A tough hydrogel with fast self-healing and adhesive performance for wearable sensors

Lu, Chunyin; Qiu, Jianhui; Zhao, Wei; Sakai, Eiichi; Zhang, Guohong

doi:10.1016/j.colsurfa.2021.127793

Cited by 13 publications

(7 citation statements)

References 38 publications

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“…The adhesion strength is maintained at ≈13.71 kPa for plastic, 18.01 kPa for metal (copper plate), 18.76 kPa for skin, and 36.58 kPa for glass after three cycles (Figure 3b), which is similar to the previously reported hydrogel materials. [ 40,41 ] There is almost no significant loss in adhesion strength, indicating an excellent adhesive repeatability. It is ascribed that the electrostatic interaction between the functional groups (e.g., carboxyl groups in PAA matrix and groups (i.e., ‐OH, ‐F, = O) of MXene nanosheets) with the different surfaces.…”

Section: Resultsmentioning

confidence: 99%

Stretchable and Photothermal MXene/PAA Hydrogel in Strain Sensor for Wearable Human‐Machine Interaction Electronics

Bai

et al. 2023

Adv Materials Technologies

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provides the accurate and real-time external information for machine. [9] The materials of flexible sensor should comply with the following criteria: i) excellent flexibility to match human tissue, ii) high and stable conductivity to rapidly and reliably respond the signals, iii) tight adhesion to human body surface, iv) safety and nontoxic to contact with the human body. Hydrogel is a kind of highly hydrophilic 3D network gel, which are like human tissues in structure and composition. [10] For example, our research group has prepared a 3D porous cellulose hydrogel to realize a highly sensitive flexible strain sensor. [11] Tao et al. fabricated a micropyramid-patterned double-network ionic organ hydrogels for flexible sensor to detect subtle pressure changes. [12] They are desirable to satisfy the requirement of flexible sensor by the unique properties including flexibility, extreme precision, high durability, and skin-friendliness by the adjusted structure and components. At present, it is limited to the development of a single function in wearable HMI electronics. However, it is still a challenge to develop multifunction hydrogel with excellent properties for high-precision flexible strain sensor to achieve precise control in wearable HMI electronics.The personal thermal management (PTM) technology provides specific temperature control and health monitoring for various novel interactive ways of wearable HMI electronics, and effectively improve practicality and user experience. [13,14] As one of the representative categories, photothermal conversion technology converts light energy into thermal energy by reflection and absorption, which conforms to the concept of energy saving and has been applied in PTM technology. [15,16] Nowadays, flexible hydrogels with excellent photothermal property have been obtained by introducing photothermal conversion agents (i.e., carbon nanomaterials, [17] organic materials, [18] metal materials, [19] and semiconductor materials [20] ) into the matrix.As a new type of 2D transition metal carbides and nitrides, MXene has exhibited prominent photothermal conversion performance due to the profits from high light absorption and the localized surface plasmon resonance (LSPR) effect. [21,22] Accordingly, MXene hydrogel is one of the suitable candidates for flexible photothermal materials, which can be used in the Wearable human-machine interaction (HMI) is an advanced technology that realizes operations, collaborations, and interactions between human and machines in a co-located or coordinated way. As the core component of wearable HMI electronics, the flexible sensor is desirable to be intelligent, accurate, collaborative, and multifunctional for the feedback control. Here, the multifunctional MXene/polyacrylic acid (PAA) hydrogel is prepared by radical polymerization. As a flexible strain sensor, it exhibits high sensitivity (gauge factor ≈4.94), wide detection range (0-1081%) and stable signal output for 500 cycles. It can also monitor human movement and operate manipulator in real tim...

