ELECTRON-PARAMAGNETIC RESONANCE LINESHAPE ANALYSIS OF SMALL AND LARGE PROBES INTRODUCED INTO MICELLAR AQUEOUS-SOLUTIONS OF AMMONIUM PENTADECAFLUOROOCTANOATE

被引：39

作者：

RISTORI, S ^{[1
]}

MARTINI, G ^{[1
]}

机构：

[1] UNIV FLORENCE,DEPT CHEM,VIA G CAPPONI 9,I-50121 FLORENCE,ITALY

来源：

LANGMUIR | 1992年 / 8卷 / 08期

关键词：

D O I：

10.1021/la00044a010

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Aqueous micellar solutions of ammonium perfluorooctanoate were studied by using EPR of paramagnetic probes with different characteristics. Small and large cationic probes (namely TempTMA+ and CAT12) and long-chain neutral nitroxides (5- and 16-DXSA) were used to obtain structural and dynamic information. The analysis was mainly carried out in terms of the lineshapes and the hyperfine coupling constants of both experimental and simulated spectra. A large perturbing effect on the micellar system was observed with CAT12. TempTMA+ and 5- and 16-DXSA gave details on the polarity and the motional properties of the micellar surface and in different regions of the micellar core, respectively. All of the long-chain nitroxides allowed us to further investigate the mutual solubility of perfluorinated and perprotiated surfactants.

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页码：1937 / 1942

页数：6

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