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Structure of Liquid Crystalline Aerosol-OT and its Alkylammonium Salts (CROSBI ID 149936)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Ungar, Goran ; Tomašić, Vlasta ; Xie, Fangning ; Zeng, Xiang-bing Structure of Liquid Crystalline Aerosol-OT and its Alkylammonium Salts // Langmuir, 25 (2009), 18; 11067-11072. doi: 10.1021/la901385n

Podaci o odgovornosti

Ungar, Goran ; Tomašić, Vlasta ; Xie, Fangning ; Zeng, Xiang-bing

engleski

Structure of Liquid Crystalline Aerosol-OT and its Alkylammonium Salts

Aerosol-OT is a widely used anionic surfactant, and its lyotropic properties have been studied extensively. However, neat AOT is itself liquid crystalline. We carried out an X-ray study of neat AOT sodium salt, as well as of AOT -n-decyl-, n-dodecyl-, n-tetradecyl-, and n-hexadecylammonium salts. We confirm an earlier report that pure AOT forms a hexagonal columnar phase, but propose a different packing model. This involves a relatively highly ordered structure with each column cross-section containing three tessellated molecules in the plane normal to the column axis. The structure is trigonal locally, but hexagonal over the long range. This mode of assembly is supported by electron density reconstruction and molecular modelling. At subambient temperatures the AOT – alkylammonium complexes Cn-AOT, with n = 10-16, also display a hexagonal columnar phase, but this is more disordered and each column cross-section contains only two ion pairs. Unusually, molar enthalpy and entropy of the columnar-isotropic transition in Cn-AOT salts decrease with increasing n. This is attributed to a disproportionally high conformational disorder of the radial chains in the columnar phase, which is required for efficient space filling.

catanionic surfactants

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Podaci o izdanju

25 (18)

2009.

11067-11072

objavljeno

0743-7463

1520-5827

10.1021/la901385n

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