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Azobenzene moiety variation directing self-assembly and photoresponsive behavior of azo-surfactants

Peng, Shuhua, Guo, Qipeng, Hartley, Patrick G. and Hughes, Timothy C. 2014, Azobenzene moiety variation directing self-assembly and photoresponsive behavior of azo-surfactants, Journal of Materials Chemistry C, vol. 2, no. 39, pp. 8303-8312, doi: 10.1039/c4tc00321g.

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Title Azobenzene moiety variation directing self-assembly and photoresponsive behavior of azo-surfactants
Author(s) Peng, Shuhua
Guo, Qipeng
Hartley, Patrick G.
Hughes, Timothy C.
Journal name Journal of Materials Chemistry C
Volume number 2
Issue number 39
Start page 8303
End page 8312
Total pages 10
Publisher Royal Society of Chemistry
Place of publication Cambridge, United Kingdom
Publication date 2014-10-21
ISSN 2050-7534
2050-7526
Summary The effect of varying the position of the azobenzene group within two comparable photoresponsive amphiphiles on their capability to form lyotropic liquid crystals (LLCs) was investigated in detail in this study. Two photoresponsive amphiphiles having comparable structures were designed and synthesized consisting of hydrophilic oligooxyethylene units, a hydrophobic alkyl chain and a light-sensitive azobenzene moiety. When the azobenzene group was located in the middle of the hydrophobic alkyl chain, multiple LLC phases were observed at various water contents in the azo-surfactant–water binary system. In contrast, when the azobenzene group was directly attached to the hydrophilic domain, the azo-surfactant–water binary system exhibited only lamellar phases. The temperature dependence of these self-organised nanostructures was also investigated by the combination of small angle X-ray scattering (SAXS), differential scanning calorimetry (DSC), and rheology. Under alternating UV and visible light irradiation, reversible trans–cis photoisomerization of the azobenzene group occurred efficiently in dilute solution for both azo-surfactants. However, only photoisomerization of the surfactant possessing the azobenzene group localized in the middle of the alkyl chain induced significant changes in the self-assembled structure and its bulk properties. This study demonstrates that self-assembly and photoresponsive behaviour of photosensitive amphiphiles is extremely sensitive to the position of the photoactive moiety within the surfactant molecular architecture.
Language eng
DOI 10.1039/c4tc00321g
Field of Research 091299 Materials Engineering not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Royal Society of Chemistry
Free to Read? Yes
Use Rights Creative Commons Attribution licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30070486

Document type: Journal Article
Collections: Institute for Frontier Materials
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.