Supramolecular topology controlled self-healing conformal hydrogels for stable human–machine interfaces

Wang, Chengyu; Zhang, Jin; Chen, Hao; Wang, Zhengfu; Huang, Caihua; Tan, Yebang

doi:10.1039/d2tc01014c

Cited by 21 publications

(19 citation statements)

References 52 publications

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“…Moreover, the structure formula and corresponding 1 H NMR spectra are shown in Figure S3–S6. The characteristic signals appearing at 5.55–6.27 and 8.15–8.20 ppm for A-DMAPAM are attributed to the acryl group and the aromatic ring, respectively . This result was consistent with the structure in ATR-FTIR, indicating the successful reaction of the adhesive factor.…”

Section: Resultssupporting

confidence: 79%

“…Specifically, 2.7 g of adenine, 16.35 g of 1,2-dibromoethane, 100 mL of DMF, and 6.63 g of K 2 CO 3 were mixed, and the reaction was carried out at room temperature (RT) under N 2 protection for 48 h. The yellow solid A–Br was obtained by filtration and rotary evaporation. In Figure S5, the procedure for synthesizing the adhesive group (A-DMAPAM) was based on a previously reported work . The DMF mixture containing A–Br (1.5 g) and DMAPAM (1.45 g) was stirred at 80 °C under N 2 atmosphere for 10 h. The crude products were dissolved in methanol after rotary evaporation.…”

Section: Materials and Methodsmentioning

confidence: 99%

“…In Figure S5, the procedure for synthesizing the adhesive group (A-DMAPAM) was based on a previously reported work. 33 The DMF mixture containing A−Br (1.5 g) and DMAPAM (1.45 g) was stirred at 80 °C under N 2 atmosphere for 10 h. The crude products were dissolved in methanol after rotary evaporation. Subsequently, the A-DMAPAM was extracted by dissolution− precipitation and dried under vacuum.…”

Section: Preparation Of Adhesive Groupsmentioning

confidence: 99%

“…However, the G″ of H-A-CP-3 remained the highest, which reflected the viscous property in solid materials. 33 Besides, the cyclic tensile experiment was applied to investigate the self-recovery and antifatigue performance of H-A-CP-3 samples. In Figure 3d, the hysteresis loop in the initial loading−unloading cycle under the strain of 500% indicated the breakage of hydrogen bonds in the networks.…”

Section: Mechanical Properties and Elasticity Of The H-a-cp Hydrogelsmentioning

confidence: 99%

“…Although promising, the balance of mechanical properties and conductivity is affected due to the weak cohesion provided by the hydrogen bonding in the current report system. Therefore, it is highly expected to design conformal adhesive hydrogels with sustaining electrochemical and mechanical properties by modifying the adenine molecule. − Wang et al designed a supramolecular topology-controlled hydrogel sensor by employing quaternized adenine . Due to the balance between adhesion and cohesion, the hydrogel exhibited a certain tensile strength and excellent adherence.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Bio-Inspired Homogeneous Conductive Hydrogel with Flexibility and Adhesiveness for Information Transmission and Sign Language Recognition

Wang

Hsu

et al. 2023

ACS Appl. Mater. Interfaces

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The wearable electronic technique is increasingly becoming an effective approach to overcoming the communication obstacles between signers and non-signers. However, the efficacy of conducting hydrogels currently proposed as flexible sensor devices is hindered by their poor processability and matrix mismatch, which frequently results in adhesion failure at the combined interfaces and deterioration of mechanical and electrochemical performance. Herein, we propose a hydrogel composed of a rigid matrix in which the hydrophobic and aggregated polyaniline was homogeneously embedded, while quaternate-functionalized nucleobase moieties endowed the flexible network with adhesiveness. Accordingly, the resulting hydrogel with chitosan-graf tpolyaniline (chi-g-PANI) copolymers exhibited a promising conductivity (4.8 S• m −1 ) because of the uniformly dispersed polyaniline components and a high strain strength (0.84 MPa) because of the chain entanglement of chitosan after soaking. In addition, the modified adenine molecules not only realized synchronization in improving the stretchability (up to 1303%) and exhibiting a skin-like elastic modulus (≈184 kPa), but also provided a durable interfacial contact with various materials. The hydrogel was further fabricated into a strain-monitoring sensor for information encryption and sign language transmission based on its sensing stability and strain sensitivity of up to 2.77. The developed wearable sign language interpreting system provides an innovative strategy to assist auditory or speech-impaired people in communicating with non-signers using visual−gestural patterns including body movements and facial expressions.

