Epoxy Adhesion to Copper, Part II: Electrochemical Pretreatment

1984 ◽  
pp. 523-540 ◽  
Author(s):  
Jae M. Park ◽  
James P. Bell
Keyword(s):  
Electrochemical Pretreatment

Improving the Performance of Platinum Nanocrystal Catalysts by Square-wave Potential Electrochemical Pretreatment

Fuel Cells ◽  
2010 ◽  
Vol 10 (3) ◽  
pp. 384-389 ◽  
Author(s):  
L. Zheng ◽  
J. Sun ◽  
L. Xiong ◽  
R. Jin ◽  
J. Li ◽  
...  
Keyword(s):  
Square Wave ◽  
Wave Potential ◽  
Electrochemical Pretreatment

Effects of Two-Step DC Electrochemical Pretreatment of Fine Grinding WC-Co Tool Surface on Morphology and Quality of Diamond Coatings

2011 ◽  
Vol 337 ◽  
pp. 59-62
Author(s):  
Xiang Hui Zhang ◽  
Ling Wang ◽  
Jian Ping Long
Keyword(s):  
Surface Morphology ◽  
Direct Current ◽  
Arc Discharge ◽  
Etching Time ◽  
Diamond Coating ◽  
Diamond Coatings ◽  
Fine Grinding ◽  
Electrolytic Etching ◽  
Electrochemical Pretreatment

In the present investigation, diamond coating was deposited on fine grinding cemented carbide substrate by direct current arc discharge chemical vapor deposition. The effect of electrolytic etching time in the two-step electrochemical pretreatment process (firstly using electrolytic etching, and then using acid etching) on morphology and quality of the diamond coating were systemically studied. The surface morphology feature and quality of diamond coatings were characterized by means of Scanning Electron Microscope (SEM), laser Raman spectrometer respectively. The results showed that the electrolytic etching duration has distinctly effect on the quality and crystal features such as morphology, crystal type and grain size of diamond coating. It showed that as electrolytic current is direct current 3A, electrolytic etching time altering from 0.5 min to 7.5min, the surface morphology of diamond films gradually transition from microcrystalline cubic-octahedron to cauliflower type nanocluster, and further increase the electrolytic etching time, will lead to several negative effects on the quality and nucleation of the coatings which is not only retard the diamond nucleation, but also promote the formation of graphite.

Insight into understanding the performance of electrochemical pretreatment on improving anaerobic biodegradability of yard waste

2021 ◽  
Vol 180 ◽  
pp. 1166-1178
Author(s):  
Sagarika Panigrahi ◽  
Hari Bhakta Sharma ◽  
Bikash Ranjan Tiwari ◽  
Nakka Vamsi Krishna ◽  
M.M. Ghangrekar ◽  
...  
Keyword(s):  
Yard Waste ◽  
Anaerobic Biodegradability ◽  
Electrochemical Pretreatment ◽  
Insight Into

scholarly journals Influence of pretreatment on the properties of α-Fe2O3 and the effect on photocatalytic degradation of methylene blue under visible light

2020 ◽  
Vol 82 (11) ◽  
pp. 2415-2424
Author(s):  
S. Mokhtari ◽  
N. Dokhan ◽  
S. Omeiri ◽  
B. Berkane ◽  
M. Trari
Keyword(s):  
Methylene Blue ◽  
Average Crystallite Size ◽  
Sample Surface ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Lattice Constants ◽  
Electrochemical Pretreatment ◽  
Crystal Properties ◽  
Rhombohedral Symmetry

Abstract The hematite (α-Fe2O3) nanostructures were synthesized by thermal oxidation of metal at 500 °C under atmospheric pressure. We studied the effect of the electrochemical pretreatment of the substrate before calcinations and its impact on the morphology, crystalline structure, lattice microstructural, and optical properties of α-Fe2O3. Uniform nanosheets were observed on the sample surface after calcination; their dimension and morphology were accentuated by the pretreatment, as confirmed by the SEM images. The characteristics of the nanostructures, analyzed by X-ray diffraction (XRD), revealed a rhombohedral symmetry with the space group R-3c and lattice constants: a = 0.5034 nm and c = 1.375 nm. The average crystallite size and strain, determined from the Williamson-Hall (W-H) plot, showed substantial variations after the substrate pretreatment. The Raman spectroscopy confirmed the changes in the crystal properties of the hematite submitted to pretreatment. The diffuse reflectance allowed to evaluate the optical gap which lies between 1.2 and 1.97 eV, induced by the electrochemical processing. The photocatalytic activity of α-Fe2O3 films was assessed by the degradation of methylene blue (MB) under LED light; 15% enhancement of the degradation for the pretreated specimens was noticed.

Sewage sludge digestion beyond biogas: Electrochemical pretreatment for biochemicals

2021 ◽  
pp. 117839
Author(s):  
Qian Zeng ◽  
Feixiang Zan ◽  
Tianwei Hao ◽  
Samir Kumar Khanal ◽  
Guanghao Chen
Keyword(s):  
Sewage Sludge ◽  
Sludge Digestion ◽  
Electrochemical Pretreatment

Electrocatalytic Activity of Gold and Gold Nanoparticles Improved by Electrochemical Pretreatment

2010 ◽  
Vol 115 (1) ◽  
pp. 305-309 ◽  
Author(s):  
Jun Ho Shim ◽  
Jiyoung Kim ◽  
Chongmok Lee ◽  
Youngmi Lee
Keyword(s):  
Gold Nanoparticles ◽  
Electrocatalytic Activity ◽  
Electrochemical Pretreatment
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