New Type of Advanced Catalytic Material Based Upon Alumina Epitaxially Grown onto Thin Alumina Foil

1997 ◽  
Vol 497 ◽  
Author(s):  
S. F. Tikhov ◽  
G. V. Chernykh ◽  
V. A. Sadykov ◽  
A. N. Salanov ◽  
S. V. Tsybulya ◽  
...  
Keyword(s):  
Transition Metal Oxides ◽  
Porous Alumina ◽  
Selective Reduction ◽  
Aluminum Foil ◽  
Absorption Capacity ◽  
Platinum Group Metals ◽  
Catalytic Material ◽  
New Type ◽  
Hydrocarbon Oxidations ◽  
Thermal Stability Of

ABSTRACTFormation of planar layered Al2O3/Al composites via aluminum foil anodic-spark oxidation was studied by using SEM and XRD. A lateral growth of the primary non-porous alumina islands was shown to proceed to an extent where the entire surface was covered, and this layer is responsible for determining the high thermal stability of composite. A washcoating by an alumina suspension substantially increases pore volume and water absorption capacity. Catalysts based on the platinum group metals and transition metal oxides exhibit high activity for the reactions of CO and hydrocarbon oxidations and the selective reduction of nitrogen oxides by hydrocarbons.

Thin-Film High-Barrier Technology for New Type Packaging Material

2010 ◽  
Vol 113-116 ◽  
pp. 2333-2336 ◽  
Author(s):  
Chun Wei Li ◽  
Xue Song Jiang ◽  
Qun Li Zhang ◽  
Shu Yan Xu ◽  
Gui Ying Wang
Keyword(s):  
Thin Film ◽  
Food Packaging ◽  
Substrate Surface ◽  
Aluminum Foil ◽  
Packaging Material ◽  
Research Progress ◽  
Current Status ◽  
High Polymer ◽  
New Type ◽  
Reactive Gases

Food Packaging material requires an excellent barrier ability to humidity and oxygen.SiOx barrier thin film deposited on high polymer substrate can compare beauty with aluminum foil in the barrier quality,even more SiOx barrier thin film is obviously allowing microwave permeating directly and it also provide a chance for merchant to vision their production in shelf life.SiOx film as barrier packaging material is becoming a high light.The current status and research progress of new type high barrier thin film packaging material were overviewed and production technology was introduced. The various influencing factors were discussed, including background vacuum, reactive gases, and pretreatment of the substrate surface and properties.

scholarly journals Case Study about the Energy Absorption Capacity of Metal Oxide Varistors with Thermal Coupling

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 536 ◽  
Author(s):  
Flaviu Frigura-Iliasa ◽  
Sorin Musuroi ◽  
Ciprian Sorandaru ◽  
Doru Vatau
Keyword(s):  
Thermal Stability ◽  
Metal Oxide ◽  
Thermal Activation ◽  
Absorption Capacity ◽  
Technical Solution ◽  
Thermal Coupling ◽  
Thermal Exchange ◽  
Surge Arresters ◽  
Thermal Stability Of

Metal oxide varistors are applied today inside modern surge arresters for overvoltage protection for all voltage levels. Their main issue is the thermal activation of their crossing current, which could lead to complete destruction by thermal runaway. This article presents a new technological solution developed in order to increase the thermal stability of metal oxide varistors. It consists in connecting in parallel two or more similar varistors (for dividing their current), having a thermal coupling between them (for equalizing their temperatures and forcing them to act together and simultaneously as much as possible). Starting from a finite element computer model performed for each situation (varistor standalone or parallel), up to real measurements, the thermal stability of the equipment was analyzed in permanent and impulse regime. Experiments were carried out in the same conditions. Experimental data obtain from two disk varistors corresponds very well to simulations, proving that parallel connection of varistors, combined with a thermal exchange between them is an efficient technical solution for thermal stability improvement, even if not apparently economically justified.

Preparation and thermal stability of porous alumina membranes with nano-pore arrays

2009 ◽  
Vol 98 (4) ◽  
pp. 745-749 ◽  
Author(s):  
Xue Hua Wang ◽  
Cheng Yong Li ◽  
Gui Chen ◽  
Lei He ◽  
Hong Cao
Keyword(s):  
Thermal Stability ◽  
Porous Alumina ◽  
Alumina Membranes ◽  
Thermal Stability Of

Formation of Porous Anodic Alumina from Impure Aluminum Foil in Inorganic Acids

2015 ◽  
Vol 1112 ◽  
pp. 89-93
Author(s):  
Ahmad Nurrudin ◽  
Brian Yuliarto ◽  
Suyatman ◽  
Agung Sriwongo
Keyword(s):  
Room Temperature ◽  
Porous Alumina ◽  
Aluminum Foil ◽  
Average Diameter ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Sulfate Electrolyte ◽  
Average Pore ◽  
Interpore Distance ◽  
Inorganic Acids

