scholarly journals Dielectric Properties of Textile Materials: Analytical Approximations and Experimental Measurements—A Review

Textiles ◽  
2022 ◽  
Vol 2 (1) ◽  
pp. 50-80
Author(s):  
Yusuke Yamada
Keyword(s):  
Dielectric Properties ◽  
Mixture Theory ◽  
Characterization Methods ◽  
Textile Materials ◽  
Analytical Approximations ◽  
Challenges And Opportunities ◽  
Disciplinary Field ◽  
Combined Features ◽  
Successful Design ◽  
Scientists And Engineers

Deciphering how the dielectric properties of textile materials are orchestrated by their internal components has far-reaching implications. For the development of textile-based electronics, which have gained ever-increasing attention for their uniquely combined features of electronics and traditional fabrics, both performance and form factor are critically dependent on the dielectric properties. The knowledge of the dielectric properties of textile materials is thus crucial in successful design and operation of textile-based electronics. While the dielectric properties of textile materials could be estimated to some extent from the compositional profiles, recent studies have identified various additional factors that have also substantial influence. From the viewpoint of materials characterization, such dependence of the dielectric properties of textile materials have given rise to a new possibility—information on various internal components could be, upon successful correlation, extracted by measuring the dielectric properties. In view of these considerable implications, this invited review paper summarizes various fundamental theories and principles related to the dielectric properties of textile materials. In order to provide an imperative basis for uncovering various factors that intricately influence the dielectric properties of textile materials, the foundations of the dielectrics and polarization mechanisms are first recapitulated, followed by an overview on the concept of homogenization and the dielectric mixture theory. The principal advantages, challenges and opportunities in the analytical approximations of the dielectric properties of textile materials are then discussed based on the findings from the recent literature, and finally a variety of characterization methods suitable for measuring the dielectric properties of textile materials are described. It is among the objectives of this paper to build a practical signpost for scientists and engineers in this rapidly evolving, cross-disciplinary field.

Synthesis and characterizations of metal ions doped barium strontium titanate (BST) nanomaterials for photocatalytic and electrical applications: A mini review

2021 ◽  
Vol 112 (8) ◽  
pp. 665-677
Author(s):  
Kiflom Gebremedhn Kelele ◽  
Aschalew Tadesse ◽  
Tegene Desalegn ◽  
Suresh Ghotekar ◽  
Ruthramurthy Balachandran ◽  
...  
Keyword(s):  
Solid Solution ◽  
Dielectric Properties ◽  
Barium Titanate ◽  
Metal Ions ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Metal Ion ◽  
Dielectric Characteristics ◽  
Characterization Methods ◽  
Barium Strontium

Abstract The ferroelectric barium strontium titanate (Ba1-xSrxTiO3) is a homogeneous solid solution prepared from the mixture of barium titanate (BaTiO3), strontium titanate (SrTiO3) and titanium (IV) isopropoxide. Barium strontium titanate (BST) nanomaterials with improved permittivity and dielectric properties due to their nano-properties have attracted great interest for extensive and versatile applications as super capacitors, dielectrics, ceramics and catalysts. Introduction of metal ion dopants into the parent system of BST significantly alters its structural, morphological, electrical, optical and dielectric characteristics. This review is aimed at addressing synthesis, characterization methods, photocatalytic and electrical applications of metal ions doped BST nanomaterials. The effect of doping BST, through metal ions, on its properties and application with most probable reasons have been thoroughly discussed.

Nanocrystals Technology for Pharmaceutical Science

2018 ◽  
Vol 24 (21) ◽  
pp. 2497-2507 ◽  
Author(s):  
Zhongyao Cheng ◽  
Yumei Lian ◽  
Zul Kamal ◽  
Xin Ma ◽  
Jianjun Chen ◽  
...  
Keyword(s):  
Drug Research ◽  
Poorly Soluble Drugs ◽  
Biochemical Engineering ◽  
Preparation Methods ◽  
Pharmaceutical Science ◽  
Drug Products ◽  
Challenges And Opportunities ◽  
Poorly Soluble ◽  
Scientists And Engineers

Background: Nanocrystals technology is a promising method for improving the dissolution rate and enhancing the bioavailability of poorly soluble drugs. In recent years, it has been developing rapidly and applied to drug research and engineering. Nanocrystal drugs can be formulated into various dosage forms. Objective: This review mainly focused on the nanocrystals technology and its application in pharmaceutical science. Firstly, different preparation methods of nanocrystal technology and the characterization of nanocrystal drugs are briefly described. Secondly, the application of nanocrystals technology in pharmaceutical science is mainly discussed followed by the introduction of sustained release formulations. Then, the scaling up process, marketed nanocrystal drug products and regulatory aspects about nanodrugs are summarized. Finally, the specific challenges and opportunities of nanocrystals technology for pharmaceutical science are summarized and discussed. Conclusion: This review will provide a comprehensive guide for scientists and engineers in the field of pharmaceutical science and biochemical engineering.

scholarly journals Airway-On-A-Chip: Designs and Applications for Lung Repair and Disease

Cells ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1602
Author(s):  
Tanya J. Bennet ◽  
Avineet Randhawa ◽  
Jessica Hua ◽  
Karen C. Cheung
Keyword(s):  
In Vitro Models ◽  
Chronic Obstructive ◽  
Obstructive Pulmonary Disease ◽  
Characterization Methods ◽  
Composition And Structure ◽  
Challenges And Opportunities ◽  
On Chip ◽  
Respiratory Conditions

