Abstract
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 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.
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This work was supported by a grant from the NIH R01 CA133697, NIH fellowship to T.M.G.-A. (CA133697).
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Russell, M.M., Raboin, L., Guardado-Alvarez, T.M. et al. Trapping and release of cargo molecules from a micro-stamped mesoporous thin film controlled by poly(NIPAAm-co-AAm). J Sol-Gel Sci Technol 70, 278–285 (2014). https://doi.org/10.1007/s10971-013-3199-y
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DOI: https://doi.org/10.1007/s10971-013-3199-y