Naslov
Structure of Thermotropic Liquid Crystalline Aerosol-OT and its Alkylammonium Salt

Autori
Ungar, Goran ; Tomašić, Vlasta ; Shcherbina, Maxim A ; Zeng, Xianbing

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts / Lee, S.-D. - Seoul : Seoul Nat'l University, 2008, 108-108

Skup
22nd International Liquid Crystal Conference

Mjesto i datum
Jeju City, Republika Koreja, 29.06.2008. - 04.07.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
liquid crystals; alkylammonium salts; Aerosol-OT

Sažetak
Aerosol-OT is a widely used anionic syrfactant, and its lyotropic properties have been studied extensively. Binary, ternary or quaternary systems using AOT display rich phase behavior. However, neat AOT is itself liquid crystalline, a fact that had received little attention. Among the many scientifically interesting aspects of AOT is its analogy with phospholipids. We carried out an X-ray study of neat AOT sodium salt, as well as of AOT - alkylammonium complexes. 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 of tessellated molecules, as shown in the MD simulation snapshot in Figure 1. The structure is trigonal locally, but hexagonal over the long range. This mode of assembly is supported by electron density reconstruction. At subambient temperatures the AOT – alkylammonium complexes, 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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA