Functional hydrogel coatings

National Science Review, Journal Year: 2020, Volume and Issue: 8(2)

Published: Sept. 29, 2020

Hydrogels-natural or synthetic polymer networks that swell in water-can be made mechanically, chemically and electrically compatible with living tissues. There has been intense research development of hydrogels for medical applications since the invention hydrogel contact lenses 1960. More recently, functional coatings controlled thickness tough adhesion have achieved on various substrates. Hydrogel-coated substrates combine advantages hydrogels, such as lubricity, biocompatibility anti-biofouling properties, substrates, stiffness, toughness strength. In this review, we focus three aspects coatings: (i) functions enabled by coatings, (ii) methods coating different adhesion, (iii) tests to evaluate between Conclusions outlook are given at end review.

Language: Английский

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Multifunctional Ionic Skin with Sensing, UV‐Filtering, Water‐Retaining, and Anti‐Freezing Capabilities

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(21)

Published: March 21, 2021

Abstract Conductive polymer hydrogels are receiving considerable attention in applications such as soft robots and human‐machine interfaces. Herein, a transparent highly ionically conductive hydrogel that integrates sensing, UV‐filtering, water‐retaining, anti‐freezing performances is achieved by the organic combination of tannic acid‐coated hydroxyapatite nanowires (TA@HAP NWs), polyvinyl alcohol (PVA) chains, ethylene glycol (EG), metal ions. The ionic conductivity enables tensile strain, pressure, temperature sensing capabilities. In particular, terms strain sensors based on conduction, it has high sensitivity (GF = 2.84) within wide range (350%), linearity ( R 2 0.99003), fast response (≈50 ms) excellent cycle stability. addition, incorporated TA@HAP NWs act nano‐reinforced filler to improve mechanical properties confer UV‐shielding ability upon due its size effect characteristics absorbing ultraviolet light waves, which can reflect absorb short rays transmit visible light. Meanwhile, owing water‐locking between EG water molecules, exhibits freezing resistance at low temperatures moisture retention temperatures. This biocompatible multifunctional provides new ideas for design novel skin devices.

Language: Английский

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An Anti‐Swellable Hydrogel Strain Sensor for Underwater Motion Detection

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 32(13)

Published: Dec. 7, 2021

Abstract Hydrogel‐based wearable electronic devices have received increasing attention. However, the construction of underwater strain sensors remains a significant challenge because swelling hydrogels in an aquatic environment. This work presents fabrication anti‐swellable hydrogel composed polyvinyl alcohol (PVA), copolymer [2‐(methacryloyloxy) ethyl]dimethyl‐(3‐sulfopropyl) ammonium hydroxide (SBMA) and 2‐hydroxyethyl methacrylate. Interestingly, facile switch SBMA moiety from neutral to positively charged status at low pH value leads reduced osmotic pressure for electrostatic repulsion‐driven elimination water molecules anti‐swelling. The resulting exhibits high toughness (518 kJ m −3 ) compressive modulus (8.12 Mpa), ionic conductivity (up 4.58 S −1 ), anti‐swelling behavior (equilibrium ratio 9% 30 days). An sensor based on this is further developed monitor movements sports. High sensitivity achieved identify multidirectional motions, including raising head, swinging arm, bending elbow, knee finger. Therefore, study offers strategy generate hydrogel‐based that can be adopted environment as well expands potential applications devices.

Language: Английский

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3D-printed multifunctional materials enabled by artificial-intelligence-assisted fabrication technologies

Nature Reviews Materials, Journal Year: 2020, Volume and Issue: 6(1), P. 27 - 47

Published: Oct. 12, 2020

Language: Английский

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Polydopamine nanoparticle-dotted food gum hydrogel with excellent antibacterial activity and rapid shape adaptability for accelerated bacteria-infected wound healing

Bioactive Materials, Journal Year: 2021, Volume and Issue: 6(9), P. 2647 - 2657

Published: Feb. 15, 2021

Most commonly used wound dressings have severe problems, such as an inability to adapt shape or a lack of antibacterial capacity, affecting their ability meet the requirements clinical applications. Here, nanocomposite hydrogel (XKP) is developed by introducing polydopamine nanoparticles (PDA NPs) into food gum matrix (XK, consisting xanthan and konjac glucomannan, both FDA-approved thickening agents) for skin healing. In this system, embedded PDA NPs not only interact with form excellent mechanical strength, but also act photothermal transduction agents convert near-infrared laser radiation heat, thereby triggering bacterial death. Moreover, XKP has high elasticity tunable water content, enabling it insulate it, providing moist environment suitable In-vivo healing results clearly demonstrate that can significantly accelerate wounds reducing inflammatory response promoting vascular reconstruction. summary, strategy provides simple practical method overcome drawbacks traditional dressings, further options when choosing materials

