Article
Acoustics
Christopher Hakoda, Cristian Pantea, Vamshi Krishna Chillara
Summary: The paper presents a simple method for designing localized regions with minimal SAW amplitude, achieved by controlling the beat phenomenon. These regions can have variable widths and be positioned consecutively. The efficacy of the proposed method for SAW wave propagation is demonstrated through supplementary simulations.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Acoustics
Beomseok Cha, Song Ha Lee, Syed Atif Iqrar, Hee-Gyeong Yi, Jangho Kim, Jinsoo Park
Summary: In this study, a vertical-type ultrasonic SAW-based microfluidic mixer was proposed for rapid flow mixing with improved efficiency and controllability. Computational fluid dynamics simulations and experimental investigations were conducted to elucidate the acousto-hydrodynamic phenomenon of the vertical-type SAW-induced ASF. The SAW-induced vortices acted as a hydrodynamic barrier for controlled flow mixing, and proof-of-concept application demonstrated rapid red blood cell lysis with high efficiency based on the physical interactions with the SAW-induced acoustic vortical flows.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Acoustics
Zaiwei Liu, Bin Lin, Xiaohu Liang, Anyao Du
Summary: The study reveals the significant effects of residual stress and surface damage on surface acoustic wave propagation, with residual stress causing only a slight decrease in surface wave velocity and surface damage having a significant impact on the dispersion curve.
Article
Mechanics
Ziemowit Malecha
Summary: The article presents a three-dimensional numerical study of large-amplitude, acoustically driven streaming flow in rectangular resonators. The research investigates the impact of acoustic wave frequencies and temperature differences on the flow. The study reveals stationary streaming vortices in the resonator with a characteristic three-dimensional structure, and the relationship between streaming intensity and acoustic wave frequency is not trivial.
FLUID DYNAMICS RESEARCH
(2023)
Article
Materials Science, Characterization & Testing
L. Xiang, S. Dixon, C. B. Thring, Z. Li, R. S. Edwards
Summary: This paper investigates the waveform distortion of electromagnetic acoustic transducers (EMATs) as the lift-off distance increases. It demonstrates the impact of induced current spatial distribution on ultrasound pulses. The study also explores the influence of coil spacing on lift-off behavior in EMATs with an array configuration.
NDT & E INTERNATIONAL
(2022)
Article
Mechanics
Mehdi H. Biroun, Mohammad Rahmati, Mehdi Jangi, Baixin Chen, Yong Qing Fu
Summary: Surface acoustic wave (SAW) based technologies have been explored for sensing and microfluidic applications, but the large deformation of droplet interface actuated by SAWs has not been widely studied. In this paper, a computational interface tracking method is developed to simulate the interactions between liquid and acoustic waves. By analyzing energy terms within the liquid medium, it was found that two perfectly aligned interdigital transducers (IDTs) are optimal for mixing applications, while two offset IDTs are optimal for concentration and separation applications.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Acoustics
Yuting Liu, Xiandong Liu, Yingchun Shan, Xiaojun Hu, Jiajing Yi
Summary: This article investigates the acoustic cavity resonance inside the tire-wheel assembly and clarifies its characteristics and producing mechanism through methods such as finite element modeling and simulation. The results show that the slope change of the resonance frequency as a function of rotation speed is close to the reciprocal of tire radius, providing insights for controlling resonance energy and improving driving comfort.
JOURNAL OF VIBRATION AND CONTROL
(2021)
Article
Chemistry, Analytical
Umar Farooq, Xiufang Liu, Wei Zhou, Muhammad Hassan, Lili Niu, Long Meng
Summary: This method utilizes the collision between nanowires and cells to induce cell lysis efficiently, with advantages of low power consumption, fast processing, reusability, and minimal sample consumption. Ni coated Ag-nanowires show promise for applications in point of care diagnostics.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Nanoscience & Nanotechnology
Liqiang Li, Kun Jia, Ke-ji Yang
Summary: This study experimentally and numerically investigates the buildup of acoustic and streaming fields in microfluidics using surface acoustic waves (SAWs). The results show that the buildup time of the acoustic field is N times the acoustic period, while the buildup of the streaming field is an acoustic momentum diffusion process. The geometric shape of the microchannel determines the characteristic size of the flow.
