Poly(N-isopropylacrylamide)-based smart hydrogels: Design, properties and applications

Tang, Lin; Wang, Ling; Yang, Xiao; Feng, Yiyu; Yu, Li; Feng, Wei

doi:10.1016/j.pmatsci.2020.100702

Cited by 543 publications

(328 citation statements)

References 382 publications

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“…[4][5][6] The most studied energy-saving windows are focused on chromogenic technologies, including electrochromic, photochromic, and thermochromic. [7][8][9][10][11] Examples of chromogenic materials includes hydrogels 12 and liquid crystals. [13][14][15] Among three, thermochromic materials are considered as the most cost-effective, rational stimulus and zero energy input properties.…”

Section: Introductionmentioning

confidence: 99%

Liquid Thermo-Responsive Smart Window Derived from Hydrogel

Zhou

Wang

Peng

et al. 2020

Joule

290

162

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Section: Introductionmentioning

confidence: 99%

Liquid Thermo-Responsive Smart Window Derived from Hydrogel

Zhou

Wang

Peng

et al. 2020

Joule

290

162

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“…Nano- and microgels are crosslinked gel-particles with colloidal dimensions that emerged as a research field in polymer sciences in recent decades [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. Their increasing popularity can be attributed to their responsiveness towards external stimuli such as temperature or pH, which is achieved by polymerizing certain monomers such as acrylamides and weak acids or bases [ 9 , 10 , 11 , 12 , 13 , 14 ] and due to their tunability in size [ 15 ] and architecture [ 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Importance of pH in Synthesis of pH-Responsive Cationic Nano- and Microgels

2021

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While cationic microgels are potentially useful for the transfection or transformation of cells, their synthesis has certain drawbacks regarding size, polydispersity, yield, and incorporation of the cationic comonomers. In this work, a range of poly(N-isopropylacrylamide) (PNIPAM) microgels with different amounts of the primary amine N-(3-aminopropyl)methacrylamide hydrochloride (APMH) as the cationic comonomer were synthesized. Moreover, the pH-value during reaction was varied for the synthesis of microgels with 10 mol% APMH-feed. The microgels were analyzed by means of their size, thermoresponsive swelling behavior, synthesis yield, polydispersity and APMH-incorporation. The copolymerization of APMH leads to a strong decrease in size and yield of the microgels, while less than one third of the nominal APMH monomer feed is incorporated into the microgels. With an increase of the reaction pH up to 9,5 , the negative effects of APMH copolymerization were significantly reduced. Above this pH, synthesis was not feasible due to aggregation. The results show that the reaction pH has a strong influence on the synthesis of pH-responsive cationic microgels and therefore it can be used to tailor the microgel properties.

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“…At present, some simple methods have been proposed to prepare high‐performance hydrogels with multiple responses 11‐14 . Poly( N ‐isopropylacrylamide) (PNIPAM) is a unique temperature‐responsive hydrogel, the typical temperature‐sensitive hydrogel has been extensively studied for its reversible temperature response 15‐18 . The temperature response property contrary to the normal phenomenon makes the intelligent hydrogel have great application potential.…”

Section: Introductionmentioning

confidence: 99%

Preparation of multifunctional hydrogels with pore channels using agarose sacrificial templates and its applications

Mao

Wang

2021

Polymers for Advanced Techs

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Smart hydrogel has been widely studied due to their unique response characteristics. Although many smart hydrogels have been developed, the preparation of high‐performance and multi‐responsive smart hydrogels remains a challenge. The application of developing new materials is also the valuable embodiment of materials, such as temperature sensors, thermal switches and anionic dye adsorption. In this study, poly(N‐isopropylacrylamide) (PNIPAM) hydrogel with pore channels was prepared using agarose as a sacrificial template, and a polyaniline network structure was introduced into hydrogel pore channels to endow the hydrogels with stable conductivity. This point can be confirmed by the Fourier transform infrared spectroscopy and scanning electron microscopy images of hydrogels. The decomposition temperature of hydrogels characterized by thermogravimetric analysis. Thermal response analysis and electrical performance testing found that PNIPAM hydrogel with pore channels exhibited enhanced temperature‐responsive swelling‐shrinkage properties and high conductivity (1.83 S m−1). Based on this unique property, we demonstrated the application of materials in thermal switching (response temperature ~33°C) and can be potentially applied to the temperature sensor and anionic dye adsorption.

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Poly(N-isopropylacrylamide)-based smart hydrogels: Design, properties and applications

Cited by 543 publications

References 382 publications

Liquid Thermo-Responsive Smart Window Derived from Hydrogel

Liquid Thermo-Responsive Smart Window Derived from Hydrogel

Importance of pH in Synthesis of pH-Responsive Cationic Nano- and Microgels

Preparation of multifunctional hydrogels with pore channels using agarose sacrificial templates and its applications

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