REACTIVE & FUNCTIONAL POLYMERS
·
2018
·
IF 2.975
Wen Yang,Shengnan Wang,Ran Li,Jian Xu,Wentao Hao
A growing interest has been devoted to the mechano-responsive fluorescent polymers recently for their potential applications in mechanosensors, memory devices, security papers, etc. In this article, we demonstrated that hyperbranched poly(amido amine)s (HPAMAMs) are novel mechano-responsive fluorescent polymers. The fluorescence intensity of HPAMAM films sensitively increases as the films stretch, both for small and large strains. After the strain is released, the fluorescence intensity of HPAMAMs can quickly return to nearly original values. Moreover, the fluorescence intensity of HPAMAMs continuously changes when experiencing cyclic stretching and releasing. It is believed that this work provides a new insight for the research of mechano-responsive fluorescent polymers.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 35
·14656-14664
·
IF 3.5
Di Wen,Ruige Yuan,Fan Yang,Rong Chen
Wearable devices hold significant potential in healthcare and medical diagnostics. One major challenge in realizing this potential is the low barrier property of polymer substrates, which fail to withstand surrounding moisture and biofluids. In this work, a two-step strategy involving ALI followed by a UV-curing process is developed to fabricate a K48PDMS/Al2O3 ultra-barrier with high barrier property of 7.82 × 10−5 g m−2 day−1 under stretching strain, representing one of the highest values among current works. Moreover, the K48PDMS/Al2O3 barrier enables Ca-tested devices to exhibit extended operational lifetimes of up to 12 days in simulated rain. It also ensures the high sensitivity of strain sensors for real-time monitoring of health-related physiological signals, even when exposed to aggressive solutions such as PBS, KOH, and glucose. A clear “filling–cross-linking” mechanism is revealed, involving the filling of the void spaces within polymer chains followed by the cross-linking of polymer side chains to enhance the density of the hybrid layer. Adjusting porosity and functional group density ensures complete Al2O3 infiltration into the polymer. The cross-linking increases from 12.31% to 73.79% compared to the UV-curing process alone due to the presence of Al2O3, further enhancing the density of the hybrid layer and its barrier properties. The proposed strategy in our work shows great potential for providing highly reliable encapsulation for wearable electronics.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Keming Zhu,Lan Yang,Xing Zhou,Xuan Zhang,Yaya Hao,Fan Li,Wanqing Lei,Qi Wang,Guosheng Wang
Recycled waste plastics and their derivatives serve as crucial alternatives to traditional petroleum-based materials, offering a sustainable strategy for mitigating environmental pollution. In this work, we prepared waterborne polyurethane (WPU) with enhanced transparency, heat resistance, and mechanical properties by using the depolymerisation products (GOPs) as a chain extender from waste polyethylene terephthalate (PET) bottles. Additionally, we incorporate dihydroxyethyl disulfide (HEDS) with GOPs co-chain extender imparts significant self-healing capabilities, with strain and tensile strength healing rates of up to 82.57% and 93.72%, respectively. Furthermore, a composite membrane featuring a polypyrrole (PPy) core was further fabricated for flexible strain sensors, which demonstrated excellent dynamic responsiveness, signal stability, and electrical monitoring performance. These findings underscore the promising potential of upcycled waste plastics in the development of advanced materials for flexible electronics and packaging applications.
