scholarly journals Breathable Materials for Triboelectric Effect-Based Wearable Electronics

2018 ◽  
Vol 8 (12) ◽  
pp. 2485 ◽  
Author(s):  
Congju Li ◽  
Ran Cao ◽  
Xiuling Zhang
Keyword(s):  
Recent Progress ◽  
Dielectric Materials ◽  
Wearable Devices ◽  
Wearable Electronics ◽  
Practical Application ◽  
Metal Mesh ◽  
Frictional Materials ◽  
Nanofiber Membranes ◽  
Materials Used ◽  
Triboelectric Effect

Wearable electronics are believed to be the future of the next-generation electric devices. However, the comfort of current wearable devices is greatly limited due to the use of airtight materials, which may even lead to inflammation of the skin. Therefore, breathable, skin-friendly materials, are highly desired for wearable devices. Here, the recent progress of the breathable materials used to fabricate skin-friendly electronics is reviewed by taking triboelectric effect-based wearable electronics as a typical example. Fibers, yarns, textiles, and nanofiber membranes are the most popular dielectric materials that serve as frictional materials. Metal mesh, silver yarn, and conductive networks made up of nanomaterial are preferred as air-permissive electrodes. The breathable materials for skin-friendly wearable electronics summarized in this review provide valuable references for future fabrication of humanized wearable devices and hold great significance for the practical application of wearable devices.

scholarly journals Análise de revestimento dielétrico de um sensor UHF de microfita aplicado na detecção de descargas parciais em transformadores de potência

2019 ◽  
Vol 1 (47) ◽  
pp. 214
Author(s):  
Marcus Vinícius Dantas de Aquino ◽  
Alex Jean René Serres ◽  
Edson Guedes da Costa ◽  
George Victor Rocha Xavier ◽  
Luiz Augusto Medeiros Martins Nobrega ◽  
...  
Keyword(s):  
Electrical Equipment ◽  
Dielectric Materials ◽  
Microstrip Antennas ◽  
Practical Application ◽  
Different Types ◽  
Electromagnetic Shield ◽  
Great Relevance ◽  
Electromagnetic Characteristics ◽  
Materials Used ◽  
Do So

<p class="Normal1">The use of UHF sensors in high voltage electrical equipment for monitoring its insulation system is widely used. In order to improve these sensors,we present an analysis of different types of dielectric materials that can be used as physical coating and shield, which can enhance the electromagnetic characteristics of UHF microstrip sensors applied to the detection of partial discharges in performance transformers. The materials used as coating were glass, silicone, FR4, Teflon, and acrylic. In order to do so,, HFSS software simulations for the development of analyzes on two UHF microstrip antennas were performed. From the analyzes performed, it was verified the improvement of the reflection coefficient and the gain of the UHF sensor recorded the materials used to demonstrate the practical application. In addition to that, we also had simulations of a typical electromagnetic shield applied in conjunction with the sensor to demonstrate that the shield is still displayed in the design stages and is of great relevance. In order to underpin the data obtained from the simulations, the real models of UHF sensors were applied and tested in the laboratory.</p>

Surface flashover of dielectric materials used in pulsed power research

2007 ◽  
Author(s):  
M.P. Wilson ◽  
R.A. Fouracre ◽  
M.J. Given ◽  
S.J. MacGregor ◽  
I.V. Timoshkin ◽  
...  
Keyword(s):  
Dielectric Materials ◽  
Pulsed Power ◽  
Surface Flashover ◽  
Materials Used

Dielectric materials for electrolyte gated transistor applications

2021 ◽  
Author(s):  
Wei Huang ◽  
Jianhua Chen ◽  
Gang Wang ◽  
Yao Yao ◽  
Xinming Zhuang ◽  
...  
Keyword(s):  
Recent Progress ◽  
Dielectric Materials

In this review, we summarize recent progress in developing dielectric materials for electrolyte gated transistors (EGTs). Semiconductors for EGTs have been extensively studied and reviewed since they dominate the key...

