Microstructure and properties of Mo-based double-layer MoSi2 thick coating by a new two-step method

2020 ◽  
Vol 394 ◽  
pp. 125840 ◽  
Author(s):  
Rong Pu ◽  
Yanan Sun ◽  
Jiawei Xu ◽  
Xiaojun Zhou ◽  
Shan Li ◽  
...  
Keyword(s):  
Double Layer ◽  
Step Method ◽  
Microstructure And Properties ◽  
Thick Coating

scholarly journals Seven Steps to Reliable Cyclic Voltammetry Measurements for the Determination of Double Layer Capacitance

2021 ◽  
Author(s):  
Dulce M. Morales ◽  
Marcel Risch
Keyword(s):  
Cyclic Voltammetry ◽  
Double Layer ◽  
High Performance ◽  
Electric Circuit ◽  
Precise Determination ◽  
Intrinsic Activity ◽  
Suitable Model ◽  
Double Layer Capacitance ◽  
Step Method

Discovery of electrocatalytic materials for high-performance energy conversion and storage applications relies on the adequate characterization of their intrinsic activity, which is currently hindered by the dearth of a protocol for consistent and precise determination of double layer capacitance (C<sub>DL</sub>). Herein, we propose a seven-step method that aims to determine C<sub>DL</sub> reliably by scan rate-dependent cyclic voltammetry. The method considers three aspects that strongly influence the outcome of the analysis: measurement settings, data collection, and data processing. To illustrate the proposed method, two systems were studied: a resistor-capacitor electric circuit and a glassy carbon disk in an electrochemical cell. With these studies it is demonstrated that when any of the mentioned aspects of the procedure are neglected, substantial deviations of the results are observed with misestimations as large as 61% in the case of the investigated electrochemical system. Moreover, we propose allometric regression as a more suitable model than linear regression for the determination of C<sub>DL</sub> for both the ideal and the non-ideal systems investigated. We stress the importance of assessing the accuracy of not only highly specialized electrochemical methods, but also of those that are well-known and commonly used as it is the case of the voltammetric methods. The methodology proposed herein is not limited to the determination of C<sub>DL</sub>, but can be effectively applied to any other voltammetry-based analysis that aims to deliver quantitative results.

Microstructure and properties of graphite/copper composites fabricated with Cu-Ni double-layer coated graphite powders

2019 ◽  
Vol 27 (5) ◽  
pp. 449-463 ◽  
Author(s):  
Yue Yuan ◽  
Xueping Gan ◽  
Yuanteng Lai ◽  
Qi Zhao ◽  
Kechao Zhou
Keyword(s):  
Double Layer ◽  
Microstructure And Properties

scholarly journals Seven Steps to Reliable Cyclic Voltammetry Measurements for the Determination of Double Layer Capacitance

2020 ◽  
Author(s):  
Dulce M. Morales ◽  
Marcel Risch
Keyword(s):  
Cyclic Voltammetry ◽  
Double Layer ◽  
High Performance ◽  
Electric Circuit ◽  
Precise Determination ◽  
Intrinsic Activity ◽  
Suitable Model ◽  
Double Layer Capacitance ◽  
Step Method

Discovery of electrocatalytic materials for high-performance energy conversion and storage applications relies on the adequate characterization of their intrinsic activity, which is currently hindered by the dearth of a protocol for consistent and precise determination of double layer capacitance (C<sub>DL</sub>). Herein, we propose a seven-step method that aims to determine C<sub>DL</sub> reliably by scan rate-dependent cyclic voltammetry. The method considers three aspects that strongly influence the outcome of the analysis: measurement settings, data collection, and data processing. To illustrate the proposed method, two systems were studied: a resistor-capacitor electric circuit and a glassy carbon disk in an electrochemical cell. With these studies it is demonstrated that when any of the mentioned aspects of the procedure are neglected, substantial deviations of the results are observed with misestimations as large as 61% in the case of the investigated electrochemical system. Moreover, we propose allometric regression as a more suitable model than linear regression for the determination of C<sub>DL</sub> for both the ideal and the non-ideal systems investigated. We stress the importance of assessing the accuracy of not only highly specialized electrochemical methods, but also of those that are well-known and commonly used as it is the case of the voltammetric methods. The methodology proposed herein is not limited to the determination of C<sub>DL</sub>, but can be effectively applied to any other voltammetry-based analysis that aims to deliver quantitative results.

