INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Jingfeng Liu,Yinghao Shang,Zhuzhu Shao,Xingang Liu,Chuhong Zhang
The piezoelectric energy harvester (PEH) has attracted huge attention as an eco-friendly way to harvest mechanical energy for self-powered system. Structural design is crucial for optimizing the energy conversion efficiency of PEHs, especially some specialized three-dimensional (3D) structures as theoretically predicted. However, there are few reports guiding from the simulation to the real construction of high performance PEHs, and it is usually difficult to use traditional processing methods to realize customized 3D designate structures. Herein, the fused deposition modeling (FDM) 3D printing technique is developed to architect four customized 3D PVDF PEHs, and the relationship between the designed structures and corresponding piezoelectric output performances are systematically studied by theoretical simulation. The results show that, with a decreased force-bearing area, the effective deformation of the PEHs along the vertical direction increases, resulting in an excellent piezoelectric output. Thus, the optimal 3D conus arrayed PEH shows the highest piezoelectric output voltage of 8.69 V and current of 90.8 nA, which is about 2.75 times higher than that of the cylinder arrayed one. Additionally, the conus arrayed PEH can fast charge a 1 μF capacitor to 2.5 V within 100 s. This work manifests 3D printing as a powerful tool to reconcile the simulation and architecting for 3D PEHs with enhanced output performance for futuristic self-powered systems.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2022
·
IF 6.465
Ying Xu,Kai Sheng,Hongyin Xu,Junfeng Li,Wei Wang
Recently, solar-driven interfacial distillation has rapidly developed into an effective technology for unconventional water treatment. Solar evaporator as the central part of the system was extensively investigated and achieved high light-to-heat efficiencies. However, the combination of interfacial evaporators and solar still in the application was rarely studied, and the phenomena inside the device during evaporation have yet to be revealed. Here, we designed an interfacial evaporator with a conical solar still unit to study the enhancement of water collection. The physical changes inside the device during natural solar irradiation were also revealed. In addition, the COMSOL Multiphysics as simulation software was applied to reveal the temperature variation of the system during solar motion. As a result, the condensate collection of the space-occupied 3D system is 2.5 times that of the plant system in the actual solar irradiation, which is even larger than the laboratory irradiation process. In addition to more solar energy absorption during the solar movement, the faster saturation of the humidity (more than 90%) due to the space occupation is also an important factor for the higher water collection capacity of the 3D system. This discovery would provide a reference for the design of the interfacial evaporator and evaporation device in the future and promote its practical application.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2021
·
IF 0
Yuan Zheng Luo,You Qi Wan,Wei Hong
In this paper, we developed a three-dimensional percolation model to investigate the effects of the concentration and morphology of CNTs (carbon nanotubes) on the electrical conductivity of the nanocomposites. In the model, we judged the connections between CNTs by range search algorithm based on KD-Tree structure. At the same time, DIJKSTRA-Melissa algorithm was applied to efficiently find all the conductive paths instead of finding conductive network in traditional methods. From the simulation results, CNTs with higher aspect ratio were easier to form the conductive network. In a certain range of CNT’s concentration, the relationship between the conductivity of the conductive network and the carbon nanotubes was basically consistent with the classical percolation theory. To verify our simulation model, the morphological, electrical properties of Carbon nanotubes (CNTs)/poly(dimethyl siloxane) (PDMS) nanocomposites with different aspect ratio (AR) of MWNTs were systematically studied. In conclusion, these unique advantageous properties could be exploited to suggest potential applications of artificial electronic skin.
