Cellulose Acetate Membranes: Electron Microscopy of Structure

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Science  21 Feb 1964:
Vol. 143, Issue 3608, pp. 801-803
DOI: 10.1126/science.143.3608.801


Electron photomicrographs of cellulose acetate membranes used in the reverse osmosis processof water desalination reveal a dense surface layer with a porous substructure. The high rate oftransmission for water can be correlated with the thickness of the dense layer on the air-driedsurface of the membrane.