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Chemical structures of non‐ionic surfactants. (A) Nonoxynol‐9, (B) Triton X‐100, (C) Brij‐97 contain ether linkages. (D) Onyxol 345 contains amide linkage. (E) Span‐20 and (F) Span‐80 contain ester linkages. (G) Tween‐20 and (H) Tween‐80 contain ether‐ester linkages
