Article
Engineering, Electrical & Electronic
Ponnan Sathiyanathan, Lixin Wu, Thomas Walter Schmidt, Tianyuan Li, Gunasekaran Harini Bhuvaneswari, Hongdoo Kim, Arun Anand Prabu, Kap Jin Kim
Summary: This study investigated the changes in beta-crystalline phase in nanofibers using varying content of sulfonated Poly(phenylidene sulfide) as a filler. Among the different samples, the 5 wt.-% sulfonated Poly(phenylidene sulfide) content exhibited the maximum increase in beta-crystallinity, showing a nucleating effect in the nanofibers.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Materials Science, Multidisciplinary
Sepide Taleb, Miguel A. Badillo-Avila, Monica Acuautla
Summary: In this study, 5-9 μm thick PVDF films were successfully fabricated using a nozzle-less ultrasonic spray coating system, showing high uniformity and large d(33) values after annealing. The results demonstrate the potential industrial application of this method for producing large-scale piezoelectric films.
MATERIALS & DESIGN
(2021)
Review
Crystallography
Linfang Xie, Guoliang Wang, Chao Jiang, Fapeng Yu, Xian Zhao
Summary: PVDF is a semicrystalline organic polymer piezoelectric material with high crystallinity and piezoelectric response level. It exhibits excellent mechanical properties, chemical stability, and biocompatibility as a polymer material, making it suitable for various devices.
Article
Materials Science, Coatings & Films
Fei Xiao, Hongxia Zhang, Wei Liu, Jiangbo Zhang, Taixin Liang, Jinghui Hu, Yongli Zhang, Peng Luo
Summary: Uniform coating of polyvinylidene fluoride (PVDF) on the surface of aluminum powder has been achieved by the self-assembly reaction of tannic acid (TA) and iron ions. The PVDF layer is uniformly coated on aluminum particles, improving their water corrosion resistance. Moreover, the combustion and ignition performance of the aluminum composite are significantly enhanced compared to pure aluminum powder.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Chemistry, Physical
Guanchun Rui, Elshad Allahyarov, Honghu Zhang, Ruipeng Li, Shihai Zhang, Philip L. Taylor, Lei Zhu
Summary: This study investigates the effects of chemical defects and high-power ultrasonication on the piezoelectric performance of poly(vinylidene fluoride) (PVDF). The results show that PVDF with a lower head-to-head and tail-to-tail (HHTT) content exhibits higher melting temperature (Tm) and better piezoelectric performance. Additionally, high-power ultrasonication effectively breaks relaxor-like secondary crystals off from PVDF, further enhancing its piezoelectric performance.
Article
Polymer Science
Xiangyi Meng, Qingqing Li, Zhijun Hu, Mingyu Guo
Summary: β-phase enriched PVDF microfibers were prepared for the first time using microfluidic spinning technology. The resulting fibers were weaved into flexible piezoelectric fabrics for in-situ and real-time human motion monitoring. This study provides a promising approach for the development of functional microfibers and wearable piezoelectric sensors.
JOURNAL OF POLYMER SCIENCE
(2022)
Article
Polymer Science
Fatima Ezzahra Bouharras, Massimiliano Labardi, Elpidio Tombari, Simone Capaccioli, Mustapha Raihane, Bruno Ameduri
Summary: The dielectric properties of PVDF-g-BT core-shell structured nanocomposites obtained by RAFT polymerization were investigated. The dielectric constant increased with the addition of BT, exhibiting a larger increase than predicted by usual modeling methods for composite materials, due to the effect of the interfacial core-shell structure. PVDF's known dielectric relaxations were observed in both the neat polymer and its nanocomposites, unaffected by the presence of nanoparticles. A relaxation process due to interfacial polarization was found at higher temperatures, attributed to the high crystallinity of the materials produced by RAFT.
Article
Nanoscience & Nanotechnology
Jiale Fang, Chengqi Chen, Hongxing Qi, Jie Zhang, Xiaoxuan Hou, Likun Pan, Xianghui Wang
Summary: Developing flexible electromagnetic interference (EMI SE) shielding materials is crucial for protecting humans from harmful radiation. We designed and fabricated a flexible multilayer structure of PVDF/GNP-PVDF composite film, which exhibited high EMI SE performance (averaging 69.7 dB in X-band), excellent flexibility, and stability (98.85% retention after bending 1000 cycles at 60 degrees). The theoretical study indicates that the multiple reflection and absorption of electromagnetic waves between layers contribute to the high EMI SE performance of the PVDF/GNP-PVDF multilayer film.
