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  • 1
    Online Resource
    Online Resource
    A Superstrong and Reversible Ionic Crystal‐Based Adhesive Inspired by Ice Adhesion
    Wiley ; 2021
    In:  Angewandte Chemie Vol. 133, No. 16 ( 2021-04-12), p. 9030-9041
    Details
    In: Angewandte Chemie, Wiley, Vol. 133, No. 16 ( 2021-04-12), p. 9030-9041
    Abstract: In this study, we developed a superstrong and reversible adhesive, which can possess a high bonding strength in the “adhesive” state and detach with the application of heating. An ionic crystal (IC) gel, in which an IC was immobilized within a soft‐polymer matrix, were synthesized via in situ photo‐crosslinking of a precursor solution composed of N, N‐dimethyl acrylamide (DMAA) and a melted IC. The obtained IC gel is homogenous and transparent at melt point. When cooled to the phase transition temperature of the IC, the gel turns into the adhesive with the adhesion strength of 5.82 MPa (on glasses), due to the excellent wetting of melted gel and a thin layer of crystalline IC with high cohesive strength formed on the substrates. The synergistic effects between IC, polymer networks and substrates were investigated by solid state 1 H NMR and molecular dynamics simulation. Such an adhesive layer is reversable and can be detached by heating and subsequent re‐adhesion via cooling. This study proposed the new design of removable adhesives, which can be used in dynamic and complex environments.
    Type of Medium: Online Resource
    ISSN: 0044-8249 , 1521-3757
    URL: Issue
    URL: Article
    DOI: 10.1002/ange.v133.16
    DOI: 10.1002/ange.202100984
    RVK:
    VA 2100
    RVK:
    VN 5020
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 505868-5
    detail.hit.zdb_id: 506609-8
    detail.hit.zdb_id: 514305-6
    detail.hit.zdb_id: 505872-7
    detail.hit.zdb_id: 1479266-7
    detail.hit.zdb_id: 505867-3
    detail.hit.zdb_id: 506259-7
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  • 2
    Online Resource
    Online Resource
    Moisture‐Wicking, Breathable, and Intrinsically Antibacterial Electronic Skin Based on Dual‐Gradient Poly(ionic liquid) Nanofiber Membranes
    Wiley ; 2022
    In:  Advanced Materials Vol. 34, No. 4 ( 2022-01)
    Details
    In: Advanced Materials, Wiley, Vol. 34, No. 4 ( 2022-01)
    Abstract: Electronic skin can detect minute electrical potential changes in the human skin and represent the body's state, which is critical for medical diagnostics and human–computer interface development. On the other hand, sweat has a significant effect on the signal stability, comfort, and safety of electronic skin in a real‐world application. In this study, by modifying the cation and anion of a poly(ionic liquid) (PIL) and employing a spinning process, a PIL‐based multilayer nanofiber membrane (PIL membrane) electronic skin with a dual gradient is created. The PIL electronic skin is moisture‐wicking and breathable due to the hydrophilicity and pore size‐gradients. The intrinsically antimicrobial activities of PILs allow the safe collection of bioelectrical signals from the human body, such as electrocardiography (ECG) and electromyography (EMG). In addition, a robotic hand may be operated in real‐time, and a preliminary human–computer interface can be accomplished by simple processing of the collected EMG signal. This study establishes a novel practical approach for monitoring and using bioelectrical signals in real‐world circumstances via the multifunctional electronic skin.
