Synthesis of strong and highly stretchable, electrically conductive hydrogel with multiple stimuli responsive shape memory behavior

Zhang, Xiao; Cai, Junqi; Liu, Wenqiang; Liu, Weifeng; Qiu, Xueqing

doi:10.1016/j.polymer.2019.122147

Cited by 29 publications

(17 citation statements)

References 57 publications

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Section: Engineering Functional Conductive Hydrogelsmentioning

confidence: 99%

“…Notably, introducing proper physical or chemical interactions can enhance the mechanical properties of shape memory conductive hydrogels. A 5,5,6,6-tetrahydroxy-3,3,3,3-tetramethyl-1,1-spirobisindane (TTSBI)-Fe 3+ /poly(vinyl alcohol) (PVA) hydrogel matrix conductive hydrogel manifested strong mechanical properties because of the construction of hydrogen bonds, hydrophobic interactions, and metal coordination bonds in the hydrogel matrix (Figure c) . The hydrogel showed shape memory response to multiple stimuli, including temperature, solvent, and Fe 3+ because of the crystalline domains of the PVA chains, solvent–polymer interactions, and catechol/Fe 3+ interactions, respectively.…”

Section: Engineering Functional Conductive Hydrogelsmentioning

confidence: 99%

See 1 more Smart Citation

Functional Conductive Hydrogels for Bioelectronics

Wang

Zeng

et al. 2020

ACS Materials Lett.

253

174

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Conductive hydrogels are widely used in various applications such as artificial skin, flexible and implantable bioelectronics, and tissue engineering. However, it is still a challenge to formulate hydrogels with high electrical conductivity without compromising their physicochemical properties (e.g., toughness, stretchability, and biocompatibility). Additionally, incorporating other functions, such as self-healing, shape memory, and wet adhesion, into conductive hydrogels is critical to many practical applications of hydrogel bioelectronics. In this perspective, we highlight recent progress in the development of functional conductive hydrogels.We then discuss the potential applications and challenges faced by conductive hydrogels in the areas of wearable/implantable electronics and cell/tissue engineering. Conductive hydrogel can serve as an important building block for bioelectronic devices in personalized healthcare and other bioengineering areas.

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Section: Engineering Functional Conductive Hydrogelsmentioning

confidence: 99%

Section: Engineering Functional Conductive Hydrogelsmentioning

confidence: 99%

Functional Conductive Hydrogels for Bioelectronics

Wang

Zeng

et al. 2020

ACS Materials Lett.

253

174

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“…The hydrogel samples were prepared in thickness of 2 mm and the electrical conductivity values (𝜎, mS cm −1 ) were measured according to the following equation: 𝜎 = L/RA, where L, A, and R were, respectively, the length, cross-sectional area and the electrical resistance of the hydrogel. [24,47] For the capability of strain sensing detection, the two ends of hydrogel sensor were sandwiched by conductive wires and fixed on the universal testing machine. It was then connected to the electrodes of the electrochemical workstation through conductive wires.…”

Section: Methodsmentioning

confidence: 99%

Double Network Hydrogel Sensors with High Sensitivity in Large Strain Range

Zhang

Wang

Dai

et al. 2021

Macro Materials & Eng

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Owing to their preferable flexibility and facilitation to integrate with various apparel products, flexible sensors with high sensitivity are highly favored in the fields of environmental monitoring, health diagnosis, and wearable electronics. However, great challenges still remain in integrating high sensitivity with wide sensing range in one single flexible strain sensor. Herein, a new stretchable conductive gel-based sensor exhibiting remarkable properties regarding stretchability and sensitivity is developed via improving the ionic conductivity of the PVA/P(AM-AANa) double network hydrogel. Specifically, the strain sensor developed exhibits an excellent elongation of 549%, good fatigue resistance, and recovery performance. Simultaneously, the hydrogel strain sensor shows a high conductivity of 25 mS cm −1 , fast response time of 360 ms, and a linear response (gauge factor = 4.75) to external strain (≈400%), which endow the sensor with accurate and reliable capacities to detect various human movements. Integrating the merits of flexibility, environment friendliness, and high sensitivity, the conductive gel-based sensor has promising application prospects in human-machine interfaces, touchpads, biosensors, electronic skin, wearable electronic devices, and so on.

