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Synthesis and Surface-Active Properties of New Photosensitive Surfactants Containing the Azobenzene Group by Ho-Cheol Kang; Byung Min Lee; Jungho Yoon; Minjoong Yoon is a Chemistry article available to read on EtoBox.

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Several water-soluble cationic surfactants, 4-alkylazobenzene-4 -(oxy-2-hydroxypropyl)trimethylammonium methylsulfate (AZMS) (AZMS-0, AZMS-1, AZMS-2, AZMS-4, and AZMS-8), containing alkylglycidylether and azoarene have been synthesized with high yields of 63-78% and their surface-active properties have been investigated upon irradiation with UV/vis light. All of the trans-AZMS surfactants are isomerized to cis-trans mixtures containing 92.5% cis isomer by UV light irradiation at 350 nm. The cis isomers in the mixtures are reverted to trans isomers by visible light irradiation (λ > 445 nm). Such photoisomerization induces changes in the surface activity of each surfactant. The critical micelle concentration (cmc) of the trans form of AZMS-8 surfactant is about 1.28 × 10 -4 mol/l. At the photostationary state, 92.5% of the trans form is changed to the cis form which exhibits a slightly higher cmc (3.41 × 10 -4 mol/l). The new cmc of AZMS surfactants upon photoisomerization is similar to that of the ideal mixed micellar system. In particular, the ratio of cmc cis to cmc trans of AZMS derivatives is about 1.87-2.85 which increases proportionally with the chain length of alkyl group. Th

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Author

Ho-Cheol Kang; Byung Min Lee; Jungho Yoon; Minjoong Yoon

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)

Published

2000

Language

EN

Field

Chemistry (Physical Sciences)