    Type of Medium: Online Resource
    ISSN: 0935-9648 , 1521-4095
    URL: Issue
    URL: Article
    DOI: 10.1002/adma.v34.4
    DOI: 10.1002/adma.202106570
    RVK:
    UA 1538
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 1474949-X
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  • 3
    Online Resource
    Online Resource
    Recyclable, Healable, and Tough Ionogels Insensitive to Crack Propagation
    Wiley ; 2022
    In:  Advanced Materials Vol. 34, No. 28 ( 2022-07)
    Details
    In: Advanced Materials, Wiley, Vol. 34, No. 28 ( 2022-07)
    Abstract: Most gels and elastomers introduce sacrificial bonds in the covalent network to dissipate energy. However, long‐term cyclic loading caused irreversible fatigue damage and crack propagation cannot be prevented. Furthermore, because of the irreversible covalent crosslinked networks, it is a huge challenge to implement reversible mechanical interlocking and reorganize the polymer segments to realize the recycling and reuse of ionogels. Here, covalent crosslinking of host materials is replaced with entanglement. The entangled microdomains are used as physical crosslinking while introducing reversible bond interactions. The interpenetrating, entangled, and elastic microdomains of linear segments and covalent‐network microspheres provide mechanical stability, eliminate stress concentration at the crack tip under load, and achieve unprecedented tear and fatigue resistance of ionogels in any load direction. Moreover, reversible entanglements and noncovalent interactions can be disentangled and recombined to achieve recycling and mechanical regeneration, and the recyclability of covalent‐network microdomains is realized.
    Type of Medium: Online Resource
    ISSN: 0935-9648 , 1521-4095
    URL: Issue
    URL: Article
    DOI: 10.1002/adma.v34.28
    DOI: 10.1002/adma.202203049
    RVK:
    UA 1538
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 1474949-X
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  • 4
    Online Resource
    Online Resource
    A Superstrong and Reversible Ionic Crystal‐Based Adhesive Inspired by Ice Adhesion
    Wiley ; 2021
    In:  Angewandte Chemie International Edition Vol. 60, No. 16 ( 2021-04-12), p. 8948-8959
    Details
    In: Angewandte Chemie International Edition, Wiley, Vol. 60, No. 16 ( 2021-04-12), p. 8948-8959
    Abstract: In this study, we developed a superstrong and reversible adhesive, which can possess a high bonding strength in the “adhesive” state and detach with the application of heating. An ionic crystal (IC) gel, in which an IC was immobilized within a soft‐polymer matrix, were synthesized via in situ photo‐crosslinking of a precursor solution composed of N, N‐dimethyl acrylamide (DMAA) and a melted IC. The obtained IC gel is homogenous and transparent at melt point. When cooled to the phase transition temperature of the IC, the gel turns into the adhesive with the adhesion strength of 5.82 MPa (on glasses), due to the excellent wetting of melted gel and a thin layer of crystalline IC with high cohesive strength formed on the substrates. The synergistic effects between IC, polymer networks and substrates were investigated by solid state 1 H NMR and molecular dynamics simulation. Such an adhesive layer is reversable and can be detached by heating and subsequent re‐adhesion via cooling. This study proposed the new design of removable adhesives, which can be used in dynamic and complex environments.
    Type of Medium: Online Resource
    ISSN: 1433-7851 , 1521-3773
    URL: Issue
    URL: Article
    DOI: 10.1002/anie.v60.16
    DOI: 10.1002/anie.202100984
    RVK:
    VA 2100
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2011836-3
    detail.hit.zdb_id: 123227-7
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  • 5
    Online Resource
    Online Resource
    Low‐Hysteresis and High‐Toughness Hydrogels Regulated by Porous Cationic Polymers: the Effect of Counteranions
    Wiley ; 2024
    In:  Angewandte Chemie International Edition Vol. 63, No. 1 ( 2024-01-02)
    Details
    In: Angewandte Chemie International Edition, Wiley, Vol. 63, No. 1 ( 2024-01-02)
    Abstract: Service life and range of polymer materials is heavily reliant on their elasticity and mechanical stability under long‐term loading. Slippage of chain segments under load leads to significant hysteresis of the hydrogels, limiting its repeatability and mechanical stability. Achieving the desired elasticity exceeding that of rubber is a great challenge for hydrogels, particularly when subjected to large deformations. Here, low‐hysteresis and high‐toughness hydrogels were developed through controllable interactions of porous cationic polymers (PCPs) with adjustable counteranions, including reversible bonding of PCP frameworks/polymer segments (polyacrylamide, PAAm) and counteranions/PAAm. This strategy reduces chain segment slippage under load, endowing the PCP‐based hydrogels (PCP‐gels) with good elasticity under large deformations (7 % hysteresis at a strain ratio of 40). Furthermore, due to the enlarged chain segments entanglement by PCP, the PCP‐gels exhibit large strain (13000 %), significantly enhanced toughness (68 MJ m −3 ), high fracture energy (43.1 kJ m −2 ), and fatigue resistance. The unique properties of these elastic PCP‐gels have promising applications in the field of flexible sensors.
