Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 3
·1-14
·
IF 20.1
Liu Chunlin,Jiang Le,Yue Ouyang,Feng Yufan,Zeng Boxiang,Wu Yixian,Wang Yifan,Wang Jingyun,Zhao Lingyun,Wang Xiumei,Shao Changyou,Wu Qiong,Sun Xiaodan
Conductive hydrogels always suffer from weak mechanical capabilities, low adhesion, and lack of antifreeze performance, which seriously restrict their application in flexible wearable devices at low temperatures. To address these problems, a thermal enhancement strategy was creatively proposed to prepare PEDOT:PSS-gelatin-based (CHGP) hydrogels, which achieved excellent mechanical properties (tensile strength ≈ 7.38 MPa and strain ≈ 150%), good adhesion properties (adhesion strength ≈ 27.8 kPa), and the lowest freezing point (− 51.7 ℃) compared to other reported gelatin-based hydrogels. It was demonstrated that the data monitored by the CHGP-based multimodal sensors at − 25 ℃ and 25 ℃ have high consistency, which proved the sensors’ stability in sensing and monitoring highly sensitive strain and humidity. Furthermore, assembled with VHB tape, a self-powered triboelectric nanogenerator (C-TENG) was designed as a low-temperature monitoring sensor, which can monitor not only body or environment temperature but also human movement without being affected by humidity. C-TENG has the ability to monitor the vital signs and mobility of users at low temperatures to ensure the safety of outdoor workers. Therefore, this study provides a useful strategy for preparing antifreeze hydrogel-based flexible wearable devices with low-temperature monitoring functions.
研究领域:
材料科学
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纳米技术
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传感器
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生物医学工程
·
柔性电子学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Qian Wang,Qian Zhang,Guangyu Wang,Yuanrui Wang,Xiuyan Ren,Guanghui Gao
Hydrogel strain sensors have attracted tremendous attention in medical monitoring, flexible wearable devices, and human–machine interfaces. However, traditional hydrogels exhibit isotropic sensing performance based on their isotropic structure. Therefore, it is challenging to fabricate a hydrogel with an anisotropic structure similar to human tissues for achieving anisotropic sensing characteristics. Herein, we proposed a simple and effective method for preparing anisotropic poly(vinyl alcohol) (PVA) conductive hydrogels, which demonstrated anisotropic mechanical properties and anisotropic ion conductivity. The anisotropic hydrogel was successfully constructed through first thermal stretching and then directional freezing. The mechanical strength of hydrogels along the parallel stretching direction (stress of 1596 kPa and toughness of 3.69 MJ/m3) was higher than that of the hydrogels along the vertical stretching direction (stress of 883.1 kPa and toughness of 1.96 MJ/m3). Moreover, the hydrogel showed anisotropic conductivity on the advantage of the different ion channels. The prepared hydrogel sensor exhibited anisotropic sensing for multidirectional stress in the strain range from 0.5 to 100%. The gauge factors (GF) parallel to the stretching direction were greater than the GF vertical to the stretching direction. The anisotropic hydrogel sensors are expected to have broad application prospects in flexible wearable devices and medical monitoring.
研究领域:
材料科学
·
生物材料
·
生物医学工程
·
可穿戴技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Li Zhong,Zhaoji Dong,Yuanquan Liu,Chuchu Chen,Zhaoyang Xu
Anisotropic hydrogels have attracted extensive attention because they are similar to natural hydrogel-like materials and exhibit superiority and new functions that isotropic hydrogels cannot. Here, we fabricated strong and tough carboxymethyl cellulose-based conductive hydrogels with oriented hierarchical structures through pre-stretching, solvent displacement induced phase separation, and subsequent ionic crosslinking immobilization. Solvent displacement made the pre-stretched carboxymethyl cellulose-based polymer network more dense and linear, while the toughness of the hydrogel was further improved under the effect of phase separation. Strong and tough hydrogels were prepared by combining pre-stretching and phase separation; the variation range (tensile strength of 2.24–6.19 MPa and toughness of 19.41–22.92 MJ/m 3 ) can be adjusted by the stretching ratio. Compared with traditional carboxymethyl cellulose-based hydrogels, the tensile strength and toughness were increased by 49 times and 15 times, respectively. In addition, the hydrogels had good underwater stability, ion cross-linking made the hydrogels have good conductivity, and the directional stratification structure gave the hydrogels conductive anisotropy. These characteristics give hydrogel sensors broad application prospects in flexible wearable devices, anisotropic sensors, and intelligent underwater devices.
