Letter | Published:

Freeze Dried Cellulose Acetate Membranes with 1000 Å Pores

Naturevolume 214page285 (1967) | Download Citation

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Abstract

CELLULOSE acetate has been found to be the most suitable material for casting porous membranes from solvent mixtures for use in reverse osmosis1. The aim of the present investigation was to examine a simple alternative method of producing micropores, which might be expected to traverse thin sections of cellulose acetate. Freeze drying its solutions offers such an opportunity, because removal of the solvent will not cause the polymer to collapse. The porosity of the product decreases as the concentration of the solution increases, and the strongest possible solutions were therefore investigated.

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References

  1. 1

    Loeb, S., and Sourirajan, S., U.C.L.A. Dept. Eng. Rep. No. 60–60 (1960).

  2. 2

    Lewis, F. M., and Mayo, R. F., Ind. Eng. Chem. Anal. Edn., 17, 134 (1945).

  3. 3

    Vinogradov, G. V., and Titkova, L. V., Kolloid. Zh., 27, 138 (1965).

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Author notes

    • H. P. ROTHBAUM

    Present address: Chemistry Division, D.S.I.R., Wellington, New Zealand

Affiliations

  1. National Physical Laboratory, Teddington, Middlesex

    • H. P. ROTHBAUM

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https://doi.org/10.1038/214285a0

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