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Mixed monolayer and mixed micelle formation in binary mixture of surfactants—Systems for trioxyethylenated dodecyl sulfonate and some polyoxyethylenated fatty alcohol ether nonionic surfactants
Author(s) -
Wang ZhongNi,
Li GanZuo,
Mu JianHai,
Zhang WenXia
Publication year - 2002
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-002-0238-5
Subject(s) - chemistry , micelle , monolayer , pulmonary surfactant , critical micelle concentration , surface tension , fatty alcohol , aqueous solution , alkyl , ether , aggregation number , sulfonate , thermodynamics of micellization , organic chemistry , thermodynamics , sodium , biochemistry , physics
The interaction and synergism of some polyoxyethylenated fatty alcohol ether (POE) nonionic surfactants (C 12 E 2 , C 12 E 3 , C 10 E 5 , C 10 E 7 , where C x indicates number of carbon atoms in the chain and E y indicates number of oxyethylene glycol ethers) with trioxyethylenated dodecyl sulfonate (C 12 E 3 S) in mixed monolayer formation at the surface and in mixed micelle formation in aqueous solutions were studied at 25 and 40°C by calculating interaction parameters (β α , β M ) from surface tension‐concentration data by use of Rosen's equations based on the nonideal solution theory. All the systems investigated adapt reasonably well to the nonideal model, with negative values of β σ and β M (where M means micelle and σ refers to the air‐liquid interface) indicating a favorable interaction between the mixed surfactants. Either at a monolayer or in a mixed micelle, the attractive interaction becomes stronger when the alkyl chain in the POE surfactant is longer, i.e., when the POE becomes more hydrophobic. The interaction increases in the order C 10 E 7