Effect of hygroscopicity of the metal salts on the formation and air stability of lyotropic liquid crystalline mesophases in hydrated salt-surfactant systems

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dc.citation.epage33en_US
dc.citation.spage26en_US
dc.citation.volumeNumber433en_US
dc.contributor.authorAlbayrak, C.en_US
dc.contributor.authorBarım, G.en_US
dc.contributor.authorDag, Ö.en_US
dc.date.accessioned2015-07-28T12:02:07Z
dc.date.available2015-07-28T12:02:07Z
dc.date.issued2014-11-01en_US
dc.departmentDepartment of Chemistryen_US
dc.description.abstractIt is known that alkali, transition metal and lanthanide salts can form lyotropic liquid crystalline (LLC) mesophases with non-ionic surfactants (such as CiH2i+1(OCH2CH2)jOH, denoted as CiEj). Here we combine several salt systems and show that the percent deliquescence relative humidity (%DRH) value of a salt is the determining parameter in the formation and stability of the mesophases and that the other parameters are secondary and less significant. Accordingly, salts can be divided into 3 categories: Type I salts (such as LiCl, LiBr, LiI, LiNO3, LiClO4, CaCl2, Ca(NO3)2, MgCl2, and some transition metal nitrates) have low %DRH and form stable salt–surfactant LLC mesophases in the presence of a small amount of water, type II salts (such as some sodium and potassium salts) that are moderately hygroscopic form disordered stable mesophases, and type III salts that have high %DRH values, do not form stable LLC mesophases and leach out salt crystals. To illustrate this effect, a large group of salts from alkali and alkaline earth metals were investigated using XRD, POM, FTIR, and Raman techniques. Among the different salts investigated in this study, the LiX (where X is Cl, Br, I, NO3 , and ClO4 ) and CaX2 (X is Cl, and NO3 ) salts were more prone to establish LLC mesophases because of their lower %DRH values. The phase behavior with respect to concentration, stability, and thermal behavior of Li(I) systems were investigated further. It is seen that the phase transitions among different anions in the Li(I) systems follow the Hofmeister series.en_US
dc.identifier.doi10.1016/j.jcis.2014.07.008en_US
dc.identifier.issn0021-9797
dc.identifier.urihttp://hdl.handle.net/11693/12598
dc.language.isoEnglishen_US
dc.publisherElsevieren_US
dc.relation.isversionofhttp://dx.doi.org/10.1016/j.jcis.2014.07.008en_US
dc.source.titleJournal of Colloid and Interface Scienceen_US
dc.subjectLyotropic Liquid Crystalen_US
dc.subjectDeliquescenceen_US
dc.subjectLithium saltsen_US
dc.subjectHygroscopicityen_US
dc.subjectSurfactantsen_US
dc.titleEffect of hygroscopicity of the metal salts on the formation and air stability of lyotropic liquid crystalline mesophases in hydrated salt-surfactant systemsen_US
dc.typeArticleen_US

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