研究领域:
材料科学
·
高分子化学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Tao Song,Saihua Jiang,Nixin Cai,Guohua Chen
Flexible wearable devices based on triboelectric nanogenerators (TENGs) can be used to track many parameters around the human body, including signals from motions, gestures, and contacts, to perform a variety of tasks. However, it is still a challenge to achieve wide working temperature and multi-parameter body motion sensing with TENG sensors. To address that, this work reports a facile 3D printing-based strategy for preparing functionalized heat-resistant TENG sensors. In detail, a printable heat-resistant ink and multiple 3D printing-based assembly methods are proposed. The as-fabricated ink, which could maintain up to 200 ℃, then serves as multiple components in the TENG sensors through patterning. Functionalized TENG sensors and human–machine interfaces are printed and subsequently networked on a human body to sense comprehensive motion information. The results indicate six typical motions can be recognized with 94.85% accuracy based on neural network algorithms. A simple digital twin for motion capture and trace tracking in virtual space is furthermore implemented. Combining the proposed TENG sensors with virtual reality (VR) platforms opens up a new road for human safety monitoring in high-temperature environments.
研究领域:
材料科学
·
可穿戴技术
·
传感器技术
·
人工智能
·
虚拟现实
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Shuting Xie,Ri He,Qifan Zhu,Mingliang Jin,Ruizhi Yang,Shitao Shen,Jiayi Cui,Yiying Zou,Minmin Zhang,Lingling Shui
A sessile droplet array of 4’-pentyl-biphenyl-4-carboxylic acid (PBA) doped 5CB sessile droplets (12 −104 µm) is prepared by inkjet printing and applied for label-free sensing of penicillin G according to the configuration transition from axial to windmill based on the molecular alignment of 5CB at the LC-aqueous interface. Selective determination of penicillin G is achieved according to the target-selective enzymatic hydrolysis catalyzed by penicillinase, exhibiting sensitive detection and fast response with a detection limit of 0.178 ng/mL within 3–5 min. The sensitivity is linear depending on LC droplet size. Under the optimized conditions, the linear detection range is 1.78–178.0 ng/mL. Such a droplet array sensor has also been successfully applied to determine penicillin G in real river and lake water samples with RSD of 102–119%. Such a platform possesses the advantages of simple and cheap construction of an ordered array for multiplex sensing, and easy characterization via a polarizer . The quantification range of this proposed label-free optical penicillin G sensor covers the maximum residue limits in raw milk and river water defined in the European Union Regulation, and thus being applicable for food and environmental monitoring. By engineering LC-based probes, this approach could be extended to sense various molecules and ions in biomedical and chemical scenarios. And the sessile droplets on polymer substrates would also bring the possibility for employing in flexible and wearable devices in the future.
研究领域:
光学传感
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分析化学
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环境监测
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生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Wenyu Bai,Zhipeng Yong,Shuang Wang,Xiaodong Wang,Chenglong Li,Feng Pan,Dan Liang,Yinghe Cui,Zhe Wang
In this paper, MXene based electrode active materials and MXene cross-linked polyacrylic acid hydrogel electrolytes with high cycling performance and high specific capacitance have been successfully prepared. Polyaniline with high capacitance values has been grown on the MXene surface by in situ polymerization , which can significantly improve electrochemical properties. As the MXene surface is rich in functional groups, it can be used as a nucleation site for in situ polymerization of aniline monomers deposited. The PANI filled with MXene forms a 3D porous conductive network reducing the self-stacking of MXene and providing a large number of channels for electrolyte ions to enter MXene. The supercapacitor has been tested and assembled with good flexibility and the specific capacitance has risen to 222 F g −1 . The capacitance retention of 98.5 % after 10,000 charges and discharges is due to the improved performance of the composite material and the excellent stability of the gel electrolyte and electrodes. The above results show that the prepared electrodes and devices have promising applications in flexible wearable devices .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Li Zhong,Yuhui Zhang,Fei Liu,Luzhen Wang,Qian Feng,Chuchu Chen,Zhaoyang Xu
