Reversible photorheological lyotropic liquid crystals

Peng, Shuhua, Guo, Qipeng, Hughes, Timothy C and Hartley, Patrick G 2014, Reversible photorheological lyotropic liquid crystals, Langmuir, vol. 30, no. 3, pp. 866-872, doi: 10.1021/la4030469.

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Title Reversible photorheological lyotropic liquid crystals
Author(s) Peng, Shuhua
Guo, QipengORCID iD for Guo, Qipeng
Hughes, Timothy C
Hartley, Patrick G
Journal name Langmuir
Volume number 30
Issue number 3
Start page 866
End page 872
Total pages 7
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 2014
ISSN 0743-7463
Summary We describe novel lyotropic liquid-crystalline (LLC) materials based on photoresponsive amphiphiles that exhibit rapid photoswitchable rheological properties of unprecedented magnitude between solidlike and liquidlike states. This was achieved through the synthesis of a novel azobenzene-containing surfactant (azo-surfactant) that actuates the transition between different LLC forms depending on illumination conditions. Initially, the azo-surfactant/water mixtures formed highly ordered and viscous LLC phases at 20-55 wt % water content. Spectroscopic, microscopic, and rheological analysis confirmed that UV irradiation induced the trans to cis isomerization of the azo-surfactant, leading to the disruption of the ordered LLC phases and a dramatic, rapid decrease in the viscosity and modulus resulting in a 3 orders of magnitude change from a solid (20,000 Pa) to a liquid (50 Pa) at rate of 13,500 Pa/s. Subsequent exposure to visible light reverses the transition, returning the viscosity essentially to its initial state. Such large, rapid, and reversible changes in rheological properties within this LLC system may open a door to new applications for photorheological fluids.
Language eng
DOI 10.1021/la4030469
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, American Chemical Society
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