ACS APPLIED NANO MATERIALS
(2023)
Article
Physics, Applied
Huann-Ming Chou, Hui-Chun Yang
Summary: This study presents a new concept to develop a home-made equipment for producing circular-shaped PVDF fiber piezoelectric sensors. The direct-write near-field electrospinning method is used to spin the fibers in an orderly manner, enhancing dipole moment orientation and piezoelectric effect. The electrospinning system consists of a high voltage power supply system, a digitally controlled X-Y table, a solution injection system, and a rotating flat disc collector system. Optimized parameters for the electrospinning process are determined using the uniform design method. The circular-shaped fibers are then packaged with radial electrodes and PET film for measuring dynamic behavior characteristics.
MODERN PHYSICS LETTERS B
(2023)
Article
Chemistry, Multidisciplinary
Tong Li, Minghe Qu, Corey Carlos, Long Gu, Fei Jin, Tao Yuan, Xiaowei Wu, Jijun Xiao, Ting Wang, Wei Dong, Xudong Wang, Zhang-Qi Feng
Summary: The research introduces a new strategy for fabricating soft piezoelectric nanomaterials with excellent performance and stability. A highly sensitive all-fiber-based soft sensor has been successfully developed and demonstrated high accuracy and sensitivity for physiological mechanical stimulation in in vivo experiments.
ADVANCED MATERIALS
(2021)
Article
Polymer Science
Akanksha Adaval, Vaibhav Khurana, Bharat B. Bhatt, Shiva Singh, Dipti Gupta, Pradip K. Maji, Mohammed Aslam, Terence W. Turney, George P. Simon, Arup R. Bhattacharyya
Summary: This study reports the role of noncovalently functionalized 2D nanomaterials on the ferroelectric and piezoelectric behavior of poly(vinylidene fluoride) (PVDF) nanocomposites for the first time. Among the three nanomaterials, Li-AHA-modified h-BN shows the best performance, including a higher extent of polar phase, the highest permittivity, and a higher output peak to peak voltage.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Maria Guillot-Ferriols, Maria Inmaculada Garcia-Briega, Laia Tolosa, Carlos M. Costa, Senentxu Lanceros-Mendez, Jose Luis Gomez Ribelles, Gloria Gallego Ferrer
Summary: Piezoelectric stimulation promotes pre-differentiation of MSCs, and PVDF-CFO cell culture supports offer a wireless stimulation strategy. MSCs embedded in electroactive microspheres can be locally stimulated. This magnetically activated 3D electroactive cell culture support can be used for pre-differentiation of MSCs before transplantation.
Article
Nanoscience & Nanotechnology
Longfei Li, Fei Peng, Guoqiang Zheng, Kun Dai, Chuntai Liu, Changyu Shen
Summary: In this study, a facile strategy for fabricating core-sheath piezoelectric fiber (C-PEF) by electrospinning poly(vinylidene fluoride) (PVDF) onto stainless steel wires was reported. The C-PEF can respond well to bending deformation and can be assembled into a piezoelectric bending sensor for airflow speed sensing. Moreover, the spring-like structured C-PEF (S-C-PEF) can serve as a piezoelectric spring sensor and monitor human sleep behavior in a sophisticated manner. This work paves the way for developing low-cost and reliable multigeometric piezoelectric sensors for bending sensing and health monitoring.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Environmental
Cheng Han, Huan Zhang, Quan Chen, Tao Li, Lingjian Kong, Hui Zhao, Lirong He
Summary: The study successfully constructed an anisotropic PVDF/Mxene device with directionally oriented micropores, exhibiting distinct anisotropic behavior and high sensitivity as a directional sensor over a pressure range.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Jinsheng Fan, Brittany Newell, Jose Garcia, Richard M. Voyles, Robert A. Nawrocki
Summary: This study demonstrates the feasibility of a fully 3D-printed flexible temperature sensor using additive manufacturing. The sensor exhibits high sensitivity and stability in temperature measurement, and the printing parameters greatly affect the performance of the sensor. Dielectric polarization through the corona poling method improves the sensitivity at higher frequencies.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Engineering, Multidisciplinary
Yani Jiang, Zhi Wang, Yuhang Chen, Shien Lu, Jiachen Wu, Yixiang Bian, Wenjia Chen
Summary: A Bionic Cell (BC) and an Electronic Skin (ES) sensor were designed with high sensitivity and a wide measurement range to detect waveform, frequency, and amplitude of surface pressure. The ES has the potential to be used as robot skin with tactile perception ability in the near future.
