Hydrogel with Ultrafast Self-Healing Property Both in Air and Underwater

Chen, Wei Peng; Hao, De Zhao; Wan, Hao; Guo, Xing Lin; Jiang, Lei

doi:10.1021/acsami.7b17118

Cited by 213 publications

(182 citation statements)

References 49 publications

(72 reference statements)

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“…Specifically, the polymer long chains are randomly coiled within the networks without deformation. Under tensile strain, the dynamic and reversible interactions could increase the flexibility of the network through unwrapping and sliding of polymer chains to dissipate energy . Moreover, the chemical crosslinking between PAM also increased the stretchability of the binary networked hydrogels.…”

Section: Resultsmentioning

confidence: 99%

Stretchable, Transparent, and Self‐Patterned Hydrogel‐Based Pressure Sensor for Human Motions Detection

Zhang

Shao

et al. 2018

Adv Funct Materials

473

328

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In this study, a binary networked conductive hydrogel is prepared using acrylamide and polyvinyl alcohol. Based on the obtained hydrogel, an ultrastretchable pressure sensor with biocompatibility and transparency is fabricated cost effectively. The hydrogel exhibits impressive stretchability (>500%) and superior transparency (>90%). Furthermore, the self-patterned microarchitecture on the hydrogel surface is beneficial to achieve high sensitivity (0.05 kPa −1 for 0-3.27 kPa). The hydrogel-based pressure sensor can precisely monitor dynamic pressures (3.33, 5.02, and 6.67 kPa) with frequencydependent behavior. It also shows fast response (150 ms), durable stability (500 dynamic cycles), and negligible current variation (6%). Moreover, the sensor can instantly detect both tiny (phonation, airflowing, and saliva swallowing) and robust (finger and limb motions) physiological activities. This work presents insights into preparing multifunctional hydrogels for mechanosensory electronics.

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Section: Resultsmentioning

confidence: 99%

Stretchable, Transparent, and Self‐Patterned Hydrogel‐Based Pressure Sensor for Human Motions Detection

Zhang

Shao

et al. 2018

Adv Funct Materials

473

328

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“…The self‐healing ability of PVA‐CNDs hydrogel was verified by macroscopic self‐healing experiments, containing direct visual observation and mechanical studies . We prepared hydrogel by the molds, one of which was dyed with Rhodamine B for better differentiation.…”

Section: Resultsmentioning

confidence: 99%

“…The CNDs were dispersed in deionized water to a concentration of 0.5 mg mL −1 . Here, 4 g PVA was dissolved in 16 mL deionized water (water bath at 90 °C for 2 h) to form a uniform transparent PVA solution . Then, the bubbles of the solution were removed after ultrasound for 30 min, the PVA solution was cast into a mold.…”

Section: Methodsmentioning

confidence: 99%

Poly(vinyl alcohol)–Carbon Nanodots Fluorescent Hydrogel with Superior Mechanical Properties and Sensitive to Detection of Iron(III) Ions

Shao

Wang

et al. 2019

Macro Materials & Eng

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A high‐strength fluorescent hydrogel is prepared by physical cross‐linking of carbon nanodots (CNDs) with poly(vinyl alcohol) (PVA). The stretching and compression of the PVA hydrogel are improved with CNDs by 176% and 64%, respectively. It still has excellent self‐healing behaviors without adding other healing agents. In addition, the search for rapid detection of heavy metals is still a huge challenge. The resulting hydrogel exhibits fluorescence quenching in the presence of Fe3+ by the fluorescence characteristics of CNDs, which has high selectivity and sensitivity. The PVA‐CNDs fluorescent hydrogel can be used as a solid detection platform for Fe3+, where the detection limit is found to be 10 µm for Fe3+ by fluorescence studies.

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“…Previously reported underwater dynamic bonds are mainly of two types: i) boronic acid derivatives that contain boronic‐ester or boroxine bonds; ii) hydrogen bonds between catechol groups, which are inspired by nature . However, they both have many limitations.…”

Section: Methodsmentioning

confidence: 99%

A Highly Stretchy, Transparent Elastomer with the Capability to Automatically Self‐Heal Underwater

et al. 2018

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self-healing polymers based on hydrogen bond [7,8] and metal-ligand coordination [9] have also been reported.Considering the long-term usage of self-healing polymers, high-humidity conditions or even underwater conditions cannot be avoided. Therefore, it is now recognized that the stabilities of self-healing polymer underwater have become necessary, not mentioning the huge importance in the areas of biological and environmental fields. [13,14] However, most reversible self-healing polymers are not stable under humid conditions owing to the limitations of their reversible bonds for self-healing process. Currently reported reversible self-healing polymers are mostly based on dynamic bonds including hydrogen bond, metal-ligand coordination, ionic interaction, etc. Majorities of these dynamic bonds are not stable in water. Water molecules can play multiple roles: donor and acceptor of hydrogen bonds, ligand, polar solvent, etc. It means the dynamic bonds will be disturbed in many ways: water molecules will saturate the hydrogen bonds, coordinate with the metal cation, as well as solvate the ions, and thus significantly lower the bonding constants of these bonds. The self-healing materials will then swell and lose their self-healing capability.Previously reported underwater dynamic bonds are mainly of two types: i) boronic acid derivatives that contain boronic-ester or boroxine bonds; [15][16][17][18][19][20] ii) hydrogen bonds between catechol groups, which are inspired by nature. [19][20][21][22][23][24][25][26] However, they both have many limitations. The boronic acid derivatives suffer from severe hydrolysis and they are very unstable underwater. The nature-inspired catechol groups can bond well with each other and keep the adhesion underwater. However, the hydrogen bonds between catechol are very sensitive to pH conditions, which strongly restrict their practical applications. Recently, Bao and co-workers had a breakthrough of using specially designed hydrogen bonding directly underwater self-healing polymers, but swelling is still a long-term concern due to the nature of water molecules. [27] The key question is, how can we design and develop a robust, reversible bond underwater, and how can we introduce the bond into self-healing polymers.Herein, we utilized a brand-new approach of polymer design and successfully developed a transparent elastomer that can autonomously self-heal under all types of water conditions. The elastomer has similar mechanical properties like conventional Polymer materials that are able to self-heal in humid conditions or even in water are highly desirable for their industrial applications. However, the development of underwater self-healing polymer materials is very challenging since water molecules can readily disturb traditional noncovalent bonds, such as saturate the hydrogen bonds, coordinate with the metal cation, as well as solvate the ions. Here, a new type of dipole-dipole interactions is employed as the driving force, combining with highly polar and hydrophobic fluorinated pol...

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Hydrogel with Ultrafast Self-Healing Property Both in Air and Underwater

Cited by 213 publications

References 49 publications

Stretchable, Transparent, and Self‐Patterned Hydrogel‐Based Pressure Sensor for Human Motions Detection

Stretchable, Transparent, and Self‐Patterned Hydrogel‐Based Pressure Sensor for Human Motions Detection

Poly(vinyl alcohol)–Carbon Nanodots Fluorescent Hydrogel with Superior Mechanical Properties and Sensitive to Detection of Iron(III) Ions

A Highly Stretchy, Transparent Elastomer with the Capability to Automatically Self‐Heal Underwater

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