SENSORS
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2022
·Vol. 23
·期 1
·91
·
IF 3.847
Yanlu Chen,Xinxin Pu,Xinyu Xu,Menghan Shi,Hui-Jun Li,Ding Wang
The traditional self-supported piezoelectric thin films prepared by filtration methods are limited in practical applications due to their poor tensile properties. The strategy of using flexible polyethylene terephthalate (PET) fabric as the flexible substrate is beneficial to enhancing the flexibility and stretchability of the flexible device, thus extending the applications of pressure sensors. In this work, a novel wearable pressure sensor is prepared, of which uniform and dense ZnO nanoarray-coated PET fabrics are covered by a two-dimensional MXene nanosheet. The ternary structure incorporates the advantages of the three components including the superior piezoelectric properties of ZnO nanorod arrays, the excellent flexibility of the PET substrate, and the outstanding conductivity of MXene, resulting in a novel wearable sensor with excellent pressure-sensitive properties. The PET/ZnO@MXene pressure sensor exhibits excellent sensing performance (S = 53.22 kPa−1), fast response/recovery speeds (150 ms and 100 ms), and superior flexural stability (over 30 cycles at 5% strain). The composite fabric also shows high sensitivity in both motion monitoring and physiological signal detection (e.g., device bending, elbow bending, finger bending, wrist pulse peaks, and sound signal discrimination). These findings provide insight into composite fabric-based pressure-sensitive materials, demonstrating the great significance and promising prospects in the field of flexible pressure sensing.Keywords:flexible pressure sensors;MXene;pressure-sensitive;ZnO nanoarrays
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
ACS ES&T Engineering
·
2024
·
IF 7.4
Dejun Feng,Shaodan Xie,Wenting Zhou,Yuanmiaoliang Chen,Zhangxin Wang
Membrane wetting is a prominent challenge in the practical applications of membrane distillation (MD). In this study, we hypothesize that increasing the hydraulic pressure on the distillate side (Pd) can mitigate membrane wetting, an operation mode we refer to as pressurizing distillate membrane distillation (PDMD). To implement PDMD, an accurate measurement of the liquid entry pressure (LEP) of the membrane with the feed solution is essential. However, the conventional LEP measurement method struggles with solutions containing amphiphilic agents. Herein, we develop an impedance-based LEP measurement method and validate it by measuring the LEPs of a commercial poly(tetrafluoroethylene) (PTFE) membrane with ethanol–water mixtures. Further, we demonstrate that this method can accurately measure the LEPs of the PTFE membrane with solutions containing sodium dodecyl sulfate (i.e., a representative amphiphilic agent) by capturing the subtle changes of the feed solutions within the membrane. Additionally, we show that PDMD can effectively mitigate membrane wetting induced by various wetting agents, as the elevated Pd results in a transmembrane hydraulic pressure lower than the LEP of the membrane. Overall, our study provides an effective wetting mitigation approach that can be easily applied in practical MD and membrane contactor applications.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Haogang Zhao,Haozhe Yi,Chunying Zhu,Taotao Fu,Youguang Ma
The adsorption process of deionized water droplets on the parallel flow interface between ionic liquid [BMIM][PF6] and mineral oil is investigated in U-shaped microchannels. Three flow patterns of the efficient adsorption, moderate adsorption, and inefficient adsorption based on the adsorption efficiency were observed. The dimensionless droplet length D / W > 0.72 is conducive to efficient adsorption of droplets. When droplet shape factor β > 1, the lubrication pressure generated within the curved liquid film has a more significant hindrance on the adsorption process, and the reverse lubrication pressure at the outlet of the liquid film is the main reason for the rupture of the liquid film. An increase in the velocity of phase interface A-B movement can lead to an increase in lubrication pressure. A correlation model is established between the dimensionless adsorption length L * and the dimensionless adsorption time t *, and the influence of Laplace pressure is analyzed.
