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Thin layer of PVA covalently cross-linked to MWCNTs–COOH and succinic acid onto a cellulose nitrate membrane. The succinic acid molecules and MWCNTs–COOH cross-linked the PVA strands, immobilizing MWCNTs and altering the spacing between PVA strands. Reprinted from [137], with permission from Elsevier.