scholarly journals The environmental navigation using geometric virtual reality

2018 ◽  
Vol 10 (6) ◽  
pp. 168781401878363 ◽  
Author(s):  
Nien-Tsu Hu ◽  
Pu-Sheng Tsai ◽  
Ter-Feng Wu ◽  
Jen-Yang Chen ◽  
Lin Lee
Keyword(s):  
Virtual Reality ◽  
System Architecture ◽  
Three Dimensional ◽  
Wearable Devices ◽  
Wireless Transmission ◽  
Wearable Electronics ◽  
Virtual Reality Environment ◽  
Landscape Models ◽  
Three Dimensional Models ◽  
Animation Software

This article explores the construction of a geometric virtual reality platform for the environmental navigation. Non-panoramic photos and wearable electronics with Bluetooth wireless transmission functions are used to combine the user’s actions with the virtual reality environment in a first-person virtual reality platform. The 3ds Max animation software is used to create three-dimensional models of real buildings. These models are combined with the landscape models in Unity3d to create a virtual campus scene that matches real landscape. The wearable device included an ATMega168 chip as a microcontroller; it was connected to a three-axis accelerometer, a gyroscope, and a Bluetooth transmitter to detect and transmit various movements of the user. Although the development of the mechatronics, software, and engineering involved in the three-dimensional animation are the main objective, we believe that the methods and techniques can be modified for various purposes. After the system architecture was created and the operations of the platform were verified, wearable devices and virtual reality scenes are concluded to be able to be used together seamlessly.

scholarly journals Human Machine and Thermoelectric Energy Scavenging for Wearable Devices

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Vladimir Leonov
Keyword(s):  
Thermal Properties ◽  
Heat Flow ◽  
Thermal Resistance ◽  
Wearable Devices ◽  
The Body ◽  
Energy Scavenging ◽  
Wearable Electronics ◽  
Ambient Temperatures ◽  
Thermoelectric Energy ◽  
Temperature Heat

Thermal properties of humans were studied in the case where a small-size energy scavenger is placed on the body. In such a case, the human being serves as a heat source for the thermopile of the scavenger, but the latter serves as a thermally insulating object. As a result, the body properties, namely, the skin temperature, heat flow, and thermal resistance locally change. This is the result of redirection of heat flow inside the body to colder zones because of thermal insulation provided by the scavenger. Increased thermal resistance of human body, in turn, affects the design of the scavenger. The analysis of such scavenger performed for ambient temperatures of 0°C to 25°C shows that it could reach competitive performance characteristics and replace batteries in low-power wearable electronics. A simulated power of up to 60 μW/cm2 at 0°C has been validated by using wearable thermoelectric modules.

LOW LOSS DIELECTRIC MATERIALS FOR HIGH FREQUENCY APPLICATIONS

2009 ◽  
Vol 23 (17) ◽  
pp. 3649-3654 ◽  
Author(s):  
MOHAN V. JACOB
Keyword(s):  
High Frequency ◽  
Room Temperature ◽  
Low Cost ◽  
Dielectric Materials ◽  
Dielectric Constants ◽  
Transmission Losses ◽  
Low Loss ◽  
Microwave Characterization ◽  
Materials Used ◽  
Low Temperature Electronics

The microwave properties of some of the low cost materials which can be used in high frequency applications with low transmission losses are investigated in this paper. One of the most accurate microwave characterization techniques, Split Post Dielectric Resonator technique (SPDR) is used for the experimental investigation. The dielectric constants of the 3 materials scrutinized at room temperature and at 10K are 3.65, 2.42, 3.61 and 3.58, 2.48, 3.59 respectively. The corresponding loss tangent values are 0.00370, 0.0015, 0.0042 and 0.0025, 0.0009, 0.0025. The high frequency transmission losses are comparable with many of the conventional materials used in low temperature electronics and hence these materials could be implemented in such applications.

