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- W2891189557 abstract "Independent control over phase separation and photo-cross-linking allows the structure and porosity of hydrogels to be patterned in a single photolithographic step. This observation is based upon a temperature-triggered spinodal decomposition of a ternary mixture of water, salt, and polymer into a salt-rich aqueous phase and a polymer-rich phase. Importantly, subsequent exposure to light arrests the phase separation, allowing the porosity state to be frozen in a cross-linked hydrogel network. Tuning the delay between the application of heat and illumination allows the pore size to be tuned between 400 nm and 4 μm. By utilizing gray-scale photomasks, a single process can be used to define regions of pure hydrogel, porous hydrogel with a programmed average pore size, and blank substrate with no hydrogel. In addition to representing a combination of top-down and bottom-up processes that enables the realization of complex samples, the simplicity of this process and the versatility of the resultant patterns could provide a useful capability for the definition of hydrogel samples for the development of advanced biomaterials." @default.
- W2891189557 created "2018-09-27" @default.
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- W2891189557 date "2018-09-12" @default.
- W2891189557 modified "2023-10-12" @default.
- W2891189557 title "Patterning Porosity in Hydrogels by Arresting Phase Separation" @default.
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- W2891189557 doi "https://doi.org/10.1021/acsami.8b11530" @default.
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