研究领域:
化学工程
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流体力学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xinguo Qiu,Zhe Yang,Huaping Wu,Jing Guo,Zheng Zhang,Jie Feng,Guozhong Chai,Aiping Liu
With the increase of oily wastewater, the improvement of separation efficiency for oil-water emulsion under external pressure is an urgent task to resolve. As an important indicator for the separation result, the separation efficiency is affected by the wetting transition and external pressure. In this contribution, we built a model of hierarchical mesh structure and analyzed the effect of the space of mesh microstructure and the solid fraction of mesh nanostructure on energy barrier and critical pressure, which was further confirmed by experiment. The influences of external pressure on separation efficiency were also investigated experimentally, verifying the reasonability of critical pressure. This work provides guidance for designing and choosing the mesh structure applied in the separation of oil-water mixture under external pressure to get an excellent process efficiency and separation efficiency.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2018
·Vol. 34
·期 1
·95-100
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IF 1.248
Fu Xianwei,Liu Yang,Liu Zhi,Dong Ning,Zhao Tianyu,Zhao Dan,Lian Gang,Wang Qilong,Cui Deliang
Although organic semiconductors have attracted extensive interest and been utilized to fabricate a variety of optoelectronic devices, their electrical transportation characteristics under high pressure have rarely been investigated. However, the weak intermolecular interaction of organic semiconductors endows them with a pressure-sensitive crystal structure and electrical transportation performance, especially the latter. Herein, a new pressure-sensitive transistor was fabricated from an organic semiconductor 1,1′-dibutyl-4,4′-bipyridinium diiodide. It was found that this transistor exhibited increasing resistance as the pressure gradually increased and that it eventually shut off under a pressure of 288 MPa. Such a characteristic makes this organic semiconductor a potential candidate for the use in the fabrication of pressure-sensitive switches and regulators. In addition, these results shed light on the electrical performance of flexible organic optoelectronic devices working under high pressure levels resulted from the bending force.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Nanoscale Horizons
·
2019
·Vol. 5
·期 3
·541-552
·
IF 9.095
Congyi Wu,Tian Zhang,Jian Zhang,Jin Huang,Xing Tang,Tingting Zhou,Youmin Rong,Yu Huang,Songxin Shi,Dawen Zeng
Flexible tactile sensors that imitate the skin tactile system have attracted extensive research interest due to their potential applications in medical diagnosis, intelligent robots and so on. However, it is still a great challenge to date to fabricate tactile sensors with both high sensitivity and wide detection range due to the difficulties in modulating the resistance variation in the sensing materials in a wide pressure range. Here, a tactile sensor with a novel design based on the hierarchical pressure-peak effect (HPPE) consisting of PVP nanowires and electroless deposition (ELD) silver PDMS micro-pyramids is reported. The HPPE can effectively modulate the resistance change rate by adjusting the change of contact area during compression deformation, and the HPPE tactile sensor was demonstrated to have both ultrahigh sensitivity (11.60–1108.75 kPa−1) and ultrawide pressure range (0.04–600 kPa). The designed HPPE tactile sensor is successfully utilized in detecting multi-level pressures including respiration, finger heart rate, pulse and foot pressures. Moreover, it is used to sense a subtle clamping force in the Leonardo Da Vinci surgical robot demonstrating the potential of the sensor in surgical robot applications. In all these cases, the sensor exhibits enough capability to respond quickly to ultrawide-range pressures with high accuracy and stability.
研究领域:
材料科学
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生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-9
·
IF 14.919
Wang Xiu-man,Tao Lu-qi,Yuan Min,Wang Ze-ping,Yu Jiabing,Xie Dingli,Luo Feng,Chen Xianping,Wong ChingPing
Sensitivity and pressure range are two significant parameters of pressure sensors. Existing pressure sensors have difficulty achieving both high sensitivity and a wide pressure range. Therefore, we propose a new pressure sensor with a ternary nanocomposite Fe 2 O 3 /C@SnO 2 . The sea urchin-like Fe 2 O 3 structure promotes signal transduction and protects Fe 2 O 3 needles from mechanical breaking, while the acetylene carbon black improves the conductivity of Fe 2 O 3 . Moreover, one part of the SnO 2 nanoparticles adheres to the surfaces of Fe 2 O 3 needles and forms Fe 2 O 3 /SnO 2 heterostructures, while its other part disperses into the carbon layer to form SnO 2 @C structure. Collectively, the synergistic effects of the three structures (Fe 2 O 3 /C, Fe 2 O 3 /SnO 2 and SnO 2 @C) improves on the limited pressure response range of a single structure. The experimental results demonstrate that the Fe 2 O 3 /C@SnO 2 pressure sensor exhibits high sensitivity (680 kPa −1 ), fast response (10 ms), broad range (up to 150 kPa), and good reproducibility (over 3500 cycles under a pressure of 110 kPa), implying that the new pressure sensor has wide application prospects especially in wearable electronic devices and health monitoring.
研究领域:
材料科学
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电子工程
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纳米技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Lingxiao Lv,Panpan Zhang,Tong Xu,Liangti Qu
Herein, we develop a supersensitive pressure sensor based on a fully air-bubbled ultralight graphene block through a simple sparkling strategy. The obtained sparkling graphene block (SGB) exhibits excellent elasticity even at 95% compressive strain and rebounds a steel ball with an ultrafast recovery speed (∼1085 mm s–1). Particularly, the SGB-based sensor reveals a record pressure sensitivity of 229.8 kPa–1, much higher than other graphene materials, because of the highly cavity-branched internal structure. Impressively, the pressure sensor can detect the extremely gentle pressures even beyond the real human skin and hence are promising for ultrasensitive sensing applications.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2025
·
IF 9.4
Delin Lyu,Xuanjie Cui,Yuanqing Qu,Zhengyang Liu,Xiangning Liu,Zhen Huang,Dong Han
Increasing the compression ratio in spark-ignition (SI) engines improves thermal efficiency but raises knock risk. Knock resistance is measured by Research Octane Number (RON) in Cooperative Fuel Research (CFR) engines under standard conditions, which differ from modern SI engines. The CFR engine's knock sensor, fitted with a low-pass filter, fails to accurately detect high-frequency knock oscillations, making conventional RON inadequate for assessing knock resistance in modern engines. To address this, the CFR engine was modified by replacing the knock sensor with a cylinder pressure sensor for direct combustion pressure measurement and upgrading the carburetor to electronic fuel injection. Under stoichiometric conditions, the Maximum Amplitude of Pressure Oscillation (MAPO) and Integral of Modulus of the Pressure Oscillation (IMPO) methods were applied to evaluate PRF blends with RONs of 88–100. Strong correlations were observed between the fuels RON and both IMPO and MAPO measurements, with coefficients of determination of 0.98 and 0.99, respectively. This study also analyzed error sources and quantified measurement inaccuracies in both methods, with IMPO showing lower absolute error of RON and variability. To verify the reliability of the IMPO and MAPO methods in evaluating high-octane fuels, particularly those with RON >100, these methods were applied to test TRFs and oxygenated fuel blends with RONs of 94–108. Results showed deviations from conventional measurements; however, for fuels with RON >100, both methods effectively distinguished fuel knock resistance capacity. Additionally, IMPO and MAPO captured the knock resistance improvements for the addition of ethanol and 2-MF in gasoline blends.
