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Monolayers of cationic gemini surfactants and their catanionic mixtures with sodium dodecyl sulfate (SDS), have been investigated with the Langmuir trough technique, at the air–water interface. The gemini surfactants are of the alkanediyl-α,ω-bis(alkyldimethylammonium) type, here designated as m-2-m, where m and 2 are the alkyl chain and spacer lengths, respectively. For the neat geminis, the stability...
A catanionic surfactant consists of paired oppositely charged surfactant ions, acting as counterions to each other. In this work, a series of catanionic surfactants with the cationic quaternary ammonium group and anionic sulfate group, with variation of chain length and number of chains, have been synthesized. The results of the Langmuir pressure–area isotherms, for compression and cycles of compression–decompression,...
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