研究领域:
材料科学
·
计算模拟
·
电子皮肤
✓ 已验证
DOI
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Junqing Ren,Pao Yang,Zhijian Peng,Xiuli Fu
Nowadays, microwave dielectric substrate materials have been extensively investigated to meet the requirements of rapid development in modern communications. Among them, the composites of ceramic powder filled polytetrafluoroethylene (PTFE) have been a hot topic. However, the compatibility and connectivity between the surface of ceramics and PTFE molecular chains in the samples are usually low. Herein novel PTFE based composites with different contents of Al 2 Mo 3 O 12 (20–60 wt%) modified by C 14 H 19 F 13 O 3 Si (F8261) coupling agent were designed and prepared. The coupling agent F8261 has been successfully grafted to the surface of Al 2 Mo 3 O 12 powders, effectively promoting the densification and dielectric properties of the composites. As the content of the modified Al 2 Mo 3 O 12 powders increases from 20 to 60 wt%, the ε r value increases from 3.4 to 4.2, and tanδ almost remains constant at the beginning and increases with much more Al 2 Mo 3 O 12 added. The Al 2 Mo 3 O 12 -PTFE composites filled with 30 wt% Al 2 Mo 3 O 12 present the optimal dielectric properties of ε r = 3.6 and tanδ = 0.0018 with a high density of 95.6%. In addition, the electromagnetic and multiphysic simulation of a 24 GHz substrate integrated waveguide filter on the basis of the 30 wt% Al 2 Mo 3 O 12 - 70 wt% PTFE composite was carried out. It was revealed that the filter presented high stability on the electrical parameters caused by self-heating and dimension deformation due to the good microwave dielectric , thermal and mechanical properties of the substrate. These results indicate that the as-prepared 30 wt% Al 2 Mo 3 O 12 - 70 wt% PTFE composite would be a promising candidate for high-performance microwave dielectric substrates.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Yihan Yin,Zhiyong Cao,Hongxia Gao,Teerawat Sema,Yanqing Na,Min Xiao,Zhiwu Liang,Paitoon Tontiwachwuthikul
A poly(tetrafluoroethylene) hollow-fiber membrane contactor was used for CO2 absorption in tertiary amine solutions. Several influential factors were studied including the flow rate, concentration, temperature, CO2 loading of the absorbent and CO2 partial pressure, and velocity of mixed gas. Based on the finite elemental analysis method, a two-dimensional steady-state mathematical model was established using COMSOL Multiphysics simulation software to calculate CO2 mass transfer flux (JCO2) and CO2 concentration distribution in the hollow-fiber membrane contactor under nonwetting and partial-wetting conditions. Results show that the mass transfer was severely reduced in the partially wet membrane, and the predicted JCO2 under 15% membrane wetting agreed well with the experimental value. In addition, a dimensionless equation was developed to predict the liquid phase, gas phase, and membrane phase mass transfer coefficients and JCO2. The calculated JCO2 values are in good agreement with the experimental values with an average absolute relative deviation (AARD) of 9.4%.
研究领域:
化学工程
·
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2023
·
IF 8.4
Jingyu Wang,Yongrou Zhang,Zuyue Lei,Junqi Wang,Yangming Zhao,Taolin Sun,Zhenyu Jiang,Licheng Zhou,Zejia Liu,Yiping Liu,Bao Yang,Liqun Tang
In surgical training and experimental research, brain tissues immersed in cerebrospinal fluid often exhibit complex deformation and strain rate effects that can compromise their reliability and stability. Therefore, it is essential to develop a high-fidelity human brain tissue simulant material that serves as a physical surrogate model to understand its mechanical behavior, such as traumatic brain injury (TBI). However, the existing simulant materials have failed to meet the required mechanical properties. This study presents a composite hydrogel consisting of both a rigid polysaccharides network (Sodium alginate and Pectin) and a flexible polyacrylamide network, exhibiting brain tissue-like mechanical properties under various solution environments and strain rates. The results show that nonlinear mechanical behavior and good similarity under various external environments (artificial cerebrospinal fluid, normal saline, deionized water, and air environments) and different strain rates (0.001 s −1 ,900 s −1 ,1700 s −1 ). By analyzing the experimental data and theoretical analysis, we examine the effects of complex environments on the mechanical behavior of composite hydrogel and porcine brain tissue. Given that the properties of human brain tissue resemble those of porcine brain tissue, our work has significant reference value in realizing surgical training and advancing related research in biomedical engineering.
