Abstract
The fabrication of shape memory coatings that change both reflectivity and topography is hampered by the lack of facile methods and materials. Now, shape memory photonic coatings are fabricated by high-speed flexographic printing and UV-curing in air of a chiral nematic liquid crystal ink. Deformable polymeric films with a red reflection band and a smooth surface topography are obtained which can be thermally programmed above room temperature by using a rough stamp. This thermomechanical programming results in a temporary rough surface topography leading to surface scattering and as a result a gray color below room temperature. By heating the coatings, a shape recovery to the permanent state is observed, thereby restoring the smooth surface topography and the iridescent red reflection color. It is shown that this recovery is highly temperature dependent, which allows for a fast and distinct optical and topography change upon exceeding room temperature. These thermoresponsive photonic crystal coatings have a great potential as low-cost optical sensors, smart adhesives, and adaptive biosurfaces.
| Language | English |
|---|---|
| Article number | 1900592 |
| Journal | Advanced Optical Materials |
| DOIs | |
| State | E-pub ahead of print - 19 Jun 2019 |
Fingerprint
Keywords
- chiral nematic
- cholesteric
- liquid crystals
- photonic crystals
- sensors
- shape memory
- thermoresponsive
Cite this
}
Photonic shape memory chiral nematic polymer coatings with changing surface topography and color. / Nickmans, Koen; van der Heijden, Danielle A.C.; Schenning, Albert P.H.J. (Corresponding author).
In: Advanced Optical Materials, 19.06.2019.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Photonic shape memory chiral nematic polymer coatings with changing surface topography and color
AU - Nickmans,Koen
AU - van der Heijden,Danielle A.C.
AU - Schenning,Albert P.H.J.
PY - 2019/6/19
Y1 - 2019/6/19
N2 - The fabrication of shape memory coatings that change both reflectivity and topography is hampered by the lack of facile methods and materials. Now, shape memory photonic coatings are fabricated by high-speed flexographic printing and UV-curing in air of a chiral nematic liquid crystal ink. Deformable polymeric films with a red reflection band and a smooth surface topography are obtained which can be thermally programmed above room temperature by using a rough stamp. This thermomechanical programming results in a temporary rough surface topography leading to surface scattering and as a result a gray color below room temperature. By heating the coatings, a shape recovery to the permanent state is observed, thereby restoring the smooth surface topography and the iridescent red reflection color. It is shown that this recovery is highly temperature dependent, which allows for a fast and distinct optical and topography change upon exceeding room temperature. These thermoresponsive photonic crystal coatings have a great potential as low-cost optical sensors, smart adhesives, and adaptive biosurfaces.
AB - The fabrication of shape memory coatings that change both reflectivity and topography is hampered by the lack of facile methods and materials. Now, shape memory photonic coatings are fabricated by high-speed flexographic printing and UV-curing in air of a chiral nematic liquid crystal ink. Deformable polymeric films with a red reflection band and a smooth surface topography are obtained which can be thermally programmed above room temperature by using a rough stamp. This thermomechanical programming results in a temporary rough surface topography leading to surface scattering and as a result a gray color below room temperature. By heating the coatings, a shape recovery to the permanent state is observed, thereby restoring the smooth surface topography and the iridescent red reflection color. It is shown that this recovery is highly temperature dependent, which allows for a fast and distinct optical and topography change upon exceeding room temperature. These thermoresponsive photonic crystal coatings have a great potential as low-cost optical sensors, smart adhesives, and adaptive biosurfaces.
KW - chiral nematic
KW - cholesteric
KW - liquid crystals
KW - photonic crystals
KW - sensors
KW - shape memory
KW - thermoresponsive
UR - http://www.scopus.com/inward/record.url?scp=85067452985&partnerID=8YFLogxK
U2 - 10.1002/adom.201900592
DO - 10.1002/adom.201900592
M3 - Article
JO - Advanced Optical Materials
T2 - Advanced Optical Materials
JF - Advanced Optical Materials
SN - 2195-1071
M1 - 1900592
ER -