A5019966763- Ultrasound and Hyperthermia Applications
- Photoacoustic and Ultrasonic Imaging
- Ultrasound Imaging and Elastography
- Acoustic Wave Resonator Technologies
- Ferroelectric and Piezoelectric Materials
- Ultrasonics and Acoustic Wave Propagation
- Venous Thromboembolism Diagnosis and Management
- Advanced Sensor and Energy Harvesting Materials
- Ultrasound and Cavitation Phenomena
- Nonlocal and gradient elasticity in micro/nano structures
- Advanced MEMS and NEMS Technologies
- Vibration Control and Rheological Fluids
- Microwave Dielectric Ceramics Synthesis
- Dielectric materials and actuators
- Innovative Energy Harvesting Technologies
- Structural Health Monitoring Techniques
- Multiferroics and related materials
- Thermography and Photoacoustic Techniques
- Mechanical and Optical Resonators
- Microfluidic and Bio-sensing Technologies
- Conducting polymers and applications
- Muscle activation and electromyography studies
- Diagnosis and Treatment of Venous Diseases
- Flow Measurement and Analysis
- Coronary Interventions and Diagnostics
North Carolina State University
2016-2025
Hangzhou Normal University
2024
North Central State College
2021-2024
University of North Carolina at Chapel Hill
2012-2023
Dalian University of Technology
2019-2023
UNC/NCSU Joint Department of Biomedical Engineering
2023
Shanghai Jiao Tong University
2021-2022
Singapore University of Technology and Design
2022
University of Alberta
2022
Electronics and Telecommunications Research Institute
2021
Piezoelectric sensing is of increasing interest for high-temperature applications in aerospace, automotive, power plants and material processing due to its low cost, compact sensor size simple signal conditioning, comparison with other techniques. This paper presented an overview piezoelectric Firstly, different types single crystals, electrode materials, their pros cons are discussed. Secondly, recent work on sensors including accelerometer, surface acoustic wave sensor, ultrasound...
In this paper, the interdisciplinary energy harvesting issues on piezoelectric were investigated using a '33' mode (mechanical stress and/or electric field are in parallel to polarization direction) lead zirconate titanate multilayer stack (PZT-Stack). Key characteristics including generated electrical energy/power PZT-Stack, mechanical conversion efficiency, power delivered from PZT-Stack resistive load, charge/energy transferred super-capacitor systematically addressed. Theoretical models...
Piezoelectric materials are essential parts of the electronics and electrical equipment used for consumer industrial applications, such as ultrasonic piezoelectric transducers, sensors, actuators, transformers, resonators. In this review, development figures merit various electromechanical applications surveyed, focusing on crystals, i.e., high-performance relaxor-PbTiO3-based perovskite ferroelectric crystals nonferroelectric high-temperature crystals. The uniqueness these is discussed with...
Generation of high power laser ultrasound strongly demands the advanced materials with efficient energy absorption, fast thermal diffusion, and large thermoelastic expansion capabilities. In this study, candle soot nanoparticles-polydimethylsiloxane (CSNPs-PDMS) composite was investigated as functional layer for an optoacoustic transducer high-energy conversion efficiency. The mean diameter collected carbon nanoparticles is about 45 nm, light absorption ratio at 532 nm wavelength up to...
The photoacoustic effect has been broadly applied to generate high frequency and broadband acoustic waves using lasers. However, the efficient conversion from laser energy power is required with intensity pressure (>10 MPa). In this study, we demonstrated generated carbon nanofibers–polydimethylsiloxane (CNFs-PDMS) thin films. average diameter of CNFs 132.7 ± 11.2 nm. thickness film CNFs-PDMS composite 24.4 1.43 μm 57.9 2.80 μm, respectively. maximum 12.15 1.35 MPa a 4.2 mJ, 532 nm...
In this paper, 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 (PMN-30%PT) single crystal samples were poled using an alternating current (electric field) poling (ACP) method. Compared to the traditional method, piezoelectric coefficient, free and clamped dielectric constants improved more than 21%. X-ray diffraction result suggests existence of monoclinic phase (MA) in ACP piezoresponse force microscopy (PFM) further depicts finer engineered domain structures. The sample also showed unique transition...
Abstract Effective removal or dissolution of large blood clots remains a challenge in clinical treatment acute thrombo-occlusive diseases. Here we report the development an intravascular microbubble-mediated sonothrombolysis device for improving thrombolytic rate and thus minimizing required dose drugs. We hypothesize that sub-megahertz, forward-looking ultrasound transducer with integrated microbubble injection tube is more advantageous efficient thrombolysis by enhancing cavitation-induced...
Thin film flexoelectricity is attracting more attention because of its enhanced effect and potential application in electronic devices. Here we find that a mechanical bending induced significantly modulates the electrical transport properties interfacial two-dimensional electron gas (2DEG) at LaAlO_{3}/SrTiO_{3} (LAO/STO) heterostructure. Under variant states, both carrier density mobility 2DEG are changed according to flexoelectric polarization direction, showing an electric field...
In force measurement applications, a piezoelectric sensor is one of the most popular sensors due to its advantages low cost, linear response, and high sensitivity. Piezoelectric effectively convert dynamic forces electrical signals by direct effect, but their use has been limited in measuring static easily neutralized surface charge. To overcome this shortcoming, several (either pure or quasistatic) sensing techniques using materials have developed utilizing unique parameters rather than...
Abstract High sensitivity and fast response are the figures of merit for benchmarking commercial sensors. Due to advantages intrinsic signal amplification, bionic ability, mechanical flexibility, electrochemical transistors (ECTs) have recently gained increasing popularity in constructing various In current work, we proposed a pulse‐driven synaptic ECT supersensitive ultrafast biosensors. By pulsing presynaptic input (drain bias, V D ) setting modulation potential (gate bias) near...
Piezoelectric materials possess the capability to interchangeably convert electrical energy into a mechanical response. While current piezoelectric exhibit strong properties, known limitations have inhibited further development. This review describes ability combine different composite create well-rounded properties. The types of connectivity classes are described as well important design considerations and theoretical models. contributions from active passive phases outlined, focusing...
Robotic prostheses and powered exoskeletons are novel assistive robotic devices for modern medicine. Muscle activity sensing plays an important role in controlling robotics devices. Most measure the surface electromyography (sEMG) signal myoelectric control. However, sEMG is integrated from muscle activities. It difficult to sense movements specific small regions, particularly at different depths. Alternatively, traditional ultrasound imaging has recently been proposed monitor due its...
High temperature sensors are of major importance to aerospace and energy related industries. In this letter, a high monolithic compression-mode piezoelectric accelerometer was fabricated using YCa4O(BO3)3 (YCOB) single crystals. The performance the sensor tested as function up 1000 °C over frequency range 100–600 Hz. prototype found possess sensitivity 2.4±0.4 pC/g, across measured range, indicating low coefficient. Furthermore, exhibited good stability an extended dwell time at 900 °C,...
Operation at temperatures well above ambient is desired for applications such as smart structures integrated within aircraft and space vehicles. Piezoelectric yttrium calcium oxyborate single crystal YCa4O(BO3)3 (YCOB) was found to exhibit no phase transition until its melting temperature around ∼1500°C. The characteristics of the resonance frequency, electromechanical coupling, dielectric permittivity were studied in range 30–950°C different orientations. electrical resistivity 800°C be...