    Type of Medium: Online Resource
    ISSN: 1433-7851 , 1521-3773
    URL: Issue
    URL: Article
    DOI: 10.1002/anie.v63.1
    DOI: 10.1002/anie.202316375
    RVK:
    VA 2100
    Language: English
    Publisher: Wiley
    Publication Date: 2024
    detail.hit.zdb_id: 2011836-3
    detail.hit.zdb_id: 123227-7
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  • 6
    Online Resource
    Online Resource
    Ultra‐Tough and Recyclable Ionogels Constructed by Coordinated Supramolecular Solvents
    Wiley ; 2022
    In:  Angewandte Chemie Vol. 134, No. 50 ( 2022-12-12)
    Details
    In: Angewandte Chemie, Wiley, Vol. 134, No. 50 ( 2022-12-12)
    Abstract: The mechanical properties of most hydrogels (ionogels) are considerably affected by covalently cross‐linked networks. However, the interactions between solvent/solvent molecules and solvent/polymer chains are usually ignored. Herein, a series of ultra‐tough ionogels were prepared via a supramolecular solvent, halometallate ionic liquid, in which cations and coordinating anions form a 3D supramolecular network. The linear polymer chains are physically cross‐linked with supramolecular solvents synergistically enhancing the strength (14.3 MPa), toughness (78 MJ m −3 ), and Young's modulus (55 MPa) of ionogels, effectively dispersing the stress concentration under load, and obtaining better fatigue resistance and higher fracture energy (198 kJ m −2 ). Furthermore, the reversible cross‐linking enables green recovery and recycling of ionogels, simply by water. This strategy shows broad applicability based on a variety of supramolecular solvents and coordinatable polymers.
    Type of Medium: Online Resource
    ISSN: 0044-8249 , 1521-3757
    URL: Issue
    URL: Article
    DOI: 10.1002/ange.v134.50
    DOI: 10.1002/ange.202212512
    RVK:
    VA 2100
    RVK:
    VN 5020
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 505868-5
    detail.hit.zdb_id: 506609-8
    detail.hit.zdb_id: 514305-6
    detail.hit.zdb_id: 505872-7
    detail.hit.zdb_id: 1479266-7
    detail.hit.zdb_id: 505867-3
    detail.hit.zdb_id: 506259-7
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  • 7
    Online Resource
    Online Resource
    Tough Hydrogels with Isotropic and Unprecedented Crack Propagation Resistance
    Wiley ; 2022
    In:  Advanced Functional Materials Vol. 32, No. 43 ( 2022-10)
    Details
    In: Advanced Functional Materials, Wiley, Vol. 32, No. 43 ( 2022-10)
    Abstract: Muscles and some tough hydrogels can maintain perfect mechanical properties after millions of loading cycles owing to the anisotropic microstructures inside them. However, applications of intrinsic anisotropic microstructures in biological tissues and tough hydrogels are limited by the poor mechanical performance in the perpendicular direction relative to the alignment direction. Here, a universal strategy is proposed for developing hydrogels with unprecedented isotropic crack propagation resistance only depending on the interpenetrating entanglements of polymer chains (polyacrylamide (PAAM) or poly‐(1‐acrylanmido‐2‐methylpropanesulfonic acid) (PAMPS)) in deformable polymeric microspheres (PAMPS or PAAM). The deformable interpenetrating network in microspheres can transform the hydrogel from isotropic to anisotropic instantaneously in any load direction, and effectively alleviate the stress concentration at the crack tip, dissipate energy, and eliminate notch sensitivity. The best isotropic hydrogel displays an ultimate strain of 5300%, toughness of 18.9 MJ m –3 , fracture energy of 157 kJ m –2 , and fatigue threshold of 4.2 kJ m –2 . Furthermore, the mechanical strength of hydrogels can be simply tuned by solvent replacement. The strategy presented here can be expanded to prepare other isotropic hydrogels with super tear‐resistant and anti‐fatigue properties, based on a wide variety of deformable microspheres and matrix polymers.