Conductive hydrogels are considered one of the most promising materials for preparing flexible sensors due to their flexible and extensible properties. However, conventional hydrogels' weak mechanical and isotropic properties are greatly limited in practical applications. Here, the internal structure of the hydrogel was regulated by pre-stretching synergistic ion crosslinking to construct a carboxymethyl cellulose-based double network-oriented hydrogel similar to muscle. The introduction of pre-stretching increased the tensile strength of the double-network hydrogel from 1.45 MPa to 4.32 MPa, and its light transmittance increased from 67.3 % to 84.5 %. In addition, the hydrogel's thermal stability and electrical conductivity were improved to a certain extent. Its good mechanical properties and conductive properties can be converted into stable electrical signal output during deformation. The carboxymethyl cellulose-based double network oriented hydrogels were further assembled as flexible substrates into flexible sensor devices. The hydrogel sensors can monitor simple joint movements as well as complex spatial movements, which makes them have potential application value in the research field of intelligent response electronic devices such as flexible wearables, intelligent strain sensing, and soft robots.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Chang Xu,Shiqiang Guan,Hao Zhang,Weiwang Fan,Xijing Zhuang,Xufeng Dong
Hydrogels are promising candidates for flexible wearable technology, biomedicine, and even brain–computer interfaces (BCI). However, the mismatch in the mechanical properties and high biotoxicity of the materials cast a shadow on their application prospects. Herein, we developed a multifunctional hydrogel matrix primarily based on the natural polymer gelatin. Multilevel hybrid dynamic crosslinking (MHC) enables the adjustment of the hydrogel molecular network and endows the material with satisfactory mechanical properties and self-healing behavior. The excellent biocompatibility of the hydrogel is enough to support the growth and proliferation of cells while avoiding tissue rejection or inflammation. Moreover, the excellent self-adhesive performance allows the hydrogel to directly adhere to the surface of human skin and tissues, enabling real-time monitoring of body movements and non-invasive sensing of electroencephalogram (EEG) signals. Therefore, the multifunctional hydrogel matrix with self-adhesive behavior, self-healing properties, appropriate mechanical performance, and excellent biocompatibility can be regarded as a promising platform for applications in flexible wearable devices, biomedical materials, and BCI devices.
研究领域:
材料科学
·
生物材料
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生物医学工程
·
可穿戴技术
·
神经科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2025
·
IF 2.3
Du Haiyan,Zhao Yifan,Zhang Nan,Shen Jun
The anti-freezing and water-resistant gels strain sensors have great potential applications in flexible wearable devices, underwater communication, and deep-sea exploration. However, the poor adhesion, high swelling, low stretchability, or decreased conductivity of most gels in water hinders the stable signal transmission of the strain sensors. In this work, multifunctional polyionic gels with anti-freezing, water resistance, high adhesion, and wireless strain sensing ability were prepared by the one-step ultraviolet (UV) initiated copolymerization of butyl acrylate (BA), acrylic acid (AA), and 1-allyl-3-octylimidazole tetrafluoroborate ([AOIM][BF 4 ]). The high-density ionic groups in the macromolecular chains of poly(1-allyl-3-octylimidazole tetrafluoroborate) (P[AOIM][BF 4 ]) endowed the gels with excellent conductivity, which made the gel strain sensors suitable for monitoring the human joint movements, speech recognition, and other strain sensing. Because polybutyl acrylate (PBA) and P[AOIM][BF 4 ] are hydrophobic polymers, water molecules are hardly dispersed into the gel matrix, and the gels could maintain good flexibility and conductivity underwater or at low temperature. The gel sensors were connected with the wireless signal transmission module, which monitored finger tapping underwater, speech recognition, and human joint movement at − 20 ℃. The anti-freezing and water-resistant properties depended on the P[AOIM][BF 4 ] content in the gels. The anti-freezing, water resistance, and high adhesion provide the polyionic gels with new application prospects in telemedicine health, underwater communications, etc. Using UV irradiation to copolymerize ionic liquid monomers with traditional monomers for preparing the polyionic gels is efficient, environmentally friendly, and free of solvents. The strategy to fabricate the multifunctional gels could be expanded to other functional soft matters. Graphical The multifunctional polyionic gels could be used for underwater communication, speech recognition, and wireless motion monitoring at − 20 ℃.
