Naslov
Structure and Dynamics of Vesicles from Symmetrical Double Chain Alkylbenzenesulphonates

Autori
Jalšenjak, Nenad ; Judaš, Nenad ; Štefanić, Igor ; Šegota, Suzana ; Haas, Stefan

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

Izvornik
12th Conference of the European Colloid and Interface Society : Book of Abstracts / Težak, Đurđica - Zagreb : Sveučilište u Zagrebu, 1998, 46-46

Skup
12th Conference of the European Colloid and Interface Society

Mjesto i datum
Cavtat, Hrvatska, 20.09.1998. - 25.09.1998

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
liquid crystals ; surfactants ; vesicles

Sažetak
Symetrical double-chain sodium 1’-(7)- tridecylbenzensulphonate (7STBS) was prepared by conventional methods from reagent-grade starting materials. Appro-priate symmetrical ketone reacts with phenylmagnesium bromide in Grignard reaction, giving tertiary alcohol A. Hydrogenation of A over palladium in cold acetic acid gives alkyl-substituted benzene, which, upon sulphonation by Doe's procedure, and neutralzation of resulting sulphonic acid, yields sodium salt. The samples were observed at room temperature using a polarized light microscope operated with differential interference contrast optics. In the dilute regime the formation of either lamellar bilayers and multilayers or vesicles were found. It was shown that the particles belong to a multilamellar vesicle phase. The texture observed in the polarization microscope without using the I plate showed the sparcling particles. Particles diameters of freshly prepared systems were found to be 75 - 220 nm relating to the surfactant 0.5 - 7 %, and 150 - 310 nm by aged systems with the surfactants 0.5 - 1.5 %, respectively. The time dependent shift in the vesicle/lamellar phase transition of the macroscopically equilibrated systems could be supposed to be a low energy transition. In addition, dynamic light scattering determination showed that some structural changes occured by aging the samples. The transition between the vesicles and lamellae was governed also by the concentration and temperature change.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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