38 results on '"Zhiliang Huang"'
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2. Preparation and growth mechanism of the flower-like whiskers of γ-, θ-, and α-Al2O3 phases by homogeneous precipitation/calcination method
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Jiarui Fu, Shi Chen, Zhiliang Huang, Changlian Chen, Yan Xia, Yuan Jiang, Lu Lu, Xu Zhao, and Jiangsheng Huang
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010302 applied physics ,Boehmite ,Thermogravimetric analysis ,Materials science ,Scanning electron microscope ,Process Chemistry and Technology ,Whiskers ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,law.invention ,Chemical engineering ,law ,Whisker ,Differential thermal analysis ,visual_art ,0103 physical sciences ,Materials Chemistry ,Ceramics and Composites ,visual_art.visual_art_medium ,Calcination ,Ceramic ,0210 nano-technology - Abstract
The different alumina whiskers phases are extensively used to reinforce high-performance composite materials. The understanding of the mutual relationship of the different phases is key for simulating Al2O3 whiskers containing systems and is of general interest for the metal oxide and ceramic communities. In this paper, we used homogeneous precipitation to synthesized flower-like boehmite whisker precursors from aluminum sulfate and urea. The synthesized precursors were calcined at 600, 900, and 1200 °C to obtain flower-like whiskers of γ-, θ-, and α-Al2O3 phases, respectively. The precursor boehmite crystals prepared in closed, semi-closed, and open reactor systems were qualitatively analyzed using SEM. The results showed that the usea hydrolysis, which serves as a source of OH− ions, is slow under closed-reactor conditions, which favors the growth of the boehmite crystal nuclei into whiskers. We adopted the L16 (43) orthogonal design of experiment to analyze the influence of reaction temperature, time, and the amount of urea (relative to the amount of Al2(SO4)3) in the closed system. Synthesis temperature of 160 °C and the processing time of 8 h yielded optimal boehmite flower-like whiskers. Physicochemical properties of the precursor and series of alumina phases were characterized using thermogravimetric/differential thermal analysis (TG/DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscopy (AFM) methods. Finally, the obtained results and the thorough analysis of the growth mechanism suggested the step-growth model of boehmite flower-like whiskers. more...
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- 2021
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Catalog
3. Preparation of V doped lanthanum silicate electrolyte ceramics by combustion method and study on conductance mechanism
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Chang Sheng Wu, Yuan Jiang, Zhiliang Huang, Shi Chen, Chang Lian Chen, and Mian Lu
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Marketing ,Materials science ,Doping ,Conductance ,chemistry.chemical_element ,Electrolyte ,Condensed Matter Physics ,Combustion ,Silicate ,chemistry.chemical_compound ,Chemical engineering ,chemistry ,visual_art ,Materials Chemistry ,Ceramics and Composites ,Lanthanum ,visual_art.visual_art_medium ,Ceramic ,Mechanism (sociology) - Published
- 2021
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4. Preparation and characterization of water-based concentrated carbon nanotubes slurry with high dispersibility and stability
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Song Zhang, Man Xu, Liang Li, Shicong Zhou, Wang Cuican, Xin Liang, Zhiliang Huang, and Changlian Chen
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010302 applied physics ,Materials science ,Process Chemistry and Technology ,Infrared spectroscopy ,02 engineering and technology ,Carbon nanotube ,021001 nanoscience & nanotechnology ,Electrostatics ,01 natural sciences ,Water based ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,law.invention ,Characterization (materials science) ,Light intensity ,Chemical engineering ,law ,0103 physical sciences ,Materials Chemistry ,Ceramics and Composites ,Zeta potential ,Slurry ,0210 nano-technology - Abstract
In order to apply the excellent properties of carbon nanotubes to the field of biomedicine, water-based high concentration carbon nanotubes(CNTs) slurry with high dispersibility and stability was prepared by adjusting illumination conditions and pH values. The infrared spectroscopy, zeta potential, TEM and digital camera were used to investigate the effect of illumination conditions and pH values on the dispersibility and stability of the CNTs slurry. The results show that the CNTs slurry has more functional groups and can be sufficiently oxidized in the absence of light than in the natural and intense light conditions. And the higher light intensity used for oxidation treatment caused a decrease of the functional groups and the surface activity of the CNTs in the slurry. The increase of the pH value can promote electrostatic repulsion, and the enhancement of light intensity can decrease the electrostatic repulsion. So, the CNTs individuals oxidized in the absence of light possessed high dispersibility and stability as varying pH value from 11.5 to 4, which slurry concentration is 10 wt% and no CNTs settlement was observed for nearly one year. However, the CNTs in the water-based carbon nanotube slurry prepared under other illumination conditions re-agglomerated and settled after several days, especially when the pH value is below 4. more...
