In the current work hydroxyapatite Ca10(PO4)6 ·OH2(HA) was sintered with the addition of 3 wt% aluminum isopropoxide(C9H21AlO3) powder and 3 wt % Teflon powder(-C2 F2-). Sample was prepared by following sol-gel t...
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In the current work hydroxyapatite Ca10(PO4)6 ·OH2(HA) was sintered with the addition of 3 wt% aluminum isopropoxide(C9H21AlO3) powder and 3 wt % Teflon powder(-C2 F2-). Sample was prepared by following sol-gel technique. Obtained pellets of samples were sintered. For investigation of effects of temperature on microstructures and mechanical properties the samples were sintered at various temperatures. For studying the phase composition, microstructures and elemental analysis the sintered samples were characterized by X-rays diffraction(XRD), scanning electron microscopy(SEM) and energy dispersive X-rays diffraction(EDAX) respectively. After sintering the samples mechanical properties, i e, grains size, apparent density, Vickers hardness, bending strength and compressive strength were found to be 2.14-18.76 μm, 1.523 6-0.752 g/cm3, 3.60-0.600 GPa and bending strength 33.265 8-14.900 MPa, 75-33 MPa, respectively. As a result of sintering fluoridated composite material was obtained.
The three-pole electron gun is composed of cathode, anode and grid electrode, which can effectively control the emission beam current and is widely used in welding and additive manufacturing equipment. However, the ch...
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The specific binding of receptor to ligand covalently attached to surface with different surface densities was studied using streptavidin-biotin model pair. Biotinylated substrates with different spacer thicknesses as...
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The specific binding of receptor to ligand covalently attached to surface with different surface densities was studied using streptavidin-biotin model pair. Biotinylated substrates with different spacer thicknesses as formed through a simple reaction between amine immobilized surfaces and N-hydroxysucciimide groups at the end of biotin modifi ed PEG in anhydrous organic solutions（＂grafting to＂ technique）. The amount of the specifi cally adsorbed protein was measured as a function of spacer thickness between hard surface and biotin moieties. It has been shown that the amount of specifically adsorbed streptavidin decreases with the increase spacer thickness and the protein adsorbs onto the functionalized surfaces in a single molecular manner. It provides an interesting model system for studying single molecular interactions.
Ceramic and polytetrafluoroethylene composites as dielectric materials have a low dielectric loss at high frequency and play an important role in the modern communication ***,room temperature phase transformation of P...
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Ceramic and polytetrafluoroethylene composites as dielectric materials have a low dielectric loss at high frequency and play an important role in the modern communication ***,room temperature phase transformation of PTFE resins,which is accompanied by a large volume change(>400 ppm/℃),seriously affects the dimensional stability and performance stability of *** LD125 modified glass fiber(GF)was introduced to the CaO-Li2 O-Sm2O3-TiO2(CLST)/PTFE composite,to reduce the thermal expansion coefficient(CTE)of the *** tri-phase composites(CLST/PTFE/GF)show the low dielectric loss and excellent *** effect of GF content on the dielectric properties and CTE was also *** CLST/PTFE filled with 5%GF exhibits the best overall performance,which is a promising microwave dielectric material for microwave communication.
The homogeneous glass samples of the (1-x)As 2S 3 xCdCl 2 where x=0 and 0.05 were prepared by the conventional melt quenched *** addition of 5mol% CdCl 2 enhanced the glass transition temperature of pure As 2S ...
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The homogeneous glass samples of the (1-x)As 2S 3 xCdCl 2 where x=0 and 0.05 were prepared by the conventional melt quenched *** addition of 5mol% CdCl 2 enhanced the glass transition temperature of pure As 2S 3 glass sample by about 30℃.Based on the experimental data,the microstructure is considered to be that the discrete molecule species of AsCl 3 and nanocrystal CdS is homogeneously dispersed in the disordered polymer network formed by AsS 3 pyramids interconnected by sulfur bridges.
The energy transfer (ET) between f-f transition is achieved by rare earth ions (RE 3+ ) doped grain boundaries of transparent ceramics, which enhances the fluorescence thermometry performance and enables multiple fluo...
The energy transfer (ET) between f-f transition is achieved by rare earth ions (RE 3+ ) doped grain boundaries of transparent ceramics, which enhances the fluorescence thermometry performance and enables multiple fluorescence thermometry modes of transparent ceramics. In this work, MgAlON:Dy 3+ transparent ceramics were prepared and segregation of Dy 3+ in grain boundaries was realized. With excellent absolute and relative sensitivities (2.447 μs/K and 2.09%/K), the fluorescence lifetime (FL) signals of MgAlON:Dy 3+ exceeds most of RE 3+ doped phosphors. The ET between closely segregated Dy 3+ in grain boundaries modifies the distribution of electron on 4 I 15/2 level, and induces temperature-dependent FL to the phosphors. This work reveals the influence of grain boundary segregation on ET between Dy 3+ for improving the fluorescence thermometry performance of phosphors.
Polymer nanosphere-based devices demonstrate exceptional optoelectronic properties due to the surface and size effect. However, the lack of predictive computational models for nanosphere interactions during fabricatio...
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This study investigated the effectiveness of Fe-based metallic glass particles as a reinforcing agent in Cu-based composite coating fabricated by cold spray technology. The cold spray process was conducted under param...
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Nano hafnium carbide（HfC） powders were synthesized by sol-gel combining hightemperature rapid heat treatment process using citric acid and hafnium tetrachloride as the raw materials. The effects of ball milling trea...
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Nano hafnium carbide（HfC） powders were synthesized by sol-gel combining hightemperature rapid heat treatment process using citric acid and hafnium tetrachloride as the raw materials. The effects of ball milling treatment on the phase and morphology of pyrolysis products（HfO_2-C） and final HfC product were investigated and the influences of heat treatment temperature and holding time on the structure and properties of the synthesized hafnium carbide powders were also studied. The experimental results showed that the HfO_2-C powders with good uniformity and small particle size were prepared by controlling the milling time. Pure HfC powders with an average particle size of 500 nm were obtained at 1 700 ℃ with a holding time of 3 min, and the oxygen content was about 0.69 wt%, lower than that of the hafnium carbide powders prepared by SPS（0.97%）.
The piezoelectric strain of K_(0.5)Na_(0.5)NbO_(3)-based lead-free ceramic at different temperatures was *** Rayleigh analysis shows that the intrinsic and extrinsic contributions are increased at temperature from 173...
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The piezoelectric strain of K_(0.5)Na_(0.5)NbO_(3)-based lead-free ceramic at different temperatures was *** Rayleigh analysis shows that the intrinsic and extrinsic contributions are increased at temperature from 173 to 298 *** addition,a monoclinic phase structure was observed at 83 *** results of phase field simulation show that the temperature dependent microstructure evolution is a function of the local structure *** work contributes to understanding the structure and properties relationship of the multi-cations doped KNN-based piezoelectric ceramics as a function of temperature.
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