Recent Progress in Disposable Ion-Selective Sensors for Environmental Applications

2012 ◽  
Vol 77 ◽  
pp. 65-70 ◽  
Author(s):  
Giusy Matzeu ◽  
Claudio Zuliani ◽  
Dermot Diamond
Keyword(s):  
Film Thickness ◽  
Recent Progress ◽  
Low Cost ◽  
Contact Layer ◽  
Ion Selective Electrodes ◽  
Complex Relationship ◽  
Solid Contact ◽  
Materials Used ◽  
Deposition Techniques

Solid-contact Ion Selective Electrodes (SC-ISEs) for the detection of lead are prepared on screen printed substrates in order to have low-cost and disposable sensors which may be useful in long-term environmental monitoring. It is shown that the materials used as solid contact layer, the deposition techniques and their thickness affect greatly the performances of the sensors. Poly(3-octylthiophene-2,5-diyl) (POT) and poly-3,4-ethylenedioxithiophene (PEDOT) are employed in this investigation. A trend showing an optimum is found for sensors prepared with POT as the batch reproducibility depends on the amount drop-cast, i.e., thickness. In case of PEDOT which is grown amperometrically the trend is more complex but an optimum for the batch reproducibility is again found depending on the current density. In the latter case, the film thickness and the overoxidation degree of the polymer probably concur in determining a more complex relationship.

scholarly journals Reducing the Susceptibility of Lumped-Element KIDs to Two-Level System Effects

2020 ◽  
Vol 200 (5-6) ◽  
pp. 239-246
Author(s):  
A. L. Hornsby ◽  
P. S. Barry ◽  
S. M. Doyle ◽  
Q. Y. Tang ◽  
E. Shirokoff
Keyword(s):  
Dielectric Materials ◽  
Kinetic Inductance Detectors ◽  
Kinetic Inductance ◽  
Noise Power ◽  
Microwave Background ◽  
Superconducting Resonators ◽  
Lumped Element ◽  
Noise Power Spectral Density ◽  
Power Spectral ◽  
Materials Used

Abstract Arrays of lumped-element kinetic inductance detectors (LEKIDs) optically coupled through an antenna-coupled transmission line are a promising candidate for future cosmic microwave background experiments. However, the dielectric materials used for the microstrip architecture are known to degrade the performance of superconducting resonators. In this paper, we investigate the feasibility of microstrip coupling to a LEKID, focusing on a systematic study of the effect of depositing amorphous silicon nitride on a LEKID. The discrete and spatially separated inductive and capacitive regions of the LEKID allow us to vary the degree of dielectric coverage and determine the limitations of the microstrip coupling architecture. We show that by careful removal of dielectric from regions of high electric field in the capacitor, there is minimal degradation in dielectric loss tangent of a partially covered lumped-element resonator. We present the effects on the resonant frequency and noise power spectral density and, using the dark responsivity, provide an estimate for the resulting detector sensitivity.

scholarly journals Activated persulfate by iron-based materials used for refractory organics degradation: a review

2020 ◽  
Vol 81 (5) ◽  
pp. 853-875 ◽  
Author(s):  
Yanjiao Gao ◽  
Pascale Champagne ◽  
David Blair ◽  
Ouwen He ◽  
Tiehong Song
Keyword(s):  
Transition Metals ◽  
Advanced Oxidation Processes ◽  
Ferric Iron ◽  
Operating Conditions ◽  
Zero Valent Iron ◽  
Practical Application ◽  
Treatment Research ◽  
Iron Based ◽  
Materials Used ◽  
Refractory Organics

Abstract Recently, the advanced oxidation processes (AOPs) based on sulfate radicals (SRs) for organics degradation have become the focus of water treatment research as the oxidation ability of SRs are higher than that of hydroxyl radicals (HRs). Since the AOP-SRs can effectively mineralize organics into carbon dioxide and water under the optimized operating conditions, they are used in the degradation of refractory organics such as dyes, pesticides, pharmaceuticals, and industrial additives. SRs can be produced by activating persulfate (PS) with ultraviolet, heat, ultrasound, microwave, transition metals, and carbon. The activation of PS in iron-based transition metals is widely studied because iron is an environmentally friendly and inexpensive material. This article reviews the mechanism and application of several iron-based materials, including ferrous iron (Fe2+), ferric iron (Fe3+), zero-valent iron (Fe0), nano-sized zero-valent iron (nFe0), materials-supported nFe0, and iron-containing compounds for PS activation to degrade refractory organics. In addition, the current challenges and perspectives of the practical application of PS activated by iron-based systems in wastewater treatment are analyzed and prospected.

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