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- 2019
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5. Preparation and characterization of porous Si3N4-bonded SiC ceramics and morphology change mechanism of Si3N4 whiskers
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Shicong Zhou, Xin Liang, Maya Luo, Changlian Chen, Zhiliang Huang, Jiayou Ji, and Man Xu
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010302 applied physics ,Materials science ,Morphology (linguistics) ,Silicon ,Scanning electron microscope ,Process Chemistry and Technology ,Whiskers ,chemistry.chemical_element ,Sintering ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry ,Flexural strength ,Chemical engineering ,visual_art ,0103 physical sciences ,Materials Chemistry ,Ceramics and Composites ,visual_art.visual_art_medium ,Ceramic ,0210 nano-technology ,Porosity - Abstract
Porous Si3N4-bonded SiC ceramics with high porosity were prepared by the reaction-sintering method. In this process, Si3N4 was synthesized by the nitridation of silicon powder. The X-ray diffraction (XRD) indicated that the main phases of the porous Si3N4-bonded SiC ceramics were SiC, α-Si3N4, and β-Si3N4, respectively. The contents of β-Si3N4 were increased following the sintering temperature. The morphology of Si3N4 whiskers was investigated by scanning electron microscope (SEM), which was shown that the needle-like (low sintering-temperature) and rod-like (higher sintering-temperature) whiskers were formed, respectively. From low to high synthesized temperature, the highest porosity of the porous Si3N4 bonded SiC ceramic was up to 46.7%, and the bending strength was ~11.6 MPa. The α-Si3N4 whiskers were derived from the reaction between N2 and Si powders, the growth mechanism was proved by Vapor–Solid (VS). Meanwhile, the growth mechanism of β-Si3N4 was in accordance with Vapor–Solid–Liquid (VSL) growth mechanism. With the increase of sintering temperature, Si powders were melted to liquid silicon and the α-Si3N4 was dissolved into the liquid then the β-Si3N4 was precipitated successfully. more...
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- 2019
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6. A micro-structural corrosion mechanism on the thermal degradation of BaMgAl10O17: Eu2+ phosphor
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Junjie Xia, Weikang Peng, Zhanhui Zhang, Shijin Kong, Tonggang Qi, and Zhiliang Huang
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Materials science ,Phosphor ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Corrosion ,Ion ,010309 optics ,Chemical engineering ,X-ray photoelectron spectroscopy ,0103 physical sciences ,Thermal ,Activator (phosphor) ,Electrical and Electronic Engineering ,0210 nano-technology ,Luminous efficacy ,Luminescence - Abstract
The thermal degradation is a vital issue that restricting luminous efficiency and service life of BaMgAl10O17: Eu2+phosphor for chromogenic and illuminating fields. The effects of heat-treatment temperature on the luminescence properties and micro-structure of BAM were researched to accurately elucidate the thermal degradation mechanism. Some pieces of evidence for micro-structural corrosion were detected according to the results of PL, TL, XPS and IR. With the heat-treatment temperature increasing, a decrease of blue-emitting intensity and new red-emitting peaks revealed thermal degradation and activator oxidation. The XPS results showed the surface chemical composition changes and the micro-structure adjustment. The defects elimination detected by TL could be responsible for this micro-structural corrosion. IR results further confirmed the changes on bond forms. These were direct evidence and specific forms for the micro-structural corrosion due to the thermal degradation. Based on the relationship between micro-structural corrosion and luminescence properties, a micro-structural corrosion mechanism was given for the thermal degradation of BAM phosphor. The thermal degradation was caused in parallel by the micro-structure corrosion and the activated ion (Eu2+) oxidation. more...
