Thermotropic phase behavior of triple-chained catanionic surfactants with varying headgroup chemistry

• Type: Article in International Scientific Journal
• Date: 2006

Authors

Marques, EF (Author) FCUP; Brito, RO (Author) Other; Wang, YJ (Author) Other; Silva, BFB (Author) Other

Journal

Title: Journal of Colloid and Interface Science

Vol. 294

Pages: 240-247

ISSN: 0021-9797

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 36 Citations

Scopus - 38 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-004-NFR

DOI: 10.1016/j.jcis.2005.07.021

Abstract (EN): Catanionic surfactants result from the pairing of oppositely charged amphiphilic molecules, forming a new class of surfactant molecules with various interesting lyotropic and thermotropic properties. With the aim of probing the role of both headgroup chemical nature/structure and molecular shape, a series of catanionic surfactants were synthesized. The cationic portion of the molecule is kept constant, being the dioctadecyldimethylammonium double chain. Different single-chained surfactants with varying headgroups and chain lengths are used as the anionic pair. The thermotropic behavior has been studied by DSC and the mesophase structural investigated by polarizcd light microscopy. The results indicate that, for a given chain length, parameters such as headgroup polarity and charge density, as well as volume, influence the catanionic surfactant behavior. The thermodynamic parameters are qualitatively evaluated, considering the headgroup chemical nature and the overall molecular structure.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8