X-ray photoelectron spectroscopic studies on nanoquasicrystalline powders of Al70Cu20Fe10 obtained by mechanical alloying

2002 ◽  
Vol 17 (8) ◽  
pp. 1892-1895 ◽  
Author(s):  
P. Barua ◽  
V. Srinivas ◽  
S. Dhabal ◽  
T. B. Ghosh
Keyword(s):  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Prolonged Exposure ◽  
Chemical Properties ◽  
Spectroscopic Studies ◽  
Quasicrystalline Phase ◽  
Surface Chemical ◽  
Ambient Conditions ◽  
X Ray ◽  
Ball Milling Technique

Surface chemical properties of nanoguasicrystalline powders of Al–Cu–Fe synthesized by the ball-milling technique have been investigated using x-ray photoelectron spectroscopy (XPS). The samples were exposed to ambient conditions at room temperature as well as higher temperatures. Our XPS results reveal that the surfaces of nanopowders of Al70Cu20Fe10 are coated with an Al2O3 layer within which the quasicrystalline phase resides. It also appears that the thickness of this layer does not increase significantly on either heating below 873 K or prolonged exposure to ambient conditions.

X-Ray Photoelectron-Spectroscopic Studies of Carbon Fiber Surfaces. Part IX: The Effect of Microwave Plasma Treatment on Carbon Fiber Surfaces

1989 ◽  
Vol 43 (7) ◽  
pp. 1153-1158 ◽  
Author(s):  
Yaoming Xie ◽  
Peter M. A. Sherwood
Keyword(s):  
Carbon Fiber ◽  
Plasma Treatment ◽  
Photoelectron Spectroscopy ◽  
Prolonged Exposure ◽  
Microwave Plasma ◽  
Spectroscopic Studies ◽  
X Ray ◽  
Fiber Damage ◽  
Surface Functionality ◽  
Fiber Treatment

X-ray photoelectron spectroscopy has been used to monitor the surface chemical changes occurring on type II carbon fibers exposed to air, oxygen, and nitrogen plasmas. In all cases the plasmas caused changes in surface functionality, in terms of both C-O and C-N functionality. Prolonged exposure to the plasmas caused loss of surface functionality for air and oxygen plasmas, and extended treatment caused fiber damage. Plasma treatment of fibers promises to be an effective method of fiber treatment.

scholarly journals Droplet Flow Assisted Electrocatalytic Oxidation of Selected Alcohols under Ambient Condition

Molecules ◽  
2022 ◽  
Vol 27 (2) ◽  
pp. 382
Author(s):  
Mohammed A. Suliman ◽  
Khaled M. Al Aqad ◽  
Chanbasha Basheer
Keyword(s):  
Photoelectron Spectroscopy ◽  
Electrocatalytic Oxidation ◽  
Room Temperature ◽  
Ambient Conditions ◽  
Droplet Flow ◽  
X Ray ◽  
Cobalt Phosphide ◽  
Substrate Conversion ◽  
The Individual ◽  
Electrolysis Potential

This study reports using a droplet flow assisted mechanism to enhance the electrocatalytic oxidation of benzyl alcohol, 2-phenoxyethanol, and hydroxymethylfurfural at room temperature. Cobalt phosphide (CoP) was employed as an active electrocatalyst to promote the oxidation of each of the individual substrates. Surface analysis of the CoP electrocatalyst using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), as well as electrochemical characterization, revealed that it had excellent catalytic activity for each of the substrates studied. The combined droplet flow with the continuous flow electrochemical oxidation approach significantly enhanced the conversion and selectivity of the transformation reactions. The results of this investigation show that at an electrolysis potential of 1.3 V and ambient conditions, both the selectivity and yield of aldehyde from substrate conversion can reach 97.0%.

scholarly journals Physico-Chemical Properties of NaV3O8 Prepared by Solid-State Reaction

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6976
Author(s):  
Mariya Shchelkanova ◽  
Georgiy Shekhtman ◽  
Svetlana Pershina ◽  
Emma Vovkotrub
Keyword(s):  
Solid State ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Chemical Properties ◽  
Solid State Method ◽  
X Ray ◽  
Synthesis Conditions ◽  
Optimum Synthesis ◽  
Physico Chemical ◽  
Galvanostatic Conditions

Sodium–vanadium oxide NaV3O8 is synthesized via solid-state method and optimum synthesis conditions are chosen based on the data of DSC and TG analysis. The material synthesized is characterized by X-ray phase analysis, Raman spectroscopy and scanning electron microscopy. The ratio V4+/V5+ in the sample obtained is determined by X-ray photoelectron spectroscopy. Conductivity of the material synthesized was measured by impedance spectroscopy, pulse potentiometry and DC method over the range RT–570 °C. It is shown that NaV3O8 has rather high conductivity essentially electron in type (6.3 × 10−2 at room temperature). AC and DC conductivity measurements are performed and cycling of symmetricNaV3O8|Na3.85Zr1.85Nb0.15Si3O12|NaV3O8 cell in galvanostatic conditions. Thermal stability is studied across 25–570 °C temperature range. The results obtained are compared with the properties of NaV3O8 produced via aqueous solution.

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