How to calculate diffusion coefficient of swelling gel? Is Fick's law still valid for it?

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H. Demey

You can Use Crank's model to determine the difussion Coefficients in sorption process:

http://www.sciencedirect.com/science/article/pii/S1385894714000771

Best Regards

Josef Chmelar

Hello, I know that you asked a long time ago, but still.. Ficks law can be used to describe diffusion in swelling materials, you just have to account for this phenomenon (e.g., by having a concentration dependent density). We did this for diffusion in PS (http://pubs.acs.org/doi/abs/10.1021/je300916f).

However, you could encounter concentration dependent diffusivities or changing properties of the gel during sorption / desorption, but I do not have experience with this.