The new type of the hierarchically structured porous solid-acid catalysts described in this presentation possess a remarkable pore system,encompassing well-defined macrochannels,interconnected mesopores,intracrystalli...
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The new type of the hierarchically structured porous solid-acid catalysts described in this presentation possess a remarkable pore system,encompassing well-defined macrochannels,interconnected mesopores,intracrystalline mesopores,and tunable zeolite(ZMS-5,Beta,…)*** hierarchical micro-meso-macroporous zeolitic catalysts with improved stability have been synthesized via a quasi solid state chemical crystallization ***,the catalyst
Spark plasma sintering (SPS) and Self-propagating High-temperature synthesis/ quick pressing (SHS/QP) methods were used to fabricate nanotubes reinforced alumina. The difference in microstructure was discussed. In the...
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Spark plasma sintering (SPS) and Self-propagating High-temperature synthesis/ quick pressing (SHS/QP) methods were used to fabricate nanotubes reinforced alumina. The difference in microstructure was discussed. In the SHS/QP process, the maximum densification temperature is 1660°C and the heating rate is about 1600°C /min. The whole densification process in SHS/QP is very short, which is much beneficial to protect the nanotubes and restrain the growing of grains. The fracture toughness of the sample prepared by SHS/QP is up to 4.9MPam1/2 for 1mass% CNTs/Al2O3 composites, which shows excellent toughening effects of nanotubes.
作者：
Hongtao YuHua HaoHanxing LiuZhongqing Tianyuhongtao2001@***
Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Luoshi Road 122# Wuhan 430070 China People's Republic of 86-27-87864681 86-27-87651779 haohuayang@***
Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan 430070 China People's Republic of lhxhp@***
Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan 430070 China People's Republic of tzqmail@***
Chongqing Institute of Technology Chongqing 400050 China People's Republic of
The effect of CuO on the microstructure and microwave dielectric properties of the CaTiO3-Ca(Zn1/3Nb2/3)O3 ceramics prepared by the conventional solid-method has been investigated. Doped with the 0.5∼1.25wt% CuO powd...
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The effect of CuO on the microstructure and microwave dielectric properties of the CaTiO3-Ca(Zn1/3Nb2/3)O3 ceramics prepared by the conventional solid-method has been investigated. Doped with the 0.5∼1.25wt% CuO powder, the system of which the sintering temperatures were lowered exhibited the orthorhombic perovskite. It can effectively promote the microwave dielectric properties of the 0.3CaTiO3-0.7Ca(Zn1/3Nb2/3)O3 system at lower sintering temperature at the level of 1.0wt% CuO additive. The quality factor increases from 10860 to 13900GHz and not any significant change was observed in the TCF value with fixed CuO additive at different sintering temperature.
Highly oriented titanate nanotube (TNT) film was successfully synthesized by a simple electrophoretic deposition (EPD) method without any hard templates and surfactants. This oriented films adequately utilized the exc...
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Highly oriented titanate nanotube (TNT) film was successfully synthesized by a simple electrophoretic deposition (EPD) method without any hard templates and surfactants. This oriented films adequately utilized the excellent properties of ID nanomaterials such as single crystal semiconductor architectures, large surface area, and superior charge transport, which lead to higher photocatalytic activity. We believe that this versatile method can be extent to fabricate other ordered ID nanomaterials films. [ABSTRACT FROM AUTHOR]
In the present work, silicon nitride nanowires (SNNWs) have been synthesized via nitriding cryomilled nanocrystalline silicon powder. The silicon powder exhibits a fine polycrystalline structure after the cryomilling ...
In the present work, silicon nitride nanowires (SNNWs) have been synthesized via nitriding cryomilled nanocrystalline silicon powder. The silicon powder exhibits a fine polycrystalline structure after the cryomilling process, with an average grain size of 25 to 125 nm at various cryomilling times. The SNNWs that form after the nitridation of the cryomilled silicon powder exhibit single crystal structure and are 20 to 100 nm in diameter and ∼10 µm in length. The diameter of the nanowires is in agreement with the grain size of the cryomilled Si powder. Microstructural characterization reveals that the as-synthesized nanowires have a hexagonal structure and their primary growth direction is along the [0001] direction. The formation of the Si–N–Si bond during the cryomilling process, as investigated theoretically with density functional theory, promotes the subsequent synthesis of the α-Si3N4 nanowires. The mechanism for nanowire formation appears to be a vapor-solid (VS) reaction.
Superparamagnetic FePt nanoparticles (NPs) have attracted considerable attention due to their extremely promising potentials as the diagnostic and therapeutic reagent in biomedical *** the present study,water-soluble ...
