Pregled bibliografske jedinice broj: 140145
Solid phase transitions of n-alkylammonium cholates
Solid phase transitions of n-alkylammonium cholates // Abstract Book / Baglioni, Piero (ur.).
Firenza : München: Univeristy of Florence, 2003. str. 429-429 (poster, međunarodna recenzija, sažetak, znanstveni)
CROSBI ID: 140145 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Solid phase transitions of n-alkylammonium cholates
Autori
Tomašić, Vlasta ; Filipović-Vinceković, Nada
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
Abstract Book
/ Baglioni, Piero - Firenza : München : Univeristy of Florence, 2003, 429-429
Skup
17th ECIS Conference
Mjesto i datum
Firenca, Italija, 21.09.2003. - 26.09.2003
Vrsta sudjelovanja
Poster
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
catanionic surfactants; solid phase transitions
Sažetak
Novel series of catanionic surfactants n-alkylammonium cholates (the number of carbon atoms per chain being n = 10, 12, 14, 16) was prepared and characterized by elemental and thermogravimetric analysis, IR and NMR spectroscopy. The influence of the alkyl chain length on the structural and thermal properties was investigated by means of polarizing microscopy, differential scanning calorimetry and X-ray diffraction. All compounds exhibited a complex polymorphism and thermotropic mesomorphis from the stable crystalline form to the isotropic phase. On heating two main phase transition transition were observed for all compounds: solid to liquid crystalline phase transition and isotropization. The liquid crystalline phases exhibited textures characteristic for smectic A phase (SA). The extent of crystallinity, temperatures of phase transitions, thermodynamic parameters, and basic lamellar thickness varied linearly with the increase of the alkylammonium chain length.
Izvorni jezik
Engleski
Znanstvena područja
Kemija