MICROFLUIDICS AND NANOFLUIDICS
(2022)
Article
Energy & Fuels
Blazej Baran, Krystian Machaj, Ziemowit Malecha, Krzysztof Tomczuk
Summary: This article presents a numerical study on the large-amplitude, acoustically-driven streaming flow under different frequencies of the acoustic wave and temperature gradients. The research confirms that baroclinic acoustic streaming flow is largely independent of frequency, and its intensity increases with the temperature gradient between the hot and cold surfaces. Additionally, slight maximum values are observed at certain oscillation frequencies.
Article
Physics, Applied
Yang Yang, Yahui Ji, Chenye Zhang, Tianxiang Nan
Summary: In this study, the effect of surface acoustic waves (SAWs) on the motion of magnetic skyrmions is investigated using micromagnetic simulations. Different types and directions of SAWs generate different magnetoelastic effective fields, leading to the movement of skyrmions. Increasing the amplitude and magnetoelastic coupling constants of the acoustic wave, as well as reducing the wavelength, enhances the skyrmion motion velocity. The trajectory of skyrmion motion can be controlled through the design of the magnetic film geometry. Interestingly, in a circular magnetic film, skyrmions driven by SH waves exhibit clockwise or counterclockwise movement depending on the sign of topological charges. These results provide an energy efficient approach for driving skyrmion dynamics and have implications for low-power spintronics.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Engineering, Mechanical
Ning Jia, Zhilong Peng, Jianjun Li, Yin Yao, Shaohua Chen
Summary: This study investigates the dispersion phenomenon of Rayleigh waves when propagating on an elastic half space, revealing the effects of surface energy density and surface inertia on wave speed. Two intrinsic nano-length scales are identified, indicating that when the wavelength is comparable to these scales, the surface effect becomes significant, leading to dispersion of Rayleigh waves.
ACTA MECHANICA SINICA
(2021)
Article
Mechanics
D. A. Gubaidullin, P. P. Osipov, R. R. Nasyrov
Summary: This study investigates the flow of a viscous compressible gas in a closed rectangular resonator induced by harmonic oscillations of its boundary, revealing the existence of four Rayleigh vortices and four Schlichting vortices. The results show that as the channel width decreases, the dimensions of Schlichting vortices increase while Rayleigh vortices disappear. The influence of different means of standing wave generation on the acoustic streaming pattern is found to be weak.
Article
Engineering, Biomedical
Yufeng Zhou
Summary: Acoustofluidics in microchannels has been widely studied and applied in recent years. This study focuses on the effects of geometry on the acoustofluidics induced by bulk acoustic waves. By adding protrusions to the top or bottom wall of the microchannel, the acoustic streaming can be enhanced. The geometry of the microchannel has a significant impact on the trajectory of microparticles and the critical particle size.
BIOMEDICAL MICRODEVICES
(2022)
Article
Engineering, Electrical & Electronic
Jitender Kumar, A. T. Nimal, Upendra Mittal, Vinod Kumar, Vinay Kumar Singh
Summary: This article discusses a novel study on enhancing the sensitivity of a Surface Acoustic Wave (SAW) device used as a Gas Chromatographic (GC) detector by using a proper carrier gas. The research shows that using different carrier gases can increase the sensitivity by more than two times. By combining GC with SAW detector, excellent selectivity, repeatability, and long-term stability are achieved.
IEEE SENSORS JOURNAL
(2022)
Article
Physics, Applied
Ziyu Xing, Haibao Lu, Denvid Lau, Yong-Qing Fu
Summary: In this study, an extended potential well model is formulated to investigate the host-guest chemistry and the free-energy trap effect in double-network (DN) hydrogels undergoing mechanochemical toughening. A free-energy equation is proposed to describe the working principles of the mechanochemical coupling and toughening mechanisms using the depth, width, and trap number of potential wells. The effectiveness of the proposed model is verified using finite-element analysis (FEA) and experimental results of various DN hydrogels.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Review
Engineering, Environmental
Hui Chen, Fengling Zhuo, Jian Zhou, Ying Liu, Jinbo Zhang, Shurong Dong, Xuqing Liu, Ahmed Elmarakbi, Huigao Duan, Yongqing Fu
Summary: Flexible and wearable electronics have attracted significant attention in research due to their potential applications in personal healthcare, electronic skins, and human-machine interfaces. Strain sensors, especially those based on two-dimensional carbon-based materials such as graphene, play a crucial role in wearable electronics by efficiently converting external stimuli into electrical signals. This review highlights the need for a comprehensive overview of graphene-based strain sensors that focuses on their attributes, mechanisms, fabrication strategies, and applications in various fields.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Yihao Guo, Changshuai Yin, Jian Zhou, Zhangbin Ji, Fengling Zhuo, Hui Ling Ong, Jikai Zhang, Huigao Duan, Richard Fu
Summary: UV detectors based on SAW technology have the advantage of remote operation and zero power consumption. The frequency shift in SAW devices induced by UV irradiation is mainly caused by acoustoelectric and thermal effects, with minor influences from mass-loading and photo-capacitive effects. This study systematically investigates the contributions of acoustoelectric and thermal effects at different UV light intensities and clarifies their individual influences on SAW-based UV sensing under different conditions.