研究领域:
机械工程
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汽车工程
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燃料技术
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燃烧分析
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Fiber Materials
·
2024
·Vol. 6
·期 3
·841-851
·
IF 17.2
Zhang Shijin,Yin Xia,Yan Pengxiang,Liu Yuanyuan,Qi Xiangjun,Zhang Xuming,Huang Tao,Xu Lianlong,Du Xianjing,Na Na,Mao Yongjun,Hu Song,Liu Hong,Tian Mingwei
Real-time monitoring of pressure and temperature in wheelchair patients is an effective method for preventing and rehabilitating pressure injuries. Nevertheless, few rehabilitation devices capable of monitoring temperature and pressure have been reported. Herein, we propose a fully textile-based scalable and designable dual-mode rehabilitation cushion for real-time monitoring of pressure and temperature. The different signal output modes (resistive and capacitive signals) enable noninterference between pressure and temperature. The cushion exhibits a wide pressure monitoring range of 2–160 kPa, a high sensitivity of 8.8399 kPa −1 , and a repeatable stability exceeding 10,000 cycles. In addition, the cushion demonstrates excellent temperature responsiveness with a linearity of 0.995 and a TCR of 0.019 s°C −1 . Furthermore, an intelligent monitoring system integrated with machine learning has been developed to realize large-range multipoint sensing and data visualization. The system can accurately recognize different sitting postures with an accuracy of 99.65%. Human application evaluations have demonstrated the feasibility of this cushion for preventing pressure injuries, which can stimulate further research on pressure injury prevention and rehabilitation in the future. Graphical Abstract
研究领域:
生物医学工程
·
康复医学
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产品关联
DOI
高影响因子
LANGMUIR
·
2015
·
IF 4.457
Zhou Liu,Xiangyu Fu,Bernard P. Binks,Ho Cheung Shum
In this work, we have devised a new approach to measure the critical pressure that a liquid marble can withstand. A liquid marble is gradually squeezed under a mechanical compression applied by two parallel plates. It ruptures at a sufficiently large applied pressure. Combining the force measurement and the high-speed imaging, we can determine the critical pressure that ruptures the liquid marble. This critical pressure, which reflects the mechanical robustness of liquid marbles, depends on the type and size of the stabilizing particles as well as the chemical nature of the liquid droplet. By investigating the surface of the liquid marble, we attribute its rupture under the critical pressure to the low surface coverage of particles when highly stretched. Moreover, the applied pressure can be reflected by the inner Laplace pressure of the liquid marble considering the squeezing test is a quasi-static process. By analyzing the Laplace pressure upon rupture of the liquid marble, we predict the dependence of the critical pressure on the size of the liquid marble, which agrees well with experimental results.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 29
·18089-18095
·
IF 10.7
Yuxing Tang,Qing Dang,Wei Zhang,Haiquan Guo,Hong Pan,Yong Xiang,Bin Liao,Xiaoran Hu
Pressure sensors provide significant information for monitoring and exploration of complex underwater environments. Current sensing technology of underwater pressure has certain limitations in the integration of individual sensors and decoupling of dynamic and static mechanical signals. In this paper, a polyester-based piezoelectric elastomer was synthesized and blended with modified nanocarbon fiber (DPBPE) to prepare a piezoelectric/capacitive composite, achieving integrated and synchronous identification of dynamic and static pressures. The incorporation of modified nanocarbon fiber into the piezoelectric elastomer ensures the piezoelectric and capacitive response of the composites and improves the relative capacitance change rate by 1.6 times compared to that of the neat elastomer. The prepared sensor shows a high sensitivity of 0.8 mV N−1 and 3.09 × 10−2 kPa−1 for dynamic and static pressure monitoring, respectively. Furthermore, the sensor showed good feedback for changes in water depth and underwater vibration without any mutual interference, indicating its great potential in fields such as ocean waves and underwater pressure monitoring.
研究领域:
材料科学
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传感器技术
·
海洋工程
✓ 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）