Amphiphilic properties of dodecylammonium chloride/sodium 4-(1-pentylheptyl) benzenesulfonate aqueous mixtures and study of the catanionic complex

Mihelj, Tea; Tomašić, Vlasta (2014) Amphiphilic properties of dodecylammonium chloride/sodium 4-(1-pentylheptyl) benzenesulfonate aqueous mixtures and study of the catanionic complex. Journal of Surfactants and Detergents, 17 (2). pp. 309-321. ISSN 1097-3958

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Abstract

Surfactants are often used in supramolecular chemistry, due to their ability to self-organize. Surfactant molecules aggregate spontaneously and reversibly to adopt a defined intermolecular arrangement. In this work, general phase behavior, adsorption and association in aqueous mixtures of dodecylammonium chloride, DACl and sodium 4-(1-pentylheptyl)benzenesulfonate, NaDBS, were studied by a combination of techniques including surface tension and conductivity measurements, light scattering and optical microscopy. The strong synergistic properties of the system were brought out with the Regular Solution Theory.Various colloidal objects are observed in wide range of composition: conventional small vesicles, large giant multilamellar or multivesicular vesicles. An excess of NaDBS provides extremely large tubular and elongated multilamellar vesicles. The new catanionic 1:1 complex, dodecylammonium 4-(1-pentylheptyl) benzenesulfonate, formed in the equimolar conditions is a result of intramolecular charge neutralization. The thermal properties of this solid compound were examined by thermal polarizing microscopy, differential scanning calorimetry, and X-ray diffraction. The most probable ion-pair amphiphilic cluster of crystal smectic phase, at room temperature, consists of ionic groups formed in ordered layers with dodecyl chains packed into somewhat disordered layers, tilted to the layer plane.

Item Type:	Article
Uncontrolled Keywords:	surfactant mixtures; catanionic surfactant; mesomorphism; wide angle X-ray scattering; dodecylammonium 4-(1-pentylheptyl) benzenesulfonate
Subjects:	NATURAL SCIENCES > Chemistry NATURAL SCIENCES > Chemistry > Physical Chemistry
Divisions:	Division of Physical Chemistry
Projects:	Project title Project leader Project code Project type Surfactants, processes in solutions and at interfaces (Površinski aktivne tvari, procesi u otopinama i na međupovršinama)- Maja Dutour Sikirić 098-0982915-2949 MZOS
Depositing User:	Tea Mihelj
Date Deposited:	02 Dec 2015 09:36
URI:	http://fulir.irb.hr/id/eprint/2338
DOI:	10.1007/s11743-013-1504-y

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