Fabrication and Photoresponse of Self-Organized TiO2 Mesoporous by Alternative Voltage Condition

2012 ◽  
Vol 626 ◽  
pp. 580-583
Author(s):  
Pacharee Krongkitsiri ◽  
Udom Tipparach
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Oxalic Acid ◽  
Open Circuit Potential ◽  
Pure Titanium ◽  
Open Circuit ◽  
Self Organized ◽  
Anodization Method ◽  
Scanning Electron

Mesoporous of TiO2electrodes (MOTE) were fabricated on pure titanium sheets in aqueous based electrolytes that consist of NaSO4NH4F and Oxalic acid by an anodization method with alternative voltage condition. Morphology of MOTE was characterized by scanning electron microscopy. The characteristic photoresponse in 0.1 M Na2SO4on the MOTE was investigated. The MOTE shows an excellent photoresponse property that is significant at low open-circuit potential.

Effect of Bi Addition on the Electrochemical Behavior of Zinc Electrodes in Concentrated Alkaline Solutions

2013 ◽  
Vol 805-806 ◽  
pp. 1240-1249
Author(s):  
Hong Xia Liang ◽  
Fu Rong Li ◽  
Zhi Lin Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Linear Polarization ◽  
Electrochemical Behavior ◽  
Open Circuit Potential ◽  
Open Circuit ◽  
Exchange Current ◽  
Zinc Electrode ◽  
Current Densities ◽  
Scanning Electron

The electrochemical behavior of zinc electrode with bismuth addition in 35%KOH solutions has been investigated systematically by electrochemical methods including linear polarization, potentiostatic polarization, potential-time measurements at a constant current density, combining the observations of scanning electron microscopy (SEM). Linear polarization results showed that the open circuit potential shifted positively with increasing bismuth content, which is explained based on the gassing data and change in the exchange current of the zinc electrode. Addition of bismuth increased the exchange current of zinc reaction and caused an increase in the measured open circuit potential. Galvanostatic results showed that the addition of bismuth shortened the passivation time. Scanning electron microscopy images showed that the addition of bismuth aggravated the corrosion of zinc electrode which may be responsible for the increased tendency to passivation at high current densities. It has been found that at low current densities the reaction kinetics may be increased by addition of Bi, which is general agreement with the discharging test of actual alkaline batteries.

scholarly journals Understanding the Nature of the Manganese Hot Dip Phosphatizing Process of Steel

2017 ◽  
Vol 57 (4) ◽  
Author(s):  
Gabriela Alvarado-Macías ◽  
Juan Carlos Fuentes-Aceituno ◽  
Armando Salinas-Rodríguez ◽  
Francisco Javier Rodríguez-Varela
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Phosphoric Acid ◽  
Species Distribution ◽  
Open Circuit Potential ◽  
Open Circuit ◽  
The Other ◽  
Energy Dispersive ◽  
X Ray ◽  
Scanning Electron

In this work, the phosphatizing process of steel is investigated using open circuit potential and Tafel curves as well as scanning electron microscopy and energy dispersive X-ray spectroscopy. The results reveal that a pH of 2.57 in the phosphatizing solution promotes the dissociation of phosphoric acid which assists the formation of the manganese tertiary salt (Mn<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>), which is deposited on the substrate. It was also observed that an increase in the temperature from 25 to 90°C and the presence of HNO<sub>3</sub> as catalyst enhances the manganese phosphatizing kinetics. On the other hand, the generation of iron phosphates and oxides is predominant at a pH of 1 and 90°C. These observations are supported by species distribution and Pourbaix thermodynamic diagrams.

scholarly journals Microstructural Analysis of Fractured Orthopedic Implants

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2209
Author(s):  
Mateusz Kopec ◽  
Adam Brodecki ◽  
Grzegorz Szczęsny ◽  
Zbigniew L. Kowalewski
Keyword(s):  
Physical Activity ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fracture Behavior ◽  
Locking Plate ◽  
Microstructural Analysis ◽  
Pure Titanium ◽  
Orthopedic Implants ◽  
Mechanical Loads ◽  
Scanning Electron

In this paper, fracture behavior of four types of implants with different geometries (pure titanium locking plate, pure titanium femoral implant, Ti-6Al-4V titanium alloy pelvic implant, X2CrNiMo18 14-3 steel femoral implant) was studied in detail. Each implant fractured in the human body. The scanning electron microscopy (SEM) was used to determine the potential cause of implants fracture. It was found that the implants fracture mainly occurred in consequence of mechanical overloads resulting from repetitive, prohibited excessive limb loads or singular, un-intendent, secondary injures. Among many possible loading types, the implants were subjected to an excessive fatigue loads with additional interactions caused by screws that were mounted in their threaded holes. The results of this work enable to conclude that the design of orthopedic implants is not fully sufficient to transduce mechanical loads acting over them due to an increasing weight of treated patients and much higher their physical activity.

