What is the driving force behind diffusion?
The minimization of the chemical potential
What is Diffusion?
Diffusion is the spontaneous movement of particles or molecules from an area of higher concentration to an area of lower concentration, driven by the random motion of the particles.
What is Ficks first law?
How is the diffusion oefficient calculated?
alpha=distance between atomar planes
Gamma=jump rate
How is diffusion through a membrane defined?
P=permeabilität
P1,P2=Pressures at the respective sites
film thickness delta
Give Ficks second law.
How does the concentration in Diffusion evolve with time?
What is the mathematical description?
What is the Kirkendall effect?
The Kirkendall effect is the motion of interfaces between metals as a consequence of different diffusion rates/constants.
It proves that Diffusion works via vacancies.
What is the First Darken equation and what is the meaning of it?
V= the velocity of a marker in a diffusing body
What is the second Darken equation?
What is the temperature dependancy of D (or Gamma)?
What is the absolute mobility of a species?
The velocity devided by the force
How can the diffusion constant be calculated using absolute mobility?
Zuletzt geändertvor einem Jahr
