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X-ray absorption fine structure of bromide ions attracted by cationic surfactants at the heptane-water interface

Hajime Tanida1, Hirohisa Nagatani2 and Makoto Harada3

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The total-reflection X-ray spectroscopic technique was applied to an interfacial species at the liquid-liquid interface. The XAFS spectrum of bromide ions at the heptane-water interface was successfully obtained in the fluorescence mode. A slight change in the spectra was observed in the presence of the cationic surfactants, dimethyldilaurylammonium and stearyltrimethylammonium ions. This suggested that the hydrated structure of bromide ions attracted by the cationic surfactants at the heptane-water interface is different from neat interfaces or bulk aqueous phases.


PACS

68.05.Cf Liquid-liquid interface structure: measurements and simulations

78.70.En X-ray emission spectra and fluorescence

78.55.Bq Liquids

78.70.Dm X-ray absorption spectra

Subjects

Soft matter, liquids and polymers

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Dates

Issue 1 (2009)



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