scholarly journals The estimation of solid copper surface tension in copper sulfate solutions

2002 ◽  
Vol 67 (11) ◽  
pp. 769-775 ◽  
Author(s):  
Konstantin Popov ◽  
Nebojsa Nikolic ◽  
Zlatko Rakocevic
Keyword(s):  
Surface Tension ◽  
Specific Surface ◽  
Copper Sulfate ◽  
Current Density ◽  
Density Range ◽  
Sulfate Solutions ◽  
Current Density Range ◽  
The Difference ◽  
Limiting Diffusion Current ◽  
Solid Copper

In metal electrodeposition in the limiting diffusion current density range the deposition current density remains constant regardless of the deposition overpotential used. At the same time, the larger the deposition overpotential is the more disperse is the formed deposit, which is characterised by an increased specific surface. The difference in the specific surface of disperse deposits obtained at two different overpotentials in the limiting diffusion current density range is correlated with the difference between the deposition overpotentials. A method for the estimation of the surface tension of solid copper in copper sulfate solutions is also proposed.

Graphene anchored on Cu foam as a lithiophilic 3D current collector for a stable and dendrite-free lithium metal anode

2018 ◽  
Vol 6 (21) ◽  
pp. 9899-9905 ◽  
Author(s):  
Guanhui Yang ◽  
Jiadong Chen ◽  
Peitao Xiao ◽  
Phillips O. Agboola ◽  
Imran Shakir ◽  
...  
Keyword(s):  
Current Density ◽  
Current Collector ◽  
Host Material ◽  
Density Range ◽  
Lithium Metal ◽  
Metal Anode ◽  
Lithium Metal Anode ◽  
Current Density Range ◽  
Stable Performance ◽  
Cu Foam

GN@Cu foam serves as a lithiophilic host material for Li anode, showing dendrite-free morphology and stable performance over a wide current density range.

scholarly journals Variable-temperature characterization of NbTi strands in the low critical-current density range

2008 ◽  
Vol 97 ◽  
pp. 012306 ◽  
Author(s):  
L Affinito ◽  
S Chiarelli ◽  
V Corato ◽  
A della Corte ◽  
G De Marzi ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Variable Temperature ◽  
Density Range ◽  
Current Density Range

Time Dependent Fluorescence Spectrum of an e-Beam Pumped KrF Laser Medium in a High Current Density Range

1980 ◽  
Vol 19 (5) ◽  
pp. L241-L244 ◽  
Author(s):  
Hideo Hara ◽  
Nobuhiko Umezu ◽  
Kazuko Umezu ◽  
Hiroshi Takuma ◽  
Susumu Namba
Keyword(s):  
Fluorescence Spectrum ◽  
Current Density ◽  
High Current Density ◽  
Time Dependent ◽  
Laser Medium ◽  
Density Range ◽  
High Current ◽  
Current Density Range ◽  
Krf Laser

CATHODIC POLARIZATION OF SILVER IN SULPHURIC ACID

1959 ◽  
Vol 37 (1) ◽  
pp. 222-227 ◽  
Author(s):  
A. A. Antoniou ◽  
F. E. W. Wetmore
Keyword(s):  
Sulphuric Acid ◽  
Current Density ◽  
Cathodic Polarization ◽  
Density Range ◽  
Current Density Range ◽  
Symmetry Factor ◽  
Tafel Slopes ◽  
Silver Cathodes ◽  
Hydrogen Overpotential ◽  
A Current

The hydrogen overpotential on fine silver cathodes has been determined from 2 to 35° and over a current density range from 0.03 to 2000 μa cm−2. Two Tafel slopes were observed, RT/F at low currents, 2RT/F at high currents. The stoichiometric number was found to be one and the symmetry factor one-half at low currents. The heat of activation changed from 18.8 kcal at low currents to 14.3 at high currents.

scholarly journals An Electrodeposition Process for Producing Ductile Bulk Nanocrystalline Ni–Fe Alloys in a Wide Current Density Range

2018 ◽  
Vol 59 (8) ◽  
pp. 1354-1358 ◽  
Author(s):  
Isao Matsui ◽  
Mizuki Kanetake ◽  
Hiroyuki Hosokawa ◽  
Naoki Omura ◽  
Yorinobu Takigawa ◽  
...  
Keyword(s):  
Current Density ◽  
Density Range ◽  
Electrodeposition Process ◽  
Current Density Range ◽  
Fe Alloys ◽  
Bulk Nanocrystalline

High Temperature Electrochemical Synthesis of Tungsten Boride from Molten Salt

2011 ◽  
Vol 306-307 ◽  
pp. 463-466 ◽  
Author(s):  
Xiao Zhou Cao ◽  
Hui Ying Wang ◽  
Xi Meng ◽  
Chao Wang ◽  
He Yang ◽  
...  
Keyword(s):  
Particle Size ◽  
Phase Composition ◽  
High Temperature ◽  
Current Density ◽  
Electrochemical Synthesis ◽  
Density Range ◽  
Current Density Range ◽  
Particle Size And Morphology ◽  
Tungsten Boride ◽  
Size And Morphology

High temperature electrochemical synthesis of tungsten boride has been performed in KF-KCl melts with B2O3 and WO3 used as reactants at 1033K. The cathode product was investigated in the current density range 0.4A/cm2-0.6A/cm2 and characterized by means of XRD analyses and SEM. The results indicated that cathode product is mainly consist of W2B5 and WB4, the powders are fine (＜0.5um). Current density exert a great effect on the phase composition, particle size and morphology of the cathode product.