研究领域:
生物医学工程
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材料科学
·
神经科学
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2021
·Vol. 13
·期 1
·1-16
·
IF 16.419
Song Yan,Yin Fuxing,Zhang Chengwei,Guo Weibing,Han Liying,Yuan Ye
Three-dimensional ordered mesoporous carbon spheres modified with ultrafine zinc oxide nanoparticles are successfully prepared.
The microwave absorbing performance of zinc oxide/carbon nanocomposites can be controlled through regulating ratio of zinc oxide nanoparticles.
Electromagnetic simulation of radar cross section on a complicated groove structure demonstrates the microwave absorbing ability of the carbon based nanocomposites.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Xuying Shen,Ke Ran,Benxia Zheng,Fengzhu Chen
Constructing porous structures is important for enhancing the impedance matching of carbon-based microwave absorbing materials (MAM) and achieving effective electromagnetic wave absorption. In this study, we prepared three-dimensional interconnected graphene nanocapsules (IGNCs) with a honeycomb-like structure using trisodium citrate dihydrate. During pyrolysis, sodium citrate dihydrate undergoes self-assembly and thermal polymerization, forming interconnected nanocapsules. The homogeneous distribution of Na 2 CO 3 serves as a template for this process. The IGNCs-700 demonstrated an effective absorption bandwidth (EAB) of 4.32 GHz, at a fill concentration of only 5 wt% and a matched thickness of 2.3 mm. Finally, Computer Simulation Technology (CST) simulation results further validate the radar microwave absorption capability of the IGNCs-700 under far-field conditions.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2025
·
IF 6.2
Haoxuan Dong,Menghan Chen,Songqi Shi,Zhenming Li,Wei Liu,Lingxiao Cao,Zhonghao Wang,Chuanke Liu,Zhizhu He
The safety performance of lithium-ion batteries is a key factor affecting the development of electric vehicles, among which safety hazards caused by mechanical stress have attracted much attention. Monitoring the contact pressure between lithium-ion batteries can provide more information about the state of health, while existing sensing devices have low integration and poor real-time performance. In this study, a capacitive pressure sensor with a micro-dome structure ionic gel dielectric layer is designed. Through multi-physics simulation analysis, the stress distribution characteristics and pressure response mechanism of the sensor are systematically revealed. The sensor exhibits a stepped sensitivity characteristic within a three-level pressure range, and has the advantages of high sensitivity, fast response (98 ms), and excellent durability (over 4000 compression cycles). It can be integrated into the gaps between battery cells without affecting module assembly and normal operation. Experimental verification shows that the sensor can effectively monitor the pressure changes of lithium-ion batteries under mechanical shock at different speeds and charge–discharge cycles at different rates. This study provides an innovative solution for lithium-ion battery safety monitoring.
研究领域:
储能技术
·
传感器技术
·
电化学
·
材料科学
·
汽车工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Junjie Pan,Xinji Li,Wei Xia,Hongjiao Qu,Jingjing Li,Cheng Jiang,Tao Wang,Jianping He
Low-dimensional carbon matrix magnetic nanocomposites exhibit expansive prospects as lightweight microwave absorbers due to their large specific surface area and multiple attenuation characteristics. The two-dimensional (2D) flaky MOF-derived porous nanocomposites are synthesized successfully by acid etching and subsequent thermal reduction. An in-depth study of composition and flaky porous structure shows that acid etching increases multiple interfaces and carbon defects, proving beneficial for improving multiple interfacial polarization and relaxation polarization loss. In addition, the generated ferromagnetic products (Ni 4 N, CoFe) are beneficial in improving the magnetic loss ability. More importantly, the multilayer impedance gradient design optimizes the impedance matching characteristic. As a result, the prepared bilayer absorbing coating exhibits excellent microwave absorption properties with an effective absorption bandwidth (EAB) of 6.32 GHz at a thickness of 2.5 mm with a filling amount less than 15 wt%. When the total thickness is 3 mm, it can exhibit the widest EAB of about 7.1 GHz and the minimum reflection loss ( RL min ) value of about −54.5 dB. The RCS simulation shows that the multilayer coatings exhibit good microwave scattering and absorption ability under different pitching angles, proving potential candidates for excellent microwave absorbers.