scholarly journals Seven Steps to Reliable Cyclic Voltammetry Measurements for the Determination of Double Layer Capacitance

2020 ◽  
Author(s):  
Dulce M. Morales ◽  
Marcel Risch
Keyword(s):  
Cyclic Voltammetry ◽  
Double Layer ◽  
High Performance ◽  
Electric Circuit ◽  
Precise Determination ◽  
Intrinsic Activity ◽  
Suitable Model ◽  
Double Layer Capacitance ◽  
Step Method

Discovery of electrocatalytic materials for high-performance energy conversion and storage applications relies on the adequate characterization of their intrinsic activity, which is currently hindered by the dearth of a protocol for consistent and precise determination of double layer capacitance (C<sub>DL</sub>). Herein, we propose a seven-step method that aims to determine C<sub>DL</sub> reliably by scan rate-dependent cyclic voltammetry. The method considers three aspects that strongly influence the outcome of the analysis: measurement settings, data collection, and data processing. To illustrate the proposed method, two systems were studied: a resistor-capacitor electric circuit and a glassy carbon disk in an electrochemical cell. With these studies it is demonstrated that when any of the mentioned aspects of the procedure are neglected, substantial deviations of the results are observed with misestimations as large as 61% in the case of the investigated electrochemical system. Moreover, we propose allometric regression as a more suitable model than linear regression for the determination of C<sub>DL</sub> for both the ideal and the non-ideal systems investigated. We stress the importance of assessing the accuracy of not only highly specialized electrochemical methods, but also of those that are well-known and commonly used as it is the case of the voltammetric methods. The methodology proposed herein is not limited to the determination of C<sub>DL</sub>, but can be effectively applied to any other voltammetry-based analysis that aims to deliver quantitative results.

scholarly journals Activated Carbon from Bio-wastes of Durian Fruits as Active Material for Electrodes of Electric Double-layer Capacitors

2015 ◽  
Vol 18 (4) ◽  
pp. 183-191 ◽  
Author(s):  
Jin Pin Tey ◽  
Abdul Kariem Arof ◽  
Mohd Ambar Yarmo ◽  
Mohamed Abdul Careem
Keyword(s):  
Activated Carbon ◽  
Double Layer ◽  
Electrode Material ◽  
Active Material ◽  
Current Collector ◽  
Device Fabrication ◽  
Bet Surface Area ◽  
Step Method ◽  
Polymer Binders ◽  
One Step

In this study, bio-wastes from durian fruits such as seeds and shells have been used as precursor materials to prepare activated carbon (AC). While the applicability of a one-step method of impregnation-activation has been investigated for the activation of durian shells, a two-step method of carbonization-impregnation-activation has been tried for the durian seeds. Durian shells based AC (DSh-AC) was found to have a BET surface area () of 2004 m2 g-1 and the durian seeds based AC (DS-AC) had of 1176 m2 g-1. A new approach to electrical double-layer capacitor (EDLC) fabrication has been attempted to avoid the use of polymer binders and organic solvents in the electrodes by coating the electrode material directly on the separator. Instead of coating onto metal current collector, the AC was coated on a glass microfiber filter which was used as the separator to form the electrode. As an electrode material in the EDLC, DSh-AC performed well with a specific capacitance () between 72 and 82 F g-1 whereas the DS-AC showed lower values of between 64 and 70 F g-1. The reasonable good results indicate that the simple approach of device fabrication can also produce EDLCs with satisfactory performance parameters.

MICROSTRUCTURE AND PROPERTIES OF Al-Li-Cu-Mg-Zr (8090) HEAVY SECTION FORGINGS

1987 ◽  
Vol 48 (C3) ◽  
pp. C3-643-C3-652 ◽  
Author(s):  
R. E. LEWIS ◽  
E. A. STARKE ◽  
Jr. ◽  
W. C. COONS ◽  
G. J. SHIFLET ◽  
...  
Keyword(s):  
Microstructure And Properties ◽  
Heavy Section

Purification of Urokinase from Complex Mixtures Using Immobilized Monoclonal Antibody Against Urokinase Light Chain

1983 ◽  
Vol 49 (01) ◽  
pp. 024-027 ◽  
Author(s):  
David Vetterlein ◽  
Gary J Calton
Keyword(s):  
Monoclonal Antibody ◽  
Light Chain ◽  
Culture Media ◽  
Biological Fluids ◽  
Single Step ◽  
High Yield ◽  
Step Method ◽  
Commercial Preparation ◽  
E Coli ◽  
Tissue Culture Media

SummaryThe preparation of a monoclonal antibody (MAB) against high molecular weight (HMW) urokinase light chain (20,000 Mr) is described. This MAB was immobilized and the resulting immunosorbent was used to isolate urokinase starting with an impure commercial preparation, fresh urine, spent tissue culture media, or E. coli broth without preliminary dialysis or concentration steps. Monospecific antibodies appear to provide a rapid single step method of purifying urokinase, in high yield, from a variety of biological fluids.

