The Experts below are selected from a list of 144 Experts worldwide ranked by ideXlab platform
Meinhard Knoll - One of the best experts on this subject based on the ideXlab platform.
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Electrolyte Supply and modelling of electrochemical nanofilm processors
Sensors and Actuators B: Chemical, 2017Co-Authors: Christian Schoo, Meinhard KnollAbstract:Abstract The controlled lateral oxidation of nanoscale aluminum layer in nanofilm processors is a new type of electrochemical device providing application for a large variety of smart labels. For this device based on an electrochemical cell the Electrolyte function is realized by a thin layer containing a hygroscopic agent harvesting water from the ambient atmosphere necessary for the electrochemical process inside the device. The fundamental experimental principle of Supplying a nanofilm processor by water harvesting from the ambient atmosphere in thin Electrolyte layer is actually shown in previous paper. In this paper we have a closer view on the volume flows and develop a model describing the occurring volume flows in the Electrolyte layer as transfer unit for water from the ambient vapor phase into the nanofilm processor. Based on this model we optimized the Electrolyte layer technically to achieve a distinctive improvement of the feeding performance of the nanofilm processor especially under deficit condition concerning the ambient humidity.
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Modulation of oxidation velocity in nanofilm processors by in situ Electrolyte feeding
Electrochimica Acta, 2016Co-Authors: Christian Schoo, Meinhard KnollAbstract:Abstract Highly accelerated lateral oxidation of the aluminum layer in a nanofilm processor may be achieved using an Electrolyte Supply distributed above the aluminum layer. Localized addition of Electrolyte avoids the limitation of lateral oxidation due to the length-dependent increase in hydraulic resistance of the Electrolyte channel. Lateral oxidation velocities in the new devices were 25 to 30 mm per day compared to 5 to 10 mm/day in the classical nanofilm processor. We developed a model to describe the experimental results and successfully predict the lateral oxidation behavior following modifications to the experimental setup.
Christian Schoo - One of the best experts on this subject based on the ideXlab platform.
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Electrolyte Supply and modelling of electrochemical nanofilm processors
Sensors and Actuators B: Chemical, 2017Co-Authors: Christian Schoo, Meinhard KnollAbstract:Abstract The controlled lateral oxidation of nanoscale aluminum layer in nanofilm processors is a new type of electrochemical device providing application for a large variety of smart labels. For this device based on an electrochemical cell the Electrolyte function is realized by a thin layer containing a hygroscopic agent harvesting water from the ambient atmosphere necessary for the electrochemical process inside the device. The fundamental experimental principle of Supplying a nanofilm processor by water harvesting from the ambient atmosphere in thin Electrolyte layer is actually shown in previous paper. In this paper we have a closer view on the volume flows and develop a model describing the occurring volume flows in the Electrolyte layer as transfer unit for water from the ambient vapor phase into the nanofilm processor. Based on this model we optimized the Electrolyte layer technically to achieve a distinctive improvement of the feeding performance of the nanofilm processor especially under deficit condition concerning the ambient humidity.
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Modulation of oxidation velocity in nanofilm processors by in situ Electrolyte feeding
Electrochimica Acta, 2016Co-Authors: Christian Schoo, Meinhard KnollAbstract:Abstract Highly accelerated lateral oxidation of the aluminum layer in a nanofilm processor may be achieved using an Electrolyte Supply distributed above the aluminum layer. Localized addition of Electrolyte avoids the limitation of lateral oxidation due to the length-dependent increase in hydraulic resistance of the Electrolyte channel. Lateral oxidation velocities in the new devices were 25 to 30 mm per day compared to 5 to 10 mm/day in the classical nanofilm processor. We developed a model to describe the experimental results and successfully predict the lateral oxidation behavior following modifications to the experimental setup.
Jie Cheng - One of the best experts on this subject based on the ideXlab platform.
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Study on Electrolyte Supply strategy for energy storage system of multi zinc nickel single flow battery stack loaded with single pump
Journal of Energy Storage, 2021Co-Authors: Shouguang Yao, Xiaofei Sun, Xiaoxu Yang, Rui Zhou, Jie ChengAbstract:Abstract Zinc nickel single flow battery (ZNB) has the advantages of low cost, low toxicity and long life, which is considered as one of the ideal choices for large-scale fixed energy storage. The efficient operation of ZNB is a necessary condition for maximizing system efficiency and safe operation. In this paper, a dynamic model of ZNB of single pump loaded with multi stack considering electrochemical reaction, mass transfer and hydraulic loss is constructed. Based on the principle of minimizing charging energy and maximizing discharge energy, the effects of Electrolyte flow rate and current density on potential window and morphology of zinc deposition are considered, an adaptively adjusted Electrolyte flow Supply scheme is proposed. By considering the effect of flow rate on zinc deposition, the optimized Electrolyte Supply strategy can not only improve the system efficiency, but also effectively extend the service life of ZNB.