研究领域:
材料科学
·
环境科学
·
柔性电子
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Meng Li,Huaisuo Yao,Shunyu Yao,Gang Chen,Jingxue Sun
Lattice strain is a new strategy for promoting photocatalytic activity in order to source more sustainable energy. Vacancy-induced strain is an effective tactic for lattice deformation. Herein, a CdS/Bi 2 S 3 heterojunction structure containing sulfur vacancies (CdS/Bi 2 S 3 -V S ) is synthesized by a one-step solvothermal method. When there are sulfur vacancies in the Bi 2 S 3 lattice (Bi 2 S 3 -V S ), the surrounding atoms move toward sulfur vacancies. This phenomenon lengthens the bonds between surrounding atoms, resulting in tensile stress. Strain engineering adjusts the energy band structure to reduce the interface barrier height, thus effectively improving the interface charge transfer rate. Moreover, density functional theory (DFT) calculations explore the influence of different strain levels on the band structure and Gibbs free energy. The strain-regulated band structure provides a new approach and effectively reduce the interface barrier.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 13
·135501
·
IF 3.551
Guishan Wang,Peng Yang,Bailiang Chen,Guanjun Liu,Jing Qiu
A great deal of engineering effort is focused on developing stretchable strain sensors for human motion monitoring and wearable devices. The ultrasensitivity and fast response under tiny strain (1%) while maintaining the working range remain the grand challenge. In this work, we propose an entirely stretchable strain sensor based on the sandwich sensing film, which is fabricated by vacuum filtration of silver nanowires (AgNWs)/ graphene/ AgNWs in sequence and the injection of liquid metal as electrodes. The novel sandwich sensing film endows the stretchable strain sensor high sensitivity under tiny strain (Gauge factor = 111.5 at 1%), fast response (<10 ms), relative large working range (0%–35%) with a maximum gauge factor of 1403.7, followed by good linearity, long-term durability, and the recovery property from being overstretched (>100%). The excellent performance is due to the slippage of the inner graphene under tiny strain, whereas the 'sewing' phenomenon of the outer AgNWs under larger strain. The sandwich structure illustrates a better combination of graphene and AgNWs than other hybrid methods, showing great potential in wearable devices and soft robotics.
研究领域:
材料科学
·
柔性电子
·
传感器技术
✓ 已验证
DOI
高影响因子
ACS Applied Electronic Materials
·
2023
·
IF 4.7
Ya-Ru Ding,Rangtong Liu,Yan Zheng,Xue Wang,Yuanyuan Yu
Stretchable strain sensors have promising applications in flexible electronics field, such as artificial skin, health monitoring, and smart wearables. However, their anti-corrosion property, outstanding sensitivity, and environmental adaptability of strain sensors still remain a great challenge. Herein, a porous film was constructed by coating the stack of conductive fiber network with a 1H,1H,2H,2H-perfluorodecyltriethoxysilane array via molecular self-assembly, which formed a superhydrophobic surface on the conductive film. The conductive porous film demonstrated the superior water-resistance interface with a water contact angle of 179.5° and favorable conductive stability in humid environments. In addition, the film can also exhibit a strain sensitivity in the wide range of 0–100%, a rapid response of 150–200 ms, and excellent stability. Meanwhile, the superhydrophobic surface has made droplets easier to slip off its surface during stretching, and the fog also has rapidly coalesced into droplets on the film. The outstanding superhydrophobic surface was attributed to the stable sensing performance under the sweat condition, showing great potential in wearable sensors of stretchable, breathable, and water-resistant for human behavior monitoring.