The morphology of porous anodic alumina (PAA) formed by anodizing in inorganic electrolytes is reported. An impure aluminum was anodized in sulfuric acid, phosphoric acid and chromic acidat room temperature with a constant applied potential 2 – 30 V. The formation of porous anodic alumina was carried out by one and two steps anodization. It is clearly noted that anodizing impure aluminum at room temperature provide higher kinetic of oxide dissolution compared to oxide growth. Two steps anodizing aluminum in sulfate electrolyte always resulted in random porous alumina, while phosphate electrolyte provided strong anodization producing irregular porous alumina with average diameter of 61.6 nm. Two steps anodizing aluminum in chromate electrolyte produce better pore ordering with relatively large size pore distributions. The average pore diameter of alumina increases linearly with applied voltage, with proportionality factor lp 0.83 nmV-1. Annealing the sample increased the interpore distance, removed stresses providing lower activation energy for pore formation.

Transition metal oxides as catalysts for the selective reduction of nitrobenzene

1994 ◽  
Vol 93 (3) ◽  
pp. 305-316 ◽  
Author(s):  
A. Maltha ◽  
S.C. van Wermeskerken ◽  
B. Brunet ◽  
V. Ponec
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Selective Reduction

Energy Absorption Capacity of Thermally Sprayed Aluminium Friction Damper

1996 ◽  
Author(s):  
S. Ono ◽  
Japan K. Nakahira ◽  
S. Tsujioka ◽  
K. Inoue
Keyword(s):  
High Strength ◽  
Absorption Capacity ◽  
Repeated Loading ◽  
Friction Damper ◽  
Faying Surface ◽  
New Type ◽  
Friction Joint ◽  
Force Contact ◽  
Thermally Sprayed ◽  
Hysteresis Characteristics

Abstract When buildings are subjected to earthquakes, dampers are effective in decreasing their failure by absorbing the input energy. An object of this study is to develop a new type of friction damper, on whose faying surface aluminium is sprayed, and the double friction joint is tightened with a high-strength bolt. When slip occurs on this friction damper, the slip coefficient is high and comparatively stable. Specimens of the friction damper were tested under the dynamic repeated loading condition to investigate the effect of the condition of the faying surface on the dynamic hysteresis characteristics. The parameters of the test are the type of sprayed metal, the sprayed side of the plate(s), thickness of sprayed metal, the finish of the sprayed surface, and initial clamping force (contact pressure). Results indicate that there exists the condition of suitable characteristics of a metal sprayed friction damper.

Synthesis and Performance of a Novel Coumarin-Containing Side-Chain Liquid Crystalline Polymer

2011 ◽  
Vol 181-182 ◽  
pp. 197-200
Author(s):  
Yu Lei Zhao ◽  
Wei Min Zhang ◽  
Ji Lei Li ◽  
Fan Fan Yu ◽  
Jia Ling Pu
Keyword(s):  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Liquid Crystalline Polymers ◽  
Side Chain ◽  
Polarized Optical Microscopy ◽  
Crystalline Polymers ◽  
New Type ◽  
And Performance ◽  
Thermal Stability Of

A new type of able liquid crystalline polymer with a coumarin-containing mesogenic side group that could be photo-crosslinked was synthesized in this paper. The structure of the intermediates, monomers and polymers were characterized with FTIR and 1HNMR measurement. DSC, TG, and hot stage polarized optical microscopy were employed to study the phase transition temperature, mesophase texture, and thermal stability of the liquid crystalline polymers. The results indicated that both the monomer and polymer exhibited liquid-crystalline features over a wide temperature range.

scholarly journals Fabrication of CoFe2O4 Nanowire Using a Double-Pass Porous Alumina Template with a Large Range of Pore Diameters

Crystals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 331
Author(s):  
Wei Chen ◽  
Hui Zheng ◽  
Dongping Hu ◽  
Qiong Wu ◽  
Peng Zheng ◽  
...  
Keyword(s):  
Porous Alumina ◽  
Aluminum Foil ◽  
Nanowire Arrays ◽  
Acid Electrolyte ◽  
Double Pass ◽  
Alumina Template ◽  
Mixed Acid ◽  
Porous Alumina Template ◽  
Electrochemical Deposition Method ◽  
Pmma Filler

In this work, CoFe2O4 nanowire was fabricated by using a self-designed double-pass porous alumina template. The double-pass porous alumina template was prepared by a two-step oxidation method using a mixed acid (phosphoric acid and oxalic acid) electrolyte and polymethyl methacrylate (PMMA) filler. The combustion of aluminum foil at a high voltage has been effectively resolved by using this mixed acid electrolyte. Additionally, the range of pore diameters has been obviously increased to 230–400 nm by using PMMA as the filler, which can prevent contact between the pore and solution when removing the barrier layer. Subsequently, CoFe2O4 ferrite nanowire arrays were successfully fabricated into the double-pass porous alumina template by an electrochemical deposition method, and show an anisotropic feature of magnetic properties.

Sign in / Sign up

Export Citation Format

Share Document