Exogels: A Solvent‐Exchange Strategy to Regulate Noncovalent Interactions for Strong and Antiswelling Hydrogels (Adv. Mater. 52/2020)

Xu, Liju; Gao, Shan; Guo, Qirui; Wang, Chen; Qiao, Yan; Qiu, Dong

doi:10.1002/adma.202070395

Cited by 83 publications

(131 citation statements)

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“…This may be attributed to that DMSO, as a strong hydrogen bond receptor, has stronger interactions with polymer chains and solvents in OHE than H 2 O does in the pristine hydrogel and HE. [ 26 ] As a control, the single‐network PAAm electrolyte containing 5M KOH reveals a much weaker tensile stress (19.9 kPa) than OHE and HE (Figure S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Flexible Zinc–Air Battery with High Energy Efficiency and Freezing Tolerance Enabled by DMSO‐Based Organohydrogel Electrolyte

Jiang

Wang

et al. 2021

Small Methods

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With the emergence of various flexible electronics, the flexible zinc–air battery (ZAB) is considered a promising energy source with low cost, high energy density, and safety. However, gel electrolytes that improve the freezing tolerance and energy efficiency of ZABs are rarely explored. Herein, an organohydrogel electrolyte (OHE) is fabricated by soaking poly(2‐acrylamido‐2‐methylpropanesulfonic acid)/polyacrylamide (PAMPS/PAAm) double‐network hydrogel in aqueous KOH electrolyte with dimethyl sulfoxide (DMSO) additive. The prepared OHE exhibits high mechanical strength and excellent ionic conductivity. In addition, the introduction of DMSO effectively improves freezing tolerance and electrochemical performance especially in energy efficiency of ZABs due to that DMSO can break the hydrogen bonds between water molecules and alter the path of the conventional oxygen evolution reaction in ZAB simultaneously. Compared with the control hydrogel electrolyte, the optimized OHE enables flexible ZABs to not only exhibit an exceptionally low charge voltage of 1.63 V, high energy efficiency of 74.2%, and long cycling life of 177 cycles, but also to operate with an excellent specific capacity of 562 mAh g−1 and energy density of 523.4 Wh kg−1 at −40 °C. Moreover, the obtained flexible ZABs keep a stable output under deformations and extreme low temperature, manifesting a great potential for functional wearable devices.

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Section: Resultsmentioning

confidence: 99%

Flexible Zinc–Air Battery with High Energy Efficiency and Freezing Tolerance Enabled by DMSO‐Based Organohydrogel Electrolyte

Jiang

Wang

et al. 2021

Small Methods

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“…Specifically, since water molecules on the interface may impede their intimate contact, adhesion of electronic device with human skin, in wet environment, has long been a challenge in the wearable sensing territory. [ 24,25 ] Hence, various design strategies based on materials [ 26,27 ] and structures [ 28–30 ] have been employed to enhance adhesion on the wet surface. For example, a dry double‐sided tissue adhesive based on dry crosslinking mechanism was developed, with strong adhesion (with a tensile strength of >120 kPa, a shear strength of >120 kPa, and an interfacial toughness of >710 J m −2 ) between two wet porcine skins.…”

Section: Introductionmentioning

confidence: 99%

Environmentally Compatible Wearable Electronics Based on Ionically Conductive Organohydrogels for Health Monitoring with Thermal Compatibility, Anti‐Dehydration, and Underwater Adhesion

Niu

Liu

et al. 2021

Small

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Hydrogel‐based electronics have found widespread applications in soft sensing and health monitoring because of their remarkable biocompatibility and mechanical features similar to human skin. However, they are subjected to potential challenges like structural failure, functional degradation, and device delamination in practical applications, especially facing extreme environmental conditions (e.g., abnormal temperature and humidity). To address these, ionically conductive organohydrogel‐based soft electronics are developed, which can perform at subzero and elevated temperatures (thermal compatibility) as well as at dehydrated and hydrated environments (hydration compatibility) for extended applications. More specifically, gelatin/poly(acrylic acid–N‐hydrosuccinimide ester) (PAA–NHS ester)‐based ionic‐conductive organohydrogel is synthesized. By introducing a glycerol–water binary solvent system, the gel can maintain mechanical softness in a wide temperature range (from −80 to 60 °C). Besides, excellent conductivity is achieved under various conditions by soaking the gel into lithium chloride anhydrous (LiCl) solution. Strong adhesion with skin, even under water, can be realized by covalent bonds between NHS ester from gel and amino groups from human skin. The excellent performances of LiCl‐loaded PAA‐based organohydrogel (L‐PAA‐OH)‐based electronics are further demonstrated under freezing and high temperatures as well as underwater conditions, unveiling their promising prospects in wearable health monitoring in various conditions.

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“…Also, a decline in the crystal size from 2.00 to 1.59 nm was calculated from the Scherer formula. The increment in crystallinity and decline in crystal size always led to better mechanics 75,76 . Lastly, oscillatory dynamic mechanical experiments were performed.…”

Section: Resultsmentioning

confidence: 99%

Facile fabrication of tough and biocompatible hydrogels from polyvinyl alcohol and agarose

Sun

Zhao

et al. 2021

J of Applied Polymer Sci

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A polyvinyl alcohol (PVA)‐agarose (agar) composite hydrogel (M‐PVA‐agar‐60) was developed by simple three cycles of freeze‐thawing, followed by successively soaking in ammonium sulfate aqueous solution to induce phase separation and dialyzing against deionized water to remove residual sulfate salts. Due to the synergy of crystalline regions, hydrogen bonding and phase separation domains, the obtained M‐PVA‐agar‐60 hydrogel exhibits excellent mechanical properties (tensile strength = 1.1 MPa, tensile strain = 324% and compressive stress = 12.5 MPa), combined with a high water content of 87.0%. Moreover, the hydrogel hardly expands after immersing in the phosphate‐buffered saline aqueous solution at 37°C for a week, and the tensile stress and toughness remain almost the same as their initial values, superior to most reported non‐swellable hydrogels. Because of the biocompatible starting materials, absence of toxic chemicals, and dialysis in advance to remove ammonium sulfate, the hydrogel also shows excellent cell compatibility, making it an ideal candidate for tissue engineering materials.

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Exogels: A Solvent‐Exchange Strategy to Regulate Noncovalent Interactions for Strong and Antiswelling Hydrogels (Adv. Mater. 52/2020)

Cited by 83 publications

References 0 publications

Flexible Zinc–Air Battery with High Energy Efficiency and Freezing Tolerance Enabled by DMSO‐Based Organohydrogel Electrolyte

Flexible Zinc–Air Battery with High Energy Efficiency and Freezing Tolerance Enabled by DMSO‐Based Organohydrogel Electrolyte

Environmentally Compatible Wearable Electronics Based on Ionically Conductive Organohydrogels for Health Monitoring with Thermal Compatibility, Anti‐Dehydration, and Underwater Adhesion

Facile fabrication of tough and biocompatible hydrogels from polyvinyl alcohol and agarose

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