研究领域:
材料科学
·
柔性电子学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Wei Li,Yin He,Jie Xu,Wen-yu Wang,Zheng-tao Zhu,Hao Liu
The silver nanowires (Ag NWs) prepared by improved polyol method in 30min were applied to the stretchable strain sensors. Three factors affecting the morphology of Ag NWs were discussed, including reaction temperature, molecular weight of PVP, ratio of silver nitrate (AgNO 3 ) and polyvinyl pyrrolidone (PVP). Experimental results showed that Ag NWs with diameter of 53 ± 9 nm, length of 31 ± 7 μm and the aspect ratio is 584.9 were obtained under the optimum conditions. Thus, a new and convenient method was proposed to fabricate flexible stretchable sensors by embed Ag NWs into Polydimethylsiloxane (PDMS). The stability, hysteresis, and sensitivity of the Ag NWs@PDMS strain sensors were evaluated by cyclic stretch-release test. Our strain sensor with good stability, higher sensitivity (the gauge factor is 4.11) and good repeatability could be stretched 10% continuously for about 200 cycles. Ag NWs@PDMS flexible sensors can be used in wearable devices to monitor human movements.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
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产品关联
DOI
高影响因子
Advanced Sustainable Systems
·
2021
·Vol. 6
·期 3
·2100382
·
IF 6.271
Tong Ji,Hao Sun,Boyu Cui,Yalan Li,Zechun Ren,Min Xu,Haiying Li,Daxin Liang
Conductive carbon materials have recently received increasing interest for their potential applications in wearable electronics and electronic skins because of their adjustable structure and resistance. However, high cost, large energy consumption, and potential biological toxicity put a huge obstacle in the way of practical application in electronics. Bio-derived carbon, which possesses sustainability and low cost, is an ideal substitute for traditional carbon materials. Here, a facile and eco-friendly strategy is proposed to fabricate a lamellar wood-derived carbon framework with excellent electrical conductivity for stretchable strain sensors. The obtained carbonized delignified wood framework (CDWF) possesses higher conductivity (5.62 S cm −1 ), and larger specific surface area (35.42 m 2 g −1 ) as compared with carbonized wood framework (CWF). Moreover, the CDWF can be utilized to assemble a stretchable strain sensor by encapsulating it into polydimethylsiloxane (PDMS). The CDWF-based sensor exhibits favorable stretchability, stability, and durability (5000 cycles). The outstanding sensing properties of the sensors enable it to measure the joint movement of the human body accurately and continuously, showing good prospects for human physical monitoring and wearable devices applications.
研究领域:
材料科学
·
生物工程
·
电子皮肤
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产品关联
DOI
高影响因子
Smart Materials and Structures
·
2021
·Vol. 31
·期 1
·015009
·
IF 3.585
Guishan Wang,Ying Liu,Fangsong Xu,Guanjun Liu,Jing Qiu
Multidirectional monitoring is highly expectable for stretchable strain sensors by which the randomly orientated cracks or the maximum strain of all directions need to be accommodated. Many current types of research exploit laminated sensors and rosette designs to obtain the desired behavior in several discrete directions. However, this can lead to complex fabricating and resolving processes, as well as significant measurement errors. Our work proposes an isotropic stretchable strain (ISS) sensor that utilizes the in-plane curved sensing film from graphene/silver nanowires (AgNWs), which exhibits uniform sensitivity in all directions within 30∘ and the potential extending to 360∘. The ISS sensor, whose curved shape is optimized based on splines and the quantitative sensing model, is fabricated by a flash stamp machine and followed by vacuum filtration. Experimental results show that the ISS sensor possesses equivalent sensing properties in 30∘ with excellent linearity and durability. Thus our customized sensor is applied to multidirectionally monitor the stretchable surface without consideration for the sensor orientation and the resolving process. Most importantly, the ISS sensor and its design method provide an efficient route for future sensor design with expected properties, not limited to isotropy.
研究领域:
材料科学
·
传感器技术
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DOI
高影响因子
ENERGY AND BUILDINGS
·
2023
·
IF 6.7
Yangjiu Zhao,Shaowei Shen,Xinya Wang,Ruirui Cao,Xiaoyong Jia,Xiling Niu,Haihui Liu,Xingxiang Zhang
Phase change materials (PCMs) can alleviate concerns about energy to a certain extent by reversibly storing a plenty of renewable and sustainable thermal energy. However, they do not have any flexibility due to their liquid leakage and solid rigidity, making them unsuitable for further practical wearable applications. Herein, a series of SEBS/ n -alkane PCM composite films (PCMFs) were fabricated. SEBS is mainly used as the supporting substrate to prevent the leakage of liquid n -alkanes and endue the PCMFs with excellent mechanical properties. Where, the tensile strain and tensile strength of SEBS/ n -HD-50% PCMF separately are 780% and 9.96 MPa, representing excellent stretchability and deformability, tailorability, and foldability. Particularly, the onset melting and crystallization temperatures ( T mo , T co ) of SEBS/ n -ES-50% and SEBS/ n -DS-50% PCMFs individually are 28.1 °C and 28.4 °C, 33.8 °C and 35.7 °C, which match the comfort zone for human skin and the ideal thermo-response temperature range of smart windows, and a range of experiments have verified their feasibility in the fields of thermal management, smart windows and infrared stealth. This study well solves the problems of liquid leakage and solid rigidity of PCMs themselves, endows them with excellent comprehensive performance, and greatly expanding the practical applications of PCMs.
