In the present study, Fe-Si sheets were formed by powder rolling of Fe-6.5wt%Si mixture powders, then were sintered in flowing Ar+5vol%H2 atmosphere. The changes in microstructure and density during the formation proc...
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In the present study, Fe-Si sheets were formed by powder rolling of Fe-6.5wt%Si mixture powders, then were sintered in flowing Ar+5vol%H2 atmosphere. The changes in microstructure and density during the formation process were mainly discussed. The results show that Fe-Si mixture powders can be rolled into comparatively compact sheets. During subsequent sintering and re-rolling, the density of the sheet gradually increased and Si diffused into Fe lattice step by step with the increasing of temperature.
作者：
王友法Biomedical Materials and Engineering Research Center
Wuhan University of TechnologyWuhan 430070ChinaState Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China
Inorganic nanoparticles were used to treat cancer cells us well as normal cells. Ca9Sr（ PO4）6（OH）2 nanopartides were prepared through homogeneous precipitation method. Strontium hydroxide, calcium hydroxide solat...
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Inorganic nanoparticles were used to treat cancer cells us well as normal cells. Ca9Sr（ PO4）6（OH）2 nanopartides were prepared through homogeneous precipitation method. Strontium hydroxide, calcium hydroxide solation and monocalcium phosphate were used as initial materials. The strontium-doped hydroxyapatite nanoparticles were characterized by XRD, PCS and AFM. The nanoparticles were applied to interact with human bepatocellular carcinoma cells Bel-7402 and nornud liver cells L-02. Experimental results revealed that nano strontium-strontium apatiw has different bioeffects on proliferation of these two kinds of cells.
The HAP nanoparticles were synthesized with a chemical co-precipitation method. It was monodispersed in needle shape, Its average diameter was 30 nm and length was 70 nm. Human liver cancer cells and normal hepatic ce...
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The HAP nanoparticles were synthesized with a chemical co-precipitation method. It was monodispersed in needle shape, Its average diameter was 30 nm and length was 70 nm. Human liver cancer cells and normal hepatic cells were treated by hydroxyapatite nanopartides. SR-XRF analysis was used to detect the content variation of calcium and phosphor elements in cancer cells when the cells were treated by hydroxyapatite nanoparticles. It was introduced to reveal the anti-cancer mechanism of HAP nanoparticles. Experiments verified that the contents of calcium and phosphor elements in hepatocelltdar carcinoma had been obviously increased after the cells were treated by hydroxyapatite nanoparticles. And the contents increased with hydroxyapatite concentration and treatment time increasing. The Ca/P molar ratio in treated cell was different from both that in hydroxyapatite and that in untreated cancer cell. Apatite nanoparticles evidently altered the calcium and phosphor environmeats in treated hepatocellalar carcinoma cells. That finally halted the proliferation of carcinoma cells.
A hydrocarbon proton exchange membrane, the sulfonated styrene/butylene-ethylene/styrene (s-SEBS) three blocks copolymer membrane was prepared. The performance and microstructure of membranes were investigated. The su...
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A hydrocarbon proton exchange membrane, the sulfonated styrene/butylene-ethylene/styrene (s-SEBS) three blocks copolymer membrane was prepared. The performance and microstructure of membranes were investigated. The sulfonic groups determined by a FT-IR were on the parapositions of phenyls of PS blocks. The conductivity, water uptake, swelling and hydration coefficient all increase drastically when sulfonation degree came to 15 percent, which exhibited the percolation threshold. Then the first three kept slow increasing with the sulfonation degree growing, but the hydration coefficient came to the peak when the sulfonation degree was about 20. AFM showed that suffocated PS phases were the cylinder structure with 20-30 nm.
A new organic-inorganic hybrid compound （dienHs）2（P2Mo5O23） （1） [dien=NH（CH2CH2NH2）2] has been hydrothermally synthesized and characterized by elemental analyses, IR spectrum, thermogravimetric analysis, and t...
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A new organic-inorganic hybrid compound （dienHs）2（P2Mo5O23） （1） [dien=NH（CH2CH2NH2）2] has been hydrothermally synthesized and characterized by elemental analyses, IR spectrum, thermogravimetric analysis, and the single crystal X-ray diffraction technique. Compound 1 crystallizes in the triclinic system with space group P1 and a=0.9790（2） nm, b=0.9922（2） nm, c= 1.4644（3） nm, α=95.510（10）°, β=98.860（10）°, γ=95.700（10）°, V=1.3895（5） nm^3, Z=2, R=0.0465. The results show that the compound consists of dienH3^3＋＋ and P2Mo5O23^6-, and the heteropoly anion P2Mo5O23^6- is connected to a 1-D chain structure with the protonated dien by hydrogen bonds.