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Superparamagnetic FePt nanoparticles (NPs) have attracted considerable attention due to their extremely promising potentials as the diagnostic and therapeutic reagent in biomedical *** the present study,water-soluble FePt NPs about 4 nm in diameter and oil-soluble FePt NPs about 6 nm in diameter were successfully synthesized using amino acids and oleic acid/oleylamine as the capping reagent,*** component,size and magnetic property of FePt NPs were tuned through adjusting the reactant molar ***,the anticancer activities of FePt NPs with different capping reagents were evaluated using different brain tumor cell lines (such as U251,U87,H4) as the *** growth prohibition of tumor cells by NPs was measured through MTT assay,while the interaction of NPs and tumor cells was observed through transmission electron microscopy (TEM).The results show that FePt NPs capped with oleic acid/oleylamine displayed better cytotoxic effects toward brain tumor cells than L-cysteine-capped FePt *** is interesting that the cellular uptake of FePt NPs seem to be similar in three cell *** conclusions,we synthesized successfully superparamagnetic FePt NPs with the different component using different capping reagents,which displayed different anticancer activities on Human brain tumor *** results also provide a promising potential of superparamagnetic FePt NPs as the multifunctional diagnostic and therapeutic reagent in biomedical fields.
Superparamagnetic FePt nanoparticles (NPs) have attracted considerable attention due to their extremely promising potentials as the diagnostic and therapeutic reagent in biomedical *** the present study, we developed ...
Superparamagnetic FePt nanoparticles (NPs) have attracted considerable attention due to their extremely promising potentials as the diagnostic and therapeutic reagent in biomedical *** the present study, we developed a facile route to synthesize water-soluble FePtNPsabout 4 nm in diameter and oil-soluble FePtNPs about 6 nm in diameter using amino acids and oleic acid/oleylamine as the capping reagent, *** component, size and magnetic property of FePt NPs were tuned through adjusting the reactant molar ***, the anticancer activities of FePt NPs were evaluated using different brain tumor cell lines (such as U251, U87, H4) as the *** growth prohibition of tumor cells by NPs was measured through MTT assay, while the interaction of NPs and tumor cells was observed through transmission electron microscopy (TEM).The results show that FePt NPs synthesize by oleic acid/oleylamine shows better cytotoxicity toward brain tumor cells than L-cysteine-synthesized FePt *** cellular uptake, intracellular trafficking, and uptake pathways of FePt NRs in three cells were *** conclusion,we developed a facile synthesis of water-soluble superparamagnetic FePt NPs with the different component and the different anticancer activity of FePt NPs on Human brain tumor cells were *** results provide a promising potential of superparamagnetic FePt NPs as the multifunctional diagnostic and therapeutic reagent in biomedical fields.
Novel CoCrFeNiTiAlx(x:molar ratio, other elements are equimolar) high-entropy alloys were prepared by vacuum arc melting and these alloys were subsequently annealed at 1000°C for 2 h. The annealing effects on str...
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Novel CoCrFeNiTiAlx(x:molar ratio, other elements are equimolar) high-entropy alloys were prepared by vacuum arc melting and these alloys were subsequently annealed at 1000°C for 2 h. The annealing effects on structure and mechanical properties were investigated. Compared with the as-cast alloys, there are many complex intermetallic phases precipitated from the solid solution matrix in the as-annealed alloys with Al content lower than Al1.0. Only simple BCC solid solution structure appears in the as-annealed Al 1.5 and Al2.0 alloys. This kind of alloys exhibit high resistance to anneal softening. Most as-annealed alloys possess even higher Visker hardness than the as-cast ones. The as-annealed Al0.5 alloys shows the highest compressive strength while the Al0 alloy exhibits the best ductility, which is about 2.6 GPa and 13%, respectively. The CoCrFeNiTiAlx high-entropy alloys possess integrated high temperature mechanical property as well.
p-type polycrystalline Si80Ge20Bx(x=0.5, 1, 1.5, 2) alloy were prepared by arc melting and ball milling followed by spark plasma sintering (SPS) method. The phase composition and the microstructure of the bulk were in...
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p-type polycrystalline Si80Ge20Bx(x=0.5, 1, 1.5, 2) alloy were prepared by arc melting and ball milling followed by spark plasma sintering (SPS) method. The phase composition and the microstructure of the bulk were investigated, and their thermoelectric properties were measured form room temperature to 1000K. XRD patterns show that all samples are single phase. No obvious segregation phenomenon was found in the bulks form the FESEM and EDS results. The carrier concentration increased significantly by B-addition. The electrical conductivity was continuously enhanced with increasing B content, while the Seebeck coefficient was decreased. The lattice thermal conductivity was significantly decreased because the phonon scattering was increased by B-doped. The maximum ZT value of 0.78 is obtained at 1000 K for the sample with x=1.
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