研究领域:
材料科学
·
热工程
·
复合材料
·
能量存储
·
可穿戴技术
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Minglonghai Zhang,Yadie Yang,Huiming Hu,Shuaiquan Zhao,Wenfang Song,Nazmul Karim,Hong Hu
Wearable strain sensors play a pivotal role in real-time human motion detection and health monitoring. Traditional fabric-based strain sensors, typically with a positive Poisson’s ratio, face challenges in maintaining sensitivity and comfort during human motion due to conflicting resistance changes in different strain directions. In this work, high-performance stretchable strain sensors are developed based on graphene-modified auxetic fabrics (GMAF) for human motion detection in smart wearable devices. The proposed GMAF sensors, with a negative Poisson’s ratio achieved through commercially available warp-knitting technology, exhibit an 8-fold improvement in sensitivity compared to conventional plain fabric sensors. The unique auxetic fabric structure enhances sensitivity by synchronizing resistance changes in both wale and course directions. The GMAF sensors demonstrate excellent washability, showing only slight degradation in auxeticity and an acceptable increase in resistance after 10 standard wash cycles. The GMAF sensors maintain stability under different strain levels and various motion frequencies, emphasizing their dynamic performance. The sensors exhibit superior conformability to joint movements, which effectively monitor a full range of motions, including joint bending, sports activities, and subtle actions like coughing and swallowing. The research underscores a promising approach to achieve industrial-scale production of wearable sensors with improved performance and comfort through fabric structure design.
研究领域:
材料科学
·
生物医学工程
·
纺织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Mingzhe Li,Yunlong Wang,Chenxuan Xie,Xin Zhang,Fengchun Zheng,Yuzhen Lv,Nian Ran,Wei Zhou,Kepi Chen,Jin Zhang
Integrating strain engineering into the design and fabrication of large-area electrodes with highly efficient alkaline hydrogen evolution reaction (HER) performance is still a big challenge. Herein, a 6-meter-long CuNi/NiPt 1 % alloy cathode with excellent performance has been synthesized through epitaxial growth on the surface of microcone array using our self-developed roll-to-roll electrodeposition system. It delivers ultralow overpotentials of 58.2 ± 4.5 and 158.2 ± 11.2 mV at 100 and 1000 mA cm −2 , respectively, with a low Tafel slope of 28.5 mV dec −1 and an ultra-high mass activity of 64.7 mA μg Pt −1 @ 100 mV. It maintains 99 % activity retention after 2000-h operation at 1 A cm −2 and withstands harsh industrial conditions including high-frequency fluctuating load (20–120 %, 1/20 Hz, 100 h) and ultrasonic cavitation (40 kHz, 300 W, 1 h). Multi-scale characterizations reveal that a 2.5 % tensile strain is induced by 50 nm-thick NiPt 1 % alloy layers epitaxially grown on the CuNi alloy cone array. This tensile strain enhances the Volmer-Tafel kinetics by reducing activation energy by 26 % and increases surface *H coverage by 4.2-fold. DFT calculations further confirm it enables the transformation of non-spontaneous water dissociation into a spontaneous process, reducing the reaction’s energy barrier by 30 %. Additionally, *H adsorption across all surface sites of NiPt 1 % alloy is greatly enhanced, resulting in a reduction of 20 % in energy barrier for Tafel reaction. This work proposes a simple and scalable strategy for integrating strain engineering into alloy cathodes with excellent alkaline HER performance.
研究领域:
电化学
·
材料科学
·
纳米技术
·
能量转换
·
催化
·
化学工程
✓ 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）