Simoncelli, S;
Aramendia, PF;
(2015)
Chiral power change upon photoisomerization in twisted nematic liquid crystals.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
, 142
pp. 94-100.
10.1016/j.saa.2015.01.072.
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Abstract
In this work, we use the photoisomerization of azobenzenes, a phenanthrospirooxazine, and a fulgide in a twisted nematic liquid crystalline phase to change the chiral twisting power of the system. The changes are probed by the rotatory power of linearly polarized light. Time resolved and steady state experiments are carried out. The chiral change and the photoisomerization process have similar characteristic recovery times and activation energy, thus probing that the change is induced by the modification in the chemical composition of the photochromic dopant system. The amplitude of the light twisting power change correlates with the order change in the liquid crystal (LC) but not with the modification in the absorption characteristics of the system. This indicates that the driving force of the chiral change is the microscopic order modification in the LC phase that affects the helical pitch of the phase.
| Type: | Article |
|---|---|
| Title: | Chiral power change upon photoisomerization in twisted nematic liquid crystals |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.saa.2015.01.072 |
| Publisher version: | https://doi.org/10.1016/j.saa.2015.01.072 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10089461 |
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