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Section: Resultsmentioning

confidence: 99%

Stretchable and Photothermal MXene/PAA Hydrogel in Strain Sensor for Wearable Human‐Machine Interaction Electronics

Bai

et al. 2023

Adv Materials Technologies

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“…Bionic hydrogels employed in wearable devices and biosensing include ionic conductive hydrogels, conductive polymer hydrogels, and conductive micro/nanocomposite hydrogels [60]. Materials and manufacturing processes may enable hydrogel with varying ionic and electrical conductivity, biocompatibility, biodegradability, antibacterial activity, self-healing and injectability, selfviscosity, transparency, and long-term stability extensibility, compressibility, and fatigue resistance, among other properties [65][66][67][68]. Currently, wearable technologies in MS are primarily used to monitor mobility and balance, and they may eventually play a more prominent role in assessing tiredness, tremor, and spasm [69,70].…”

Section: Hydrogels Applied In Ms and Its Characteristicsmentioning

confidence: 99%

Potential application of hydrogel to the diagnosis and treatment of multiple sclerosis

2022

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Multiple sclerosis (MS) is a chronic demyelinating disease of the central nervous system. This disorder may cause progressive and permanent impairment, placing significant physical and psychological strain on sufferers. Each progress in MS therapy marks a significant advancement in neurological research. Hydrogels can serve as a scaffold with high water content, high expansibility, and biocompatibility to improve MS cell proliferation in vitro and therapeutic drug delivery to cells in vivo. Hydrogels may also be utilized as biosensors to detect MS-related proteins. Recent research has employed hydrogels as an adjuvant imaging agent in immunohistochemistry assays. Following an overview of the development and use of hydrogels in MS diagnostic and therapy, this review discussed hydrogel’s advantages and future opportunities in the diagnosis and treatment of MS. Graphical abstract

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“…The overlap of wearable healthcare applications and flexible electronic engineering is guiding the development direction of functional soft materials , and device design integration. , Recently, hydrogel-based wearable sensors with high hydration, tunable functionality, and high sensitivity have shone in fields such as medical devices, − human–machine interfaces, − and flexible electrodes. − For example, Fu et al developed a super-stretchable conductive hydrogel based on triple crosslinking for sensitive monitoring of human physiological motions . Nevertheless, due to the lack of adhesion properties, the conventional hydrogel-based strain sensor required additional assistance to achieve close contact between the sensor and the substrate during usage, which largely impair the accuracy and durability of signal detection. − Meanwhile, these hydrogels were easily damaged during the complex and continuous movement of the human body, which limited their application especially in human health care monitoring. To satisfy the requirement of practical applications, the development of hydrogels with adhesiveness and self-healing attributes was highly desirable for strain sensors .…”

Section: Introductionmentioning

confidence: 99%

Stretchable Organohydrogel with Adhesion, Self-Healing, and Environment-Tolerance for Wearable Strain Sensors

Zeng

Gao

2023

ACS Appl. Mater. Interfaces

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Stretchable hydrogels as landmark soft materials have been efficiently utilized in the field of wearable sensing devices. However, these soft hydrogels mostly cannot integrate transparency, stretchability, adhesiveness, self-healing, and environmental adaptability into one system. Herein, a fully physically cross-linked poly(hydroxyethyl acrylamide)-gelatin dual-network organohydrogel is prepared in a phytic acid-glycerol binary solvent via a rapid ultraviolet light initiation. The introduction of gelatin as the second network endows the organohydrogel with desirable mechanical performance (high stretchability up to 1240%). The presence of phytic acid not only synergizes with glycerol to impart environment-tolerance to the organohydrogel (from −20 to 60 °C) but also increases the conductivity. Moreover, the organohydrogel demonstrates a durable adhesive performance toward diverse substrates, a high self-healing efficiency through heat treatment, and favorable optical transparency (transmittance of 90%). Furthermore, the organohydrogel achieves high sensitivity (gauge factor of 2.18 at 100% strain) and rapid response time (80 ms) and could detect both tiny (a low detection limit of 0.25% strain) and large deformations. Therefore, the assembled organohydrogel-based wearable sensors are capable of monitoring human joint motions, facial expression, and voice signals. This work proposes a facile route for multifunctional organohydrogel transducers and promises the practical application of flexible wearable electronics in complex scenarios.

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A tough hydrogel with fast self-healing and adhesive performance for wearable sensors

Cited by 13 publications

References 38 publications

Stretchable and Photothermal MXene/PAA Hydrogel in Strain Sensor for Wearable Human‐Machine Interaction Electronics

Stretchable and Photothermal MXene/PAA Hydrogel in Strain Sensor for Wearable Human‐Machine Interaction Electronics

Potential application of hydrogel to the diagnosis and treatment of multiple sclerosis

Stretchable Organohydrogel with Adhesion, Self-Healing, and Environment-Tolerance for Wearable Strain Sensors

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