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- 2019
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7. Improved thermal stability of Y3Al5O12:Ce3+ phosphor by SiO2 coating
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Shijin Kong, Wubin Dai, Zhiliang Huang, Weikang Peng, Zhanhui Zhang, and Tonggang Qi
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Materials science ,Precipitation (chemistry) ,Phosphor ,02 engineering and technology ,General Chemistry ,engineering.material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Thermoluminescence ,0104 chemical sciences ,Crystal ,Coating ,Chemical engineering ,engineering ,General Materials Science ,Thermal stability ,0210 nano-technology ,Luminescence ,Layer (electronics) - Abstract
In this paper, a heterogeneous precipitation method was adopted to coat a SiO2 layer on the surface of Y3Al5O12:Ce3+ phosphor. The surface morphologies, crystal phases, defect concentrations, luminescent properties and thermal stability of coated phosphors were investigated and compared with those of uncoated phosphor. A compact and homogeneous SiO2 layer on the surface of phosphor was determined by SEM-EDS, TEM, XRD and FT-IR results. Two thermoluminescent peaks were found at 112 °C and 248 °C on the thermoluminescence spectrum. Their intensities decreased slowly with the increasing coating amounts. It indicated that their corresponding defect concentrations were gradually reduced. Improved thermal stability was obtained by SiO2 coating in spite of a slight weakening of the emission intensity. The optimum theoretical coating amount was identified as 4%. Moreover, a structural modification mechanism on improved thermal stability of SiO2 coated Y3Al5O12:Ce3+ was proposed. more...
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- 2019
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8. Self-assembly pore-forming mechanism of foam boundary templates and the preparation of porous strontium hydroxyapatite microspheres by homogeneous precipitation
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Zhiliang Huang, Yilin Cheng, Donghui Yao, Jiangsheng Huang, Changlian Chen, and Changsheng Wu
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Double layer (biology) ,Materials science ,Bubble ,Ethylenediaminetetraacetic acid ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Kelvin equation ,0104 chemical sciences ,Ion ,symbols.namesake ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,symbols ,General Materials Science ,Chelation ,Self-assembly ,0210 nano-technology ,Porosity - Abstract
Using ethylenediaminetetraacetic acid (EDTA) as a chelating agent and urea as a directional template, we report an effective method for the synthesis of porous strontium hydroxyapatite (SrHAp) microspheres employing homogeneous precipitation. More importantly, we can easily control the pore size (d) of porous SrHAp microspheres through the elaborate choice of reaction temperature (T) at atmospheric pressure. The experimental results show that the d of porous SrHAp microspheres rises gradually with the increase of T. In addition, with the increase of reaction time at the same T, the d of the microspheres remained unchanged, but the diameter of porous SrHAp microspheres gradually increased, and remained unchanged after 36 h. According to the Laplace equation, Kelvin equation and Clapeyron equation, the relationship of d and T is deduced as follows: . The experimental data (T, d) agreed with it. In particular, based on the unique role of EDTA and CO2 bubbles (urea hydrolysis) in the preparation of porous SrHAp microspheres, the self-assembly pore-forming mechanism of foam boundary templates was proposed. First, urea was hydrolyzed to produce CO2 bubbles (foam boundary template) and OH−, and EDTASr (EDTA chelates strontium ions) and H3O+ (acidic system) formed a liquid film-chelating ion electronic double layer (LFCIEDL) on the surface of CO2 bubbles, which not only chelated and located Sr2+, but also formed a stable foam boundary template. Secondly, Sr2+, H2PO4− and OH− were homogeneously nucleated in the Plateau borders among the bubbles. After that, along the bubble liquid film surface, Sr2+ is orientationally released from the outer edge to the inner. SrHAp lamellae were formed by self-assembly method, then they were interconnected. In addition, OH− produced by urea hydrolysis continuously provides power for self-assembly oriented growth. Finally OH− completely destroys the LFCIEDL on the surface of the bubble, causing the bubble to break, and the porous SrHAp microspheres are formed. more...