研究领域:
材料科学
·
电磁工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Haoran Bai,Shengyi Yang,Zhenhua Ge,Mingzhu Liu,Mingdong Hong,Ruomin Pang,Xinbing Song,Yurong Jiang,Bingsuo Zou,Libin Tang
Narrow bandgap colloidal quantum dots (CQDs) are ideal materials for realizing high-sensitivity infrared photodetectors. Their use is an effective way to improve the external quantum efficiency (EQE) by utilizing the photomultiplication (PM) effect to achieve highly sensitive photodetection. How to improve the device performance by photomultiplication is still the hot topic in this field. In this work, a simple method of inserting a gold nanoparticles (Au-NPs) film into the PbS QDs active layer to enhance light absorption for the PM-type photodetector ITO/ZnO/PbS/Au-NPs/PbS/P3HT/Ag is presented. In this case, Au-NPs act as the hole traps to induce the tunneling injection of external electrons. As a result, a high responsivity of 1088.86 A W−1 with a high EQE of 138 066% and a specific detectivity (D*) of 1.2 × 1014 Jones is observed from the PM-type photodetector ITO/ZnO(80 nm)/PbS(110 nm)/Au-NPs(4 nm)/PbS(110 nm)/P3HT(140 nm)/Ag under 0.2 μW cm−2 980 nm illumination at −1 V. Furthermore, the device configuration of the photodetector is optimized with the help of COMSOL simulation, and its maximum absorption reaches 91%. In addition, the feasibility of enhancing light absorption through the plasmonic effect has been confirmed by simulating the electric field distribution and carrier distribution within the photodetector.
研究领域:
光电子学
·
纳米技术
·
光子学
·
材料科学
·
半导体器件
✓ 已验证
产品关联
DOI
高影响因子
MEASUREMENT SCIENCE and TECHNOLOGY
·
2024
·Vol. 35
·期 4
·045109
·
IF 2.7
Xiaoming Wang,Zhilong Guo,Yifeng Huang,Longbo Xiong,Daojin Yao,Wentao Dong
Strong winds can make a bridge's cable-stayed cables produce violent vibrations, leading to fatigue of the cable-stayed cables and damaging the cable-stayed bridge's structure. Accurately and effectively obtaining data on the wind loads applied to the cable-stayed cables is important for assessing the cable-stayed cables' health. The existing sensing elements for detection include diffusion silicon piezoresistive sensor, strain gauge, and other rigid sensors. However, most of them present such disadvantages as rigidity, difficult to fit the curved surface, high cost and low sensitivity. And it cannot be directly installed on the surface of the cable. In this paper, a conductive hydrogel flexible pressure sensor based on TA/CB@PDMS was developed, using carbon black (CB) as the main conductive medium, with good electrical conductivity, high sensitivity (0.65 kPa−1) and excellent tensile properties (210% tensile breakage). Meanwhile, a salt permeation method (Soak the sensor in LiBr solution) was used to effectively inhibit the sensor's water from being evaporated and frozen. Its substrate incorporates tannic acid to increase the sensor's adhesion so that it adheres well to the diagonal cable's surface. In this paper, the wind speed variation around the diagonal cable and the force distribution on the surface with considering the fluid-structure coupling effect are analyzed by ANSYS WORKBECH finite element simulation. Wind tunnel experiments simulate the sensor's force response when the inclined cable is subjected to different wind speeds, and the detection accuracy reaches 96.17%. The results show the sensor developed in this paper can realize accurate wind pressure detection of the inclined cable. This study provides a new method for wind pressure detection and health inspection of diagonal cables.
研究领域:
土木工程
·
材料科学
·
传感技术
·
结构健康监测
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）