Synthesis of columnar hydrogel colloidal crystals in water-organic solvent mixture
US7989505B2 · kind B2 · utility
23Cited by
3References
20Claims
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Key dates
| Filing date | Sep 21, 2006 |
| Grant date | Aug 2, 2011 |
| Priority date | — |
| Expiry date | Apr 28, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B29/58
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The compositions of hydrogel colloidal crystals are made from mixing an aqueous suspension of poly-N-isopropylacrylamide (“PNIPAM”)-co-allylamine microgels with dichloromethane, forming a PNIPAM-co-allylamine/dichloromethane mixture. The PNIPAM-co-allylamine/dichloromethane mixture is incubated for a period of time at a given temperature, forming the colloidal crystal material. The colloidal crystals can be stabilized by diffusing a glutaric dialdehyde solution into the colloidal crystal material. The concentration of polymer matrix microgels can determine the orientation of random or columnar crystals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.