Abnormal thermal stability of sub-10 nm Au nanoparticles and their high catalytic activity

2019 ◽  
Vol 7 (18) ◽  
pp. 10980-10987 ◽  
Author(s):  
Xiaoqing Cao ◽  
Jun Zhou ◽  
Hongna Wang ◽  
Song Li ◽  
Wei Wang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
Plasma Electrolytic Oxidation ◽  
Au Nanoparticles ◽  
High Catalytic Activity ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Thermal Stability Of

Abnormal thermal stability and high catalytic activity of sub-10 nm Au nanoparticles prepared by novel interfacial plasma electrolytic oxidation.

Study of Thermal Stability of Superhydrophobic Properties of Coatings Formed on Magnesium Alloy

2021 ◽  
Vol 324 ◽  
pp. 3-8
Author(s):  
Konstantine V. Nadaraia ◽  
Dmitry V. Mashtalyar ◽  
Sergey N. Suchkov ◽  
Vera V. Mostovaya ◽  
Igor M. Imshinetskiy ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Contact Angle ◽  
Magnesium Alloy ◽  
Contact Angle Hysteresis ◽  
Surface Layers ◽  
Properties Of Coatings ◽  
Composite Layers ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Thermal Stability Of

The thermal stability of the superhydrophobic properties of coatings obtained on a magnesium alloy by plasma electrolytic oxidation (PEO) followed by treatment with fluoropolymer was studied. It was established that formed surface layers have contact angle (CA) equal to 171° and contact angle hysteresis equal to 6° at 25 °C, which allows to characterize them as superhydrophobic. After 5 cycles of cooling-heating of composite layers, CA was 135°, indicating the durability of coatings. Additionally, obtained polymer-containing layers demonstrated low wettability at 0 °C (CA was 105°).

scholarly journals The Sintering of Au Nanoparticles on Flat {100}, {111} and Zigzagged {111}-Nanofacetted Structures of Ceria and Its Influence on Catalytic Activity in CO Oxidation and CO PROX

2020 ◽  
Author(s):  
O. S. Bezkrovnyi ◽  
P. Kraszkiewicz ◽  
W. Mista ◽  
L. Kepinski
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Catalytic Activity ◽  
Beneficial Effect ◽  
Co Oxidation ◽  
Au Nanoparticles ◽  
Ceria Support ◽  
Ceria Catalysts ◽  
Thermal Stability Of

Abstract The thermal stability of Au nanoparticles on ceria support of various morphology (nanocubes, nanooctahedra, and {111}-nanofacetted nanocubes) in oxidizing and reducing atmospheres was investigated by electron microscopy. A beneficial effect of the reconstruction of edges of ceria nanocubes into zigzagged {111}-nanofacetted structures on the inhibition of sintering of Au nanoparticles was shown. The influence of different morphology of Au particles on various ceria supports on the reducibility and catalytic activity in CO oxidation, and CO PROX of Au/ceria catalysts was also investigated and discussed. It was shown, that ceria nanocubes with flat {110} terminated edges are more suitable as a support for Au nanoparticles, used to catalyze CO oxidation, than zigzagged {111}- nanofacetted structures. Graphic Abstract

Effect of acetylacetone metal salts on curing mechanism and thermal stability of polybenzoxazine

2020 ◽  
Vol 32 (8) ◽  
pp. 953-962
Author(s):  
Hongqiang Yan ◽  
Jianan Hu ◽  
Huaqing Wang ◽  
Zuomin Zhan ◽  
Jie Cheng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
Photoelectron Spectroscopy ◽  
High Water ◽  
Carbon Layer ◽  
Metal Salts ◽  
High Catalytic Activity ◽  
Scanning Calorimetry ◽  
Activity Structure ◽  
Thermal Stability Of

To overcome high water absorption of inorganic metal salts and their poor compatibility with resin, acetylacetone metal salts (M(acac) n) were selected as the catalysts of benzoxazine resin. Their effects on the catalytic activity, structure, and thermal stability of polybenzoxazine had been estimated by dynamic differential scanning calorimetry, in situ Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermal gravimetric analyzer. The results revealed that M(acac) n of iron (Fe3+), cobalt (Co3+ and Co2+), and copper (Cu2+) exhibited high catalytic activity and reduced evidently activation energy, especially acetylacetone iron salt. The addition of M(acac) n was beneficial to the formation of Ph–N–Ph structure, which was easy to form a denser carbon layer during thermal degradation, prevented heat transfer and further decomposition of the resin, and finally led to the increase of carbon residue at high temperature.

Composition, Structure, and Catalytic Activity of SiO2+TiO2/Ti and MnOx+SiO2+TiO2/Ti Composites Formed by Combination of the Methods of Plasma Electrolytic Oxidation, Impregnation and Annealing

2015 ◽  
Vol 245 ◽  
pp. 238-242 ◽  
Author(s):  
Marina S. Vasilyeva ◽  
V.S. Rudnev ◽  
Alexander Yu. Ustinov
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Plasma Electrolytic Oxidation ◽  
Manganese Oxides ◽  
Outer Part ◽  
Oxide Layers ◽  
Co Conversion ◽  
Electrolytic Oxidation ◽  
Composition Structure ◽  
Plasma Electrolytic

New data on the structure of silicon-containing oxide layers SiO2+TiO2 on titanium formed by the method of plasma electrolytic oxidation (PEO) as well as on the structure and catalytic activity in CO oxidation of MnOx+SiO2+TiO2/Ti composites formed on their basis using impregnation and annealing methods have been obtained. It has been demonstrated that silicon and titanium are rather homogeneously distributed over the SiO2+TiO2 coating bulk. The coating outer part is silicon-enriched titanium-depleted. The MnOx+SiO2+TiO2/Ti composites catalyze the CO conversion at temperatures above 100°C. Nanowhiskers consisting predominantly of manganese oxides have been found on the surface of the MnOx+SiO2+TiO2/Ti composites.

ffect of Na2WO4 in electrolyte on mechanical properties of oxide layer on Al alloy via plasma electrolytic oxidation

2015 ◽  
Vol 53 (8) ◽  
pp. 535-540 ◽  
Author(s):  
Young Gun Ko ◽  
Dong Hyuk Shin ◽  
Hae Woong Yang ◽  
Yeon Sung Kim ◽  
Joo Hyun Park ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Oxide Layer ◽  
Plasma Electrolytic Oxidation ◽  
Al Alloy ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

MODELING OF THE ELECTROLYZER ELECTRIC FIELD FOR PEO OF MAGNESIUM FOR THE STUDY OF SPECIAL CHAPTERS OF ELECTRICAL ENGINEERING

2019 ◽  
Author(s):  
Veta Mukaeva ◽  
E. Parfenov ◽  
R. Mukaev ◽  
M. Gorbatkov
Keyword(s):  
Magnesium Alloy ◽  
Electric Field ◽  
Plasma Electrolytic Oxidation ◽  
Electrical Engineering ◽  
Professional Competencies ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

The issue of modeling the distribution of the electric field in the electrolyzer during the plasma-electrolytic oxidation of a magnesium alloy for the motivation and formation of professional competencies for students in the study of electrical engineering disciplines is considered.

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