Adsorption and micelle formation of alkylammonium chloride–alkyltrimethylammonium chloride mixtures

Hayami, Yoshiteru; Wataya, A.; Takiue, Takanori; Ikeda, Norihiro; Matsubara, Hiroki; Aratono, Makoto

doi:10.1016/j.jcis.2007.01.096

Cited by 7 publications

(1 citation statement)

References 21 publications

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“…In its turn, the morphology of the surfactant assemblies determines the thermodynamic stability and physicochemical properties of the organized systems. − Cationic surfactants are widely involved in various nanotechnological strategies, − and therefore much attention is devoted to the correlation of their chemical structure with their aggregation and functional activity. The nature of head groups markedly affects the aggregation, solubilization, and catalytic properties of cationic surfactants, − with the role of substituents in head groups capable of H-bonding being of particular interest. These investigations are stimulated by the wide application of cationic surfactants as drug and gene carriers, micellar catalysts, emulsifiers, inhibitors of corrosion, and so forth.…”

Section: Introductionmentioning

confidence: 99%

Micellization and Catalytic Properties of Cationic Surfactants with Head Groups Functionalized with a Hydroxyalkyl Fragment

et al. 2012

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The catalytic activity of two homological series of cationic surfactants bearing a hydroxyalkyl fragment in the head groups R(CH 3 ) 2 N + (CH 2 CH 2 OH)Br − and R(CH 3 ) 2 N + (CH 2 CH 2 CH 2 OH)Br − toward the cleavage of the p-nitrophenyl esters of carbonic acids of different hydrophobicity (acetate, caprilate, caprinate, laurate, myristate) is shown to exceed that of typical cationic surfactants with the trimethylammonium (TMA) headgroup. The catalytic effect increases with the alkyl chain length of surfactants and nonmonotonous changes in the series: acetate < caprilate < myristate < laurate < caprinate, reaching 750 times. NMR and IR spectroscopy studies and the surface potential calculations revealed that the higher catalytic effect of hydroxyalkylated surfactants is not due to their higher surface potential and binding capacity toward substrates. This is in line with finding that binding constants for TMA series are higher than for their hydroxyalkylated analogues, which was demonstrated by the fitting of kinetic data in terms of the pseudophase model. The microenvironment factor rather than concentrating effect is responsible for the advanced catalytic properties of hydroxyalkylated surfactants in the micellar phase.

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