J. A. González - One of the best experts on this subject based on the ideXlab platform.
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influence of the degree of pore saturation on the resistivity of concrete and the corrosion rate of steel reinforcement
Cement and Concrete Research, 1993Co-Authors: W. López, J. A. GonzálezAbstract:Abstract Quantitative relations between the corrosion rate of reinforcements (i corr ) and the degree of pore saturation (PS) and resistivity ( ϱ ) of mortars without Cl − and with 2% Cl − were obtained. The mortar specimens were cured in a water fog chamber before the final exposure at 50°C and 50% relative humidity (RH). The Electrolyte Supply was found to determined the mortar resistivity which varies over a wide range (5 × 10 3 −5 × 10 7 ωcm) and this in turn influences the i corr of the reinforcements. There is a critical practical PS value (PS cp ) that results in a mortar resistivity of 10 5 ωcm, below which i corr values are too small to pose any durability problems. Below the PS cp value, the resistivity of the mortar prevents active state corrosion of reinforcements as effectively as passivating layers of steel in mortars without Cl − .
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Effects of Moisture Availability on Corrosion Kinetics of Steel Embedded in Concrete
CORROSION, 1993Co-Authors: J. A. González, W. López, P. RodríguezAbstract:Abstract The quantitative relations between the corrosion rate (in terms of the corrosion current density, Icorr) of steel in concrete and the Electrolyte Supply was studied. The degree of pore saturation of concrete determined the type of natural control of the corrosion kinetics of the embedded steel. Corrosion of steel in atmosphere and in concrete in an active state conformed to a semi-logarithmic relationship between Icorr and the relative humidity (RH) of the atmosphere or the degree of pore saturation of the concrete. The latter variable dictated resistivity of the concrete. However, once corrosion at a steel-concrete interface started, it was found that the concrete cover could be detrimental to the corrosion process of the embedded steel. The porous nature of the concrete resulted in longer wetting times than bare steel surfaces.
Rolf Wüthrich - One of the best experts on this subject based on the ideXlab platform.
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Designing a SACE Micromachining Set-up
Micromachining Using Electrochemical Discharge Phenomenon, 2015Co-Authors: Rolf WüthrichAbstract:The chapter provides guidelines and design rules for the construction of a micromachining facility based on electrochemical discharges. It focuses on the specific characteristics of the spark-assisted chemical engraving (SACE) process, and also discusses some general practical aspects. A SACE micromachining facility is composed of four main elements—electrodes, processing cell, power Supply, and positioning system. Depending on the application more components can be added, such as various sensors or Electrolyte Supply systems. The machining takes place in the processing cell. Its main function is to hold the workpiece and the Electrolyte. Care should be taken in order to use a geometry in which the Electrolyte level can be controlled by some means. The processing cell should be made of a chemically inert material. Plexiglas is a good choice as it is transparent, which facilitates the observation of the machining process. The cell should be designed to minimize projection of the Electrolyte on the other parts of the set-up.
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Chapter 8 – Designing a SACE Micromachining Set-up
Micromachining Using Electrochemical Discharge Phenomenon, 2009Co-Authors: Rolf WüthrichAbstract:Publisher Summary The chapter provides guidelines and design rules for the construction of a micromachining facility based on electrochemical discharges. It focuses on the specific characteristics of the spark-assisted chemical engraving (SACE) process, and also discusses some general practical aspects. A SACE micromachining facility is composed of four main elements—electrodes, processing cell, power Supply, and positioning system. Depending on the application more components can be added, such as various sensors or Electrolyte Supply systems. The machining takes place in the processing cell. Its main function is to hold the workpiece and the Electrolyte. Care should be taken in order to use a geometry in which the Electrolyte level can be controlled by some means. The processing cell should be made of a chemically inert material. Plexiglas is a good choice as it is transparent, which facilitates the observation of the machining process. The cell should be designed to minimize projection of the Electrolyte on the other parts of the set-up.