asymmetric membrane
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https://doi.org/10.1351/goldbook.AT06862
membrane constituted of two or more structural planes of non-identical morphologies.
Source:
PAC, 1996,
68
, 1479. 'Terminology for membranes and membrane processes (IUPAC Recommendations 1996)' on page 1481 (https://doi.org/10.1351/pac199668071479)