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https://www.readbyqxmd.com/read/28440336/ultrahigh-energy-density-harvested-from-domain-engineered-relaxor-ferroelectric-single-crystals-under-high-strain-rate-loading
#1
Sergey I Shkuratov, Jason Baird, Vladimir G Antipov, Evgueni F Talantsev, Jay B Chase, Wesley Hackenberger, Jun Luo, Hwan R Jo, Christopher S Lynch
Relaxor ferroelectric single crystals have triggered revolution in electromechanical systems due to their superior piezoelectric properties. Here the results are reported on experimental studies of energy harvested from (1-y-x)Pb(In1/2Nb1/2)O3-(y)Pb(Mg1/3Nb2/3)O3-(x)PbTiO3 (PIN-PMN-PT) crystals under high strain rate loading. Precise control of ferroelectric properties through composition, size and crystallographic orientation of domains made it possible to identify single crystals that release up to three times more electric charge density than that produced by PbZr0...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28439542/ch3nh3pbi3-perovskites-ferroelasticity-revealed
#2
Evgheni Strelcov, Qingfeng Dong, Tao Li, Jungseok Chae, Yuchuan Shao, Yehao Deng, Alexei Gruverman, Jinsong Huang, Andrea Centrone
Ferroelectricity has been proposed as a plausible mechanism to explain the high photovoltaic conversion efficiency in organic-inorganic perovskites; however, convincing experimental evidence in support of this hypothesis is still missing. Identifying and distinguishing ferroelectricity from other properties, such as piezoelectricity, ferroelasticity, etc., is typically nontrivial because these phenomena can coexist in many materials. In this work, a combination of microscopic and nanoscale techniques provides solid evidence for the existence of ferroelastic domains in both CH3NH3PbI3 polycrystalline films and single crystals in the pristine state and under applied stress...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28438313/analysis-of-the-metal-layer-thickness-influence-on-the-dispersion-characteristics-of-acoustic-waves-propagating-in-the-layered-piezoelectric-structure-me-aln-me-diamond
#3
S I Burkov, O P Zolotova, B P Sorokin
The paper presents the results of computer simulation of the acoustic waves propagation in piezoelectric layered structures based on diamond substrate under the influence of various metal film deposition. It has been observed that the maximum phase velocity change Δv/v is achieved with an "Au/(001) AlN/Au/(100) diamond" PLS configuration. However, if the acoustic impedance of the metal layer is greater than the acoustic impedance of the substrate, an elastic wave reflection can be observed, reducing the Δv/v quantities...
March 18, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28437016/electromechanical-nanogenerator-cell-interaction-modulates-cell-activity
#4
Gonzalo Murillo, Andreu Blanquer, Carolina Vargas-Estevez, Lleonard Barrios, Elena Ibáñez, Carme Nogués, Jaume Esteve
Noninvasive methods for in situ electrical stimulation of human cells open new frontiers to future bioelectronic therapies, where controlled electrical impulses could replace the use of chemical drugs for disease treatment. Here, this study demonstrates that the interaction of living cells with piezoelectric nanogenerators (NGs) induces a local electric field that self-stimulates and modulates their cell activity, without applying an additional chemical or physical external stimulation. When cells are cultured on top of the NGs, based on 2D ZnO nanosheets, the electromechanical NG-cell interactions stimulate the motility of macrophages and trigger the opening of ion channels present in the plasma membrane of osteoblast-like cells (Saos-2) inducing intracellular calcium transients...
April 24, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28436838/electromechanical-coupling-factor-of-breast-tissue-as-a-biomarker-for-breast-cancer
#5
Kihan Park, Wenjin Chen, Marina Chekmareva, David Foran, Jaydev Desai
GOAL: This research aims to validate a new biomarker of breast cancer by introducing electromechanical coupling factor of breast tissue samples as a possible additional indicator of breast cancer. Since collagen fibril exhibits a structural organization that gives rise to a piezoelectric effect, the difference in collagen density between normal and cancerous tissue can be captured by identifying the corresponding electromechanical coupling factor. METHODS: The design of a portable diagnostic tool and a microelectromechanical systems(MEMS)- based biochip, which is integrated with a piezoresistive sensing layer for measuring the reaction force as well as a microheater for temperature control, is introduced...
