Mind the Microgap in Iridescent Cellulose Nanocrystal Films
Susete N Fernandes1, Pedro L Almeida1,2, Nuno Monge1,3,4
1i3N/CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516, Caparica, Portugal.
Advanced Materials (Deerfield Beach, Fla.)
|November 19, 2016
Summary
Researchers created a novel photonic structure using cellulose nanocrystal films. This structure can be tuned with electric fields or temperature changes, offering tunable optical properties.
Area of Science:
- Materials Science
- Optics
- Nanotechnology
Background:
- Cellulose nanocrystals (CNCs) offer unique optical properties.
- Cholesteric liquid crystals exhibit tunable iridescence.
- Integrating different materials can lead to novel photonic devices.
Purpose of the Study:
- To develop a new tunable photonic structure.
- To combine CNCs and liquid crystals for advanced optical applications.
- To investigate the tunability of the structure using external stimuli.
Main Methods:
- Fabrication of cellulose nanocrystal iridescent films.
- Creation of micrometer-scale planar gaps between cholesteric domains.
- Impregnation of gaps with nematic liquid crystals.
- Application of electric fields and temperature variations to tune the structure.
Main Results:
- A novel photonic structure was successfully produced.
- The structure exhibits tunable optical properties.
- Reversible tuning was achieved via electric fields and temperature variations.
Conclusions:
- The developed photonic structure demonstrates tunable optical characteristics.
- This work presents a new method for creating advanced photonic materials.
- The tunable nature of the structure has potential applications in optical devices.
