Bioinspired Multifunctional Anti-icing Hydrogel

He, Zhiyuan; Wu, Chenyang; Hua, Mutian; Wu, Shuwang; Wu, Dong; Zhu, Xinyuan; Wang, Jianjun; He, Ximin

doi:10.1016/j.matt.2019.12.017

Cited by 157 publications

(109 citation statements)

References 46 publications

(66 reference statements)

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“…Third, the solvent can be changed from pure water to a mixture of water and organic liquids, such as propylene or ethylene glycol, to form hybrid organo‐hydrogels with much larger working temperature ranges 18‐20 . Fourth, the anti‐freezing property can be realized through nano‐confinement of water molecules 21‐24 . But the anti‐freezing performance by nano‐confinement is not comparable with the first three strategies.…”

Section: Introductionmentioning

confidence: 99%

Rapid and scalable fabrication of ultra‐stretchable, anti‐freezing conductive gels by cononsolvency effect

Alsaid

Yao

et al. 2021

EcoMat

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With the emergence of soft electronic devices, the requirements for conductive soft materials are unprecedentedly high. Among various soft materials, hydrogels are gaining tremendous attention for their superior softness, wetness, responsiveness, and biocompatibility. However, hydrogels inevitably lose elasticity and ionic conductivity at subzero temperature because of water freezing in the polymer matrices, severely limiting applications at low temperatures. Herein, we propose a rapid fabrication strategy to produce anti‐freezing conductive gels with poly(vinyl alcohol) on a large scale within minutes (vs hours/days in conventional methods) using a water/DMSO binary liquid system, which serves as gelation inducer via cononsolvency and anti‐freezing solvents simultaneously. The gel with 60 wt% DMSO shows the best anti‐freezing performance, remaining unfrozen at temperatures lower than −50°C, while also maintaining the highest mechanical properties with a tensile strength of 1.1 MPa, toughness of 10.9 MJ/m3, and elongation of 1500% outperforming the most previous reports. After incorporating H2SO4, the gels exhibit a high ionic conductivity of 5.25 S/m and maintain 1.65 S/m even at −50°C. Furthermore, an all‐in‐one supercapacitor is fabricated to demonstrate the potential of the anti‐freezing gel in soft device applications with good performance at subzero temperatures. A full recyclability of the material was also demonstrated.

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Section: Introductionmentioning

confidence: 99%

Rapid and scalable fabrication of ultra‐stretchable, anti‐freezing conductive gels by cononsolvency effect

Alsaid

Yao

et al. 2021

EcoMat

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“…Therefore, it is much more desirable to design passive anti-icing surfaces via lowering freezing temperature or reducing ice adhesion, with the benefit of reducing energy consumption [8]. Recently, several strategies have been proposed to depress the freezing temperature, such as ion-infused surfaces [14,15], charged surfaces [16], photothermal surfaces [17], etc. Meanwhile, Wang and co-workers found that water molecules can interact tightly with hydrophilic polymers, making the water in the hydrogel coating remain liquid in subzero environments, a quality which can be utilized to reduce the ice adhesion.…”

Section: Introductionmentioning

confidence: 99%

Hydrogels as Durable Anti-Icing Coatings Inhibit and Delay Ice Nucleation

et al. 2020

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The accumulation of ice on surfaces brings dangerous and costly problems to our daily life. Thus, it would be desirable to design anti-icing coatings for various surfaces. We report a durable anti-icing coating based on mussel-inspired chemistry, which is enabled via fabricating a liquid water layer, achieved by modifying solid substrates with the highly water absorbing property of sodium alginate. Dopamine, the main component of the mussel adhesive protein, is introduced to anchor the sodium alginate in order to render the coating applicable to all types of solid surfaces. Simultaneously, it serves as the cross-linking agent for sodium alginate; thus, the cross-linking degree of the coatings could be easily varied. The non-freezable and freezable water in the coatings with different cross-link degrees all remain liquid-like at subzero conditions and synergistically fulfill the aim of decreasing the temperature of ice nucleation. These anti-icing coatings display excellent stability even under harsh conditions. Furthermore, these coatings can be applied to almost all types of solid surfaces and have great promise in practical applications.

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“…The elastic modulus of the hydrogel layer was determined previously to be E ≈ 30 kPa , [ 48 ] value which is two orders of magnitude lower than the pristine Tygon substrate ( E ≈ 6 MPa). The presence of the water‐containing hydrogel layer decreased the coefficient of friction (COF) of the surface, [ 50–53 ] tested here using a rheometer with a steel parallel plate geometry, as described previously. [ 47,48 ] We characterized the COF of both pristine and coated flat surfaces with continuous shearing with a normal force of 1 N up to 60 min, as shown in Figure a.…”

Section: Figurementioning

confidence: 99%

Ultrathin and Robust Hydrogel Coatings on Cardiovascular Medical Devices to Mitigate Thromboembolic and Infectious Complications

Parada

Riley

et al. 2020

Adv Healthcare Materials

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Thromboembolic and infectious complications stemming from the use of cardiovascular medical devices are still common and result in significant morbidity and mortality. There is no strategy to date that effectively addresses both challenges at the same time. Various surface modification strategies (e.g., silver, heparin, and liquid-impregnated surfaces) are proposed yet each has several limitations and shortcomings. Here, it is shown that the incorporation of an ultrathin and mechanically robust hydrogel layer reduces bacterial adhesion to medical-grade tubing by 95%. It is additionally demonstrated, through a combination of in vitro and in vivo tests, that the hydrogel layer significantly reduces the formation and adhesion of blood clots to the tubing without affecting the blood's intrinsic clotting ability. The adhesion of clots to the tubing walls is reduced by over 90% (in vitro model), which results in an ≈60% increase in the device occlusion time (time before closure due to clot formation) in an in vivo porcine model. The advantageous properties of this passive coating make it a promising surface material candidate for medical devices interfacing with blood. Cardiovascular devices such as intravascular (IV) catheters are essential for the diagnosis and treatment of many acute and chronic

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Bioinspired Multifunctional Anti-icing Hydrogel

Cited by 157 publications

References 46 publications

Rapid and scalable fabrication of ultra‐stretchable, anti‐freezing conductive gels by cononsolvency effect

Rapid and scalable fabrication of ultra‐stretchable, anti‐freezing conductive gels by cononsolvency effect

Hydrogels as Durable Anti-Icing Coatings Inhibit and Delay Ice Nucleation

Ultrathin and Robust Hydrogel Coatings on Cardiovascular Medical Devices to Mitigate Thromboembolic and Infectious Complications

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