Chemical elaboration of well defined Cu(In,Ga)Se2 surfaces after aqueous oxidation etching

2003 ◽  
Vol 64 (9-10) ◽  
pp. 1791-1796 ◽  
Author(s):  
B. Canava ◽  
J.F. Guillemoles ◽  
J. Vigneron ◽  
D. Lincot ◽  
A. Etcheberry
Keyword(s):  
Aqueous Oxidation

Supported Silver-Nanoparticle-Catalyzed Highly Efficient Aqueous Oxidation of Phenylsilanes to Silanols

2008 ◽  
Vol 120 (41) ◽  
pp. 8056-8058 ◽  
Author(s):  
Takato Mitsudome ◽  
Shusuke Arita ◽  
Haruhiko Mori ◽  
Tomoo Mizugaki ◽  
Koichiro Jitsukawa ◽  
...  
Keyword(s):  
Silver Nanoparticle ◽  
Highly Efficient ◽  
Aqueous Oxidation

Controlled Synthesis, Mechanism and Degradation Property of Birnessite-MnO2 Nanoflowers and Nanoflakes

2021 ◽  
Vol 21 (9) ◽  
pp. 4846-4851
Author(s):  
Xin-Li Hao ◽  
Yue-Hong Song ◽  
Lin-Yi Li ◽  
Lu-Feng Li ◽  
Shuo-Shuo Chang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Optical Property ◽  
Controlled Synthesis ◽  
Synthesis Mechanism ◽  
Oxidation Method ◽  
X Ray ◽  
Aqueous Oxidation ◽  
Degradation Properties ◽  
Scanning Electron

Birnessite-MnO2 nanoflakes were synthesized via an aqueous oxidation method at 90 °C using Mn(CH3COO)2, NaOH, and KMnO4. The samples’ morphology, crystalline structure, and optical property were determined by field emission scanning electron microscopy, X-ray powder diffraction and UV-Vis spectrophotometry. The birnessite-MnO2 nanoflakes were converted to KxMn8O16 and Mn suboxides following a decrease in the concentration of KMnO4 in the reaction. The amount of NaOH in the reaction determined the type of precursor. Without NaOH, the precursor was converted from Mn(OH)2 to Mn2+ (from Mn(CH3COO)2), thereby enabling the synthesis of birnessite-MnO2 nanoflowers. The formation mechanism of birnessite-MnO2 nanoflowers and nanoflakes was clarified via the corresponding simulated crystal structures. Evaluation of the synthesized samples confirmed that the birnessite-MnO2 nanoflakes and nanoflowers exhibited excellent degradation properties.

Aqueous oxidation of alcohols catalyzed by artificial metalloenzymes based on the biotin–avidin technology

2005 ◽  
Vol 690 (20) ◽  
pp. 4488-4491 ◽  
Author(s):  
Christophe M. Thomas ◽  
Christophe Letondor ◽  
Nicolas Humbert ◽  
Thomas R. Ward
Keyword(s):  
Oxidation Of Alcohols ◽  
Aqueous Oxidation ◽  
Artificial Metalloenzymes

scholarly journals Semi-closed Synthesis of Nitrogen and Oxygen Co-doped Mesoporous Carbon for Selective Aqueous Oxidation

2020 ◽  
Author(s):  
Chen Xing ◽  
Daihui Yang ◽  
Yan Zhang ◽  
Tian Sun ◽  
Junfei Duan ◽  
...  
Keyword(s):  
Mesoporous Carbon ◽  
Aqueous Oxidation ◽  
Co Doped

Pressure aqueous oxidation of molybdenite concentrate with oxygen

2017 ◽  
Vol 174 ◽  
pp. 131-139 ◽  
Author(s):  
Yun-feng Fu ◽  
Qing-gui Xiao ◽  
Yi-ying Gao ◽  
Peng-ge Ning ◽  
Hong-bin Xu ◽  
...  
Keyword(s):  
Molybdenite Concentrate ◽  
Aqueous Oxidation

Nanocarbon-Based Catalytic Ozonation for Aqueous Oxidation: Engineering Defects for Active Sites and Tunable Reaction Pathways