SYNTHESIS, CHARACTERIZATION, AND ASSEMBLY OF CdSe QUANTUM DOT ARRAY

2008 ◽  
Vol 07 (01) ◽  
pp. 9-19 ◽  
Author(s):  
B. VIGNEASHWARI ◽  
S. DASH ◽  
A. K. TYAGI ◽  
S. AUSTIN SUTHANTHIRARAJ
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Quantum Dot ◽  
Nanocrystalline Powders ◽  
Phonon Confinement ◽  
Force Microscopy ◽  
Line Shapes ◽  
Self Organized ◽  
Chemical Procedure ◽  
Scanning Electron

CdSe semiconducting nanoparticles in the range of 6–7 nm in size were synthesized by a soft chemical procedure at room temperature. The particles were characterized by powder X-ray diffraction, UV–visible optical spectroscopy revealing nanocrystallization, and quantum mechanical electron confinement. Photoluminescence and Raman spectroscopy of these nanocrystalline powders indicated optical phonon confinement. Asymmetric line shapes revealed occurrence of nonzone center phonons. The particles could be successfully deposited on ITO substrate by electrophoresis to obtain self-organized quantum dot array. Scanning electron microscopy, high-resolution scanning electron microscopy, confocal fluorescence microscopy, and atomic force microscopy investigations revealed self-similar deposits.

Weathering of a Basalt by Pertusaria Corallina

1980 ◽  
Vol 12 (3) ◽  
pp. 277-290 ◽  
Author(s):  
D. Jones ◽  
M. J. Wilson ◽  
J. M. Tait
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Oxalic Acid ◽  
Clay Minerals ◽  
Plagioclase Felspar ◽  
Alumino Silicate ◽  
Mineral Alteration ◽  
Silicate Materials ◽  
Scanning Electron

AbstractThe weathering phenomena resulting from the encrustation of basalt by Pertusaria corallina have been studied by scanning electron microscopy and a variety of other techniques. The rock consists largely of plagioclase felspar (labradorite) and ferromagnesian minerals, the latter often being replaced by hydrothermally formed ferruginous clay minerals. Lichen weathering results in the extensive etching of the primary rock-forming minerals, particularly labradorite, and in the degradation of the clay minerals to yield a thin ochreous crust of poorly-ordered ferruginous (ferrihydrite) and alumino-silicate materials. These changes are brought about principally by the oxalic acid secreted by the mycobiont, a conclusion supported by observations following experimental mineral alteration.

Synthesis of V6O13 Flowers-Like with Control pH for Li-Ion Battery Cathodes

2016 ◽  
Vol 697 ◽  
pp. 710-713
Author(s):  
Zheng Guang Zou ◽  
Hong Xu Chen ◽  
Qi Yuan ◽  
Zhong Liang Hou
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Oxalic Acid ◽  
Electrochemical Performance ◽  
Li Ion Battery ◽  
X Ray Diffraction ◽  
Discharge Performance ◽  
X Ray ◽  
Li Ion ◽  
Scanning Electron

To improve electrochemical performance of Li ion battery , we synthesis flower-like V6O13 in oxalic acid solvent with HCl. The composition and morphology of the V6O13 were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements, respectively. The synthesized flowers-like V6O13 are less than 600nm in the width of the ribbon and have purity phase of the V6O13.The electrochemical performance of the flowers-like V6O13 were characterized by charge and discharge performance, EIS and CV. The flowers-like V6O13 exhibited high electrochemical performance.

Influence of Chelating Agents and Mechanical Pretreatment on Enzymatic Retting of Flax

1997 ◽  
Vol 67 (11) ◽  
pp. 829-836 ◽  
Author(s):  
Gunnar Henriksson ◽  
Danny E. Akin ◽  
Luanne L. Rigsby ◽  
Nirav Patel ◽  
Karl-Erik L. Eriksson
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Acetic Acid ◽  
Oxalic Acid ◽  
Chelating Agents ◽  
Reducing Sugars ◽  
Structural Features ◽  
Citrus Peel ◽  
Mechanical Pretreatment ◽  
Scanning Electron

Adding chelating agents, i.e., oxalic acid and ethylenediamine-tetra-acetic acid (edta), substantially increases the retting effect on flax by the commercial enzyme products Ultrazym and Flaxzyme (Novo Nordisk), as shown by scanning electron microscopy, release of reducing sugars, and the Fried test. Degradation of pectin-rich citrus peel by these enzymes also increases with the addition of oxalic acid and edta, while citric acid has a low or insignificant effect. Oxalic acid at 50 mmol concentration reduces the amount of Flaxzyme required to effectively ret flax stems, according to the Fried test, by a factor of about 50. Retting with Flaxzyme and 50 mmol oxalic acid is completed in approximately half the time at 45°C, compared with that at 22°C. A mechanical pretreatment that crushes flax stems by pulling them over a surface at a 90° angle opens the flax structure and further increases the efficiency of enzymatic retting. These procedures appear to modify both the chemical and structural features of flax, and they reduce the time as well as the amount of enzyme required to ret flax, therefore improving technical efficiency and economic attractiveness at the commercial level.

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