Photochemical Control of Molecular Assembly Formation in a Catanionic Surfactant System

Citations Over TimeTop 12% of 2011 papers

Abstract

Photochemical control of vesicle disintegration and reformation in aqueous solution was examined using a mixture of 4-butylazobenzene-4′-(oxyethyl)trimethylammonium bromide (AZTMA) as the photoresponsive cationic surfactant and sodium dodecylbenzenesulfonate (SDBS) as the anionic surfactant. Spontaneous vesicle formation was found in a wide-ranging composition of the trans-AZTMA/SDBS system. AZTMA molecules constituting vesicles underwent reversible trans−cis photoisomerization when irradiated with ultraviolet and visible light. Transmission electron microscopy observations using the freeze−fracture technique (FF-TEM) showed that UV light irradiation caused the vesicles to disintegrate into coarse aggregates and visible light irradiation stimulated the reformation of vesicles (normal control). A detailed investigation of the phase state and the effects of UV and visible light irradiation on the AZTMA/SDBS system with the use of electroconductivity, dynamic/static light scattering, and surface tension measurements and FF-TEM observations revealed that in the AZTMA-rich composition (AZTMA/SDBS 9:1) a micellar solution before light irradiation became a vesicular solution after UV light irradiation and visible light irradiation allowed the return to a micellar solution (reverse control). Thus, we could photochemically control the disintegration (normal control) and reformation (reverse control) of vesicles in the same system.

Related Papers

• → Ru-catalyzed ortho-oxidative alkenylation of 2-arylbenzo[d]thiazoles in aqueous solution of anionic surfactant sodium dodecylbenzenesulfonate (SDBS)(2016)23 cited
• → The exchange polarization model of photoisomerization: A rationale for profound solvent effects on photoisomerization of trans-stilbene and all-trans retinal(1996)26 cited
• → The Amorphism of the Polycrystal Phase Transition in the Course Of Cis-Trans Photoisomerization(1978)10 cited
• → Amount of Sodium Alkylbenzenesulfonate Remained on the Rinsed Tablewares and Vegetable which were Washed with its Aqueous Solution(1962)1 cited
• → Real-time tracking of phytochrome's ring D orientational changes during Pr photoisomerization: Two Pr isoforms with different photoisomerization yields(2013)