Diverse actions of added alkanols on the binding of dibucaine cation to an anionic polymer

Shirahama, Keishiro; Koga, Hideyuki; Takisawa, Noboru

doi:10.1007/3-540-36114-6_10

Cited by 1 publication

(1 citation statement)

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“…Overall, addition of alcohols is known to produce multiple changes in surfactant − and polymer−surfactant aggregates. − In terms of packing parameters ( P ), aliphatic alcohols have P larger than 1, indicating their preference for inversed micelle morphologies. Upon mixing with single tail ionic surfactants, such as HTAB, which have P in the order of 1 / 3 − 1 / 2 and prefer spherical or cylindrical micelle morphology, the alcohols increase the average packing parameter.…”

Section: Resultsmentioning

confidence: 99%

Fluorescence Anisotropy Study of Aqueous Dispersions of Block Ionomer Complexes

et al. 2005

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Block ionomer complexes (BIC) of "dual hydrophilic" block copolymers containing ionic and nonionic blocks and oppositely charged surfactants spontaneously form colloidal particles of ca. 80 nm in diameter stable in aqueous dispersions at every composition of the mixture. Packing and dynamics of aliphatic groups of the surfactant in BIC were examined by using the quenching-resolved fluorescence anisotropy (QRFA) method with 1,6-diphenyl-1,3,5-hexatriene (DPH) as a probe. The values of the order parameter and rotational relaxation time in the BIC were higher than those in the surfactant micelles. Incorporation of aliphatic alcohols in the BIC decreased the order parameter and increased the rotational relaxation time. The effects on the order parameter were explained by changes in the surfactant aliphatic group conformation to "fill the gaps" induced by insertion of shorter alcohol molecules. The effects on the relaxation time were attributed to a decrease in repulsion of the surfactant headgroups and expulsion of water from the BIC hydrophobic interior as evidenced by the decrease in micropolarity. The results of this study have implications for potential use of the BIC in pharmaceutics and other fields.

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