In this paper, Fe-Mn-Cu-Co spinel materials with high infrared radiation property were prepared by doping TiO2. The microstructure and infrared radiation with different doping contents of TiO2 were studied. The result...
In this paper, Fe-Mn-Cu-Co spinel materials with high infrared radiation property were prepared by doping TiO2. The microstructure and infrared radiation with different doping contents of TiO2 were studied. The results show that infrared radiation of spinel materials were increased by doping TiO2 and the infrared absorption intensities of diesel oil in the ranges of 3000-2800 and 1500-1300 cm−1 were increased after activated by spinel materials. Diesel surface tension and viscosity were reduced after adding the spinels. When the doping amount of TiO2 was 10%, the effects on the decrease of the surface tension and viscosity reached the maximum.
One-dimensional (1D) anatase TiO2 nanostructures such as nanotubes, nanorods and nanobelts were synthesized by hydrothermal method. These TiO2 nanomaterials with different morphology were used to photocatalytically de...
One-dimensional (1D) anatase TiO2 nanostructures such as nanotubes, nanorods and nanobelts were synthesized by hydrothermal method. These TiO2 nanomaterials with different morphology were used to photocatalytically degrade gaseous benzene with P25 as a comparison. the prepared 1D TiO2 were characterized by XRD, TEM and BET, and the degraded efficiency of benzene and the production of CO2 were detected by Gas Chromatograph. The results showed that the morphology difference led to a significant variation of photocatalytic performance for degradation of gaseous benzene, with the activity order as follows: TiO2 nanotubes > TiO2 nanorods > TiO2 nanobelts > P25 TiO2.
Y2O3, Er2O3 and Nd2O3 doped polycrystalline silicon nitride ceramics were prepared by hot press sintering method at 1850°C and 30 MPa pressure. 1 wt.% of each rare earth oxides (REO) were sintered with 3 wt.% MgO...
Y2O3, Er2O3 and Nd2O3 doped polycrystalline silicon nitride ceramics were prepared by hot press sintering method at 1850°C and 30 MPa pressure. 1 wt.% of each rare earth oxides (REO) were sintered with 3 wt.% MgO, 9 wt.% AlN and 87 wt.% α-*** optical, mechanical and tribological properties of REO doped polycrystalline silicon nitride ceramics were investigated. Optical transmittance was measured in visible and near infrared region and found to be 54% transmittance for Y2O3 doped Si3N4 ceramics. β- phase transformation was suppressed with REO addition. High hardness and high fracture toughness were achieved by addition of REO. Adding REO shows good mechanical properties as high strength and toughness. Coefficient of friction of the REO doped silicon nitride ceramics was lower than that of without REO doped silicon nitride ceramics.
Optical transparency was achieved at infrared region and overall translucent silicon nitride was fabricated using hot press sintering (HPS). The increase in h-BN content decreased the optical transparency. Microstruct...
Optical transparency was achieved at infrared region and overall translucent silicon nitride was fabricated using hot press sintering (HPS). The increase in h-BN content decreased the optical transparency. Microstructral observations shows that the optical, mechanical and tribological properties of BN dispersed polycrystalline Si3N4 ceramics were affected by the density, α:β-phase ratio and content of h-BN in sintered ceramics. The hot pressed samples were prepared from the mixture of α-Si3N4, AlN, MgO and h-BN at 1850°C. The composite contained from 0.25 to 2 mass % BN powder with sintering aids (9% AlN + 3% MgO). Maximum transmittance of 57% was achieved for 0.25 mass % BN doped Si3N4 ceramics. Fracture toughness was increased and wear volume and friction coefficient were decreased with increase in BN content.
The MoxV3−xO7/MWNTs nanocomposites were fabricated via a hydrothermal reaction followed by self-assembling process. The nanocomposites were characterized in terms of surface morphology and structure by FESEM, TEM, XRD...
The MoxV3−xO7/MWNTs nanocomposites were fabricated via a hydrothermal reaction followed by self-assembling process. The nanocomposites were characterized in terms of surface morphology and structure by FESEM, TEM, XRD and XPS analysis, respectively. The electrochemical behaviors of the nanocomposites were investigated by galvanostatic charge-discharge test and cyclic voltammetry. The results showed that MoxV3−xO7/MWNTs nanocomposites had great cycleability as well as capacity characteristics, which was 277.4 mAh/g in the first discharge process and remained 207.9 mAh/g after fiftieth discharge cycle. In the rapid charge-discharge test, the capacity rate still remained 88.6 % after twentieth cycles at 1.2 C discharge.
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 ...
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The small punch creep (SP-C) test technique is a new method which is applied to evaluate the high temperature creep properties of materials by using miniature specimen. In the present paper, the Finite Element Method ...
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Polypyrrole-coated V 2 O 5 nanotubes hybrid materials have been synthesized through an in situ polymerization of pyrrole monomers in the presence of prepared V 2 O 5 nanotubes. The hybrids were characterized by scan...
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ISBN:
(纸本)9781424435432;9781424435449
Polypyrrole-coated V 2 O 5 nanotubes hybrid materials have been synthesized through an in situ polymerization of pyrrole monomers in the presence of prepared V 2 O 5 nanotubes. The hybrids were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Experimental data showed that polypyrrole was uniformly coated on the surface of the V 2 O 5 nanotubes, and the polypyrrole coating is 30 nm thick. Gas sensing tests showed that the hybrids possessed very high sensitivity to ethanol gas at room temperature, implying its potential application for gas sensors.
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