A mathematical modelling of multiphysics-based propagation characteristics of surface wave in piezoelectric - hydrogel layer on an elastic substrate
TL;DR: In this paper, a mathematical model of the shear wave propagation in laminated structures (piezoelectric - hydrogel - elastic substrate) using the wave mode method was presented.
About: This article is published in Applied Mathematical Modelling.The article was published on 2022-03-01 and is currently open access. It has received 3 citations till now. The article focuses on the topics: Multiphysics & Materials science.
Citations
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TL;DR: In this article , a composite hydrogel with piezoresistive and piezoelectric sensing for flexible strain sensors is presented, which consists of cross-linked chitosan quaternary ammonium salt (CHACC), poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT: PSS) as the conductive filler, and poly(vinylidene fluoride-co-trifluoroethylene)(PVDF-TrFE)
Abstract: Conductive hydrogels have attracted attention because of their wide application in wearable devices. However, it is still a challenge to achieve conductive hydrogels with high sensitivity and wide frequency band response for smart wearable strain sensors. Here, we report a composite hydrogel with piezoresistive and piezoelectric sensing for flexible strain sensors. The composite hydrogel consists of cross-linked chitosan quaternary ammonium salt (CHACC) as the hydrogel matrix, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT: PSS) as the conductive filler, and poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) as the piezoelectric filler. A one-pot thermoforming and solution exchange method was used to synthesize the CHACC/PEDOT: PSS/PVDF-TrFE hydrogel. The hydrogel-based strain sensor exhibits very high sensitivity (GF: 19.3), fast response (response time: 63.2 ms), and wide frequency range (response frequency: 5-25 Hz), while maintaining excellent mechanical properties (elongation at break up to 293%). It can be concluded that enhanced strain-sensing properties of the hydrogel are contributed to both greater change in the relative resistance under stress and wider response to dynamic and static stimulus by adding PVDF-TrFE. This has a broad application in monitoring human motion, detecting subtle movements, and identifying object contours and a hydrogel-based array sensor. This work provides an insight into the design of composite hydrogels based on piezoelectric and piezoresistive sensing with applications for wearable sensors.
5 citations
TL;DR: In this paper , a finite difference algorithm that evaluates the health conditions of a bonded joint is presented and discussed, paying particular attention to the singularity around the corners of the joint and implementing an original discretisation method of the partial differential equations governing the propagation of the elastic waves.
Abstract: A finite difference algorithm that evaluates the health conditions of a bonded joint is presented and discussed. The mathematical formulation of the problem is developed, paying particular attention to the singularity around the corners of the joint and implementing an original discretisation method of the partial differential equations governing the propagation of the elastic waves. The equations are solved under the only hypothesis of a bidimensional field. The algorithm is sensible to defects in the bonded joint and can be used as an effective structural health monitoring tool, as proven by the experiments that show close agreement with the numerical simulations.
TL;DR: In this article , the authors analyzed the propagation phenomenon of the Rayleigh wave in a piezoelectric-orthotropic substrate under the influence of initial stresses and derived the dispersion equations of the wave propagation on the considered composite structure.
Abstract: The present work analyses the propagation phenomenon of the Rayleigh wave in a piezoelectric-orthotropic substrate beneath a piezoelectric-orthotropic layer under the influence of initial stresses. The dispersion equations of Rayleigh wave propagation on the considered composite structure are obtained by employing suitable non-traditional boundary conditions for electrically open circuits and electrically short circuits. The data of two different PVDF materials have been considered to investigate the latent characteristics of Rayleigh wave propagation in the considered structure. Numerical calculations have been carried out to study the impact of initial stresses on the phase velocity of Rayleigh wave against wave number in all the considered directions of wave propagation for both electrical cases. A comparative study has also been carried out to unfold the impact of initial stresses in all the directions of Rayleigh wave propagation in electrical open- and short-circuit cases and manifested graphically. The obtained result is well-matched with the classical case of the Rayleigh wave for validation and is discussed as one of the problem's special cases. This study may help to improve the design of electrically generating and detecting acoustic devices.
References
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TL;DR: In this article, the linearized theory of elasticity was introduced and the elasticity of a one-dimensional motion of an elastic continuum was modeled as an unbound elastic continuum.
