scholarly journals Dielectric Electroactive Polymers with Chemical Pre-Strain: An Experimentally Validated Model

Actuators ◽  
2018 ◽  
Vol 7 (3) ◽  
pp. 50
Author(s):  
Brittany Newell ◽  
Jose Garcia ◽  
Gary Krutz
Keyword(s):  
Smart Materials ◽  
Mechanical Energy ◽  
Electrical Power ◽  
Distinct Group ◽  
Polymer Materials ◽  
Electroactive Polymer ◽  
Step Process ◽  
Multiple Parameters ◽  
Industrial Grade ◽  
One Step

Dielectric electroactive polymer materials represent a distinct group of smart materials that are capable of converting between electrical and mechanical energy. This research focuses on the modeling and testing of an industrial grade fluoropolymer material for its feasibility as a dielectric elastomer electroactive polymer. Through this process, a novel chemical pre-strain method was tested, along with a one-step process for application of pre-strain and addition of an elastomer conductive layer. Modeled and experimental actuators produced approximately 1 mm displacements with 0.625 W of electrical power. The displacement of the actuators was characterized, and the effects of multiple parameters were modeled and analyzed.

A review on electroactive polymers development for aerospace applications

2018 ◽  
Vol 29 (19) ◽  
pp. 3681-3695 ◽  
Author(s):  
Musavir Bashir ◽  
Parvathy Rajendran
Keyword(s):  
Smart Materials ◽  
Electroactive Polymers ◽  
Fast Response ◽  
Polymer Materials ◽  
Electroactive Polymer ◽  
Sensors And Actuators ◽  
Aerospace Applications ◽  
Current Trends ◽  
Potential Applications ◽  
Active Flap

Newfangled smart materials have inspired the researchers to look for more efficient materials that can respond to specific stimuli and retain the original shape. Electroactive polymers are such materials which are capable of sensing and real-time actuation. Various electroactive polymers are excellent candidates due to high strain rate, fast response, reliability and high mechanical compliance despite tough manufacturing. In this study, electroactive polymers are reviewed and the general enabling mechanisms employing their distinct characteristics are presented, and the factors influencing the properties of various electroactive polymers are also discussed. Our study also enumerates the current trends in the development of electroactive polymers along with its progress in aerospace discipline. The electromechanical properties of electroactive polymer materials endow them the capability to work as both sensors and actuators in the field of aerospace. Hence, we provide an overview of various applications of electroactive polymers in aerospace field, notably aircraft morphing. These actuators are vastly used in aerospace applications like Mars Nano-rover, space robotic, flapping wings and active flap. Therefore, the electroactive polymer applications such as effective actuators can be investigated more in their materials, molecular interactions, electromechanics and actuation mechanisms. Considering electroactive polymers unique properties, they will endeavour the great potential applications within aerospace industry.

Study of a magnetic SMA-based energy harvester using a corrugated structure

2021 ◽  
pp. 1045389X2098390
Author(s):  
Omid Safari ◽  
Mohammad Reza Zakerzadeh ◽  
Mostafa Baghani
Keyword(s):  
Smart Materials ◽  
Energy Harvester ◽  
Mechanical Energy ◽  
Electrical Power ◽  
Electrical Energy ◽  
Electrical Current ◽  
Magnetic Shape Memory ◽  
Motion Energy ◽  
Corrugated Beam ◽  
Corrugated Structure

In recent years demand for mobile electrical power has been increased and due to this application, energy harvester systems have been developed to convert mechanical energy into electrical energy using smart materials. In this investigation, a novel arrangement of an energy harvester using Magnetic Shape Memory Alloys (MSMAs) is developed. Elements of MSMA are attached to a corrugated beam and their roots are fixed. The way of harvesting energy from this system is based on conversion of vibration motion energy to the magnetic flux gradient. There is a number of copper coils that wrapped around the MSMA elements in a constant magnetic field. If strain or stress field is applied to the MSMA elements, the electrical current is induced to coils. The problem is studied with analytical methods, and for this purpose, MATLAB solver is used. To simulate the behavior of MSMA substance Kiefer and Lagoudas nonlinear model is used. To verify the results, these two arrangements have been analyzed in ABAQUS. To provide the material properties of MSMA elements, UMAT code has been used. It will be shown that size of this MSMA based energy harvester can become smaller with using corrugated beam structure instead of simple cantilever beam.

