Effect of Orientation and Wetting Properties on the
· The adhesion force and contact angle of gold-capped silica Janus particles and plain silica particles at an air–water interface are studied via colloidal atomic force microscopy. Particles are attached to cantilevers at various orientations and wetting properties of the gold surface are varied through modification with dodecanethiol. Thiol modification increases the hydrophobicity of the
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Effect of in-situ modification of α-alumina nanoparticles
· The modification of alumina nanoparticles was utilized as an efficient method to enhance the compatibility of Al 2 O 3 nanoparticles with PMMA matrix to improve the mechanical properties of PMMA for biomedical applications. The main corresponding conclusions can be summarized as follows
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4 6-Dimethyldibenzothiophene Hydrodesulfurization on
· The effects of the method of modifying USY zeolite with nickel on the hydrodesulfurization (HDS) of 4 6-dimethyldibenzothiophene (4 6-DMDBT) have been investigated. USY zeolites were modified with a small amount of Ni by three different methods namely the in situ synthesis method the ion-exchange method and the impregnation method and the resulting Ni-modified USY zeolites were
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Effects of alumina bubble addition on the properties of
· Alumina bubble addition is effective in heightening the thermal expansion thermal conductivity of mullite castables and can resist the sharp decrease in thermal expansion above 1300 °C. The addition of alumina bubble can improve the mechanical strength of mullite castables.
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Effect of Li Na and K Modification of Alumina on its
The effect of alkali metal (Li Na K) incorporation on the morphology and water vapor uptake properties of mesoporous Al 2 O 3 has been studied. The modification of the raw material pseudoboehmite represented a mixture of low-temperature phases (γ η χ)-Al 2 O 3 and has been done at low-temperature that does not change the phase ratio.A decrease in specific surface values and an
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Effect of Alumina Contents on the Physicomechanical
Polyester-based composites filled with various contents of alumina (Al 2 O 3 ) (i.e. 0 1 5 and 10 vol ) have been fabricated in this study. Physical and mechanical properties of the composites have also been analysed. The analysis results showed that the experimental density of the polyester/alumina composites was smaller than the theoretical density which could be attributed to the
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Effect of modification of the alumina acidity on the
The effect of alumina acidity change on the properties of sulfided Mo and CoMo has been characterized using transmission electron microscope X-ray photoelectron spectroscopy and IR spectroscopy of CO-adsorption as well as model compound reactions as thiophene hydrodesulfurization (HDS) 4 6-dimethyldibenzothiophene (4 6-DMDBT) HDS and 2 6
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Effect of alumina bubble modification on properties of
· In this work the effects of modification of alumina bubbles with silica sol on the properties of mullite castables were studied. After the alumina bubbles were modified by silica sol the bulk density of the samples was slightly increased and the apparent porosity was decreased.
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Effect of Alumina Contents on the Physicomechanical
Polyester-based composites filled with various contents of alumina (Al 2 O 3 ) (i.e. 0 1 5 and 10 vol ) have been fabricated in this study. Physical and mechanical properties of the composites have also been analysed. The analysis results showed that the experimental density of the polyester/alumina composites was smaller than the theoretical density which could be attributed to the
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Modification of Double Oxide Film Defects with the
· In this work Mo was added into Al melt to reduce the detrimental effect of double-oxide film defect. An air bubble was trapped in a liquid metal (2L99) served as an analogy for double-oxide film defect in aluminum alloy castings. It was found that the addition of Mo significantly accelerated the consumption of the entrapped bubble by 60 pct after holding for 1 hour. 2 sets of testbar molds
Get PriceModification with boehmite-derived alumina nanoparticles
· Nanostructured γ-Al2O3 with an average particle size of 90 nm was synthesized by coated silica in solution. As a type of hard template the coated silica shell layer could decrease the sinter of alumina particles during the phase transition process at 550
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Effect of Li Na and K Modification of Alumina on its
The effect of alkali metal (Li Na K) incorporation on the morphology and water vapor uptake properties of mesoporous Al 2 O 3 has been studied. The modification of the raw material pseudoboehmite represented a mixture of low-temperature phases (γ η χ)-Al 2 O 3 and has been done at low-temperature that does not change the phase ratio.A decrease in specific surface values and an
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Modification with boehmite-derived alumina nanoparticles
· Nanostructured γ-Al2O3 with an average particle size of 90 nm was synthesized by coated silica in solution. As a type of hard template the coated silica shell layer could decrease the sinter of alumina particles during the phase transition process at 550
Get PriceGlass transition temperature of PMMA/modified alumina
· In this study the effect of alumina and modified alumina nanoparticles in a PMMA/alumina nanocomposite was investigated. To attain this goal the glass transition behavior of poly methyl methacrylate (PMMA) PMMA/alumina and PMMA/functionalized alumina nanocomposites were investigated by molecular dynamic simulations (MD).
