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Skip to Search Results- 3Photonic Materials
- 2Controlled Release
- 2Etalons
- 2Microgel-Based Etalon
- 2N-Isopropylacrylamide
- 2Stimuli Responsive Polymers
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Comparison of the Responsivity of Solution-Suspended and Surface-Bound Poly (N-isopropylacrylamide)-Based Microgels for Sensing Applications
Download2017-01-01
Li, Wenxiang, Hu, Liang, Zhu, Jinghua, Li, Dan, Luan, Yafei, Xu, Wenwen, Serpe, Michael J.
In this submission, the phase transition behavior for poly(N-isopropylacrylamide-co-acrylic acid) (pNIPAm-co-AAc) microgels and their assemblies was investigated as a function of temperature and pH using UV–vis spectroscopy (to probe light scattering behavior) and quartz crystal microbalance with...
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2013-01-01
Gao, Yongfeng, Zago, Gustavo P., Jia, Zhanghu, Serpe, Michael J.
A device composed of a poly (N-isopropylacrylamide)-co-acrylic acid (pNIPAm-co-AAc) microgel layer sandwiched between two thin Au layers (all on a glass support) was used as a novel platform for controlled and triggered small molecule delivery. Tris (4-(dimethylamino)phenyl)methylium chloride...
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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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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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2017-01-01
Xu, Wenwen, Wei, Menglian, Serpe, Michael J.
A facile self‐assembly method is presented to prepare poly(N‐isopropylacrylamide)‐based microgels modified anisotropically with gold nanoparticles (Au NPs) to yield Janus microgels. Transmission electron microscopy is used to confirm that microgels are selectively coated on one or both sides with...
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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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2017-01-01
Carvalho, Wildemar S. P., Wei, Menglian, Ikpo, Nduka, Gao, Yongfeng, Serpe, Michael J.
Reports in the literature on the development of new chemical sensing technologies have been growing steadily in number for years. For example, a Web of Science topic search using the term “Chemical Sensing” revealed that over 8 000 papers were published in 2015–2017, with over 40 000 citations to...
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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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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...