Results 91 to 100 of about 169,539 (299)

A new process of extracting alumina from high-alumina coal fly ash in NH4HSO4 + H2SO4 mixed solution

, 2016
Alumina was leached from high-alumina coal fly ash with a NH4HSO4 + H2SO4 mixed solution. The leaching behavior was systematically investigated, as were factors such as mixed solution composition and concentration, reaction time and temperature, and ...
Wang, Chenye, Xu, Dehua, Bao, Weijun, Li, Huiquan   +3 more
core   +1 more source

Controlled porosity alumina structures for ultra-precision hydrostatic journal bearings [PDF]

, 2010
A series of fine-grade alumina powders has been used in combination with maize starch granules to produce porous structures for porous hydrostatic journal- bearing applications. A comprehensive series of tests was conducted to characterize porosity in
John Corbett, Corbett, John, Durazo-Cardenas, Isidro, David J. Stephenson, Isidro S. Durazo-Cardenas, Stephenson, David J., Stephenson, D. J.   +6 more
core   +1 more source

Millifluidic Synthesis of Core–Shell Resonators For Tunable Sonic BandGaps in Acoustic Metamaterials

Advanced Materials Interfaces, EarlyView.
Millimeter‐scale core–shell acoustic resonators are fabricated by a gravity‐assisted dripping approach and incorporated into epoxy composites at controlled volume fractions. The resulting alumina–core resonator composites show tunable low‐frequency acoustic attenuation, demonstrating a scalable route for integrating locally resonant metamaterial units ...
Colton Steiner, Xiaohui Shen, Bianka Pajo, Chin‐Teh Sun, Jeffrey P. Youngblood, Carlos Martinez   +5 more
wiley   +1 more source

An ab initio molecular dynamics investigation of the behaviour of amorphous substances in anodic aluminium oxide under electric field

Scientific Reports
In order to elucidate the diffusion behaviour of ions in alumina during the anodic alumina process, the effects of electric field strength, hydration content, and electrolyte on amorphous alumina and hydrated alumina were studied using ab initio ...
Zeyu An, Shiyang Sun, Binghai Dong
doaj   +1 more source

Preparation and crystallization kinetics of silica-based ceramic cores modified by alumina

Cailiao gongcheng
Alumina is a common mineralizer in silica-based ceramic cores, but its promotion or inhibition effects on the crystallization of fused-silica are in contrary conclusions.
FAN Hongna, XU Xiqing, LI Xin, QI Changjian, LI Minmin, HAN Weiwei   +5 more
doaj   +1 more source

Multinuclear MAS NMR Identification of Fluorine Species on the Surface of Fluorinated γ-Alumina

, 2016
The fluorination on the γ-alumina surface was studied by multinuclear MAS NMR and BET measurements. The fluorine species on the fluorinated γ-alumina can be identified by 19F MAS NMR combined with 1H MAS NMR and 27Al MAS and CP/MAS NMR.
Mingyong Sun (3050814), Weiping Zhang (311523), Roel Prins (2479579)   +2 more
core   +1 more source

Interface‐Driven Control of Vanadium Carbide Micro‐ and Nanocrystal Growth During Chemical Vapor Deposition

Advanced Materials Interfaces, EarlyView.
A wrapped copper–vanadium interface enables reliable chemical vapor deposition growth of vanadium carbide micro‐ and nanocrystals. Adjusting methane supply shifts the process from the formation of many small crystals toward lateral expansion and merging of larger domains, while longer growth increases surface coverage without changing the cubic ...
Pawel S. Wrobel, Sandeep Gorantla, Sebastian Arabasz, Anna Gawron, Maria Zdończyk, Krzysztof Placek, Krzysztof Lis, Szymon Abrahamczyk, Gražyna Simha Martynková, Mark H. Rümmeli, Alicja Bachmatiuk   +10 more
wiley   +1 more source

Aerosol Jet Printing of Benzocyclobutene as a Thermally Stable, Low‐Loss Dielectric for Multilayer Microwave Electronics

Advanced Materials Technologies, EarlyView.
Multilayer aerosol jet printed components with a low‐loss, thermally stable dielectric are demonstrated using benzocyclobutene. Ink formulation and in‐line droplet evaporation control support high‐quality, versatile, and stable printing performance. A specialized measurement for low‐loss materials reveals promising microwave properties, which, combined
Md Ramjan Ali, Trent Moritz, Mohammad Tayeb Al Qaseer, Ethan B. Secor   +3 more
wiley   +1 more source

Extrusion pressure generated in high alumina content paste extrusion [PDF]

, 2010
Four different alumina pastes with various solvent volume fractions were processed by extrusion free forming and the pressures generated in the extrusion process were recorded and analyzed.
Evans, J.R.G., S. Yang, J.R.G. Evans, Yang, shoufeng, Evans, J.RG., X.P. Chi, Yang, S., Chi, X.P.   +7 more
core   +1 more source

Electrochemistry‐Enabled Optical and Plasmonic Programmable Metasurfaces

Advanced Optical Materials, EarlyView.
Electrochemistry is emerging as a promising approach for engineering optical and plasmonic metasurfaces, from the fabrication of nanoscale structures to their dynamic control. This Perspective reviews electrochemical strategies for creating and tuning metasurfaces, examines current challenges and opportunities, and discusses how integration with ...
Charlène Brissaud, Leonardo Scarabelli
wiley   +1 more source