Article
Chemistry, Analytical
Marius Andrei Olariu, Tudor Alexandru Filip, Catalina Anisoara Peptu, Ina Turcan
Summary: This paper reports the functionality of dielectrophoresis (DEP) for manipulating multi-walled carbon nanotubes (MWCNTs) on printed interdigitated electrodes. The success of DEP manipulation and suitable signal frequencies for avoiding parasitic effects were demonstrated. The time-dependent effect and voltage contribution in MWCNTs bridge formation were discussed.
Article
Chemistry, Analytical
Xu-Bo Wang, Le-Ming He, You-Cao Ma, Wen-Juan Liu, Wei-Jiang Xu, Jun-Yan Ren, Antoine Riaud, Jia Zhou
Summary: This study introduces a method to improve the device bandwidth of PMUT by introducing a PDMS backing structure while maintaining the λ pitch. Adding the backing nearly doubles the bandwidth and has little influence on the impulse response sensitivity. This technology may enable the use of PMUT ultrasonic arrays for high-resolution 3D imaging by widening the transducer bandwidth.
Article
Optics
Bibek R. Samanta, Flavio Pardo, Todd Salamon, Rose Kopf, Michael S. Eggleston
Summary: This paper presents an electrothermally actuated MEMS mirror capable of reliable linear raster scanning with a large angular range of motion. A simple pulse design technique and segmented polysilicon microheaters are used to achieve high-speed scanning and low power consumption.
Article
Multidisciplinary Sciences
Zichao Yuan, Chenguang Lu, Cong Liu, Xiangge Bai, Lei Zhao, Shile Feng, Yahua Liu
Summary: This study proposes a droplet ultrasonic tweezer (DUT) based on phased array for versatile droplet manipulation. By changing the position of the focal point, the DUT can generate a twin trap ultrasonic field for trapping and maneuvering the droplet, enabling highly flexible and precise programmable control. The findings provide a satisfactory paradigm for robust contactless droplet manipulation in various practical settings.
Article
Materials Science, Multidisciplinary
Anatolii Makhinia, Kathrin Hubscher, Valerio Beni, Peter Andersson Ersman
Summary: This work presents a novel fabrication approach to manufacture fully printed organic electrochemical transistors and logic circuits with superior performances. The use of aerosol jet printing allows for a reduction in size and volume of the devices, resulting in high ON/OFF ratio and fast switching response.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Engineering, Electrical & Electronic
Onuma Santawitee, Bralee Chayasombat, Chanchana Thanachayanont, Kroekchai Inpor, Seeroong Prichanont, Yoottapong Klinthongchai, Angkana Phongphut, Helene Debeda
Summary: This work presents the application of mass-sensitive microcantilevers coated with HMDS-MCF-Si for detecting solvent vapors. The microcantilevers demonstrated longitudinal vibration mode with high quality factor when coated with HMDS-MCF-Si. The results showed that the microcantilever coated with HMDS-MCF-Si had the largest response to toluene vapor and the lowest response to water vapor.
IEEE SENSORS JOURNAL
(2022)
Article
Energy & Fuels
Ning Chen, Dominik Rudolph, Christoph Peter, Miro Zeman, Olindo Isabella, Yitzchak (Isaac) Rosen, Michael Grouchko, Ofer Shochet, Valentin D. Mihailetchi
Summary: This study demonstrates the use of copper paste as a replacement for silver in industrial solar cells, achieving comparable efficiency and stability. The copper paste exhibits low resistivity and shows no diffusion under different environmental conditions. These findings open up a new application for copper paste and contribute to the reduction of silver usage and cost.
