Can we use filtration method to separate colloidal particles? Why?

Question

thank you for your answers! ;)

Answer 1

Usually.

Filtration separates the particles in a mixture by size.  A successful filter must contain openings to allow just the smallest particles through, and hold back the others.

If the particles in a colloidal mixture are different sizes (and they usually are), a filter can separate them.

Answer 2

Assuming the particles are solid, yes, colloid particles of varying sizes can be separated from one another. Gel permeation chromatography, which is a glorified type of filtration usually used to measure molecular weights of polymers, can also be used to separate colloidal particles based on their size. Very easy to do, but the amounts that can be separated are limited. For larger amounts, sequential filtration through finer and finer filters is possible. If the particles are liquid, then they can deform and to through filter pores much smaller than the particles themselves.