期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 412, 期 -, 页码 107-111出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2013.09.014
关键词
Self-assembly; Wormlike micelles; Cylindrical micelles; Viscosity; Light-responsive systems
资金
- National Natural Science Foundation of China [NSFC 20973129, 21273165]
A new class of light-responsive viscoelastic fluids based on anionic wormlike micelles is reported. The key components are sodium oleate (NaOA) and a cationic azobenzene dye, 1-[2-(4-phenylazo-phenoxy)ethyl]-3-methylimidazolium bromide (C(0)AZOC(2)IMB). These binary systems are gel-like fluids at certain concentration ratios of [C(0)AZOC(2)IMB]/[NaOA], e.g. 35/100, owing to the formation of long, entangled wormlike micelles. The viscosity of these fluids can be controlled reversibly by light due to photo isomerization between trans-C(0)AZOC(2)IMB and cis-C(0)AZOC(2)IMB. For example, the zero-shear viscosity (eta(0)) of an originally gel-like sample is high up to similar to 1300 Pa s when C(0)AZOC(2)IMB is in its trans from, whereas the mixture becomes a Newtonian fluid with no about 0.01 Pa s after UV light irradiation. For the post-irradiated cis-C(0)AZOC(2)IMB, short cylindrical micelles form, hence accounting for the lower viscosity. Evidence for the structural transition is provided by UV-vis spectra, rheology, H-1 NMR and cryo-transmission electronic microscopy measurements. (C) 2013 Elsevier Inc. All rights reserved.
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