Get PriceEffect of hydrogen on the integrity of aluminium–oxide
· Hydrogen can facilitate the detachment of protective oxide layer off metals and alloys. The degradation is usually exacerbated at elevated temperatures in many industrial applications however
Get PriceEffect of Surface Functional Modification of Nano-Alumina
· Surface organic molecule modification of nanosized alumina particles is an effective way to improve its dispersion in polymer and to enhance the properties of polymer nanocomposites. In the present study γ -aminopropyl triethoxysilane was used as a surface modification agent to react with the hydroxyl group on the surface of nanosized alumina.
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Modification of Double Oxide Film Defects with the
· In this work Mo was added into Al melt to reduce the detrimental effect of double-oxide film defect. An air bubble was trapped in a liquid metal (2L99) served as an analogy for double-oxide film defect in aluminum alloy castings. It was found that the addition of Mo significantly accelerated the consumption of the entrapped bubble by 60 pct after holding for 1 hour. 2 sets of testbar molds
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Characterization of Modified and Polymer Coated Alumina
· The prepared modified and coated alumina surfaces were characterized by infrared spectroscopy (FTIR) to investigate the surface properties of the individual and double modified samples. FTIR helps in reporting the changes occurred in hydroxyl groups as well as the structure changes as a result of thermal treating hydrothermal treating silylation treating alkali metal treating coating
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Effect of Orientation and Wetting Properties on the
· The adhesion force and contact angle of gold-capped silica Janus particles and plain silica particles at an air–water interface are studied via colloidal atomic force microscopy. Particles are attached to cantilevers at various orientations and wetting properties of the gold surface are varied through modification with dodecanethiol. Thiol modification increases the hydrophobicity of the
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How does rare earth affect the performance of alumina
· The more rare earth oxides are added the more obvious the effect of reducing the sintering temperature but excessive addition will make the mechanical properties of ceramics worse. Influence on the microstructure of alumina ceramics After doping with
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Effect of nano-alumina modified foaming agents on
· Effect of nano-alumina modified foaming agents on foamed concrete3.2.1. Strength drying shrinkage uniformity and water absorption. The effects of foaming agent with and without nano-alumina on the mechanical strength of the foamed concretes are illustrated in Fig. 9. With the increase in time the strength for all samples improved.
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Effect of modification of the alumina acidity on the
The effect of alumina acidity change on the properties of sulfided Mo and CoMo has been characterized using transmission electron microscope X-ray photoelectron spectroscopy and IR spectroscopy of CO-adsorption as well as model compound reactions as thiophene hydrodesulfurization (HDS) 4 6-dimethyldibenzothiophene (4 6-DMDBT) HDS and 2 6-dimethylaniline (DMA) hydrodenitrogenation
Get PriceEffect of Alumina Contents on the Physicomechanical
Polyester-based composites filled with various contents of alumina (Al 2 O 3 ) (i.e. 0 1 5 and 10 vol ) have been fabricated in this study. Physical and mechanical properties of the composites have also been analysed. The analysis results showed that the experimental density of the polyester/alumina composites was smaller than the theoretical density which could be attributed to the
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Effect of binder on the structure and mechanical
· The scientists spend much time on the binders of alumina ceramics and modification of alumina bubbles in order to lower the sintering temperature and improve the strength and quality uniform . The results of different researchers have great differences.
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Effect of Li Na and K Modification of Alumina on its
The effect of alkali metal (Li Na K) incorporation on the morphology and water vapor uptake properties of mesoporous Al 2 O 3 has been studied. The modification of the raw material pseudoboehmite represented a mixture of low-temperature phases (γ η χ)-Al 2 O 3 and has been done at low-temperature that does not change the phase ratio.A decrease in specific surface values and an
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STP1125-EB Effects of Radiation on Materials 15th
Surface Modification of Austenitic 304 Stainless Steel by N 2 and 11 B Ion Implantation. Transient and Static Mechanical Properties of D9 Fuel Pin Cladding and Duct Material Irradiated to High Fluence. Effect of Hold Time and Frequency on the Fatigue Crack Growth Rate of Irradiated Cold-Worked Type 316 Stainless Steel
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Effect of Li Na and K Modification of Alumina on its
The effect of alkali metal (Li Na K) incorporation on the morphology and water vapor uptake properties of mesoporous Al 2 O 3 has been studied. The modification of the raw material pseudoboehmite represented a mixture of low-temperature phases (γ η χ)-Al 2 O 3 and has been done at low-temperature that does not change the phase ratio.A decrease in specific surface values and an
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Surface properties of superfine alumina trihydrate after
· The surface properties of superfine alumina trihydrate (ATH) after surface modification were studied by measuring the contact angle active ratio oil adsorption total organic carbon adsorption ratio and Fourier transform infrared (FTIR) spectrum. The contact angle increased initially and then slowly decreased with an increase of the amount of stearic acid.
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Effect of modification of the alumina acidity on the
The effect of alumina acidity change on the properties of sulfided Mo and CoMo has been characterized using transmission electron microscope X-ray photoelectron spectroscopy and IR spectroscopy of CO-adsorption as well as model compound reactions as thiophene hydrodesulfurization (HDS) 4 6-dimethyldibenzothiophene (4 6-DMDBT) HDS and 2 6
Get Price