Article
Engineering, Electrical & Electronic
Myeongjong Go, Xue Qi, Paolo Matteini, Byungil Hwang, Sooman Lim
Summary: This study demonstrated a stretchable strain sensor based on CB/CNT composite with different line resolutions, showing controllable sensitivity and stable performance for human motion detection. The research optimized composite formula through rheological properties investigation and explored the relation among printed line width, resistance, conductivity, and line thickness.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Engineering, Manufacturing
Yingjun Zeng, Guochun Chen, Fuxin Zhao, Chao Wu, Lida Xu, Xiaochuan Pan, Fan Lin, Lanlan Li, Gonghan He, Qinnan Chen, Daoheng Sun, Zhenyin Hai
Summary: In this study, a high-temperature thick film platinum (Pt) RTD array based on 3D printing technology is presented for high-temperature field measurement sensing applications at 50-800 degrees C. The analysis of microstructure, phase composition, and electrical properties revealed three stages of Pt film sintering during the sintering process. The printed Pt films, confirmed to contain glass powder, exhibit excellent anti-aggregation and high-temperature properties compared to sputtered films. The resulting Pt RTD array shows outstanding stability (drift rate of 0.07%/h at 800 degrees C) and high accuracy (0.75% fullscale), and can realize temperature gradient monitoring of a two-dimensional temperature field. The potential applications of the Pt RTD array, including bolt and rocket engine tester exhaust flame temperature monitoring, were demonstrated. This study paves the way for printing RTD arrays directly on curved parts.
ADDITIVE MANUFACTURING
(2023)
Article
Chemistry, Multidisciplinary
Baoying Lin, Yinyin Zheng, Jinglu Wang, Qian Tu, Wentao Tang, Liangzhe Chen
Summary: The emergence of the Internet of things has led to an increased demand for flexible and miniaturized supercapacitors. This study focuses on the fabrication of screen-printed electrodes using hierarchical V3O7 with rodlike texture, which exhibits excellent capacitance retention and cycling stability. Furthermore, a flexible V3O7 symmetrical supercapacitor shows outstanding areal specific capacitance, cycling stability, energy density, flexibility, and durability. This work provides a facile and low-cost reference for large-scale fabrication of flexible supercapacitors using screen-printed ink.
Article
Chemistry, Applied
Yi Yang, Min Li, Shaohai Fu
Summary: Photochromic textiles with high fastness were successfully prepared using self-adhesive polymer latex particles based on spiropyran. The textiles showed excellent photochromic properties and soft hand feel compared to conventional printing methods. The prepared photochromic textiles also exhibited fast UV-response performance and impressive reusability after multiple washing cycles, indicating great potential for wearable and flexible applications.
PROGRESS IN ORGANIC COATINGS
(2021)
Article
Chemistry, Analytical
Luis Pelaez Murciego, Abiodun Komolafe, Nikola Perinka, Helga Nunes-Matos, Katja Junker, Ander Garcia Diez, Senentxu Lanceros-Mendez, Russel Torah, Erika G. Spaich, Strahinja Dosen
Summary: In this study, a novel dry electrode called TEX was introduced as a practical solution for high-density electromyography. Compared to traditional electrodes, TEX showed similar signal quality and functional application, while being more convenient for practical use.
Article
Chemistry, Multidisciplinary
Hai Li, Sooman Lim
Summary: This study developed a screen-printed piezoelectric nanogenerator with improved performance by optimizing the material and structure, resulting in higher output voltage and power density. Furthermore, the printed devices were able to adapt to human movements and had excellent detection capability.
Article
Engineering, Mechanical
Kaipeng Ji, Peng Zhao, Chaojie Zhuo, Jian Chen, Xianghong Wang, Shiquan Gao, Jianzhong Fu
Summary: In this paper, an ultrasonic imaging method based on frequency-domain reverse-time migration (FD-RTM) was developed for defect detection in curved-surface components (CSC). The method showed high-quality imaging and obvious advantages compared to existing methods.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Chemistry, Physical
A. Selmi, O. Khaldi, M. Mascot, F. Jomni, J-C Carru
Summary: The research successfully prepared a Metal-Ferroelectric-Metal capacitor structure using lead-free ferroelectric Ba0.85Sr0.15TiO3 thick films on silicon substrates by screen printing. The thick film exhibited good adhesion and uniform thickness, with high tunability, low dielectric loss tangent, and leakage current, making it a promising candidate for various modern electronic tunable devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Biomedical
Joseph A. Sebastian, Eric M. Strohm, Emmanuel Cherin, Bahram Mirani, Christine E. M. Demore, Michael C. Kolios, Craig A. Simmons
Summary: High-frequency ultrasound can non-invasively characterize and monitor the acoustic properties of biomaterials and engineered tissues. A new method is proposed to accurately measure the speed of sound, acoustic impedance, and acoustic attenuation of cell-laden hydrogels, taking into account the frequency-dependent effects of attenuation in coupling media, hydrogel thickness, and interfacial transmission/reflection coefficients of ultrasound waves. The acoustic attenuation coefficients were found to increase with increasing cell concentration, reflecting the cellularity of the hydrogel independent of its thickness.