IEEE SENSORS JOURNAL
(2023)
Review
Engineering, Electrical & Electronic
Pingsheng Xue, Qiang Liu, Shuncheng Lu, Yongwei Xia, Qiang Wu, Yongqing Fu
Summary: This review introduces the fabrication methods, transmission mechanisms, and application examples of microstructured optical fibers. Sensing is highlighted as one of the common applications, and the examples of strain/pressure/bending/twist, temperature, flow rate, electric/magnetic field, humidity, gas, refractive index, and chemical/biochemical analyte sensing are discussed based on various principles. The state of the art, developing trends, and challenges faced by sensing technology based on microstructured optical fibers are also discussed.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Ziyu Xing, Haibao Lu, Yong-Qing Fu
Summary: Understanding the mechanical behavior and toughening mechanisms of soft elastomers is a challenge due to their scaling effects. In this study, a Kelvin model is developed to investigate the properties of elastomers undergoing scaling effects. The model incorporates Sierpinski fractal and scaling theory to explain the diffusion and relaxation behaviors of molecular segments. The effectiveness of the model is verified through finite-element analysis and experimental results, providing insights into the toughening mechanisms of elastomers.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Acoustics
Fangda Wu, Hanlin Wang, Chao Sun, Fan Yuan, Zhihua Xie, Roman Mikhaylov, Zhenlin Wu, Minghong Shen, Jian Yang, Will Evans, YongQing Fu, Liangfei Tian, Xin Yang
Summary: Recently, there has been increasing interest in the use of surface acoustic wave (SAW) based acoustofluidic separation for microparticles and cells due to their accuracy and biocompatibility. This study develops an acoustophoretic system using SAW based interdigital electrode devices, with power meters employed to monitor the incident and reflected powers. The study provides theoretical analysis and experimental results to determine the proper input power for separating mixtures of different-sized microspheres, offering practical guidance for bioparticle separation using SAW devices.
Article
Materials Science, Multidisciplinary
Fuxing Yao, Wenge Chen, Yana Yang, Longlong Dong, Ahmed Elmarakbi, Yong-Qing Fu
Summary: Tungsten network reinforced functionally graded copper composites were prepared using an integrated 3D printing and infiltration technology to improve high temperature ablation properties of nuclear fusion divertor materials. The composites' ablation behavior was systematically investigated using an argon arc welding torch. Results showed that mass loss of composites was increased firstly but then decreased with the increase of ablation time. During ablation, evaporation of the melted copper reduces the local temperature of tungsten skeleton, whose high melting point also restrict the further evaporation of copper. These mechanisms significantly improve the ablative resistance of CuW gradient composite. Tungsten twinning structures were identified to form during ultra-high temperature (at 6273.15 K) ablation process in a cold environment in air. The formation of distinctive W twinning structures and gradient distribution of copper and tungsten skeleton were identified as the key mechanisms for the significantly enhanced ablation performance of the graded composite.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Chemistry, Physical
Rong Li, Wenge Chen, Kai Zhou, Yuxuan Sun, Yahui Wen, Zhe Wang, Ahmed Elmarakbi, Yong-Qing Fu
Summary: In this paper, copper-tungsten composites were synthesized by preparing porous tungsten skeletons through directional solidification, ice sublimation, and heat treatment, followed by infiltration of copper. The Cu-15 vol% W composites exhibited alternately patterned Cu and W microstructures and showed a good combination of electrical conductivity and hardness. The strengthening mechanisms were attributed to the tungsten network structures formed in the copper matrix.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Multidisciplinary
Linjuan Kuang, Jian Zhou, Yihao Guo, Huigao Duan, Yong Qing (Richard) Fu
Summary: MEMS accelerometers have great potentials for applications in aerospace, autonomous driving, and consumer electronics. However, their working principles based on capacitive and resistance types are not suitable for wireless and passive sensing. The proposed modeling platform effectively integrates the elastic acoustic effect and wave equations to optimize designs of SAW accelerometers, producing accurate simulation results. The designed SAW accelerometers exhibit high sensitivity, linearity, and wide acceleration range.
