Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
87 (2000), S. 2084-2089
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We report the detailed temperature variation of the dielectric constant across the nematic-isotropic transition in both the normal and UV-irradiated states of a commercially available room temperature nematic mixture (E7 from E-Merck) doped with a small quantity (4.5 mol %) of a liquid crystalline azo compound. The photoirradiation was done using a very low power (0.1 mW/cm2) UV source. Data of time-resolved measurements of the dielectric constant through both the UV-activated "trans-cis" transformation and the thermal back relaxation process are also presented and compared with time-dependent absorbance data. Even for this low concentration of the photoactive material, UV irradiation of as small a magnitude as 0.1 mW/cm2 is observed to lower the nematic-isotropic transition temperature by 15 °C. © 2000 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.372142
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