UV causes dramatic changes in aggregation with mixtures of photoactive and inert surfactants

Langmuir : the ACS Journal of Surfaces and Colloids
Julian EastoeRichard K Heenan

Abstract

Aqueous mixtures of photosensitive and inert surfactants have been prepared; photoreactions and changes in aggregation after irradiation have been characterized. The photosensitive component was a stilbene-containing gemini photosurfactant (E-SGP), and the inert surfactants were either DTAB (dodecyltrimethylammonium bromide) or one of two different gemini surfactants, 12-4-12 or 16-4-16 (butanediyl-1,4-bis(dodecyldimethylammonium bromide) or butanediyl-1,4-bis(hexadecyldimethylammonium bromide)). Small-angle neutron scattering (SANS) studies revealed that in general the initial nonirradiated mixed systems form vesicle-type aggregates (100-200 angstroms radius), in equilibrium with some smaller charged spheroidal or ellipsoidal micelles (approximately 20 angstroms radius). In all cases, UV irradiation resulted in disruption of these vesicles and the formation of charged micelles. 1H NMR showed that the main photoproduct is the cis, anti, cis dimer of E-SGP (ZEZ-DiSGP); hence, photochemically induced changes in the reactive SGP drive significant changes in the preferred aggregation structure. These results demonstrate the utility of photoactive surfactants in mixtures with inert analogues.

References

Oct 21, 2003·Chemistry : a European Journal·Felaniaina RakotondradanyHanadi F Sleiman

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Citations

Jun 2, 2005·Chemical Communications : Chem Comm·Julian EastoeIsabelle Grillo
Oct 24, 2006·Chemical Communications : Chem Comm·Ana VesperinasRichard K Heenan
Oct 24, 2009·Physical Chemistry Chemical Physics : PCCP·Lijuan WangJinfeng Dong
Mar 12, 2016·Journal of Colloid and Interface Science·Yutaka TakahashiYukishige Kondo
Aug 12, 2009·Journal of Colloid and Interface Science·Xiaoyang Liu, Nicholas L Abbott
Apr 15, 2008·Journal of Colloid and Interface Science·Aihua ZouIsabelle Grillo
Dec 7, 2007·Journal of Colloid and Interface Science·Alireza SalabatRico F Tabor
Jul 24, 2007·Journal of Colloid and Interface Science·Nan GaoRichard K Heenan
Apr 18, 2009·Advances in Colloid and Interface Science·Olesya Myakonkaya, Julian Eastoe
Oct 21, 2005·Soft Matter·Julian Eastoe, Ana Vesperinas
Aug 11, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Tsutomu HamadaTakeshi Nagasaki
May 14, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Yu-Chuan LiuC Ted Lee
May 21, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Lijuan WangJinfeng Dong
Jan 25, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Julian EastoeSean Davis

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