ACTA BIOMATERIALIA
(2023)
Article
Chemistry, Analytical
Eun-Bee Jo, Yoon-A Lee, Yoon-A Cho, Paul A. Guenther, Sylvia E. Gebhardt, Holger Neubert, Hyun-Seok Kim
Summary: In this study, a 0-3 piezoelectric composite based on lead zirconate-titanate (PZT)/polyvinyl-butyral (PVB) was fabricated and characterized for its potential application in tactile sensing. The sensitivity and response time of the sensor were measured, and the results showed that the composite had high sensitivity and fast response time.
Article
Instruments & Instrumentation
J. Fischer, J. Doentgen, C. Molin, S. E. Gebhardt, Y. Hambal, V. V. Shvartsman, D. C. Lupascu, D. Haegele, J. Rudolph
Summary: A contactless technique is introduced for direct time-resolved measurements of the full dynamics of the adiabatic temperature change in electrocaloric materials. The technique detects the infrared radiation emitted by the electrocaloric sample with μs time resolution and mK temperature resolution. Time-resolved measurements of the electrocaloric effect are presented at kHz frequencies and small field strengths. The technique allows for the simultaneous recording of transient behaviors in the applied electric field and induced polarization, providing a comprehensive understanding of the correlation between electrocaloric and ferroelectric properties. Additionally, it can be used for continuous fatigue measurements for >10(6) electric field cycles.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Chemistry, Multidisciplinary
Han Wang, Jingxiao Zhang, Lin Gan, Yu Liu
Summary: This paper proposes a directional monotone noise reduction method using a feedforward active noise control (ANC) structure with filtered-x least mean square (FxLMS) algorithms. The system utilizes a parametric array loudspeaker (PAL) as the active noise-canceling source with high audio directivity for directional noise suppression. Compared to traditional ANC methods with a voice coil loudspeaker (VCL), our PAL-based system achieves similar noise suppression performance with improved source-to-target distance and audio main lobe beam width reduction.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Inorganic & Nuclear
Zhenglyu Li, Christian Molin, Sylvia E. Gebhardt
Summary: This paper investigates the influence of sintering additives CuO and MgO on the lead-free electrocaloric material BSSnT-18-6.5. The addition of 2% CuO significantly reduces the sintering temperature, while the addition of 1% MgO reduces the grain size and improves the dielectric breakdown strength. The results show that BSSnT-18-6.5 with MgO addition achieves significant EC temperature changes within a broad temperature range, making it suitable for future electrocaloric applications.
Article
Acoustics
Martin Angerer, Michael Zapf, Sylvia E. Gebhardt, Holger Neubert, Nicole V. Ruiter
Summary: A potential method for future breast cancer screening is 3-D ultrasound computed tomography (USCT). In this article, a new transducer array design is presented to be utilized in a third generation 3-D USCT system. The design provides random transducer positioning, isotropic sound emission, large bandwidth, and wide opening angle. Characterization of the acoustic field showed isotropic fields with a mean bandwidth of 131% and an opening angle of 42 degrees.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2023)
Article
Engineering, Electrical & Electronic
Stefan Moench, Richard Reiner, Kareem Mansour, Patrick Waltereit, Michael Basler, Rudiger Quay, Christian Molin, Sylvia Gebhardt, David Bach, Roland Binninger, Kilian Bartholome
Summary: This work combines two power converters, one with a high efficiency of 99.2% and the other with low losses, to create a six-level prototype with an overall efficiency of 99.74%. The high charging efficiency enables a high coefficient of performance (COP) for electrocaloric heat pumps. It is predicted that the combination of the electrical charging efficiency and electrocaloric material data can surpass 50% of the thermal Carnot limit, paving the way for future high-performance electrocaloric heat pumps.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2023)
Article
Computer Science, Information Systems
Yunpeng Yin, Han Wang, Shuai Liu, Jinglin Sun, Peiguang Jing, Yu Liu
Summary: This article proposes an Internet of Things (IoT) architecture for early diagnosis of Alzheimer's disease (AD) using eye-tracking and machine learning. By collecting and analyzing eye movement data, the system can accurately identify early-stage AD patients with high accuracy.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Article
Energy & Fuels
Jan Schipper, David Bach, Stefan Moench, Christian Molin, Sylvia Gebhardt, Juergen Woellenstein, Olaf Schaefer-Welsen, Christian Vogel, Robin Langebach, Kilian Bartholome
Summary: Efficiency improvements in heat pump can reduce global energy demand. Caloric heat pumps are being explored as a more efficient alternative to vapor compression systems, driven by solid-state materials with significant temperature changes when a field is applied. The efficiency of caloric cooling systems is impacted by power dissipation during phase transitions, which can be quantified by a figure of merit (FOM) derived from material properties.