ACS Catalysis ◽  
2020 ◽  
Vol 10 (22) ◽  
pp. 13383-13414
Author(s):  
Yuxian Wang ◽  
Xiaoguang Duan ◽  
Yongbing Xie ◽  
Hongqi Sun ◽  
Shaobin Wang
Keyword(s):  
Active Sites ◽  
Catalytic Ozonation ◽  
Reaction Pathways ◽  
Aqueous Oxidation

scholarly journals Formation of a Pd/MgO Structured Catalyst for the Aqueous Oxidation of Silane to Silanol

Catalysts ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 834 ◽  
Author(s):  
Zhou ◽  
Cao ◽  
Wang ◽  
Li
Keyword(s):  
Catalytic Activity ◽  
Pd Nanoparticles ◽  
Structured Catalysts ◽  
Long Term Stability ◽  
Plasma Electrolyte ◽  
Structured Catalyst ◽  
Aqueous Oxidation ◽  
Plasma Electrolyte Oxidation ◽  
Fabrication Parameters

The catalytic oxidation of silanes to produce silanols using water as an oxidant at mild temperatures is a major challenge in Si-H activation. Highly efficient and easy-to-recycle catalysts based on Pd nanoparticles are in high demand. In this study, Pd nanoparticles embedded in an MgO porous overlayer on an Mg plate as a structured catalyst was prepared by the plasma electrolyte oxidation (PEO) technique. The Pd/MgO catalyst is strongly anchored to the MgO plate, building a structured catalyst. Fabrication parameters such as the temperature of the electrolyte and applied voltage significantly influenced the structure of the obtained Pd/MgO catalyst and in turn its catalytic activity. The catalytic activities of Pd/MgO were evaluated by activation of a Si-H bond for catalyzing the aqueous oxidation of silanes to silanol at mild temperatures. The catalytic activity of Pd nanoparticles is favored by their electro-deficient state due to influence from the MgO substrate. The Pd/MgO catalyst exhibits good performance stability during recycling. This work paves the way for fabricating structured catalysts with long-term stability and enhanced metal–oxide interaction.

Oxygen isotope fractionation between rutile and water and geothermometry of metamorphic eclogites

1979 ◽  
Vol 43 (327) ◽  
pp. 405-413 ◽  
Author(s):  
Alan Matthews ◽  
Robert D. Beckinsale ◽  
John J. Durham
Keyword(s):  
Oxygen Isotope ◽  
Isotope Fractionation ◽  
Western Alps ◽  
Titanium Metal ◽  
Isotopic Equilibrium ◽  
Oxygen Isotope Fractionation ◽  
Tauern Window ◽  
Theoretical Predictions ◽  
Aqueous Oxidation ◽  
Isotope Analyses

SummaryOxygen isotope fractionation between rutile and water has been studied from 300 °C to 700 °C, PH2O = 1 kb, using aqueous oxidation of titanium metal as the equilibration reaction. The mechanism of rutile formation (which is critical to the assessment of isotopic equilibrium) is an ‘armouring’ reaction in which rutile grows around grains of titanium metal by solution-precipitation processes. Mean fractionation factors expressed as 103 In αTiO2-H2O obtained in the present study are:−6.20±0.23‰ at 304±5 °C−6.64±0.27‰ at 405±6 °C−6.11±0.16%. at 508±6 °C−4.45±0.28%. at 608±6 °C−3.38±0.15%. at 698±6 °C.These data agree with those obtained at temperatures above 500 °C by Addy and Garlick (1974) but do not accord with theoretical predictions by Bottinga and Javoy (1973). A minimum in the calibration curve 103 ln α versus 106T−2 occurs between 300 °C and 500 °C but from 500 °C to 700 °C 18O fractionation between rutile and water may be expressed by the equation:103 ln α = −(4.72±0.40)106T−2+(1.62±0.53).Oxygen isotope analyses of rutile and quartz from metamorphic eclogites and schists from the Tauern Window, Austria, yield isotopic temperatures at about 550 °C in agreement with results obtained on similar rocks from the Sesia Zone (Western Alps, Italy) and elsewhere by other workers. Petrologic studies indicate that the latest metamorphism of the Tauern eclogites reached about 450 °C Thus the measured partitions of 18O between rutile and quartz indicating temperatures around 550 °C have been inherited from an earlier metamorphic event.

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