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“…This is because the ionic bonds formed between the carboxyl groups and Fe 3+ in the MPASP-PAA/Fe 3+ composite conductive hydrogel, as well as the intermolecular hydrogen bonds, can be used as physical cross-linking points, so that the hydrogel has good mechanical properties. However, when the concentration of Fe 3+ is higher than a certain value, free radical polymerization will be delayed, and the molecular weight of the polymer in the hydrogel will decrease, [22,23] resulting in a decrease in the mechanical properties of the MPASP-PAA/Fe 3+ composite conductive hydrogel. Therefore, the mechanical strength of the conductive hydrogels can be tuned by varying experiment parameters such as Fe 3+ concentration, chemical crosslinking density.…”

Section: The Effect Of Different Mpasp and Fe 3+ Content On The Tensi...mentioning

confidence: 99%

Preparation of MPASP‐PAA/Fe³⁺ Composite Conductive Hydrogel with Physical and Chemical Double Crosslinking Structure and Its Application in Flexible Strain Sensors

Liu

Yang

et al. 2022

Macro Chemistry & Physics

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Conductive hydrogels show broad prospects in wearable electronic devices. However, the conductive hydrogel cross‐linked only by chemical bonds has the shortcomings of being hard and brittle, easy to break under pressure. In order to solve these problems, the MPASP‐PAA/Fe3+ composite conductive hydrogel is prepared by the method of physical and chemical double crosslinking using modified polyaspartic acid (MPASP) as the chemical crosslinking agent and FeCl3 as the physical crosslinking agent. Compared with traditional chemical crosslinking agents such as N′N‐methylene bisacrylamide, the MPASP can not only increase mechanical properties of the conductive hydrogel, but also improve the biodegradability and biocompatibility. At the same time, FeCl3 as a physical crosslinking agent can also enhance the conductivity and toughness of the conductive hydrogel. When MPASP and Fe3+ content are 2.5 wt% and 0.75 mol%, respectively, the MPASP‐PAA/Fe3+ composite conductive hydrogel exhibits high conductivity (0.12 S m−1), sensitivity (4.93), and stretchability (329%). In addition, its compressive strength is as high as 1081.39 KPa. The flexible strain sensor assembled by the MPASP‐PAA/Fe3+ composite conductive hydrogel can not only monitor human joint movements such as elbow and wrist bending, but also detect subtle vibrations such as vocalization and swallowing.

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Synthesis of strong and highly stretchable, electrically conductive hydrogel with multiple stimuli responsive shape memory behavior

Cited by 29 publications

References 57 publications

Functional Conductive Hydrogels for Bioelectronics

Functional Conductive Hydrogels for Bioelectronics

Double Network Hydrogel Sensors with High Sensitivity in Large Strain Range

Preparation of MPASP‐PAA/Fe³⁺ Composite Conductive Hydrogel with Physical and Chemical Double Crosslinking Structure and Its Application in Flexible Strain Sensors

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Synthesis of strong and highly stretchable, electrically conductive hydrogel with multiple stimuli responsive shape memory behavior

Cited by 29 publications

References 57 publications

Functional Conductive Hydrogels for Bioelectronics

Functional Conductive Hydrogels for Bioelectronics

Double Network Hydrogel Sensors with High Sensitivity in Large Strain Range

Preparation of MPASP‐PAA/Fe3+ Composite Conductive Hydrogel with Physical and Chemical Double Crosslinking Structure and Its Application in Flexible Strain Sensors

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Product

Resources

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Preparation of MPASP‐PAA/Fe³⁺ Composite Conductive Hydrogel with Physical and Chemical Double Crosslinking Structure and Its Application in Flexible Strain Sensors