MAXIMUM AS A FUNCTION OF IONIC STRENGTH SHOWING SIMILAR TRENDS TO ITS THREE DIMENSIONAL COUNTERPART. HOWEVER, ITS EFFECT ON THE ROTATIONAL MOTION IS IMPORTANT ONLY AT LOW AND MODERATE SALT CONCENTRATION AND NEGLIGIBLE AT HIGH IONIC CONCENTRATION. THE TWO DIMENSIONAL TRANSLATIONAL AND ROTATIONAL DIFFUSION COEFFICIENTS OF A DIPOLAR TRACER IN A CHARGED SURFACE ARE DETERMINED WITH THE GENERALIZED LANGEVIN EQUATION APPROACH. THE ELECTROLYTE FRICTION EFFECT ON THE TRANSLATIONAL BROWNIAN MOVEMENT DISPLAYS A MAXIMUM AS A FUNCTION OF IONIC STRENGTH SHOWING SIMILAR TRENDS TO ITS THREE DIMENSIONAL COUNTERPART. HOWEVER, ITS EFFECT ON THE ROTATIONAL MOTION IS IMPORTANT ONLY AT LOW AND MODERATE SALT CONCENTRATION AND NEGLIGIBLE AT HIGH IONIC CONCENTRATION.