    Type of Medium: Online Resource
    ISSN: 1616-301X , 1616-3028
    URL: Issue
    URL: Article
    DOI: 10.1002/adfm.v32.43
    DOI: 10.1002/adfm.202207348
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2029061-5
    detail.hit.zdb_id: 2039420-2
    SSG: 11
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  • 8
    Online Resource
    Online Resource
    Ultra‐Tough and Recyclable Ionogels Constructed by Coordinated Supramolecular Solvents
    Wiley ; 2022
    In:  Angewandte Chemie International Edition Vol. 61, No. 50 ( 2022-12-12)
    Details
    In: Angewandte Chemie International Edition, Wiley, Vol. 61, No. 50 ( 2022-12-12)
    Abstract: The mechanical properties of most hydrogels (ionogels) are considerably affected by covalently cross‐linked networks. However, the interactions between solvent/solvent molecules and solvent/polymer chains are usually ignored. Herein, a series of ultra‐tough ionogels were prepared via a supramolecular solvent, halometallate ionic liquid, in which cations and coordinating anions form a 3D supramolecular network. The linear polymer chains are physically cross‐linked with supramolecular solvents synergistically enhancing the strength (14.3 MPa), toughness (78 MJ m −3 ), and Young's modulus (55 MPa) of ionogels, effectively dispersing the stress concentration under load, and obtaining better fatigue resistance and higher fracture energy (198 kJ m −2 ). Furthermore, the reversible cross‐linking enables green recovery and recycling of ionogels, simply by water. This strategy shows broad applicability based on a variety of supramolecular solvents and coordinatable polymers.
    Type of Medium: Online Resource
    ISSN: 1433-7851 , 1521-3773
    URL: Issue
    URL: Article
    DOI: 10.1002/anie.v61.50
    DOI: 10.1002/anie.202212512
    RVK:
    VA 2100
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2011836-3
    detail.hit.zdb_id: 123227-7
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  • 9
    Online Resource
    Online Resource
    Three-Dimensional Printable, Highly Conductive Ionic Elastomers for High-Sensitivity Iontronics
    American Chemical Society (ACS) ; 2022
    In:  ACS Applied Materials & Interfaces Vol. 14, No. 22 ( 2022-06-08), p. 26068-26076
    Details
    In: ACS Applied Materials & Interfaces, American Chemical Society (ACS), Vol. 14, No. 22 ( 2022-06-08), p. 26068-26076
    Type of Medium: Online Resource
    ISSN: 1944-8244 , 1944-8252
    URL: Article
    DOI: 10.1021/acsami.2c06682
    Language: English
    Publisher: American Chemical Society (ACS)
    Publication Date: 2022
    detail.hit.zdb_id: 2467494-1
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  • 10
    Online Resource
    Online Resource
    Integrated Moist‐Thermoelectric Generator for Efficient Waste Steam Energy Utilization
    Wiley ; 2023
    In:  Advanced Science Vol. 10, No. 22 ( 2023-08)
    Details
    In: Advanced Science, Wiley, Vol. 10, No. 22 ( 2023-08)
    Abstract: Industrial waste steam is one of the major sources of global energy losses. Therefore, the collection and conversion of waste steam energy into electricity have aroused great interest. Here, a “two‐in‐one” strategy is reported that combines thermoelectric and moist‐electric generation mechanisms for a highly efficient flexible moist‐thermoelectric generator (MTEG). The spontaneous adsorption of water molecules and heat in the polyelectrolyte membrane induces the fast dissociation and diffusion of Na + and H + , resulting in the high electricity generation. Thus, the assembled flexible MTEG generates power with a high open‐circuit voltage ( V oc ) of 1.81 V (effective area = 1cm 2 ) and a power density of up to 4.75±0.4 µW cm −2 . With efficient integration, a 12‐unit MTEG can produce a V oc of 15.97 V, which is superior to most known TEGs and MEGs. The integrated and flexible MTEGs reported herein provide new insights for harvesting energy from industrial waste steam.
    Type of Medium: Online Resource
    ISSN: 2198-3844 , 2198-3844
    URL: Issue
    URL: Article
    DOI: 10.1002/advs.v10.22
    DOI: 10.1002/advs.202206071
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2808093-2
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