April 19, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28433212/comparison-between-piezoelectric-surgery-and-conventional-saw-in-sagittal-split-osteotomies-a-systematic-review
#6
REVIEW
L F Silva, E N R Carvalho-Reis, J P Bonardi, V N de Lima, G A C Momesso, I R Garcia-Junior, L P Faverani
A systematic review of the advantages and disadvantages of piezoelectric surgery in comparison with conventional saws for sagittal split osteotomy (SSO) was performed. Relevant studies published in the last 10 years were identified through a search of the PubMed/MEDLINE, Science Direct, and Embase databases and assessed against predetermined eligibility criteria. The initial search resulted in 1736 articles. After applying the inclusion and exclusion criteria, 12 articles remained. A total of 799 patients with an average age of 27...
April 19, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28430410/modelling-and-simulation-of-piezoelectrically-driven-self-charging-lithium-ion-batteries
#7
Zhiguo Wang
Self-charging lithium ion batteries (SCLIBs) that hybridize mechanical energy harvesting and storage processes into one process can be fabricated using a piezoelectric polyvinylidene fluoride (PVDF) film as a separator in lithium ion batteries. In this paper, the deintercalation reaction at LiCoO2 and intercalation reaction at graphite were studied under an internal piezoelectric field using density functional theory. It was found that the internal piezoelectric field applied on the anode can increase intercalation energies and diffusion behavior, at the same time, the internal piezoelectric field facilitates the deintercalation reaction at the cathode...
April 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28430232/phase-locking-of-a-mode-locked-titanium-sapphire-laser-based-optical-frequency-comb-to-a-reference-laser-using-a-fast-piezoelectric-actuator
#8
Shuhei Hatanaka, Kazuhiko Sugiyama, Masatoshi Mitaki, Masatoshi Misono, Sergey N Slyusarev, Masao Kitano
We phase lock an octave-spanning optical frequency comb, generated using a mode-locked titanium-sapphire laser and a photonic-crystal fiber, to a continuous-wave laser line-narrowed to a reference cavity. To phase lock the pulse-repetition frequency, the cavity length of the mode-locked laser is controlled by using a fast piezoelectric-actuated mirror of a servo bandwidth up to 80 kHz. The residual phase noise is 0.35 rad, and 89% of the power is concentrated to the carrier. To apply the system to optical frequency-ratio measurements and to evaluate the phase locking, a simultaneous frequency measurement of the beat between the other mode of the comb and another laser line-narrowed to a different resonance of the common reference cavity is demonstrated...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28425532/emerging-tellurium-nanostructures-controllable-synthesis-and-their-applications
#9
REVIEW
Zhen He, Yuan Yang, Jian-Wei Liu, Shu-Hong Yu
Tellurium (Te) is a rare element in trace amounts of about one part per billion, comparable to that of platinum and ranked 75th in the abundance of the elements in the earth crust. Te nanostructures, as narrow bandgap semiconductors, have numerous potential applications in the fabrication of many modern devices. The past decades have witnessed an explosion in new strategies for synthesizing diverse emerging Te nanostructures with controlled compositions, sizes, shapes, and structures. Their structure-determined nature makes functional Te nanomaterials an attractive candidate for modern applications...
April 20, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28425209/identification-of-dynamic-load-for-prosthetic-structures
#10
Dequan Zhang, Xu Han, Zhongpu Zhang, Jie Liu, Chao Jiang, Nobuhiro Yoda, Xianghua Meng, Qing Li
Dynamic load exists in numerous biomechanical systems and its identification signifies a critical issue for characterizing dynamic behaviors and studying biomechanical consequence of the systems. This study aims to identify dynamic load in the dental prosthetic structures, namely three-unit implant-supported fixed partial denture (I-FPD) and teeth-supported fixed partial denture (T-FPD). The three-dimensional (3D) finite element (FE) models were constructed through patient's computerized tomography (CT) images...
