Control of nanocrystalline cellulose film iridescence wavelength
US9394481B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2013 |
| Grant date | Jul 19, 2016 |
| Priority date | — |
| Expiry date | May 31, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2207/101
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A new method to control the iridescence color of solid nanocrystalline cellulose (NCC) films by ultrasound and high-shear (mechanical) energy input to the NCC suspension prior to film formation is provided. As the energy input to the NCC suspension increases, the resulting film color shifts from the ultraviolet region towards the infrared region of the electromagnetic spectrum; this wavelength shift lies in the opposite direction to that caused by the addition of electrolytes to NCC suspensions prior to film formation. No additives are required to achieve the changes in color; color changes can also be effected by mixing two suspensions exposed to different levels of sonication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.