NUMERICAL MODEL TO SIMULATE THE EROSION ON THE SLOPE DUE TO OVERTOPPING

2010 ◽  
Vol 13 (3) ◽  
pp. 78-87
Author(s):  
Hoai Cong Huynh
Keyword(s):  
Numerical Model ◽  
Flow Model ◽  
Bed Load ◽  
Experiment Data ◽  
Step Method ◽  
Morphological Model ◽  
Load Transport ◽  
Bed Load Transport ◽  
The Finite Difference Method ◽  
Good Agreement

The numerical model is developed consisting of a 1D flow model and the morphological model to simulate the erosion due to the water overtopping. The step method is applied to solve the water surface on the slope and the finite difference method of the modified Lax Scheme is applied for bed change equation. The Meyer-Peter and Muller formulae is used to determine the bed load transport rate. The model is calibrated and verified based on the data in experiment. It is found that the computed results and experiment data are good agreement.

The Use of Cost-Benefit Analysis for Evaluating Efficiency of Public Investment Projects (The Case of Sochi-2014 Winter Olympic Games)

2011 ◽  
pp. 57-78
Author(s):  
I. Pilipenko
Keyword(s):  
Net Present Value ◽  
Olympic Games ◽  
Cost Benefit Analysis ◽  
Public Investment ◽  
Cost Benefit ◽  
Investment Efficiency ◽  
Benefit Analysis ◽  
Step Method ◽  
Investment Projects ◽  
The Usa

The paper analyzes shortcomings of economic impact studies based mainly on input- output models that are often employed in Russia as well as abroad. Using studies about sport events in the USA and Olympic Games that took place during the last 30 years we reveal advantages of the cost-benefit analysis approach in obtaining unbiased assessments of public investments efficiency; the step-by-step method of cost-benefit analysis is presented in the paper as well. We employ the project of Sochi-2014 Winter Olympic and Paralympic Games in Russia to evaluate its efficiency using cost-benefit analysis for five accounts (areas of impact), namely government, households, environment, economic development, and social development, and calculate the net present value of the project taking into account its possible alternatives. In conclusion we suggest several policy directions that would enhance public investment efficiency within the Sochi-2014 Olympics.

Cracking at the fold in double layer coated paper: the influence of latex and starch composition

TAPPI Journal ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 93-99
Author(s):  
SEYYED MOHAMMAD HASHEMI NAJAFI ◽  
DOUGLAS BOUSFIELD, ◽  
MEHDI TAJVIDI
Keyword(s):  
Mechanical Properties ◽  
Double Layer ◽  
Starch Content ◽  
Single Layer ◽  
Double Layers ◽  
Coated Paper ◽  
Coated Papers ◽  
Coating Layers ◽  
Scanned Images ◽  
Packaging Paper

Cracking at the fold of publication and packaging paper grades is a serious problem that can lead to rejection of product. Recent work has revealed some basic mechanisms and the influence of various parameters on the extent of crack area, but no studies are reported using coating layers with known mechanical properties, especially for double-coated systems. In this study, coating layers with different and known mechanical properties were used to characterize crack formation during folding. The coating formulations were applied on two different basis weight papers, and the coated papers were folded. The binder systems in these formulations were different combinations of a styrene-butadiene latex and mixtures of latex and starch for two different pigment volume concentrations (PVC). Both types of papers were coated with single and double layers. The folded area was scanned with a high-resolution scanner while the samples were kept at their folded angle. The scanned images were analyzed within a constant area. The crack areas were reported for different types of papers, binder system and PVC values. As PVC, starch content, and paper basis weight increased, the crack area increased. Double layer coated papers with high PVC and high starch content at the top layer had more cracks in comparison with a single layer coated paper, but when the PVC of the top layer was low, cracking area decreased. No measurable cracking was observed when the top layer was formulated with a 100% latex layer.

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