JOURNAL OF PHYSICS-ENERGY
(2023)
Article
Engineering, Electrical & Electronic
Han Wang, Xin Liu, Peiguang Jing, Yu Liu
Summary: This letter investigates the use of acoustic radiation forces generated by air-coupled ultrasound to provide contactless tactile feedback in mid air. Simulation studies and practical experiments show that unfocused vortex beams produced by a 16-element planar transducer array offer advantages in delivering large areas of plane-like haptic sensations with naturally distributed pressure hot spots compared to traditional point-focused beams. This letter also demonstrates that mid-air haptics can be efficiently rendered through amplitude modulation (AM) or spatiotemporal modulation (STM) of the vortex beams. The results prove the feasibility of using acoustic vortices as a cost-effective method for delivering haptics with small aperture arrays.
IEEE SENSORS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Jinglin Sun, Zhipeng Wu, Han Wang, Peiguang Jing, Yu Liu
Summary: This study proposes an integrated binocular eye-tracking device with stereo stimuli, which can provide highly accurate 3D point-of-gaze estimation. A regression-based eye-tracking model is built based on collected eye movement data and validated through experiments. This technology has broad application prospects in 3D vision technologies and medical applications related to neurological diseases.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Proceedings Paper
Acoustics
Nidhi Singh, Emmanuel Cherin, Carlos-Felipe Roa, Gang Zheng, F. Stuart Foster, Christine E. M. Demore, Yohannes Soenjaya, Ayushi Patel
Summary: This study presents a combined micro-ultrasound photoacoustic imaging system for in vivo imaging, which can simultaneously visualize oxygenated, deoxygenated hemoglobin, and an exogenous photoacoustic contrast agent called porphysome nanoparticles. Spectral unmixing is used to separate the different signals. Longitudinal imaging with porphysomes shows that the photoacoustic signal peaks at 6 hours after injection and gradually degrades.
2022 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IEEE IUS)
(2022)
Proceedings Paper
Acoustics
Carlos-Felipe Roa, Jacqueline Caminiti, Jianhua Yin, Aaron Boyes, Emmanuel Cherin, Nidhi Singh, F. Stuart Foster, Christine E. M. Demore
Summary: In this study, the authors present a method for fabricating miniaturized linear arrays for endoscopic micro-ultrasound. By limiting the area used for electrical connection and placing the signal electrodes on the back surface of the array, they achieved an endoscopic form factor and demonstrated the potential of this technique.
2022 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IEEE IUS)
(2022)
Proceedings Paper
Acoustics
Claire Thring, Daniel Irving, Dave Hughes
Summary: This study demonstrates the successful detection and thickness measurement of 10 to 40 μm thick silicone resin coatings from the far side of a 6 mm thick mild steel wall using a high temperature thin film sensor capable of conforming to curved surfaces.
2022 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IEEE IUS)
(2022)
Article
Computer Science, Information Systems
Stefan Moench, Richard Reiner, Patrick Waltereit, Christian Molin, Sylvia Gebhardt, David Bach, Roland Binninger, Kilian Bartholome
Summary: This work analyzes how an over 99% efficient charging circuit and electrical offset fields enhance the coefficient of performance (COP) of electrocaloric heat pumps. The results show that the offset field can reduce material loss and improve system COP. The approach used in this work reduces charging loss by 20 times compared to state-of-the-art resonant circuits for electrocalorics, making a valuable contribution to electrocaloric heat pump systems.
