Hydrogel tapes for fault-tolerant strong wet adhesion

Xue, Bin; Gu, Jie; Li, Lan; Yu, Wenting; Yin, Shenghua; Qin, Meng; Jiang, Qing; Wang, Wei; Cao, Yi

doi:10.1038/s41467-021-27529-5

Cited by 154 publications

(118 citation statements)

References 72 publications

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“…Neither of these two types can perfectly integrate tough adhesion and reusability due to their intrinsic drawbacks. Temporary elastomer adhesives can directly adhere to the solid surfaces through reversible interactions, as exemplified by Van der Waals interaction, [ 25 ] hydrogen bonding, [ 26 ] hydrophobic interaction, [ 27 ] reversible covalent bonds, [ 28 , 29 ] and polymer entanglements, [ 30 ] etc. Such adhesives usually show rapid, immediate, and repeatable adhesion, whereas the adhesion toughness is low because of limited hysteresis of the bulk during interfacial separation.…”

Section: Introductionmentioning

confidence: 99%

Tough, Instant, and Repeatable Adhesion of Self‐Healable Elastomers to Diverse Soft and Hard Surfaces

Zan

Tang

et al. 2022

Advanced Science

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Repeatability and high adhesion toughness are usually contradictory for common polymer adhesives. Repeatability requires temporary interactions between the adhesive and the substrate, while high adhesion toughness is usually achieved by permanent bonding. Integrating these two features into one adhesive system is still a daunting challenge. Here, the development of a series of viscoelastic elastomers composed of a soft and hard segment is reported, which exhibit tough, instant, yet repeatable adhesion to a variety of soft and hard surfaces. Such a combination of mutually exclusive properties is attributed to the synergy of high mobility of polymer chains and massive viscoelastic dissipation of the elastomers around the interface. By optimizing the relaxation time and mechanical dissipation, the resulting adhesives can achieve a tough yet repeatable adhesion toughness above 2000 J m −2 , superior to the best‐in‐class commercial adhesives. Numerous acrylate monomers are proven applicable to the preparation of such adhesives, validating the universality of the fabrication method. The application of these elastomers as adhesive and protective layers in soft electronics by virtue of their universal and tough adhesion to various soft and hard substrates is also demonstrated.

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Section: Introductionmentioning

confidence: 99%

Tough, Instant, and Repeatable Adhesion of Self‐Healable Elastomers to Diverse Soft and Hard Surfaces

Zan

Tang

et al. 2022

Advanced Science

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“…Figure 3E showed 10 tensilerelaxation cycles at 100% strain. The tensile strength decreased after the first tensile cycle due to the inevitable viscosity of the polymer matrix and some permanently broken chemical bonds (Liu et al, 2021;Xue et al, 2021). The subsequent coincident tensile cycles, indicating that the reversible bond fracture and recombination had high repeatability and stability.…”

Section: Mechanical Properties Of the Hydrogelsmentioning

confidence: 99%

Highly Transparent, Self-Healing, and Self-Adhesive Double Network Hydrogel for Wearable Sensors

Chen

Liu

Wang

et al. 2022

Front. Bioeng. Biotechnol.

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Hydrogel-based flexible electronic devices are essential in future healthcare and biomedical applications, such as human motion monitoring, advanced diagnostics, physiotherapy, etc. As a satisfactory flexible electronic material, the hydrogel should be conductive, ductile, self-healing, and adhesive. Herein, we demonstrated a unique design of mechanically resilient and conductive hydrogel with double network structure. The Ca2+ crosslinked alginate as the first dense network and the ionic pair crosslinked polyzwitterion as the second loose network. With the synthetic effect of these two networks, this hydrogel showed excellent mechanical properties, such as superior stretchability (1,375%) and high toughness (0.57 MJ/m3). At the same time, the abundant ionic groups of the polyzwitterion network endowed our hydrogel with excellent conductivity (0.25 S/m). Moreover, due to the dynamic property of these two networks, our hydrogel also performed good self-healing performance. Besides, our experimental results indicated that this hydrogel also had high optical transmittance (92.2%) and adhesive characteristics. Based on these outstanding properties, we further explored the utilization of this hydrogel as a flexible wearable strain sensor. The data strongly proved its enduring accuracy and sensitivity to detect human motions, including large joint flexion (such as finger, elbow, and knee), foot planter pressure measurement, and local muscle movement (such as eyebrow and mouth). Therefore, we believed that this hydrogel had great potential applications in wearable health monitoring, intelligent robot, human-machine interface, and other related fields.

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“…In water and marine environments, adhesives are indispensable for specific applications such as underwater repair, soft underwater robotics, underwater communication, biomedicine, and tissue repair. [ 1–6 ] However, the adhesive joints on dry surfaces generally become less efficient in high‐moisture environments. The adhesion degrades because solid–solid adhesion generated by permanent and reversible interactions is significantly reduced when a hydration layer is formed on the surfaces.…”

Section: Introductionmentioning

confidence: 99%

Design of Double‐Network Click‐Gels for Self‐Contained Underwater Adhesion and Energy‐Wise Applications in Floating Photovoltaics

Wang

et al. 2022

Adv Funct Materials

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Facile fabrication of rapid, firm, and reversible underwater adhesion used on different adherets is challenging but is of primary importance for many industrial and biomedical applications. Herein, tough, stretchy, moldable, and semitransparent gels are developed for self‐contained underwater adhesives. The selected structural components, well‐defined double‐network (DN) structures, and one‐pot synthesis realize synergistic adhesion and cohesion engineering, which deliver instant, solid, reversible, and long‐term adhesives with a high underwater adhesion strength of over 0.84 MPa. The underwater adhesion strength is among the best‐performing tape‐type underwater adhesives. In order to develop new energy‐related applications for underwater adhesion, the first example of combining underwater adhesion with solar power applications is demonstrated. Taking the benefits of the direct‐contact design at the air/water interface, the click‐gel‐mounted floating photovoltaic (FPV) system significantly increases the power conversion efficiency by 20% due to the enhanced active cooling effects, surpassing several conventional photovoltaic technologies on both land and water. The click‐gel also rapidly responds to several oscillatory motions on the FPV platform. This study shines a light on the facile fabrication of DN click‐gels for underwater adhesives and provides their future perspectives in energy‐wise, low‐maintenance, and stimuli‐responsive applications.

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Hydrogel tapes for fault-tolerant strong wet adhesion

Cited by 154 publications

References 72 publications

Tough, Instant, and Repeatable Adhesion of Self‐Healable Elastomers to Diverse Soft and Hard Surfaces

Tough, Instant, and Repeatable Adhesion of Self‐Healable Elastomers to Diverse Soft and Hard Surfaces

Highly Transparent, Self-Healing, and Self-Adhesive Double Network Hydrogel for Wearable Sensors

Design of Double‐Network Click‐Gels for Self‐Contained Underwater Adhesion and Energy‐Wise Applications in Floating Photovoltaics

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