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- 2019
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9. Preparation and growth mechanism of plate-like basic magnesium carbonate by template-mediated/homogeneous precipitation method
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Zhiliang Huang, Chang-lian Chen, Wen-zhao Li, Wei-rong Xu, and Juan Chen
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Morphology (linguistics) ,Materials science ,Magnesium ,Scanning electron microscope ,Metals and Alloys ,General Engineering ,Nucleation ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Surface energy ,0104 chemical sciences ,chemistry.chemical_compound ,Chemical engineering ,chemistry ,Phase (matter) ,Urea ,0210 nano-technology ,Fire retardant - Abstract
In order to expand the application of the basic magnesium carbonate in the field of flame retardant, the plate-like basic magnesium carbonate (Mg5(CO3)4(OH)2.4H2O) was prepared successfully by template-mediated/ homogeneous precipitation method, using magnesium chloride hexahydrate (MgCl2.6H2O) and urea (CO(NH2)2) as reaction materials. Phase and morphology of the product were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and atomic force microscope (AFM), respectively. The results showed that well-crystallized plate-like Mg5(CO3)4(OH)2.4H2O can be prepared at the water bath temperature of 100 °C, water bath time of 24 h, the aging time of 5 h after adding organic template agent. The investigation on organic template mediated mechanism shows that the template affects the crystal morphology by changing surface energy of different crystal plane. Through a preliminary study on the growth mechanism of the product, it is found that the generation of the plate-like Mg5(CO3)4(OH)2.4H2O could be explained by two-dimensional nucleation/step growth mechanism. more...
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- 2018
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10. Preparation of praseodymium-doped La9.33(SiO4)6O2 apatite-type solid electrolytes and analysis of the conductivity mechanism
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Changsheng Wu, Shi Chen, Jiangsheng Huang, and Zhiliang Huang
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Materials science ,chemistry ,Chemical engineering ,Praseodymium ,visual_art ,Doping ,visual_art.visual_art_medium ,Fast ion conductor ,chemistry.chemical_element ,Conductivity ,Mechanism (sociology) ,Apatite - Abstract
In order to improve the electrical conductivity of lanthanum silicate oxide electrolyte (LSO), La9.33Pr x Si6O26+1.5x (LPSO) solid electrolyte powder doped with praseodymium was synthesized at 600 °C by urea-nitrate combustion method with lanthanum oxide (La2O3) and Praseodymium nitrate hexahydrate (Pr(NO3)3·6H2O) as raw materials. It is shown that the Pr-doped LSO still have the typical apatite structure and occupy the LaII cation vacancy at the 6h position. Optimal sintering temperature is 1550 °C. La9.33Pr0.5Si6O26.75 reaches the highest conductivity (4.80×10−4 S·cm−1 at 600 ºC). The main factor that Pr-doped improves the performance of LSO is that Pr-doped that introduced more interstitial oxygen ions Oi* and increased lattice volume, so improved the transport efficiency of interstitial oxygen. The secondary factor is the decrease in the concentration of cation vacancy after Pr-doped, which reduced the negative defect stacking centers. Thereby, decreases space drag of interstitial oxygen transport which increases conductivity of LSO. The praseodymium doped to enhancement LSO conductivity mechanism that interstitial oxygen concentration-cation vacancies concentration-lattice volume composite enhancement mechanism was proposed. more...
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- 2021
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11. Study on TiO2 Coated Y3Al5O12: Ce3+ Phosphor
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Weikang Peng, Zhanhui Zhang, Zhiliang Huang, Zhouqiao Zhao, and Bingbing Pan
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Diffraction ,Morphology (linguistics) ,Materials science ,chemistry ,Chemical engineering ,Scanning electron microscope ,Phase (matter) ,chemistry.chemical_element ,Sem analysis ,Phosphor ,Titanium - Abstract
In this paper,a sol-gel method using tetrabutyltitanate as titanium source was adopted to coat a TiO2layer on the surface of Y3Al5O12:Ce3+ (YAG) phosphor. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to analyze the phase and surface morphology of the phosphor. XRD and SEM analysis showed that the surface of YAG phosphor was successfully coated by TiO2. more...
