Results 61 to 70 of about 262,836 (345)

Possible Structure of Surface Active Complexes in Molten CaO-SiO2-CaF2 Slags

Наука и техника, 2005
A section area of silicon and oxygen complexes adsorbed at the boundary of “slag-gas” separation has been calculated in accordance with the concentration dependence of surface tension in molten slags.
V. F Sobolev, A. A. Chichko
doaj   +1 more source

Removing Oxide Layers and Retaining Oxide‐Free Steel Surfaces by Polishing in Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
In this study, the efficacy of wet mechanical polishing under an oxygen‐free atmosphere for deoxidation and the retention of an oxide‐free steel surface are elucidated using X‐ray photoelectron spectroscopy. The methodology proved successful; however, the results were highly dependent on the preparation of the solvents used to clean the samples after ...
Friedrich Bürger, Lienhard Wegewitz, Wolfgang Maus‐Friedrichs   +2 more
wiley   +1 more source

Substrate strain tunes operando geometric distortion and oxygen reduction activity of CuN2C2 single-atom sites

Nature Communications, 2021
The rational design of single-atom catalysts is challenging. This work reveals a substrate-strain tuned geometry distortion of CuN2C2 single-atom site, which greatly boosts oxygen reduction activity by facilitating electron transfer to adsorbed O.
Guokang Han, Xue Zhang, Wei Liu, Qinghua Zhang, Zhiqiang Wang, Jun Cheng, Tao Yao, Lin Gu, Chunyu Du, Yunzhi Gao, Geping Yin   +10 more
doaj   +1 more source

Investigation of Oxygen‐Free Wetting Behavior of Aluminum on Copper via Molecular Dynamics Simulations and Experiments

Advanced Engineering Materials, EarlyView.
The wettability of aluminum droplets (Al) on different copper substrates (Cu), where liquid Al spreads on solid Cu surfaces to form a liquid–solid interface, is studied numerically and experimentally. The experimental and numerical results show good agreement in the fast‐spreading regime.
Shan Lyu, Timon Steinhoff, Finn‐Lennard Janthur, Sarah Seffer, Jörg Hermsdorf, Christian Klose, Ludger Overmeyer, Hans‐Jürgen Maier, Nina Merkert   +8 more
wiley   +1 more source

Anomalous Behavior of Ru for Catalytic Oxidation: A Theoretical Study of the Catalytic Reaction CO + 1/2 O_2 --> CO_2

, 1997
Recent experiments revealed an anomalous dependence of carbon monoxide oxidation at Ru(0001) on oxygen pressure and a particularly high reaction rate. Below we report density functional theory calculations of the energetics and reaction pathways of the ...
A. Bielánski, C. H. F. Peden, C. H. F. Peden, C. H. F. Peden, C. Stampfl, C. Stampfl, C. Stampfl, C. Stampfl, C. T. Rettner, C. T. Rettner, C. T. Rettner, E. W. Kuipers, G. W. Coulston, H. Pfnür, J. Neugebauer, J. P. Perdew, J. Pacansky, M. Scheffler, N. Troullier, R. Stumpf, S. L. Cunningham, T. Engel   +21 more
core   +1 more source

Gas and surface diffusion in modified γ-alumina systems [PDF]

, 1989
The transport of pure gases through a microporous membrane is described. The alumina-based membrane (pores 2.5-4 nm) is suitable for Knudsen diffusion separation.
Burggraaf, A.J., Keizer, K., Uhlhorn, R.J.R.   +2 more
core   +2 more sources

Dielectric Barrier Discharge Plasma Deoxidation of Natively Oxide Layer of Copper Powders in a Fluidized Bed

Advanced Engineering Materials, EarlyView.
This paper presents a novel approach to reducing oxide layers on metal powders using low‐temperature hydrogen dielectric barrier discharge plasmas at atmospheric pressure. Unlike conventional hydrogen‐plasma reductions, the powders do not contact the plasma directly.
Shukang Zhang, Annett Wollmann, Thomas Gimpel, Alfred P. Weber   +3 more
wiley   +1 more source

The effect of deep surface acceptor states on the temperature-dependent conductivity of zinc oxide nanoparticles

Физико-химические аспекты изучения кластеров, наноструктур и наноматериалов
An experimental and theoretical study was conducted on the temperature dependence of the conductivity of zinc oxide (ZnO) layers in dry air and ethanol. The study found that the conductivity of ZnO depends non-linearly on temperature, and its type varies
N.A. Klychkov, V.V. Simakov, I.V. Sinev
doaj   +1 more source

Incorporation of Selenium into Sol–Gel‐Derived Bioactive Glass: Influence on Glass Structure, Bioactivity, and its Selective Cytotoxicity

Advanced Engineering Materials, EarlyView.
Selenium was incorporated into a sol–gel‐derived bioactive glass to enable sustained therapeutic ion release. The selenium‐containing glass preserved bioactivity while selectively inducing cytotoxicity in osteosarcoma cells and maintaining osteoblastic viability.
Breno Rocha Barrioni, Thalita Marcolan Valverde, Talita Martins, Guilherme Mattos Jardim Costa, Alfredo Miranda de Goes, Marcello Rosa Dumont, Eduardo Henrique Martins Nunes, Marivalda de Magalhães Pereira   +7 more
wiley   +1 more source

NANOSTRUCTURAL PROCESSES OF MELTING AND MOULDING OF STEEL

Литьë и металлургия, 2016
It is shown that melting and molding of steel are difficult physical and chemical nanostructural processes. In them the major role is played by the centers of crystallization of dendrites of austenite, austenite nanocrystals, the dissolved and adsorbed ...
V. Yu. Stetsenko
doaj