Van Winkle, Quentin Formerly, Department of Chemistry, Ohio State University, Columbus, Ohio.
Last reviewed:August 2020
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A filtration process in which particles of colloidal size are retained by a filter medium while solvent plus accompanying low-molecular-weight solutes are allowed to pass through. Ultrafilters are used (1) to separate colloid from suspending medium, (2) to separate particles of one size from particles of another size, and (3) to determine the distribution of particle sizes in colloidal systems by the use of filters of graded pore size.
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