Metal-ion-mediated hydrogels with thermo-responsiveness for smart windows

Abstract The poly(N-isopropylacrylamide-co-N-maleylgelatin) [P(NIPAAm-co-N-MAGEL)] hydrogel was prepared by the free radical polymerization of N-isopropylacrylamide (NIPAAm) and N-maleylgelatin (N-MAGEL) with N,N′-methylene bis(acrylamide) (BIS) as the cross linker in the complete aqueous environment. The hydrogel becomes opaque when the temperature exceeds lower critical solution temperature (LCST) and goes back to its original transparent state when it is cooled below the LCST which can be finely tuned as it shows a linear dependence on the concentration of Na+, Mg2+ and Al3+. Interestingly, different from Na+ and Mg2+, Al3+ could mediate the transparency of the hydrogel even when the temperature is below LCST and induce the formation of double-network (DN) hydrogel. Metal-ion-carboxylate supramolecular interactions are proposed to dominate this property through ionic cross-linking. The hydrogel could be used as the temperature and metal ions controlled smart window. Effects of metal ions on swelling characteristics, mechanical property and microstructures of the hydrogel were further investigated.

[1]  Mei Liu,et al.  Synthesis and characterization of biodegradable thermoresponsive N-maleyl gelatin-co-P(N-isopropylacrylamide) hydrogel cross-linked with Bis-acrylamide for control release , 2015, Colloid and Polymer Science.

[2]  Ivan P. Parkin,et al.  Nano-composite thermochromic thin films and their application in energy-efficient glazing , 2010 .

[3]  Hong Dong,et al.  Cation-induced hydrogels of cellulose nanofibrils with tunable moduli. , 2013, Biomacromolecules.

[4]  Lujie Cao,et al.  Multistimuli-Responsive, Moldable Supramolecular Hydrogels Cross-Linked by Ultrafast Complexation of Metal Ions and Biopolymers. , 2015, Angewandte Chemie.

[5]  Wenxin Wang,et al.  Injectable and Tunable Gelatin Hydrogels Enhance Stem Cell Retention and Improve Cutaneous Wound Healing , 2017 .

[6]  Zhigang Suo,et al.  Strengthening alginate/polyacrylamide hydrogels using various multivalent cations. , 2013, ACS applied materials & interfaces.

[7]  Dujing Wang,et al.  Mechanical properties of PNIPAM based hydrogels: A review. , 2017, Materials science & engineering. C, Materials for biological applications.

[8]  M. Zrínyi,et al.  Electrically adjustable thermotropic windows based on polymer gels , 2003 .

[9]  R. Yoshida,et al.  Reversible conformational changes in the parallel type G-quadruplex structure inside a thermoresponsive hydrogel. , 2017, Chemical communications.

[10]  Feng Yan,et al.  Thermo- and electro-dual responsive poly(ionic liquid) electrolyte based smart windows. , 2017, Chemical communications.

[11]  Bruce P. Lee,et al.  Effect of metal ion type on the movement of hydrogel actuator based on catechol-metal ion coordination chemistry , 2016 .

[12]  Xiao Hu,et al.  Temperature-responsive hydrogel with ultra-large solar modulation and high luminous transmission for “smart window” applications , 2014 .

[13]  A. Rogach,et al.  Hydrogel-Based Materials for Delivery of Herbal Medicines. , 2017, ACS applied materials & interfaces.

[14]  Lihong Zhao,et al.  Graphene Oxide/Polyacrylamide/Aluminum Ion Cross-Linked Carboxymethyl Hemicellulose Nanocomposite Hydrogels with Very Tough and Elastic Properties. , 2016, Chemistry, an Asian journal.

[15]  Di Zhang,et al.  Carbon nitride nanosheets as visible light photocatalytic initiators and crosslinkers for hydrogels with thermoresponsive turbidity , 2017 .

[16]  Jun Yang,et al.  Metal Ion Mediated Cellulose Nanofibrils Transient Network in Covalently Cross-linked Hydrogels: Mechanistic Insight into Morphology and Dynamics. , 2017, Biomacromolecules.

[17]  Yufeng Cai,et al.  A Dual-Responsive Nanocomposite toward Climate-Adaptable Solar Modulation for Energy-Saving Smart Windows. , 2017, ACS applied materials & interfaces.

[18]  Marc Behl,et al.  Shape-Memory Hydrogels: Evolution of Structural Principles To Enable Shape Switching of Hydrophilic Polymer Networks. , 2017, Accounts of chemical research.

[19]  Jian Ping Gong,et al.  Why are double network hydrogels so tough , 2010 .

[20]  Erhan Pişkin,et al.  Functional copolymers of N-isopropylacrylamide for bioengineering applications , 2007 .

[21]  P. Ma,et al.  Ionically crosslinked alginate hydrogels as scaffolds for tissue engineering: part 1. Structure, gelation rate and mechanical properties. , 2001, Biomaterials.

[22]  Jean-François Lutz,et al.  Point by point comparison of two thermosensitive polymers exhibiting a similar LCST: is the age of poly(NIPAM) over? , 2006, Journal of the American Chemical Society.

[23]  Martin Kröger,et al.  Poly(N-isopropylacrylamide) Phase Diagrams: Fifty Years of Research. , 2015, Angewandte Chemie.

[24]  P. Cremer,et al.  Specific ion effects on the water solubility of macromolecules: PNIPAM and the Hofmeister series. , 2005, Journal of the American Chemical Society.

[25]  M. Zrínyi,et al.  Thermotropic Polymer Gels: Smart Gel Glass , 2005 .

[26]  Teruo Okano,et al.  Temperature dependence of swelling of crosslinked poly(N,N′-alkyl substituted acrylamides) in water , 1990 .

[27]  John R. Clegg,et al.  Analyte-Responsive Hydrogels: Intelligent Materials for Biosensing and Drug Delivery. , 2017, Accounts of chemical research.

[28]  Aiqin Wang,et al.  Ag nanoparticle-entrapped hydrogel as promising material for catalytic reduction of organic dyes , 2012 .

[29]  Xuhong Guo,et al.  Binary Solvent Colloids of Thermosensitive Poly(N-isopropylacrylamide) Microgel for Smart Windows , 2014 .

[30]  F. Winnik.  Fluorescence studies of aqueous solutions of poly(N-isopropylacrylamide) below and above their LCST , 1990 .

[31]  Hun-Kuk Park,et al.  Snapshot of phase transition in thermoresponsive hydrogel PNIPAM: Role in drug delivery and tissue engineering , 2016, Macromolecular Research.

[32]  Wei Wang,et al.  Nano-structured smart hydrogels with rapid response and high elasticity , 2013, Nature Communications.