- Published
- 2019
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12. Preparation and Characterization of Silicon Nitride Bonded Silicon Carbide Ultrafiltration Membrane
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Sichong Zhou, Xin Liang, Chang-Lian Chen, Zhiliang Huang, and Dong Ma
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Materials science ,Silicon ,Ultrafiltration ,chemistry.chemical_element ,Sintering ,chemistry.chemical_compound ,Membrane ,chemistry ,Silicon nitride ,Chemical engineering ,visual_art ,Silicon carbide ,visual_art.visual_art_medium ,Ceramic ,Yttria-stabilized zirconia - Abstract
Silicon nitride-bonded silicon carbide multiphase ceramic ultrafiltration membranes were prepared by using SiC, silicon powder and nitrogen as raw materials and yttrium oxide as sintering aids. The membranes were characterized by XRD and SEM. The effects of different amounts of SiC on the crystal growth and properties of multiphase ceramic ultrafiltration membranes were investigated. When SiC is 10g, silica powder is 0.75g and yttria is 0.5g, the properties of the ceramic membranes are better, and the average pore size distribution is about 0.1μm.1 more...
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- 2019
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13. Synthesis and Conductivity Investigation of Cu Doped Apatite Type Lanthanum Silicate Electrolyte
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Qian Zi Li, Juan Chen, Zhiliang Huang, and Wen Zhao Li
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Materials science ,Mechanical Engineering ,Doping ,Inorganic chemistry ,Sintering ,chemistry.chemical_element ,Electrolyte ,Conductivity ,Silicate ,Apatite ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Mechanics of Materials ,visual_art ,visual_art.visual_art_medium ,Lanthanum ,General Materials Science ,Ceramic - Abstract
In this paper, Cu-doped lanthanum silicate electrolyte (La9.33Si6-xCuxO26-x) precursor was synthesized by urea-nitrate combustion method using La2O3, CuO and TEOS as raw materials. The as-prepared precursor was lighted at 600 °C and sintered at 800 °C. The sintered powder samples were grinded and mixed absolutely by ball milled. Finally, we preformed and sintered powder samples to synthesis Cu-doped lanthanum silicate ceramics. Ac impedance method and analysis was used to test conductivity of as-prepared electrolyte, investigated the influence of balling time, sintering temperature and doping content on conductivity property of LSO sintered product. The final result shows that best balling time is 3 h, secondary sintering temperature is 1500 °C and the doping content is 0.3. Under this condition, the conductivity of Cu-doped lanthanum silicate electrolyte could reach 7.28×10-3 s/cm at 700 °C. more...
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- 2017
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14. Microwave-assisted synthesis of Mn3O4 nanoparticles@reduced graphene oxide nanocomposites for high performance supercapacitors
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Xinmin Zhang, Jingya Liu, Songmin Shang, Xianghua Yu, Zhiliang Huang, Liang Li, and Xiao She
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Nanocomposite ,Materials science ,Graphene ,Mechanical Engineering ,Analytical chemistry ,Oxide ,Infrared spectroscopy ,Condensed Matter Physics ,Nanomaterials ,law.invention ,symbols.namesake ,chemistry.chemical_compound ,Chemical engineering ,chemistry ,Mechanics of Materials ,law ,symbols ,General Materials Science ,Fourier transform infrared spectroscopy ,Raman spectroscopy ,Graphene oxide paper - Abstract
One-step microwave-assisted synthetic route for the fabrication of Mn 3 O 4 nanoparticles@reduced graphene oxide (Mn 3 O 4 @rGO) nanocomposites has been demonstrated. The morphological structures of the nanocomposites are characterized by Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray diffraction (XRD), thermogravimetric analyses (TGA), and scanning electron microscopy (SEM), respectively. All of the results indicate that the microwave-assisted synthesis results in the growth of Mn 3 O 4 and the reduction of graphene oxide simultaneously in ethylene glycol-water system. The specific capacitance of the as-prepared Mn 3 O 4 @rGO nanocomposite is higher than those of rGO and pure Mn 3 O 4 , which indicates the synergetic interaction between rGO and Mn 3 O 4 . The nanocomposites also have good rate capability and cycling stability in electrochemical experiments. This facile technique may be extended to the large scale and cost effective production of other composites based on graphene and metal oxide for many applications. more...