Article
Physics, Multidisciplinary
Yihan Zhao, Jian Zhou, Linjuan Kuang, Yihao Guo, Jianfei Xie, Yongqing Fu
Summary: In this paper, a simulation platform was developed to analyze and optimize designs of SAW accelerometers. Variable-thickness and equal-strength beams were designed to solve the issue of non-uniform strain distribution. Frequency responses of SAW accelerometers were successfully obtained using the simulation platform, and its accuracy was verified through experiments. Highly sensitive and equal-strength beam SAW accelerometer, as well as a high-G accelerometer, were achieved.
Article
Chemistry, Multidisciplinary
Yixing Luo, Ming Wen, Jian Zhou, Qingsheng Wu, Guangfeng Wei, Yongqing Fu
Summary: In this study, non-precious-metal based electrocatalysts with highly-exposed and well-dispersed active sites were successfully synthesized. The Co-CoO/NPCF electrocatalyst exhibited remarkable performance for both ORR and OER due to the high exposure of Co-CoO heterostructures and the favorable mass and electron transfer ability of NPCF. Further application of Co-CoO/NPCF in rechargeable ZAB achieved superior performance for liquid-state ZAB and flexible all-solid-state ZAB.
Article
Engineering, Electrical & Electronic
Qiang Liu, Yongwei Xia, Pingsheng Xue, Lu Cai, Qiang Wu, Yongqing Fu
Summary: In this article, we have successfully solved the demodulation difficulty of cascaded photonic crystal fiber interferometers (PCFIs) built by fusion splicing. By controlling the lengths of the collapsed regions, we have achieved more sinusoidal output spectra of partial interferometers, reducing the demodulation difficulty of the sensor network. By using fast Fourier transform (FFT) processing and frequency division multiplexing (FDM), we have achieved separate demodulation of strain for five cascaded interferometers, simplifying and increasing the accuracy of demodulation. Experimental verification shows that the interferometer is not subject to temperature crosstalk.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Boming Lyu, Jian Zhang, Yunjia Li, Yongqing Fu, Honglong Chang, Weizheng Yuan, Kai Tao
Summary: This paper proposes an innovative water charging method for the first time, where the charge-transfer mechanism is suppressed by steering oxygen plasma treatment. The 3D charge distribution map of NPU shape is obtained through the surface potential scanner. The method is applied to DEG and a self-powered thin-film sensor with droplet position monitoring function is prepared. This study demonstrates the feasibility of the proposed water charging method and proposes a new application in the field of water energy harvesting.
2023 IEEE 36TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS, MEMS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Dezhi Nie, Boming Lyu, Yongbo Hu, Jian Zhang, Yongqing Fu, Honglong Chang, Kai Tao
Summary: This paper introduces a cascaded liquid-solid power generator (CLPG) inspired by the Forbidden City's glazed tiles in ancient China. The CLPG converts water flow into droplets through a cascaded structure and collects energy discretely, solving the challenge of efficiently collecting continuous water flow in micro water energy harvesting. The output efficiency of the CLPG is 25 times higher than the existing planar structure, making it a significant development in micro water energy harvesting and self-powered MEMS sensors.
2023 IEEE 36TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS, MEMS
(2023)
Article
Chemistry, Multidisciplinary
Jian Zhou, Ming Wen, Rong Huang, Qingsheng Wu, Yixing Luo, Yakun Tian, Guangfeng Wei, Yongqing Fu
Summary: The electrochemical nitrate reduction reaction (NitRR) into ammonia is a promising route for sustainable ammonia synthesis under ambient conditions. Researchers have found that using materials (e.g., copper-based materials) which are inert in water splitting can enhance the conversion efficiency of nitrate into ammonia by suppressing the competing hydrogen evolution reaction (HER). This study investigates the potential of HER active metals (e.g., nickel) for the NitRR and proposes a strategy of grain boundary (GB) defect engineering of nickel nanoparticles to achieve high NH3 rate and faradaic efficiency by regulating the consumption of H*.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)