Functionalized aluminum-catalyzed silicon nanowire formation and radial junction photovoltaic devices

Nanoscale ◽  
2021 ◽  
Author(s):  
Wipakorn Jevasuwan ◽  
Naoki Fukata
Keyword(s):  
Surface Modification ◽  
Solar Cells ◽  
Surface Defects ◽  
Silicon Nanowire ◽  
Photovoltaic Devices ◽  
Step Process ◽  
One Step ◽  
Length Reduction

Vertical Al-catalyzed SiNW arrays with shaped surfaces were synthesized by a one-step process and NW-based solar cells were demonstrated with optimized NW surface defects through surface modification and length reduction.

scholarly journals Experimental travelling waves identification in mechanical structures

2017 ◽  
Vol 24 (1) ◽  
pp. 152-167
Author(s):  
Izhak Bucher ◽  
Ran Gabai ◽  
Harel Plat ◽  
Amit Dolev ◽  
Eyal Setter
Keyword(s):  
Energy Flux ◽  
Power Flow ◽  
Reactive Power ◽  
Mechanical Energy ◽  
Travelling Waves ◽  
Electrical Power ◽  
Normal Modes ◽  
Standing Waves ◽  
Amplitude Curve ◽  
Physical Point

Vibrations are often represented as a sum of standing waves in space, i.e. normal modes of vibration. While this can be mathematically accurate, the representation as travelling waves can be compact and more appropriate from a physical point of view, in particular when the energy flux along the structure is meaningful. The quantification of travelling waves assists in computing the energy being transferred and propagated along a structure. It can provide local as well as global information about the structure through which the mechanical energy flows. Presented in this paper is a new method to quantify the fraction of mechanical power being transmitted in a vibration cycle at a specific direction in space using measured data. It is shown that the method can detect local defects causing slight non-uniformity of the energy flux. Equivalence is being made with the electrical power factor and electromagnetic standing waves ratio, commonly employed in such cases. Other methods to perform experiment based wave identification in one-dimension are compared with the power flow based identification. Including a signal processing approach that fits an ellipse to the complex amplitude curve and Hilbert transform for obtaining the local phase and amplitude. A new representation of the active and reactive power flow is developed and its relationship to standing waves ratio is demonstrated analytically and experimentally.

MgO nanoparticles synthesized starting from an innovative one-step process

2017 ◽  
Vol 101 (4) ◽  
pp. 1780-1789 ◽  
Author(s):  
Giuliana Taglieri ◽  
Valeria Daniele ◽  
Claudia Mondelli
Keyword(s):  
Mgo Nanoparticles ◽  
Step Process ◽  
One Step

Nanowire Fabrication of Silicon-Based Materials

2007 ◽  
Vol 561-565 ◽  
pp. 1197-1199
Author(s):  
Hideo Kohno ◽  
Seiji Takeda
Keyword(s):  
Electron Microscopy ◽  
Silicon Carbide ◽  
Silicon Germanium ◽  
Iron Silicide ◽  
Growth Mechanisms ◽  
Step Process ◽  
One Step ◽  
Silicon Based

This paper describes our recent achievements in fabricating various kinds of nanowires of silicon-based materials including beta iron-silicide, silicon carbide, and silicon germanium. Some of them can be grown directly at one-step process, while the others can be fabricated using nanowire templates. We discuss their structures, growth mechanisms, and properties based on electron microscopy observations.

scholarly journals Air-gap membrane distillation as a one-step process for textile wastewater treatment

2019 ◽  
Vol 360 ◽  
pp. 1330-1340 ◽  
Author(s):  
Sebastian Leaper ◽  
Ahmed Abdel-Karim ◽  
Tarek A. Gad-Allah ◽  
Patricia Gorgojo
Keyword(s):  
Wastewater Treatment ◽  
Textile Wastewater ◽  
Membrane Distillation ◽  
Air Gap ◽  
Step Process ◽  
Air Gap Membrane Distillation ◽  
One Step ◽  
Textile Wastewater Treatment
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