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- 2015
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15. Assembly of conducting polypyrrole hydrogels as a suitable adsorbent for Cr(VI) removal
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Xianghua Yu, Xiaoya Zhang, Zhiliang Huang, Jingya Liu, Sibo Li, and Liang Li
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Materials science ,Aqueous solution ,Polymers and Plastics ,Nanoparticle ,General Chemistry ,Condensed Matter Physics ,Polypyrrole ,chemistry.chemical_compound ,Monomer ,Adsorption ,chemistry ,Polymerization ,Chemical engineering ,Ionic strength ,Self-healing hydrogels ,Polymer chemistry ,Materials Chemistry - Abstract
Unique polypyrrole (PPy) hydrogels are prepared by using orange IV as the dopant and FeCl3 as the oxidant. The static polymerization of pyrrole monomer in aqueous solution is accompanied with self-assembly of PPy hydrogel. PPy hydrogels not only show good electrical conductivities, but also exhibit excellent water-absorbent behaviors. The macroscopic appearance, microscopic morphology and water-absorbent behaviors of PPy hydrogels can be controlled by the choice of the reaction condition. The effects of ionic strength on the physical properties of PPy hydrogels are also studied. The results indicate that PPy hydrogels show improved water absorbencies in saline solution. Moreover, PPy hydrogel is used as an efficient adsorbent to remove Cr(VI) from aqueous solutions. PPy hydrogel exhibits much better adsorption performance than common PPy nanoparticles. This kind of PPy hydrogel is expected to be a potential candidate for water treatment. more...
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- 2015
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16. Silicon Carbide Films Prepared by Silicon Nitride Evaporation
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Shicong Zhou, Xin Liang, Gangqiang Ding, Changlian Chen, Jiayou Ji, Hongliang Zhang, Man Xu, and Zhiliang Huang
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010302 applied physics ,Diffraction ,Materials science ,Silicon ,Scanning electron microscope ,chemistry.chemical_element ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Evaporation (deposition) ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Silicon nitride ,0103 physical sciences ,Silicon carbide ,Graphite ,0210 nano-technology - Abstract
Silicon carbide (SiC) films were synthesized on graphite substrates using silicon nitride (Si3N4) as silicon source at 1850°C, 1950°C, 2050°C and 2150°C, respectively. The characteristics of the synthesized films were analyzed by X-ray diffraction and scanning electron microscopy. The results show that the synthesis reaction can take place above 1850°C, and the SiC films were β-SiC. With the increase of temperature, the size of SiC particles increases, and when the soaking time is too short, the SiC particles are connected in a large area. Through the analysis of the films synthesis process, it is inferred that the growth of the SiC films belongs to the gas-solid growth mechanism. more...
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- 2019
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17. Reduction of Ilmenite Through Microwave Plasma
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Zhiliang Huang, Wenbo Zhang, Mingyang Wang, Shenggao Wang, Chuanbo Xu, Kaiwei Xu, Chuanxin Wang, and Jianhua Wang
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Materials science ,Hydrogen ,Composite number ,Kinetics ,Mineralogy ,chemistry.chemical_element ,Chemical vapor deposition ,engineering.material ,Condensed Matter Physics ,Ion source ,chemistry ,Chemical engineering ,Scientific method ,engineering ,Microwave ,Ilmenite - Abstract
Ilmenite was reduced through microwave plasma-assisted chemical vapor deposition with continuously flowing hydrogen and methane gas. The reduction products were analyzed by XRD and SEM technology, and the component products were TiO2-Carbon Nanotubes (CNTs) composite powders. The reduction process was in good agreement with the Jander equation. Compared with other reduction process by kinetics analysis, microwave plasma could significantly facilitate the reduction process at low temperature. more...