Abstract: Preface Introduction 1 One-dimensional motion of an elastic continuum 2 The linearized theory of elasticity 3 Elastodynamic theory 4 Elastic waves in an unbound medium 5 Plane harmonic waves in elastic half-spaces 6 Harmonic waves in waveguides 7 Forced motions of a half-space 8 Transient waves in layers and rods 9 Diffraction of waves by a slit 10 Thermal and viscoelastic effects, and effects of anisotrophy and non-linearity Author Index Subject Index
4,133 citations
TL;DR: The fabrication of active hydrogel components inside microchannels via direct photopatterning of a liquid phase greatly simplifies system construction and assembly as the functional components are fabricated in situ, and the stimuli-responsive hydrogels components perform both sensing and actuation functions.
Abstract: Hydrogels have been developed to respond to a wide variety of stimuli, but their use in macroscopic systems has been hindered by slow response times (diffusion being the rate-limiting factor governing the swelling process) However, there are many natural examples of chemically driven actuation that rely on short diffusion paths to produce a rapid response It is therefore expected that scaling down hydrogel objects to the micrometre scale should greatly improve response times At these scales, stimuli-responsive hydrogels could enhance the capabilities of microfluidic systems by allowing self-regulated flow control Here we report the fabrication of active hydrogel components inside microchannels via direct photopatterning of a liquid phase Our approach greatly simplifies system construction and assembly as the functional components are fabricated in situ, and the stimuli-responsive hydrogel components perform both sensing and actuation functions We demonstrate significantly improved response times (less than 10 seconds) in hydrogel valves capable of autonomous control of local flow
1,968 citations
TL;DR: A comprehensive overview of the progress that has been made within the context of 1D ZnO nanostructures synthesized via wet chemical methods can be found in this paper, where the synthetic methodologies and corresponding growth mechanisms, different structures, doping and alloying, position-controlled growth on substrates, and finally, their functional properties as catalysts, hydrophobic surfaces, sensors, and in nanoelectronic, optical, optoelectronics, and energy harvesting devices.
Abstract: One-dimensional (1D) ZnO nanostructures have been studied intensively and extensively over the last decade not only for their remarkable chemical and physical properties, but also for their current and future diverse technological applications. This article gives a comprehensive overview of the progress that has been made within the context of 1D ZnO nanostructures synthesized via wet chemical methods. We will cover the synthetic methodologies and corresponding growth mechanisms, different structures, doping and alloying, position-controlled growth on substrates, and finally, their functional properties as catalysts, hydrophobic surfaces, sensors, and in nanoelectronic, optical, optoelectronic, and energy harvesting devices.
1,247 citations
TL;DR: In this paper, a review mainly focuses on the rational synthesis, structure analysis, novel properties and unique applications of zinc oxide nanowires and nanobelts in nanotechnology.
Abstract: Semiconducting zinc oxide nanowires (NWs) and nanobelts (NBs) are a unique group of quasi-one-dimensional nanomaterial. This review mainly focuses on the rational synthesis, structure analysis, novel properties and unique applications of zinc oxide NWs and NBs in nanotechnology. First, we will discuss rational design of synthetic strategies and the synthesis of NWs via vapor phase and chemical growth approaches. Secondly, the vapor–solid process for synthesis of oxide based nanostructures will be described in details. We will illustrate the polar surface dominated growth phenomena, such as the formation of nanosprings, nanorings and nanohelices of single-crystal zinc oxide. Third, we will describe the unique and novel electrical, optoelectronic, field emission, and mechanical properties of individual NWs and NBs. Finally, we will illustrate some novel devices and applications made using NWs as ultra-sensitive chemical and biological nanosensors, solar cell, light emitting diodes, nanogenerators, and nano-piezotronic devices. ZnO is ideal for nanogenerators for converting nano-scale mechanical energy into electricity owing to its coupled piezoelectric and semiconductive properties. The devices designed based on this coupled characteristic are the family of piezotronics, which is a new and unique group of electronic components that are controlled by external forces/pressure.
1,082 citations
TL;DR: In this article, a type of surface wave with no counterpart in a purely elastic homogeneous material is shown to exist in a piezoelectric material and expressions for the velocity of propagation of this wave are obtained for various electrical boundary conditions on the free surface of a half-space.
Abstract: A type of surface wave with no counterpart in a purely elastic homogeneous material is shown to exist in a piezoelectric material Expressions for the velocity of propagation of this wave are obtained for various electrical boundary conditions on the free surface of a piezoelectric half‐space
606 citations