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Effect of UV-light irradiation on phase diagram of lyotropic chromonic liquid crystal
- Source :
- Journal of Molecular Liquids. 267:96-99
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- We demonstrate that the phase diagram of a Lyotropic Chromonic Liquid Crystal (LCLC) is affected by ultraviolet (UV) light irradiation. UV-irradiation induces a phase transition from the nematic (N) to isotropic (I) state at a fixed temperature. Birefringence measured in-situ decreases under irradiation, until the moment when the isotropic phase starts to nucleate and the initial homogeneous nematic transforms into a biphasic state. On further irradiation the birefringence of the N fraction of the biphasic I-N state increases revealing redistribution of the composition components between the two coexisting phases. The efficiency of the irradiation-induced changes depends on the orientation of the chromonic aggregates w.r.t. the polarization of UV light. Changes of the birefringence are noticeably higher for light polarization perpendicular to the nematic director. The effect can be understood as a photo-induced weakening of the face-to-face molecular attraction within the chromonic aggregates and the resulting shortening of these aggregates.
- Subjects :
- Phase transition
Materials science
Birefringence
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
Polarization (waves)
01 natural sciences
Atomic and Molecular Physics, and Optics
0104 chemical sciences
Electronic, Optical and Magnetic Materials
Chemical physics
Liquid crystal
Lyotropic
Materials Chemistry
Chromonic
Irradiation
Physical and Theoretical Chemistry
0210 nano-technology
Spectroscopy
Phase diagram
Subjects
Details
- ISSN :
- 01677322
- Volume :
- 267
- Database :
- OpenAIRE
- Journal :
- Journal of Molecular Liquids
- Accession number :
- edsair.doi...........ee285a60b8beb5e08fc00f8f435a0dd6