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Dynamic high contrast reflective coloration from responsive polymer/cholesteric liquid crystal architectures
| Content Provider | Semantic Scholar |
|---|---|
| Author | Mcconney, Michael E. White, Timothy J. Tondiglia, Vincent P. Natarajan, Lalgudi V. Yang, Deng-Ke Bunning, Timothy J. |
| Copyright Year | 2012 |
| Abstract | We report on high reflectivity CLC structures (R > 50%) whose wavelength can be thermally tuned reversibly by a de-swelling/re-swelling transition unique to ordered solvent-gel systems. The system contains no chiral dopant and the coloration is completely induced by a responsive chiral structured gel. The de-swelling transition, leading to blue tuning, occurs at the nematic-isotropic transition of the liquid crystal, which is a result of a mismatch in the orientational energy of the isotropic liquid crystal and the anisotropic gel. The re-swelling transition subsequently occurs at the nematic-isotropic transition of gel, due to the miscibility of the isotropic liquid crystal and the isotropic gel, which induces a red-shift in the coloration. Examination of varying clearing point liquid crystal solvents, contact angle measurements, and white light optical profilometry localized thickness measurements shed light on this de-swelling/re-swelling transition. A dynamic, high reflectivity cell was demonstrated by combining both a left-handed chiral gel with a right handed chiral gel, both of whose initial periodicities were equal. Heating of this so-called hyper-reflective cell drove reversible and large scale wavelength changes (100's of nm) while maintaining large reflectivity (R ∼ 90%). |
| Starting Page | 318 |
| Ending Page | 323 |
| Page Count | 6 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C1SM05980G |
| Volume Number | 8 |
| Alternate Webpage(s) | https://works.bepress.com/deng-ke_yang/7/download/ |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
