Ordering Phenomena in Surfactant Systems: From Micellar Solutions to Gel and Crystalline Phases

Autor:	Oleksandr I. Ivankov, C. R. Haramagatti, Alexander I. Kuklin, Götz Eckold, Ahmed Kh. Islamov, Holger Gibhardt
Rok vydání:	2015
Předmět:	Materials science Small-angle neutron scattering law.invention symbols.namesake Pulmonary surfactant Chemical engineering law Micellar solutions symbols Micellar cubic lipids (amino acids peptides and proteins) Physical and Theoretical Chemistry Crystallization Raman spectroscopy
Zdroj:	Zeitschrift für Physikalische Chemie. 229:1869-1885
ISSN:	2196-7156 0942-9352
DOI:	10.1515/zpch-2015-0609
Popis:	The phase behavior of surfactant systems is investigated using alkyltrimethylammonium bromide surfactants with different alkyl chain lengths (dodecyl-, tetradecyl-, hexadecyl- and octadecyl) as model substances. The transitions between micellar solution, gel-phase and crystalline phase are characterized by the combination of Raman spectroscopy and small angle neutron scattering. It is demonstrated that in systems with small surfactant molecules the aqueous solution crystallizes directly on cooling to form hydrated crystals while an intermediate gel phase is observed in long chain systems. The cross-over is found for the hexadecyl-compound where the gel phase appears only at high concentrations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d19100ca2eb8406c83c41f6aff3b964e https://doi.org/10.1515/zpch-2015-0609 Zobrazit plný text záznamu