JOURNAL OF BIONIC ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Pengzhan Liu, Zhenhua Tian, Kaichun Yang, Ty Downing Naquin, Nanjing Hao, Huiyu Huang, Jinyan Chen, Qiuxia Ma, Hunter Bachman, Peiran Zhang, Xiahong Xu, Junhui Hu, Tony Jun Huang
Summary: Acoustofluidic black holes (AFBHs) are a technology that can slow down and capture acoustic waves, enabling versatile particle manipulation functionalities. This study fills the gap between acoustofluidics and acoustic black holes, leading to potential applications in various fields.
Article
Multidisciplinary Sciences
Yixiang Bian, Shien Lu, Zhi Wang, Yongbin Qin, Jialing Li, Guangming Guo, Junjie Gong, Yani Jiang
Summary: The bionic BA, MBSC, and NBSC designed by using SMPF sensor can sense the deformation of the cupula and perceive angular velocity and accelerations. In addition, the endolymph and membranous semicircular canal in the human body may have specific functions.
Article
Acoustics
Huiyu Huang, Pengzhan Liu, Qiuxia Ma, Zihao Tang, Mu Wang, Junhui Hu
Summary: The Al-air flow battery is a promising clean and sustainable energy storage system, which utilizes ultrasonic capillary effect and vibration to recycle electrolyte and agitate the reaction chamber. Experimental and numerical simulation results demonstrate that the acoustofluidic method can greatly enhance the peak power density and reduce energy consumption, weight, and volume of the battery.
ULTRASONICS SONOCHEMISTRY
(2022)
Article
Engineering, Electrical & Electronic
Yani Jiang, Chengdong Guo, Yu Zhang, Wenxuan Zhang, Zhixue Wu, Hui Shen, Junjie Gong, Yixiang Bian
Summary: Inspired by seal vibrissa, a bionic flow sensor was designed and fabricated using PVDF and optical fiber. The sensor had dual-sensing circuits and could sense the direction and magnitude of airflow simultaneously. It also exhibited excellent underwater sensing abilities and a low-velocity detection threshold, paving the way for applications in underwater detection, water leak monitoring, and blood/urine flow monitoring.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Mechanical
Minghui Shi, Shujie Chen, Huiyu Huang, Lichuang Qin, Tengfei Liu
Summary: This paper proposes a novel non-contact ultrasonic motor that can generate levitation force and acoustic driving torque, reducing friction, wear, and heat generation. A theoretical model based on gas film lubrication theory is built to understand the operating mechanism. Finite element method is employed to determine the modal shape and working frequency of the stator. A prototype motor is designed and fabricated to validate the feasibility of the concept and the theoretical model. This study can assist in the design of devices for automated industries and precision positioning systems.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Aerospace
Guangming Guo, Chen Pu, Junjie Gong, Yixiang Bian
Summary: A comprehensive numerical study using the DSMC method investigates the influence of upstream wall slope on aerodynamic properties of rarefied hypersonic flows passing through cavity configurations. It is observed that slope effect, obtained by sloping the upstream wall upward or downward, significantly transforms the cavity flow from open to closed type and reduces peak heat flux. Nevertheless, the effect is found to be minimal when the upstream wall slopes downward or bulges partially. The slope effect is closely related to freestream velocity and altitude, with higher values resulting in a stronger effect. The influence of upstream wall slope is considerably weakened in three-dimensional cavity configurations due to the three-dimensional effect. Based on optimizing the design of hypersonic thermal protection systems, it is recommended to use an upward sloping upstream wall to reduce peak heat flux on the reattachment corner and lower the gas temperature inside the cavity.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
Huiyu Huang, Pengzhan Liu, Qiuxia Ma, Zihao Tang, Mu Wang, Junhui Hu
Summary: In this work, an ultrasonic catalysis method using focused airborne ultrasound (FAU) is demonstrated to enhance the oxygen reduction reaction (ORR) rate and discharge performance of saltwater Al/Mg-air flow batteries. Experimental results show that FAU catalysis can significantly increase the peak power density of the batteries, with a maximum increase of 33.77% for the Mg-air flow battery. Numerical simulation suggests that the enhancement in oxygen diffusion is attributed to the sound pressure and acoustic streaming on the cathode surface. To the best of our knowledge, this is the first attempt to utilize gas-borne ultrasonic catalysis to promote the ORR of metal-air flow batteries.
