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2014
Serpe, Michael J., Xu, Wenwen, Gao, Yongfeng
Poly (N-isopropylacrylamide-co-acrylic acid) (pNIPAm-co-AAc) microgel-based free-standing etalons have been developed by fabricating etalons on a solid support that has been coated with a sacrificial polymer layer. Therefore, the etalon could be easily removed from the solid substrate upon...
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2014-01-01
Gao, Yongfeng, Serpe, Michael J.
Poly(N-isopropylacrylamide) (pNIPAm) microgel-based etalons were used to fabricate systems that change visual color in response to light exposure. These systems were fabricated by adding pH responsive microgel-based etalons to a solution composed of the photoacid o-nitrobenzaldehyde (o-NBA). Upon...
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Reductant responsive poly (N-isopropylacrylamide) microgels and microgel-based optical materials
Download2015-01-01
Li, Xue, Gao, Yongfeng, Serpe, Michael J.
Poly(N-isopropylacrylamide) based hydrogel particles (microgels) crosslinked with N,N′-bis(acryloyl)cystamine were prepared using free-radical precipitation polymerization. By coating a single layer of microgels on a gold-coated glass substrate followed by the addition of another gold layer, an...
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2017-01-01
Gao, Yongfeng, Wei, Menglian, Li, Xue, Xu, Wenwen, Ahiabu, Andrews, Perdiz, Juliana, Liu, Zining, Serpe, Michael J.
Stimuli-responsive polymers are capable of changing their chemical and/or physical properties in response to environmental stimuli. This unique feature has allowed stimuli-responsive polymers to be used in a variety of applications. In this review, we present a basic introduction to the theories...
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Electrically Triggered Small Molecule Release from Poly (N-Isopropylacrylamide-co-Acrylic Acid) Microgel-Modified Electrodes
Download2018-01-01
Xu, Wenwen, Zhang, Y., Gao, Yongfeng, Serpe, Michael J.
A monolithic layer of poly(N-isopropylacrylamide-co-acrylic acid) microgels was deposited on an Au electrode and used for electrically triggered release of the small molecule crystal violet (CV), which was used as a model drug. CV was loaded into the surface-bound microgels by exposing them to a...
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2016
Li, Xue, Serpe, Michael J., Gao, Yongfeng
Poly (N-isopropylacrylamide) (pNIPAm)-based hydrogels and hydrogel particles (microgels) have been extensively studied since their discovery a number of decades ago. While their utility seems to have no limit, this feature article is focused on their development and application for sensing small...
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Controlled drug release from the aggregation–disaggregation behavior of pH-responsive microgels
Download2014-01-01
Gao, Yongfeng, Ahiabu, Andrews, Serpe, Michael J.
In this submission, two independent sets of microgels were synthesized that exhibit pH responsivity over different solution pH ranges. The microgels were synthesized by copolymerizing two different comonomers with poly(N-isopropylacrylamide) (pNIPAm). The microgels copolymerized with acrylic acid...
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2015-01-01
Li, Xue, Gao, Yongfeng, Serpe, Michael J.
Poly (N‐isopropylacrylamide) (pNIPAm)‐based hydrogels and hydrogel particles (microgels) have been extensively studied since their discovery and “popularization” a few decades ago. While their uses seem to have no bounds, this Feature Article is focused on their development and application for...
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2017-01-01
Li, Xue, Cai, Xiangbin, Gao, Yongfeng, Serpe, Michael J.
Temperature and pH responsive semi-interpenetrating network (semi-IPN) hydrogel-based bilayer actuators were fabricated by generating a poly(N-isopropylacrylamide) (pNIPAm)-based hydrogel in the presence of positively charged polyelectrolyte poly(diallyldimethylammonium chloride) (pDADMAC) on a...
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2015
Serpe, Michael J., Gao, Yongfeng, Zhang, Qiang M., Ahiabu, Andrews
A series of pyridine-functionalized poly (N-isopropylacrylamide)- based microgels were synthesized. Subsequently, a structured photonic device was fabricated by sandwiching the microgels between two thin Au layers, and their response to CO2 investigated. We show that devices show an optical...