Trapping and release of cargo molecules from a micro-stamped mesoporous thin film controlled by poly(NIPAAm-co-AAm)
| Autor: | Lorraine Raboin, Melissa M. Russell, Jeffrey I. Zink, Tania M. Guardado-Alvarez |
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| Rok vydání: | 2013 |
| Předmět: |
chemistry.chemical_classification
Materials science Nanotechnology General Chemistry Polymer Mesoporous silica Condensed Matter Physics Lower critical solution temperature Evaporation (deposition) Article Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Hydrofluoric acid Chemical engineering chemistry Materials Chemistry Ceramics and Composites Thin film Mesoporous material Sol-gel |
| Zdroj: | Journal of Sol-Gel Science and Technology. 70:278-285 |
| ISSN: | 1573-4846 0928-0707 |
| Popis: | Materials that utilize the micropatterned structure of a mesoporous silica film to successfully load and release cargo using a thermal sensitive polymer are presented in this paper. Films with pore sizes of ~2 nm and ~5 nm aligned in the pulling direction were synthesized using evaporation induced self-assembly techniques. The pores are exposed using a new method of stamping micropatterns without the use hydrofluoric acid. A well studied temperature dependent polymer (poly(N-isopropylacrylamide-co-Acrylamide)) was grafted onto the surface of these films to act as a temperature activated gatekeeper. Below the lower critical solution temperature (LCST) the polymer is erect and can block the pore openings, trapping cargo inside the pores. When the temperature is above the LCST the polymer collapses and unblocks the pores, allowing cargo to escape. The loading capacities as well as the reusability of these films were studied. |
| Databáze: | OpenAIRE |
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