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Section: Resultssupporting

confidence: 79%

Section: Materials and Methodsmentioning

confidence: 99%

Section: Preparation Of Adhesive Groupsmentioning

confidence: 99%

Section: Mechanical Properties and Elasticity Of The H-a-cp Hydrogelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Bio-Inspired Homogeneous Conductive Hydrogel with Flexibility and Adhesiveness for Information Transmission and Sign Language Recognition

Wang

Hsu

et al. 2023

ACS Appl. Mater. Interfaces

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A Low‐Hysteresis and Highly Stretchable Ionogel Enabled by Well Dispersed Slidable Cross‐Linker for Rapid Human‐Machine Interaction

Bao

Zhu

et al. 2023

Adv Funct Materials

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Ionic conductive soft materials for mimicking human skin are a promising topic since they can be thought of as a possible basis for biomimetic sensing. In pursuit of devices with a long working range and low signal delay, conductive materials with low hysteresis and good stretchability are highly demanded. To overcome the challenges of highly stretchable conductive materials with good resilience, herein a chemical design is proposed where polyrotaxanes act as topological cross-linkers to enhance the stretchability by sliding-induced reduced stress concentration while the compatible ionic liquid is introduced as a dispersant for low hysteresis. The obtained ionogels exhibit versatile properties more than low hysteresis (residual strain = 7%) and good stretchability (550%), and also anti-fatigue, biocompatibility, and good adhesion. The low hysteresis is attributed to lower energy dissipation from the well-dispersed polyrotaxanes by compatible ionic liquids. The mechanism provides a new insight in fabricating highly stretchable and low-hysteresis slide-ring materials. Furthermore, the conductivity of the ionogels and their responses to strains and temperatures are measured. Benefiting from the good conductivity and low hysteresis, the ionogel is applied to develop a wireless communication system to realize rapid human-machine interactions.

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Kirigami‐Inspired 3D‐Printable MXene Organohydrogels for Soft Electronics

Zhuo,

Zhou,

Liu

et al. 2023

Adv Funct Materials

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Conductive hydrogels are compelling materials for the development of soft electronics; however, their essential attributes such as high sensitivity, excellent stretchability, and environmental stability have rarely been achieved simultaneously in one hydrogel. Herein, a Kirigami‐inspired strategy is proposed to improve organohydrogel sensitivity without sacrificing their mechanical stretchability and environmental stability . The organohydrogels with multiple interpenetrating networks are synthesized by introducing sodium alginate nanofibrils and conductive MXene nanoflakes into polymer double networks infiltrated with glycerol–water mixtures, featuring remarkable stretchability (>5000%), good sensitivity, and water retention (>30 days). The Kirigami structures are further applied to enhance strain sensitivity, achieving a gauge factor of 29.1, which is ≈5.5 times that of an unstructured organohydrogel. Using the Kirigami‐inspired sensors, a durable glove is developed for grabbing underwater objects through operating a robotic arm, demonstrating a subaqueous interactive human–machine interfacing.Meanwhile, by integrating the wearable sensor with a machine learning algorithm, a wearable Morse code intelligent recognition system is demonstrated, enabling real‐time conversion of Morse code signs into speech with superior recognition accuracy (>99%) and fast response time (≈17 ms). This work offers a new route to synthesize highly sensitive, stretchable, and extremely tolerant organohydrogels, providing a promising platform for next‐generation soft electronics.

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Supramolecular topology controlled self-healing conformal hydrogels for stable human–machine interfaces

Abstract: Soft materials (such as hydrogels) with good conformal capabilities and self-healing properties have shown considerable promise in the realms of human-machine interfaces. However, creating wearable hydrogels with excellent adhesion, mechanical...

Cited by 21 publications

References 52 publications

Bio-Inspired Homogeneous Conductive Hydrogel with Flexibility and Adhesiveness for Information Transmission and Sign Language Recognition

Bio-Inspired Homogeneous Conductive Hydrogel with Flexibility and Adhesiveness for Information Transmission and Sign Language Recognition

A Low‐Hysteresis and Highly Stretchable Ionogel Enabled by Well Dispersed Slidable Cross‐Linker for Rapid Human‐Machine Interaction

Kirigami‐Inspired 3D‐Printable MXene Organohydrogels for Soft Electronics

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