Liquid crystal nose based on chiral photonic bandgap materials: principles of selective response
Abstract
Chiral liquid crystalline (LC) compositions with the selective reflection band (SRB) in a visible spectral range are suggested and studied as elements of LC-nose. This allows for optical detection of several volatile organic compounds (VOCs): SRB shifts and color of the sample changes under the action of VOCs. Ethanol, toluene, pyridine and acetic acid were detected by means of colorimetric and spectroscopic techniques during their diffusion inside chiral elements of LC-nose. Selectivity to different VOCs is enhanced by means of components of liquid crystal matrix with different viscosity, affinities to the solvents, and abilities to form hydrogen bonding.
- Publication:
-
Applied Physics A: Materials Science & Processing
- Pub Date:
- November 2020
- DOI:
- 10.1007/s00339-020-04102-3
- arXiv:
- arXiv:2003.01832
- Bibcode:
- 2020ApPhA.126..920S
- Keywords:
-
- Cholesteric liquid crystals;
- Gases;
- Volatile organic compounds;
- Chirality;
- Detection;
- Liquid crystal nose;
- Condensed Matter - Materials Science;
- Condensed Matter - Soft Condensed Matter
- E-Print:
- doi:10.1007/s00339-020-04102-3