Hydrogel-based temperature sensor with water retention, frost resistance and remoldability

Li, Yueshan; Hu, Chengxin; Lan, Ji; Yan, Bin; Zhang, Yulin; Shi, Lingying; Ran, Rong

doi:10.1016/j.polymer.2019.122027

Cited by 83 publications

(58 citation statements)

References 32 publications

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“…The measuring range of the above-mentioned hydrogel-based sensors typically ranges from room temperature to 50°C because common hydrogels are intrinsically volatile at high temperatures and freezable at sub-zero temperatures. In order to broaden their temperature sensing range to the extremely hot or cold environment, strategies such as adding glycerol, EG and CaCl 2 ( Li et al., 2020 ) or using nonvolatile PILs ( Liu et al., 2020c ) can be adopted.…”

Section: Applications Of Skin-like Hydrogel Devicesmentioning

confidence: 99%

Skin-like hydrogel devices for wearable sensing, soft robotics and beyond

Ying

2021

iScience

125

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Summary Skin-like electronics are developing rapidly to realize a variety of applications such as wearable sensing and soft robotics. Hydrogels, as soft biomaterials, have been studied intensively for skin-like electronic utilities due to their unique features such as softness, wetness, biocompatibility and ionic sensing capability. These features could potentially blur the gap between soft biological systems and hard artificial machines. However, the development of skin-like hydrogel devices is still in its infancy and faces challenges including limited functionality, low ambient stability, poor surface adhesion, and relatively high power consumption (as ionic sensors). This review aims to summarize current development of skin-inspired hydrogel devices to address these challenges. We first conduct an overview of hydrogels and existing strategies to increase their toughness and conductivity. Next, we describe current approaches to leverage hydrogel devices with advanced merits including anti-dehydration, anti-freezing, and adhesion. Thereafter, we highlight state-of-the-art skin-like hydrogel devices for applications including wearable electronics, soft robotics, and energy harvesting. Finally, we conclude and outline the future trends.

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Section: Applications Of Skin-like Hydrogel Devicesmentioning

confidence: 99%

Skin-like hydrogel devices for wearable sensing, soft robotics and beyond

Ying

2021

iScience

125

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“…A 3D-printing hydrogel was developed by cooperating the physically gelated PVA as the stretchable polymer network together with alkaline polysaccharide CS, as shown in Figure 3(b), which improved the mechanical strength of such blend system [42]. Solvents including DMSO, ethylene glycol, and glycerol could serve as plasticizers that promote structural stability and help produce firmer PVA hydrogels due to the penetration of the PVA gel matrix [43][44][45]. A high-concentration solution of alkaline metal hydroxide can also promote the physical crosslinking of PVA, increase the crystallinity, and form elastic hydrogels with low water content and the swelling ratio [46,47].…”

Section: Physical Modificationmentioning

confidence: 99%

Poly(vinyl alcohol) Hydrogels: The Old and New Functional Materials

Wang

Bai

Shao

et al. 2021

International Journal of Polymer Science

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Hydrogels have three-dimensional network structures, high water content, good flexibility, biocompatibility, and stimulation response, which have provided a unique role in many fields such as industry, agriculture, and medical treatment. Poly(vinyl alcohol) PVA hydrogel is one of the oldest composite hydrogels. It has been extensively explored due to its chemical stability, nontoxic, good biocompatibility, biological aging resistance, high water-absorbing capacity, and easy processing. PVA-based hydrogels have been widely investigated in drug carriers, articular cartilage, wound dressings, tissue engineering, and other intelligent materials, such as self-healing and shape-memory materials, supercapacitors, sensors, and other fields. In this paper, the discovery, development, preparation, modification methods, and applications of PVA functionalized hydrogels are reviewed, and their potential applications and future research trends are also prospected.

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“…At present, there are two main solutions to solve these problems, one is to reduce the freezing point of the system by using a solvent, [41,42] and the other is to reduce the freezing point by using an inorganic salt. [43,44] The strategy of using an EG/H 2 O binary solvent instead of a distilled water solvent endowed the hydrogel with superb anti-freezing properties. Compared with the composite preparation process of replacing a solvent by solvent soaking after the hydrogel was formed, the one-pot method used to prepare the PVA/agar-EG organic hydrogel was facile and avoided solvent waste.…”

Section: Resultsmentioning

confidence: 99%

PVA/Agar Interpenetrating Network Hydrogel with Fast Healing, High Strength, Antifreeze, and Water Retention

Han

Fan

et al. 2020

Macro Chemistry & Physics

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concentration to achieve a self-healing ability and mechanical properties. [20] Among them, the main design methods are physical and chemical design concepts. The hydrogels prepared based on physical crosslinking interact through hydrogen bonding, [21,22] hydrophobic association, electrostatic interaction, [23] segment entanglement, [24] and other noncovalent [25,26] interactions, while the traditional chemical cross-linking method mainly takes advantage of the interaction mode of dynamic binding. [27] That is, the dynamic exchange process occurs when the chain is broken, contributing to the self-healing effect. At the same time, owing to the high water content, it is difficult for traditional hydrogels to avoid high water loss and early degradation during use. Additionally, their inherent properties such as light transmittance will be destroyed under freezing conditions. However, compared with the traditional hydrogel preparation methods, the multifunctional hydrogel requires more steps to synthesize, increasing the difficulty of preparation. Thus, it is a great challenge for traditional hydrogels to operate under complex working conditions such as high-and low-temperature fluctuations. Therefore, to improve the applicability of hydrogels under complex working conditions, various methods have been suggested, such as network interpenetrating structure hydrogels, [28] double network hydrogels, [29-31] nanocomposite structure hydrogels, [32-35] and host-guest supermolecule hydrogels. [36,37] Different from other methods, network interpenetrating structure hydrogels are multifunctionally designed to avoid the disadvantages of pure water loss and degradation of hydrogels due to the higher fault tolerance and compatibility. Polyvinyl alcohol (PVA) matrices can be utilized to achieve a balance of self-healing ability and mechanical properties and can be multifunctionalized by modification with a variety of composite products. PVA hydrogels are formed in a variety of ways. Moreover, hydrogen bond cross-linking or external dynamic binding can be introduced to achieve self-healing properties. The PVA hydrogel has a uniform network structure and large energy consumption capacity that make it extremely light transmissive and give it an outstanding comprehensive performance. These reversible and breakable high-density hydrogenbonded cross networks provide PVA hydrogels with self-healing effects at room temperature without any irritation or healing Traditional self-healing hydrogels have great application prospects in biological engineering because of their extremely high water content, but their durability cannot be easily guaranteed. Therefore, developing a rapid self-healing hydrogel with long-lasting water retention capacity is still a significant challenge. A highstrength and fast self-healing hydrogel with an interpenetrating double network based on polyvinyl alcohol/agar-ethylene glycol (PVA/agar-EG) is proposed. Polyvinyl alcohol (PVA) and agar are designed for the construction of the interpenetrating network. Further...

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Hydrogel-based temperature sensor with water retention, frost resistance and remoldability

Cited by 83 publications

References 32 publications

Skin-like hydrogel devices for wearable sensing, soft robotics and beyond

Skin-like hydrogel devices for wearable sensing, soft robotics and beyond

Poly(vinyl alcohol) Hydrogels: The Old and New Functional Materials

PVA/Agar Interpenetrating Network Hydrogel with Fast Healing, High Strength, Antifreeze, and Water Retention

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