A broad parameter range for selective methane production with bicarbonate solution in electrochemical CO2 reduction

2017 ◽  
Vol 1 (8) ◽  
pp. 1734-1739 ◽  
Author(s):  
Hiroshi Hashiba ◽  
Hiroki K. Sato ◽  
Satoshi Yotsuhashi ◽  
Katsushi Fujii ◽  
Masakazu Sugiyama ◽  
...  
Keyword(s):  
Current Density ◽  
Methane Production ◽  
Co2 Reduction ◽  
Parameter Range ◽  
Density Range ◽  
Current Density Range ◽  
Electrochemical Co2 Reduction

Selective methane production was achieved over a broad current density range with 0.5 M KHCO3 solution and bulk, polycrystalline Cu.

scholarly journals The influence of structural changes on electrical and magnetic characteristics of amorphous powder of the nixmoy alloy

2006 ◽  
Vol 38 (2) ◽  
pp. 145-153 ◽  
Author(s):  
Lenka Ribic-Zelenovic ◽  
L. Rafailovic ◽  
M. Spasojevic ◽  
A. Maricic
Keyword(s):  
Chemical Composition ◽  
Curie Temperature ◽  
Current Density ◽  
Magnetic Permeability ◽  
Structural Changes ◽  
Molybdenum Content ◽  
Density Range ◽  
Current Density Range ◽  
Powder Samples ◽  
Amorphous Powders

Nickel and molybdenum alloy powder was electrodeposited on a titanium cathode from a NiSO4?7H2O and (NH4)6 Mo7O24?4H2O ammonium solution. The desired chemical composition, structure, size and shape of particles in the powder samples were achieved by an appropriate choice of electrolysis parameters (current density, composition and temperature of the solution, cathode material and electrolysis duration). Metal coatings form in the current density range 15 mA cm-2<j<30 mA cm-2. If the current density is greater than 40mA cm-2 then powders form. The chemical composition of powder samples depends on the current density of electrodeposition. The molybdenum content in the powder increases with the increase of current density (in the low current density range), while in the higher current density range the molybdenum content in the alloy decreases with the increase of the current density of deposition. Smaller sized particles form at higher current density. X-ray analysis, differential scanning calorimetric and measurements of the temperature dependence of electric resistance and magnetic permeability of the powder samples were all used to establish a predominantly amorphous structure of the powder samples formed at the current density of j?70mA cm-2. The crystalline particle content in the powder samples increases with the decrease of the current density of deposition. Powder heating causes structural changes. The process of thermal stabilization of nickel and molybdenum amorphous powders takes place in the temperature interval from 463K to 573K and causes a decrease in electrical resistance and increase in magnetic permeability. The crystallization temperature depends on the value of current density of powder electrodeposition. Powder formed at j=180 mA cm-2 begins to crystallize at 573K, while the powder deposited at j=50 mA cm-2 begins to crystallize at 673K. Crystallization of the powder causes a decrease in electric resistivity and magnetic permeability. The Curie temperature of the crystallized powders is about 10 K higher than the Curie temperature of amorphous powders.

FORMALIZATION OF THE CONCEPT OF A SLIT CAPILLARY TAKING INTO ACCOUNT THE CONTACT ANGLE OF WETTING

2020 ◽  
Author(s):  
В.Г. ЖУКОВ ◽  
В.М. ЧЕСНОКОВ ◽  
Н.Д. ЛУКИН
Keyword(s):  
Surface Tension ◽  
Porous Media ◽  
Specific Surface ◽  
Transverse Section ◽  
Pore Space ◽  
Size Limit ◽  
Edge Angle ◽  
Annular Section ◽  
The Difference ◽  
Capillary Size

Расчеты процессов распределения и переноса жидкости в пористых средах осуществляют, принимая во внимание ее капиллярные свойства в поровом пространстве. С учетом выведенной нами ранее расчетной формулы для предельного размера капилляра с круглым поперечным сечением, краевого угла смачивания и параметра удельного поверхностного натяжения получена расчетная формула предельного размера для капилляров с щелевым и кольцевым сечением. Установлено, что полученные расчетные формулы предельных размеров для трубчатых капилляров щелевого плоского и кольцевого сечения с учетом краевого угла смачивания идентичны. Отличие формул для капилляров с щелевым и кольцевым сечением от формулы для капилляра круглого поперечного сечения определено только функцией, зависящей от краевого угла смачивания. Значения предельных размеров капилляров с щелевым сечением на 10–17,5% меньше, чем капилляра с круглым сечением. Поверхность отклика позволила оценить влияние удельного поверхностного натяжения и функции краевого угла смачивания на изменение величины предельного размера капилляров. Результаты исследований могут быть использованы для повышения эффективности расчетов тепломассообмена в пористых средах в пищевых производствах и других аналогичных задач. The calculations of the processes of saturation and transfer of fluid in porous media are based on taking into account of its capillary properties in the pore space. Given our previously derived formulas for the maximum amount of capillary with a circular transverse section, wetting angle and parameter specific surface tension obtained calculation formula size limit for capillaries with a slit and annular transverse section. It is established that the obtained calculation formulas of the limit sizes for tubular capillaries of slotted flat and annular section with the account of the wetting edge angle are identical. The difference between the formulas for capillaries with slotted and annular section and the formula for a capillary with a circular transverse section is determined only by a function that depends on the wetting edge angle. The values of the limit sizes of capillaries with a slotted transverse section are 10–17,5% less than those of a capillary with a circular transverse section. The response surface allowed us to evaluate the effect of specific surface tension and the function of the wetting edge angle on the change in the capillary size limit. The research results can be used to improve the efficiency of calculations of heat and mass transfer in porous media in food production and other similar tasks.

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