Abstract
Differential swelling of spatially patterned gel sheets offers an indirect avenue to rational understanding how things in nature grows as time elapses. In the present study, we demonstrate swelling-driven deformation of spatially designed gel sheets sensitively relying on film thickness and pattern dimension. Through chemical copolymerization of poly (N-isopropyl acrylamide) (PNIPAm) with pendent benzophenone UV-crosslinkers, photo-crosslinkable hydrogels were prepared. Various kinds of spatially designed features with different equilibrium degrees of swelling are created by grayscale and halftone gel lithography techniques, wherein time-sequential UV exposures with a number of photo-masks, thus selectively embedding densely-crosslinked features into a lightly-crosslinked area. Deformation of the photo-patterned gel sheets by energy competition between the regions strongly depends on a characteristic dimension and sheet thickness, providing fruitful information on the contrast in modulus between the regions.
This research was supported by the Keimyung University Research Grant of 2016.
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References
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We gratefully acknowledge support the Keimyung University Research Grant of 2016.
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Byun, M. (2017). Grayscale and Halftone Gel Lithography as Promising Techniques for Swelling-Induced Deformation of Smart Polymer Hydrogel Films. In: Park, J., Chen, SC., Raymond Choo, KK. (eds) Advanced Multimedia and Ubiquitous Engineering. FutureTech MUE 2017 2017. Lecture Notes in Electrical Engineering, vol 448. Springer, Singapore. https://doi.org/10.1007/978-981-10-5041-1_21
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DOI: https://doi.org/10.1007/978-981-10-5041-1_21
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