April 20, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28425028/energy-harvesting-from-cerebrospinal-fluid-pressure-fluctuations-for-self-powered-neural-implants
#11
Levent Beker, Arnau Benet, Ali Tayebi Meybodi, Ben Eovino, Albert P Pisano, Liwei Lin
In this paper, a novel method to generate electrical energy by converting available mechanical energy from pressure fluctuations of the cerebrospinal fluid within lateral ventricles of the brain is presented. The generated electrical power can be supplied to the neural implants and either eliminate their battery need or extend the battery lifespan. A diaphragm type harvester comprised of piezoelectric material is utilized to convert the pressure fluctuations to electrical energy. The pressure fluctuations cause the diaphragm to bend, and the strained piezoelectric materials generate electricity...
June 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28422658/equivalent-magnetic-noise-in-magnetoelectric-laminates-comprising-bidomain-linbo-sub-3-sub-crystals
#12
Joao Vidal, Andrey V Turutin, Ilya V Kubasov, Mikhail D Malinkovich, Yurii N Parkhomenko, Svetlana P Kobeleva, Andrei L Kholkin, Nikolai A Sobolev
The anisotropic direct magnetoelectric (ME) properties of bi-layered composites comprising magnetostrictive metglas foils and single-crystalline piezoelectric bidomain plates of 127ºY-cut LiNbO<sub>3<sub> (LNO) have been studied theoretically and experimentally. The LNO plates possessed an engineered ferroelectric macrobidomain structure with opposite spontaneous polarization vectors. Impedance, ME effect and equivalent magnetic noise density measurements have been performed under quasi-static and resonant conditions...
April 13, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28422085/resonant-rectifier-ics-for-piezoelectric-energy-harvesting-using-low-voltage-drop-diode-equivalents
#13
Amad Ud Din, Seneke Chamith Chandrathna, Jong-Wook Lee
Herein, we present the design technique of a resonant rectifier for piezoelectric (PE) energy harvesting. We propose two diode equivalents to reduce the voltage drop in the rectifier operation, a minuscule-drop-diode equivalent (MDDE) and a low-drop-diode equivalent (LDDE). The diode equivalents are embedded in resonant rectifier integrated circuits (ICs), which use symmetric bias-flip to reduce the power used for charging and discharging the internal capacitance of a PE transducer. The self-startup function is supported by synchronously generating control pulses for the bias-flip from the PE transducer...
April 19, 2017: Sensors
https://www.readbyqxmd.com/read/28420152/measurement-of-pressure-fluctuations-inside-a-model-thrust-bearing-using-pvdf-sensors
#14
Andrew Youssef, David Matthews, Andrew Guzzomi, Jie Pan
Thrust bearings play a vital role in propulsion systems. They rely on a thin layer of oil being trapped between rotating surfaces to produce a low friction interface. The "quality" of this bearing affects many things from noise transmission to the ultimate catastrophic failure of the bearing itself. As a result, the direct measure of the forces and vibrations within the oil filled interface would be very desirable and would give an indication of the condition of the bearing in situ. The thickness of the oil film is, however, very small and conventional vibration sensors are too cumbersome to use in this confined space...
