Ionic liquid mediated sol-gel sorbents
US8623279B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2011 |
| Grant date | Jan 7, 2014 |
| Priority date | — |
| Expiry date | Nov 21, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/567
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Ionic liquid (IL)-mediated sol-gel hybrid organic-inorganic materials present enormous potential for effective use in analytical microextraction. One obstacle to materializing this prospect arises from high viscosity of ILs significantly slowing down sol-gel reactions. A method was developed which provides phosphonium-based, pyridinium-based, and imidazolium-based IL-mediated advanced sol-gel organic-inorganic hybrid materials for capillary microextraction. Scanning electron microscopy results demonstrate that ILs can serve as porogenic agents in sol-gel reactions. IL-mediated sol-gel coatings prepared with silanol-terminated polymers provided up to 28 times higher extractions compared to analogous sol-gel coatings prepared without any IL in the sol solution. This study shows that IL-generated porous morphology alone is not enough to provide effective extraction media: careful choice of the organic polymer and the precursor with close sol-gel reactivity must be made to ensure effective chemical bonding of the organic polymer to the created sol-gel material to be able to provide the desired sorbent characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.