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- 5Phase-Transition
- 5Photonic Materials
- 5Stimuli-Responsive Polymers
- 3Protein-Concentration
- 2Copolymer Microgels
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2012
Poly (N-isopropylacrylamide) (pNIPAm) is one of the most completely studied “smart” polymers due to its unique reversible thermoresponsivity. That is, when pNIPAm in water is heated > ~31°C, it transits from a random coil to a globule conformation; this transition is reversed when T < ~31°C. This...
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Penetration of polyelectrolytes into charged poly (N-isopropylacrylamide) microgel layers confined between two surfaces
Download2013-01-01
Islam, Molla R., Serpe, Michael J.
pH and temperature sensitive poly(N-isopropylacrylamide) (pNIPAm) microgel-based etalons were fabricated by sandwiching a “monolithic” microgel layer between two semitransparent, 15 nm Au layers. The devices exhibit visual color and multipeak reflectance spectra, both of which primarily depend on...
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2014
Ahiabu, Andrews, Islam, Molla R., Li, Xue, Serpe, Michael J.
Responsive polymer-based materials have found numerous applications due to their ease of synthesis and the variety of stimuli that they can be made responsive to. In this review, we highlight the group’s efforts utilizing thermoresponsive poly (N-isopropylacrylamide) (pNIPAm) microgel-based...
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2014
Serpe, Michael J., Islam, Molla R.
In this submission we fabricated a humidity-responsive polymer-based actuator by layering negatively charged poly(N-isopropylacrylamide)-co-acrylic acid microgels and positively charged poly(diallyldimethyl ammonium chloride) on top of a flexible plastic substrate. We show that the extent of the...
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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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2015
Guo, Siyuan, Zhang, Qiang M., Serpe, Michael J., Wei, Menglian, Gao, Yongfeng
A device constructed by sandwiching a thin film of poly(N-isopropylacrylamide)-co-acrylic acid (pNIPAmco-AAc) microgels between two thin layers of Au (all on a glass support) was used as a novel platform for controlled release of small molecules (drugs). In this submission, the model drug tris...
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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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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
Li, Xue, Serpe, Michael J., Gao, Yongfeng
Responsive polymer-based materials (or smart materials) have found numerous uses over the years due to their ease of synthesis and various responsivities/functionalities. Of them, stimuli-responsive hydrogel particles (microgels) have generated a lot of interest, and have been used for a number...
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2015
Berg, Darren, Mugo, Samuel M., Zhang, Qiang M., Serpe, Michael J.
Lipase-modified pH-responsive poly(N-isopropylacrylamide)-based microgels were synthesized. An optical device was subsequently fabricated by sandwiching the enzyme loaded responsive microgels between two thin Au layers, and their response to triolein, a model triglyceride, was investigated. The...