April 16, 2017: Sensors
https://www.readbyqxmd.com/read/28415456/osteoinductive-composite-coatings-for-flexible-intramedullary-nails
#15
E N Bolbasov, A V Popkov, D A Popkov, E N Gorbach, I A Khlusov, A S Golovkin, A Sinev, V M Bouznik, S I Tverdokhlebov, Y G Anissimov
This work presents composite coatings based on a copolymer of vinylidene fluoride with tetrafluoroethylene (VDF-TeFE) and hydroxyapatite (HA) for flexible intramedullary nails (FIN). The effect of the proportion of VDF-TeFE (100-25% wt.) on physicochemical and biological properties of the composite coatings was investigated. It was shown that a decrease of VDF-TeFE in the coating hinders its crystallization in β and γ forms which have piezoelectric properties. The decrease also reduces an adhesive strength to 9...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28412983/piezoelectric-technology-in-otolaryngology-and-head-and-neck-surgery-a-review
#16
C Meller, T E Havas
BACKGROUND: Piezoelectric technology has existed for many years as a surgical tool for precise removal of soft tissue and bone. The existing literature regarding its use specifically for otolaryngology, and head and neck surgery was reviewed. METHODS: The databases Medline, the Cochrane Central Register of Controlled Trials, PubMed, Embase and Cambridge Scientific Abstracts were searched. Studies were selected and reviewed based on relevance. RESULTS: Sixty studies were identified and examined for evidence of benefits and disadvantages of piezoelectric surgery and its application in otolaryngology...
April 17, 2017: Journal of Laryngology and Otology
https://www.readbyqxmd.com/read/28412656/design-optimization-of-embedded-ultrasonic-transducers-for-concrete-structures-assessment
#17
Cédric Dumoulin, Arnaud Deraemaeker
In the last decades, the field of structural health monitoring and damage detection has been intensively explored. Active vibration techniques allow to excite structures at high frequency vibrations which are sensitive to small damage. Piezoelectric PZT transducers are perfect candidates for such testing due to their small size, low cost and large bandwidth. Current ultrasonic systems are based on external piezoelectric transducers which need to be placed on two faces of the concrete specimen. The limited accessibility of in-service structures makes such an arrangement often impractical...
April 9, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28410558/ultrasensitive-vertical-piezotronic-transistor-based-on-zno-twin-nanoplatelet
#18
Longfei Wang, Shuhai Liu, Xiaolong Feng, Qi Xu, Suo Bai, Laipan Zhu, Libo Chen, Yong Qin, Zhong Lin Wang
High sensitivity of pressure/strain sensor is the key to accurately evaluate external mechanical stimuli and could become more important in future generations of human-machine interfaces and artificial skin. Here we report the study of a two-terminal piezotronic transistor based on ZnO twin nanoplatelets (TNPT). Owing to the mirror symmetrical structure of ZnO twin nanplatelet, compressive pressure induced positive piezoelectric polarization charges created at both metal-semiconductor interfaces can simultaneously lower the both Schottky barrier heights and thus significantly modulate the carriers transport...
April 14, 2017: ACS Nano
https://www.readbyqxmd.com/read/28404989/gyrator-based-on-magneto-elastic-coupling-at-a-ferromagnetic-piezoelectric-interface
#19
Swapnil Bhuktare, Arnab Bose, Hanuman Singh, Ashwin A Tulapurkar
A gyrator is a non-reciprocal two port device with 180° phase shift in the transmissions between two ports. Though electromagnetic realizations of gyrators have been well studied, devices based on other forms of interaction are relatively unexplored. Here we demonstrate a device in which signal is transmitted via magneto-elastic coupling, can function as a gyrator. The device is built on a piezoelectric substrate: one port of this device has interdigital transducers (IDTs) and the other port has a periodic array of nickel/gold lines...
April 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28402356/patient-based-comparison-of-traditional-instruments-and-piezoelectric-bone-surgery-in-osseous-resective-surgery
#20
Simone Verardi, Julie Pastagia
Osseous resective surgery has been widely advocated in the treatment of periodontitis. The treatment traditionally has been done with rotary and manual instruments, but piezoelectric devices recently have also been used. A total of 20 adult patients diagnosed with moderate to severe chronic periodontitis were selected. A split-mouth study design was conducted such that one sextant was operated using piezoelectric bone surgery (test) and one with traditional instruments (control) in two separate sessions. Patients were asked to evaluate their perception of cold sensitivity, spontaneous pain, bleeding, swelling, and chewing discomfort...
May 2017: International Journal of Periodontics & Restorative Dentistry
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