The lungs are affected by illnesses including asthma, chronic obstructive pulmonary disease, and infections such as influenza and SARS-CoV-2. Physiologically relevant models for respiratory conditions will be essential for new drug development. The composition and structure of the lung extracellular matrix (ECM) plays a major role in the function of the lung tissue and cells. Lung-on-chip models have been developed to address some of the limitations of current two-dimensional in vitro models. In this review, we describe various ECM substitutes utilized for modeling the respiratory system. We explore the application of lung-on-chip models to the study of cigarette smoke and electronic cigarette vapor. We discuss the challenges and opportunities related to model characterization with an emphasis on in situ characterization methods, both established and emerging. We discuss how further advancements in the field, through the incorporation of interstitial cells and ECM, have the potential to provide an effective tool for interrogating lung biology and disease, especially the mechanisms that involve the interstitial elements.

Human Factors in Future Vertical Lift, the U.S. Army’s Next Generation Rotorcraft

2020 ◽  
Vol 64 (1) ◽  
pp. 149-153
Author(s):  
Katie Ernst ◽  
Michael Wilson ◽  
David Durbin ◽  
Roth Roth ◽  
Laura Militello ◽  
...  
Keyword(s):  
Human Factors ◽  
United States Army ◽  
The United States ◽  
Next Generation ◽  
Work Requirements ◽  
Design And Implementation ◽  
Mission Success ◽  
Challenges And Opportunities ◽  
Successful Design ◽  
Vertical Lift

The United States Army is developing and procuring their next generation of rotorcraft, called the Future Vertical Lift (FVL) program. FVL rotorcraft will fly faster and incorporate new work requirements such as command of unmanned systems and optionally piloted variants. Successful design and implementation of human automation teaming will be paramount to the mission success and safety of FVL systems, presenting both challenges and opportunities for human factors personnel supporting FVL development. The purpose of this panel is to highlight the range of human factors challenges within the FVL program. Panelists are drawn from both government and industry, and represent a diverse set of perspectives including user, researcher, and practitioner. The session will include time for panelists to introduce their work and challenges that they are addressing within the FVL program as well as interact with audience members.

A Comprehensive Review of Just Suspended Speed in Liquid-Solid and Gas-Liquid-Solid Stirred Tank Reactors

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Rouzbeh Jafari ◽  
Jamal Chaouki ◽  
Philippe A. Tanguy
Keyword(s):  
Operating Conditions ◽  
Stirred Tank ◽  
Geometrical Parameters ◽  
Optimum Level ◽  
Successful Operation ◽  
Stirred Tank Reactors ◽  
Comprehensive Knowledge ◽  
Solid Suspension ◽  
Successful Design ◽  
Scientists And Engineers

For successful design and operation of Liquid-Solid (LS) and Gas-Liquid-Solid (GLS) stirred tank reactors engineers and scientists must define geometrical and operating conditions for a specific medium (specified physical properties) in such a way that provides the optimum level of solid suspension. Failure to design the stirred tank reactor to achieve optimum conditions and maintain the system at these conditions during operation may be detrimental to product quality (selectivity and yield) and cost. Successful design and operation require comprehensive knowledge about how the state of solid suspension may be affected by changing physical, operational, and geometrical parameters. Also, accurate correlations are necessary to fulfill that objective. This article intends to provide that background for scientists and engineers. It critically surveys the published work in this field and makes specific recommendations for the appropriate conditions that provide the successful operation of agitated vessels.

scholarly journals Three-Phase Borate Solid Solution With Low Sintering Temperature, High Quality Factor, and Low Dielectric Constant: Experimental and DFT Study

2020 ◽  
Author(s):  
Rui Peng ◽  
Hua Su ◽  
Yuanxun Li ◽  
Yongcheng Lu ◽  
Liang Shi ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Solid State Reactions ◽  
Network Analyzer ◽  
First Principles Calculations ◽  
Characterization Methods ◽  
Low Dielectric ◽  
Microwave Dielectric ◽  
Three Phase ◽  
Electron Distributions

Abstract The sintering and microwave dielectric properties of a ceramic material based on Mg2+ substituted Zn3B2O6 have been widely studied using first principles calculations and experimental solid-state reactions. Characterization methods include the Network Analyzer, X-ray, Raman diffraction, scanning electron microscopy, energy-dispersive spectroscopy, and differential-thermal & thermo-mechanical analyzer. The increasing amount of Mg2+ results in the appearance of Mg2B2O5 and ZnO, and the mutual substitution (Mg2+ and Zn2+) phenomenon has emerged in Zn3B2O6 and Mg2B2O5. The mechanisms have been explained with the help of DFT calculations. The bond parameters and electron distributions of the ZnO4 tetrahedron and the MgO6 octahedron have been modified due to substitution. The sintering, substitution, and phase formation properties have been analyzed quantitatively through the energy parameters. The best dielectric properties were obtained for x=0.20 sintered at 950℃, εr=6.47, Q×f=89,600GHz (15.2GHz), τf=-48.6ppm/℃, relative density=96.7%. The substitution of Mg2+ to Zn2+ is a feasible method to improve the microwave dielectric properties of the Zn3B2O6 ceramic.

Sign in / Sign up

Export Citation Format

Share Document