The role of charged surfactants in the thermal and structural properties of lyotropic liquid crystalline mesophases of [Zn(H2O)6](NO3)2-CnEOm-H2O

Date
2010
Authors
Albayrak, C.
Soylu, A. M.
Dag, Ö.
Advisor
Instructor
Source Title
Journal of Colloid and Interface Science
Print ISSN
0021-9797
Electronic ISSN
1095-7103
Publisher
Volume
341
Issue
1
Pages
109 - 116
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Abstract

The mixtures of Zn(H2O)62 salt, 10-lauryl ether (C12H25(OCH2CH2)10OH, represented as C12EO10), a charged surfactant (cetyltrimethylammonium bromide, C16H33N(CH3)3Br, represented as CTAB or sodium dodecylsulfate, C12H25OSO3Na, SDS) and water form lyotropic liquid crystalline mesophases (LLCM). This assembly accommodates up to 8.0 Zn(II) ions (corresponds to about 80% w/w salt/(salt + C12EO10)) for each C12EO10 in the presence of a 1.0 CTAB (or 0.5 SDS) and 3.5 H2O in its LC phase. The salt concentration can be increased by increasing charged surfactant concentration of the media. Addition of charged surfactant to the Zn(H2O)62–C12EO10 mesophase not only increases the salt content, it can also increase the water content of the media. The charged surfactant-C12EO10 (hydrophobic tail groups) and the surfactant (head groups)-salt ion (ion-pair, hydrogen-bonding) interactions stabilize the mesophases at such salt high and water concentrations. The presence of both Br and NO 3 ions influences the thermal and structural properties of the Zn(H2O)62–C12EO10–CTAB(or SDS)–H2O LLCM, which have been investigated using XRD, POM (with a hot stage), FT-IR and Raman techniques.

Course
Other identifiers
Book Title
Keywords
C12EO10, CTAB, SDS, Lyotropic liquid crystals, Transition metal salt, Mesophase
Citation
Published Version (Please cite this version)