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Physical Chemistry seminar: Jan Dhont
A Physical Chemistry seminar by Professor Jan Dhont, Research Center Jülich, Germany
Title: Temperature-Induced Migration of Uncharged Interacting Macromolecules
Abstract: Migration of molecules induced by temperature gradients is commonly referred to as thermophoresis, thermodiffusion, thermal diffusion, or the (Ludwig-)Soret effect. The thermophoretic force experienced by a macromolecule (like a colloidal particle) that drives thermodiffusion consist of two distinct contributions: a contribution resulting from internal degrees of freedom of single colloidal particles (for example due to an electric double layer), and a contribution due to the interactions between the colloids. An irreverible thermodynamics-based theory will be discussed for the latter collective contribution to the thermophoretic force. The present theory leads to a novel "thermophoretic interaction force", which has not been considered in earlier approaches. This force will be shown to be essential to describe data on a sticky hard sphere suspension. The experimental method to obtain these data is commonly referred to as TDFRS (Thermo Diffusion Forced Rayleih Scattering), the principle of which will be briefly explained.
Om evenemanget
Plats:
Lecturehall KC:B
Kontakt:
felix [dot] roosen-runge [at] fkem1 [dot] lu [dot] se