Language: Английский

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Bio‐Inspired Stretchable, Adhesive, and Conductive Structural Color Film for Visually Flexible Electronics

Advanced Functional Materials, Journal Year: 2020, Volume and Issue: 30(32)

Published: June 21, 2020

Abstract The rapid progress in flexible electronic devices has attracted immense interest many applications, such as health monitoring devices, sensory skins, and implantable apparatus. Here, inspired by the adhesion features of mussels color shift mechanism chameleons, a novel stretchable, adhesive, conductive structural film is presented for visually electronics. generated adding carbon nanotubes polydopamine (PDA) filler into an elastic polyurethane (PU) inverse opal scaffold. Owing to brilliant flexibility structure PU layer, shows stable stretchability color. Besides, catechol groups on PDA impart with high tissue adhesiveness self‐healing capability. Notably, because its responsiveness, resultant endowed color‐changing ability that responds motions, which can function dual‐signal soft human‐motion sensors real‐time color‐sensing electrical signal monitoring. These make bio‐inspired hydrogel‐based electronics highly potential field.

Language: Английский

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Hydrogel Paint

Advanced Materials, Journal Year: 2019, Volume and Issue: 31(39)

Published: Aug. 4, 2019

For a hydrogel coating on substrate to be stable, covalent bonds polymerize monomer units into polymer chains, crosslink the chains network, and interlink network substrate. The three processes-polymerization, crosslinking, interlinking-usually concur. This concurrency hinders widespread applications of coatings. Here principle is described create paints that decouple polymerization from crosslinking interlinking. Like common paint, paint divides labor between maker user. formulates by copolymerizing coupling agents but does not them. user applies various materials (elastomer, plastic, glass, ceramic, or metal), operations (brush, cast, dip, spin, spray). During cure, As an example, hydrogels with thickness in range 2-20 µm are dip coated medical nitinol wires. wires reduce friction eightfold, remain stable over 50 test cycles. Also demonstrated several proof-of-concept applications, including stimuli-responsive structures antifouling model boats.

Language: Английский

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Naturally sourced hydrogels: emerging fundamental materials for next-generation healthcare sensing

Chemical Society Reviews, Journal Year: 2023, Volume and Issue: 52(9), P. 2992 - 3034

Published: Jan. 1, 2023

The flourishing development of flexible healthcare sensing systems is inseparable from the fundamental materials with application-oriented mechanical and electrical properties. Thanks to continuous inspiration our Mother Nature, hydrogels originating natural biomass are attracting growing attention for their structural functional designs owing unique chemical, physical biological These highly efficient architectural enable them be most promising candidates electronic devices. This comprehensive review focuses on recent advances in naturally sourced constructing multi-functional sensors applications thereof. We first briefly introduce representative polymers, including polysaccharides, proteins, polypeptides, summarize physicochemical design principles fabrication strategies hydrogel based these polymers outlined after material properties required presented. then highlight various techniques devices, illustrate examples wearable or implantable bioelectronics pressure, strain, temperature, biomarker field systems. Finally, concluding remarks challenges prospects hydrogel-based provided. hope that this will provide valuable information next-generation build a bridge between as matter an applied target accelerate new near future.

Language: Английский

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Specialty Tough Hydrogels and Their Biomedical Applications

Advanced Healthcare Materials, Journal Year: 2019, Volume and Issue: 9(2)

Published: Dec. 17, 2019

Hydrogels have long been explored as attractive materials for biomedical applications given their outstanding biocompatibility, high water content, and versatile fabrication platforms into with different physiochemical properties geometries. Nonetheless, conventional hydrogels suffer from weak mechanical properties, restricting use in persistent load-bearing often required of used medical settings. Thus, the mechanically robust that can prolong lifetime clinically suitable under uncompromising vivo conditions is great interest. This review focuses on design considerations strategies to construct such tough hydrogels. Several promising advances proposed specialty soft actuators, drug delivery vehicles, adhesives, coatings, tissue engineering settings are highlighted. While challenges remain before these will be deemed translationally acceptable clinical applications, preliminary results undoubtedly spur hope potential impact this embryonic research field community.

Language: Английский

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Ultrafast gelling using sulfonated lignin-Fe3+ chelates to produce dynamic crosslinked hydrogel/coating with charming stretchable, conductive, self-healing, and ultraviolet-blocking properties

Chemical Engineering Journal, Journal Year: 2020, Volume and Issue: 396, P. 125341 - 125341

Published: May 6, 2020

Language: Английский

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