Méthode Graphique de Boltzmann pour la Détermination du Coéfficient de Diffusion de Translation
Laura Soulié · Journal of Polymer Science Part C Polymer Symposia · 1967
Abstract Boltzmann has examined the solution of the equation with diffusion partial derivatives, the so‐called second Fick's equations when the translation diffusion coefficientDis a function of the concentration. In a particular initial concentration distribution he presents an integral solution of which one limit is infinite; the other limit containsx/√t, wherexis the distance from the initial separation surface andtthe time after the start of the diffusion. The concentration should therefore depend only on the variablex/√t. On the basis of theoretical considerations and experimental controls it is shown thatDis not a function only ofx/√t.