Article
Engineering, Mechanical
Pengzhan Liu, Huiyu Huang, Xu Wang, Qiang Tang, Xiaomin Qi, Songfei Su, Zongheng Xiang, Junhui Hu
Summary: In this study, an innovative acoustic black hole tweezer (ABHT) is proposed and developed by incorporating a one-dimensional acoustic black hole (ABH) structure. The ABHT can easily achieve multiple manipulation functionalities such as trapping and extraction of particles in various fluidic environments. Numerical simulation and experimental evaluation demonstrate the effectiveness of the ABHT, and the potential of employing ABHs in ultrasonic particle manipulation devices and acoustofluidic devices in the future.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Kunming Chen, Xiaoliang Ding, Libin Tian, Hui Shen, Rujun Song, Yixiang Bian, Qian Yang
Summary: This paper proposes a bistable energy harvester with an M-shaped buckled beam aiming to achieve high-performance piezoelectric energy harvesting under low excitation. Compared with the original monostable M-shaped beam, the proposed harvester can easily maintain large-amplitude interwell oscillation and offer a wider operation bandwidth in a lower frequency range. Numerical and experimental results show that the acceleration threshold required for interwell oscillation can be decreased by reducing the buckling level in bistable configurations, which provides higher voltage and wider operation bandwidth in sweep frequency excitation. Additionally, the performance of the monostable configuration with a softening behavior is better than that with a hardening behavior.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Instruments & Instrumentation
Yani Jiang, Jialong Liu, Wenxuan Zhang, Guangcheng Xiang, Yuhang Chen, Can He, Hui Shen, Junjie Gong, Yixiang Bian
Summary: A Bionic Sensory Hair (BSH) was developed by imitating the Sensory Hair (SH) cell in the saccule, which is responsible for sensing gravity accelerations in the human vestibular system. The BSH arrays were arranged in the bionic macular to prepare a Bionic Saccule (BS). The BSH and BS exhibited a sensitivity similar to that of the human saccule and are expected to be utilized in robotics and clinical disease diagnosis.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Physics, Multidisciplinary
Huiyu Huang, Hao Chen, Chen Li, Pengzhan Liu, Songfei Su, Ruiting Weng, Qiang Tang
Summary: This study introduces Sierpinski-type structural plates to generate diversified acoustofluidic distributions, allowing for the exploration of topographical manipulation and orientational operation in micro/nano-scale particles. By considering fractalized elements in microfluidic lab-on-a-chip devices, unconventional acoustofluidic approaches can be expanded.
Article
Biochemical Research Methods
Jia Yin, Huiyu Huang, Mojing Zheng, Junhui Hu
Summary: In this study, a new ultrasonic biosample disruptor (UBD) was proposed to increase energy efficiency in sample disruption. The UBD design with two triangular teeth on its radiation face showed improved acoustic energy utilization and fragmentation performance compared to the traditional UBD. Experimental results demonstrated that the proposed UBD generated a higher proportion of fragments in the desired length range for both spirulina and tribonema samples, as well as a smaller standard deviation of DNA fragment length, indicating better repeatability. The maximum weight proportion of fragments in the range of 100-300 base pairs was also higher for the proposed UBD.
BIOTECHNOLOGY JOURNAL
(2023)
Article
Biotechnology & Applied Microbiology
Zhi Wang, Shien Lu, Xianjin Wang, Yuhang Chen, Junjie Gong, Yani Jiang, Yixiang Bian
Summary: This study investigates the sensing process of human semicircular canals during head rotation using bionic models. The experiment shows that the deformation of the bionic ampulla depends on the angular acceleration and gravity has a significant influence on the deformation in the vertical plane.
BIOENGINEERING-BASEL
(2022)
Article
Engineering, Multidisciplinary
Yani Jiang, Xianjin Wang, Shien Lu, Yongbin Qin, Can He, Yixiang Bian
Summary: By designing a bionic sensor that imitates sensory cells in the utricle, the study shows that the presence of otoliths and endolymph can improve the sensing ability of the utricle. This research provides a possibility for studying utricle abnormal functions in vitro in the future.
