Xem 1-20 trên 42 kết quả Electrochemical process
  • Electrochemistry has been undergoing significant transformations in the last few decades. It is now the province of academics interested only in measuring thermodynamic properties of solutions and of industrialists using electrolysis or manufacturing batteries, with a huge gap between them. It has become clear that these, apparently distinct subjects, alongside others, have a common ground and that they have grown towards each other, particularly as a result of research into the rates of electrochemical processes....

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  • Machining processes produce finished products with a high degree of accuracy and surface quality. Conventional machining utilizes cutting tools that must be harder than the workpiece material. The use of difficult-to-cut materials encouraged efforts that led to the introduction of the nonconventional machining processes that are well-established in modern manufacturing industries.

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  • This book titled "Recent Trend in Electrochemical Science and Technology" contains a selection of chapters focused on advanced methods used in the research area of electrochemical science and technologies; descriptions of electrochemical systems; processing of novel materials and mechanisms relevant for their operation. This book provides an overview on some of the recent development in electrochemical science and technology.

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  • This book introduces some basic and advanced studies on ionic liquids in the electrochemical fi eld. Although ionic liquids are known by only a few scientists and engineers, their applications ’ potential in future technologies is unlimited. There are already many reports of basic and applied studies of ionic liquids as reaction solvents, but the reaction solvent is not the only brilliant future of the ionic liquids. Electrochemistry has become a big fi eld covering several key ideas such as energy, environment, nanotechnology, and analysis.

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  • Introduction: Corrosion can be generally defined as degradation of materials in a reaction between the material and its environment. The nature of the reactions leading to degradation depends on the class of materials: for metals, corrosion is an electrochemical process, whereas ceramics can fail by purely chemical dissolution. This article mainly discusses the corrosion processes of metallic materials, that is, electrochemical corrosion reactions.

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  • Electrical energy plays an important role in our daily life. It can universally be applied and easily be converted into light, heat or mechanical energy. A general problem, however, is that electrical energy can hardly be stored. Capacitors allow its direct storage, but the quantities are small, compared to the demand of most applications. In general, the storage of electrical energy requires its conversion into another form of energy.

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  • Operating Principle: As the tool approaches the work piece it erodes the negative shape of it. Thus complex shapes are made from soft copper metal and used to produce negative duplicates of it. This process is called electrochemical sinking.

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  • According to the definition, electrochemical cells are the devices transferring electrical energy from chemical reactions into electricity, or helping chemical processes through the introduction of electrical energy or electrical field. A common example in this category is battery, which has evolved into a big family and is currently used in all kinds of applications.

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  • In recent years, the awareness of water needs and processing requirement has become an increasingly important topic. As the earth's population increases the demand for "clean" water has become an even larger factor in residential as well as industrial and commercial costs. There are now almost no natural water sources that do not require some purific

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  • Sol-gel process, a most usefully and effectively process, has a lot of advantage for preparation of a variety of advanced materials in various structures and sizes, via polymerization of metal and semiconductor hydroxides or via hydrolysis and condensation of their alkoxides, since in nucleophilic substitution (SN) reaction and nucleophilic addition (AN) reaction, the substituent with thelargest partial negative charge,is the nucleophile, and in SN reactions the substituent with the largest positive charge, + , is theleaving group or nucleofugal.

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  • are not limited to: the wide range of oxidation and reduction reactions possible, the possibility of reaching very high levels of product purity and selectivity, and significantly less energy requirement. The process of electropolymerization leads to simple and reproducible formations of polymer films, which led to a broad material diversity of applications. Nowadays, electrochemistry plays an important role in a wide number of fundamental research and applied areas.

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  • In recent years, great focus has been placed upon polymer thin films. These polymer thin films are important in many technological applications, ranging from coatings and adhesives to organic electronic devices, including sensors and detectors. Polymers can be prepared using chemical and/or electrochemical methods of polymerization. There are a few advantages of electrosynthesis over chemical methods.

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  • Overall structure of electrical power system isin the process of changing. For incremental growth, it is moving away from fossil fuels - major source of energy in the world today - to renewable energy resources that are more environmentally friendly and sustainable [1].

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  • Introduction: The evolution of hydrogen gas at the cathode is one of the reactions most frequently occurring in industrial cells. Besides the obvious case of water electrolyzers, hydrogen evolution occurs at the cathode of chlor-alkali and chlorate cells, which are among the most intensive electrochemical processes. On the other hand, hydrogen liberation is the cathodic process in cells containing aqueous solutions or protonated solvents where the wanted reaction takes place at the anode.

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  • The new edition of Principles of Electrochemistry has been considerably extended by a number of new sections, particularly dealing with 'electrochemical material science' (ion and electron conducting polymers, chemically modified electrodes), photoelectrochemistry, stochastic processes, new aspects of ion transfer across biological membranes, biosensors, etc. In view of this extension of the book we asked Dr Ladislav Kavan (the author of the section on non-electrochemical methods in the first edition) to contribute as a co-author discussing many of these topics.

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  • Double-layer carbon supercapacitors (electrochemical double-layer capacitor (EDLCs)) based on two carbon electrodes of high surface area separated by an electrolyte are the most popular electrochemical supercapacitors. The charge process is electrostatic with charge separation at the two electrode–electrolyte interfaces. The EDLCs can thus be modeled with two capacitances in series with what is called equivalent series resistance (ESR).

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  • Introduction: Most electrochemical reactions take place at the interface of two or more phases. Hence the area of reaction plays a vital role in determining the efficiency of an electrochemical process, just like in any surface reaction. There are several ways to increase the available area for reaction in an electrochemical cell: multiple electrodes are stacked alternatively, bipolar electrodes are used, and, sometimes, the reaction surface is modified by etching or coating with large surface area particles. ...

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  • The book "Developments in Electrochemistry" contains five feature articles in recent advanced electrochemistry. These selected feature articles emphasize physical phenomena rather than mathematical formalisms of electrochemistry.

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  • As the title, “Recent Researches in Metallurgical Engineering, From Extraction to Forming” implies, this text blends new theories with practices covering a broad field of metalrelated technologies including mineral processing, extractive metallurgy, heat treatment and casting. This book is divided into different 5 chapters. Each of the chapters is a review of the research made by the authors during the last decade, and includes references to the research published in scientific papers and conference proceedings by experts in the field....

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  • Asymmetric’ supercapacitors consist of two electrodes that differ considerably in capacitance and utilize different mechanisms for energy storage. The asymmetric concept may employ a faradaic, rechargeable batterytype electrode process at the positive electrode, and a nonfaradaic double-layer capacitance at the negative electrode.

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