研究领域:
材料科学
·
高分子科学
·
传感器技术
·
柔性电子学
·
水下机器人
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Lele Liu,Zihao Ai,Xinyuan Zhang,Keyong Tang,Ying Pei
The polyaniline/cross-linked collagen sponge (PANI/CCS) was synthesized by polymerizing PANI onto the collagen skeleton using mesoscopic collagen fibrils (CFs) as building blocks, serving as a piezoresistive sensing material. The structure and morphology of PANI/CCS were characterized using scanning electron microscopy (SEM), Fourier infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and thermal analysis (TA). The mechanical properties of PANI/CCS could be controlled by adjusting the CFs content and polymerization conditions. PANI/CCS treated with pure water exhibited exceptional compressive elasticity under 1000 compression cycles, demonstrating a wide strain range (0–85 %), rapid response time (200 ms), recovery time (90 ms), and high sensitivity (6.72 at 40–50 % strain). The treatment of the ionic liquid further improved the elasticity and the strain sensing range (0–95 %). The presence of PANI nanoparticles and mesoscopic collagen fibrils imparted antibacterial properties, stability in solvents, and biodegradability to PANI/CCS. Utilizing PANI/CCS as a piezoresistive sensing material enabled monitoring human movement behavior through the assembled sensor, showing significant potential for flexible wearable devices.
研究领域:
材料科学
·
生物材料
·
传感器
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Zhe-Kun Xu,Xian-Jiang Song,Yan Qin,Peng-Fei Li,Xiao-Gang Chen,Yuan-Yuan Tang,Ren-Gen Xiong,Hui-Peng Lv
Ferroelectric crystals possess essential properties for a wide array of applications, while their inherent brittleness presents significant challenges in smart scenarios that demand high flexibility and customizable shapes. Herein, an aminoborane adduct ferroelectric molecular crystal, trimethylamine chloroborane (TMACB), is synthesized, showing room-temperature metal-like malleability and ductility. TMACB crystallizes in rhombohedral R 3 m space group at room temperature and undergoes structural phase transition to monoclinic Cc space group at 256 K. The compressive strain of TMACB single crystal can reach ≈94% before fracture, more than 16 times that of traditional inorganic ferroelectrics (less than 6% in general), and large ultimate tensile strain of 15.6% can also be achieved. Both polarization-electric field hysteresis loop and piezoresponse force microscopy characterizations have demonstrated ferroelectricity of TMACB, which is further firmly supported by density functional theory calculation. Moreover, compressed thin sheet of TMACB crystal maintains promising ferroelectric performance with a large polarization value of 23.9 microcoulomb per square centimeter, close to that of inorganic ferroelectric BaTiO 3 . The discovery breaks through the research paradigm of brittle ferroelectric materials and offers new insights into the exploration of highly deformable ferroelectric crystals for flexible wearable devices and adaptable sensor arrays in the future.
研究领域:
材料科学
·
铁电学
·
柔性电子学
·
晶体工程
·
功能材料
✓ 已验证
DOI
PubMed
高影响因子
POLYMER
·
2023
·
IF 4.6
Liang Liu,Yunxin Chen,Chunxia Zhao,Min Guo,Yuanpeng Wu,Yuntao Li,Dong Xiang,Hui Li,Li Wang,Xiaoyan Zhang
Traditional hydrogel-based strain sensors do not work well under water due to extreme swelling and poor adhesion to substrates in water-rich conditions. Inspired by the jellyfish tentacles, a super stretchable dual crosslinked hydrogel was prepared as a motion sensor underwater. The hydrogel contained a cationic surfactant , hexadecyl trimethyl ammonium bromide (CTAB), that crosslinked with hydrophobic lauryl methacrylate (LMA) units in an AA-LMA copolymer . Al 3+ ions also coordinated with carboxyl groups in PAA chains and amino groups on chitosan (CS) to form ionic crosslink points. The formed hydrogel exhibited excellent anti-swelling characteristics, superior tensile properties (≈3000%), and rapid self-healing performance. Due to the complementary effects of electrostatic interactions and dynamic chemical bond formation, the hydrogel efficiently and repeatably adhered to various biological tissues, such as hogskin and shrimp, in aquatic environments. Moreover, the hydrogel-based strain sensor showed high sensitivity (GF = 2.04) over a wide sensing range from 0 to 1000% strain with high stability in air and water. The prepared materials' unique performance further expands their application prospects in flexible wearable devices , anti-counterfeiting recognition, and other fields in environmental conditions.
研究领域:
材料科学
·
生物医学工程
·
可穿戴技术
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）