Inorganic mesoporous materials with chiral nematic structures and preparation method thereof
US8623237B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 31, 2011 |
| Grant date | Jan 7, 2014 |
| Priority date | — |
| Expiry date | Aug 22, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/43
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention describes a composition and a method for producing mesoporous silica materials with a chiral organization. In the method, a polymerizable inorganic monomer is reacted in the presence of nanocrystalline cellulose (NCC) to give a material of inorganic solid with cellulose nanocrystallites embedded in a chiral nematic organization. The NCC can be removed to give a stable porous structure that retains the chiral organization of the NCC template. The new materials may be obtained as iridescent free-standing films with high surface area. Through control of the reaction conditions, the color of the films can be varied across the entire visible spectrum. These are the first materials to combine mesoporosity with long-range chiral ordering that leads to photonic properties. Examples of possible applications of the materials are: lightweight reinforcement materials, low k dielectric materials, tunable reflective filters, adsorbents, stationary phases for chromatography of chiral or achiral substances, supports for catalysts (e.g., for asymmetric synthetic transformations), and as a template to generate other new porous materials (e.g., porous carbon or porous metals), p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.