TiO2 thin films were prepared on soda lime glass, fused quartz and stainless steel substrates by liquid phase deposition (LPD) method from a (NH4)2TiF6 aqueous solution upon the addition of boric acid (H3BO3), and the...
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TiO2 thin films were prepared on soda lime glass, fused quartz and stainless steel substrates by liquid phase deposition (LPD) method from a (NH4)2TiF6 aqueous solution upon the addition of boric acid (H3BO3), and then calcined at 500°C for 2 h. The prepared films were characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). It was found that the substrates obviously influenced the element composition and microstructure of TiO2 thin films. Except Ti, O and a small amount of F and N elements, which came from the precursor solution, some Si (or Fe) element in the thin films deposited on soda lime glass and quartz substrates (or on stainless steel substrate) was confirmed. The Si (or Fe) element in the thin films could be attributed to two sources. One was from the SiF 62- ions (or FeF62- ions) formed by a reaction between the treatment solution and soda lime glass or quartz (or stainless steel) substrates. The other was attributed to the diffusion of Si (or Fe) from the surface of substrates into the TiO2 thin films after calcination at 500°C. The Si (or Fe) element in the TiO2 thin films could behave as a dopant and resulted in the formation of composite SiO2/TiO2 (or Fe2O3/TiO2) thin films on the substrates.
In liquid composites molding (LCM) processes,a gap between the perform and the mold edge can create a preferential flow path for the resin, which is the so-called edge effect. The resin flow behaviors in different gap...
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In liquid composites molding (LCM) processes,a gap between the perform and the mold edge can create a preferential flow path for the resin, which is the so-called edge effect. The resin flow behaviors in different gaps were studied by the unidirectional flow method together with the equivalent permeability tensor of flow path computed by two geometric models. In addition, the filling process was simulated to predict the influences of edge effects on the flow pattern. It is found out that even small gaps would disturb the edge flow. The simulation shows good agreement with the experiments.
In this paper, transparent Li2O-Al2O 3-SiO2 system glass-ceramic with low expansion was prepared by melting method, using SiO2, Al2O3 Li2CO3 as raw materials, a small amount of alkaline-earth metal oxide, clarify addi...
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In this paper, transparent Li2O-Al2O 3-SiO2 system glass-ceramic with low expansion was prepared by melting method, using SiO2, Al2O3 Li2CO3 as raw materials, a small amount of alkaline-earth metal oxide, clarify additive and nucleating agent (TiO2, ZrO 2). The glass-ceramic was nucleated and crystallized under different temperature and time, according to the DTA. The results show that the glass-ceramic of Li2O-Al2O2-SiO2 system could be obtained by being nucleated at 550°C for 2 hours and crystallized at 550°C for 1 hour. The system was fully compact. The crystal size in the glass-ceramics was small and homogenous, and its main crystalloid was β-quartz. The expansion coefficient of the glass-ceramics was 2.262×10-7/°C(0 [similar to] 900°C)and the density was 2.5 g/cm3.
The influences of sintering temperature, soaking time and annealing time on the quality factor of Ba(Mg/13Nb2/3)O3 microwave dielectric ceramic were investigated. The result showed that Qf value increased as the sinte...
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The influences of sintering temperature, soaking time and annealing time on the quality factor of Ba(Mg/13Nb2/3)O3 microwave dielectric ceramic were investigated. The result showed that Qf value increased as the sintering temperature increasing. It was ascribed to the increasing of the relative density and ordering parameter S. The maximum value of Qf, 49500 GHz, was gained at 1550°C. With soaking time increasing, Qf value increased. The increasing of B-site 1:2 ordering degree and grain size should be responsible for the improvement of Qf value. When soaking time was 16 h, Qf value reached 58000 GHz. Annealing time had great effect on Qf value. With annealing time increasing, Qf value increased quickly. This was because of the improvement of B-site 1:2 ordering caused by annealing. A high Qf value, 71500 GHz, was acquired when annealing time was 48 h.
The nano particles of angelica were prepared by high-speed centrifugal sheering (HSCS) pulverizer. The particles were characterized by ZetaPALS light scattering granulometric analyzer, optical microscope and SEM. HPLC...
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The nano particles of angelica were prepared by high-speed centrifugal sheering (HSCS) pulverizer. The particles were characterized by ZetaPALS light scattering granulometric analyzer, optical microscope and SEM. HPLC was employed to determine the content of ferulic acid, which is the indes ingredient of angelica. Experimental results showed that the average size of solid particle was 76.5 nm after nano-pulverization. The great majority of the plant cell was broken. After nano-pulverization, extraction percent of ferulic acid was increased by 12.95%.
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