How to test the diffusion coefficient of solvent in bitumen. It is difficult to analyse by experimental data because the solvent can dissolve the bitumen and can't test layer change of solvent content. Would you please give me a more efficient method to test the diffusion coefficient of solvent in bitumen except FTIR-ATR methods. Thanks!
You can use a very accurate gravimeteric method. Simply expose the bitumen to vapor of the solvent and track the mass change. Then by solving the diffusion equation and integrating over time you can find the mass change in the model as well. Then what left is simply finding a right model/parameter for diffusion in the model which best fits the experimental data. We did this before for Asphaltenes in oil-sand and you can find the paper in my publications. Also if the solvent dissolves the bitumen, instead of the film we used in that experiment, you can use a container of bitumen with regular geometry.
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