- Published
- 2013
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18. Preparation of Aragonite Whiskers by Dolomite
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Wei-rong Xu, Juan Chen, and Zhiliang Huang
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Materials science ,Morphology (linguistics) ,Scanning electron microscope ,Whiskers ,Aragonite ,Dolomite ,0211 other engineering and technologies ,02 engineering and technology ,engineering.material ,Decomposition ,Crystallography ,chemistry.chemical_compound ,020303 mechanical engineering & transports ,0203 mechanical engineering ,Chemical engineering ,chemistry ,lcsh:TA1-2040 ,Phase (matter) ,021105 building & construction ,Urea ,engineering ,lcsh:Engineering (General). Civil engineering (General) - Abstract
Aragonite CaCO 3 with complicated morphologies needle-like structrues have been successfully synthesized through dolomite as raw materials by the decomposition of urea. The phase of the aragonite whiskers were characterized by X-ray diffraction and Fourier transform infrared, the structrue of the samples was characterized by scanning electron microscope and the effects of different ratio of materials were studied. The result show that the concentration of urea was found to have an effect on the morphology of aragonite crystals. All the prepared crystals were almost aragonite and there was no phase under varied experiment conditions. more...
- Published
- 2017
19. Morphology and luminescent properties of BaMgAl10 O17 :Eu2+ phosphor synthesized by a hydrothermal homogeneous precipitation method
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Li Chen, Qian Hong Gan, Zhan Hui Zhang, Chang Lian Chen, Qiao Tian, and Zhiliang Huang
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Homogeneous precipitation ,Materials science ,Morphology (linguistics) ,Chemical engineering ,Materials Chemistry ,Phosphor ,Surfaces and Interfaces ,Electrical and Electronic Engineering ,Condensed Matter Physics ,Luminescence ,Hydrothermal circulation ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials - Published
- 2012
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20. Preparation and budding growth of whiskers in a homogeneous system
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Zhan Hui Zhang, Zhiliang Huang, Shu Lin Wang, Chang Lian Chen, Heng Liu, and Li Chen
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Budding ,animal structures ,Materials science ,Morphology (linguistics) ,integumentary system ,Whiskers ,Diffusion ,Nucleation ,Nanotechnology ,Crystal growth ,General Chemistry ,Condensed Matter Physics ,Amorphous solid ,Chemical engineering ,Whisker ,General Materials Science - Abstract
Ca10(PO4)6(OH)2 (HAP) and NH4Al(OH)2CO3·H2O (AACHH) whiskers were prepared by a homogeneous precipitation method based on urea hydrolysis reaction. To clarify the growth process of whiskers in the homogeneous system, XRD and SEM results of the products obtained at different reaction time were investigated in detail. A novel observation about budding growth in preparing both whiskers was described. It was indicated that the growth of whiskers went through three stages, which were oversaturation, nucleation, and budding growth. The growth units of whiskers budded from the surfaces of substrates, which were crystallized flakes for HAP preparation and amorphous spherical nuclei for AACHH preparation. Subsequently, the whiskers grew up accompanying with the disappearing substrates. One-dimensional whiskers with fine morphology and large slenderness ratio were finally obtained. Besides, according to the crystal growth and the interface diffusion theories, the effects of the templates and the budding growth mechanism were discussed. more...
- Published
- 2012
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21. Phase transformation process and step growth mechanism of hydroxyapatite whiskers under constant impulsion system
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Zhiliang Huang, Changlian Chen, Han Wang, Yuehua Hu, Ru-an Chi, Jianqiu Li, Xiaokun Cheng, and Jun Yu
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Materials science ,Whiskers ,Ionic bonding ,Nanotechnology ,Condensed Matter Physics ,Surface energy ,Inorganic Chemistry ,Crystal ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Phase (matter) ,Materials Chemistry ,Growth rate ,Octacalcium phosphate ,High-resolution transmission electron microscopy - Abstract
Hydroxyapatite (HAP) whiskers were synthesized using urea as the precipitator by a phase transformation method, and their phase transformation process and growth mechanism were investigated. The results showed that with the decomposition of urea and the corresponding increase of pH value of the reaction system, dicalcium phosphate anhydrous (DCPA) and octacalcium phosphate (OCP) were precipitated at pH of 3.3–4.3; then Ca2+ and HPO 4 2 − ions began to be released from DCPA at pH values greater than 4.5. Finally HAP whiskers heterogeneously nucleated and grew up into short column crystals along the surface of the OCP flakes. In the absence of the ionic resources, DCPA gradually dissolved and the OCP flakes transformed into HAP continuously and the short columnar HAP whiskers grew up. The aspect ratio of the HAP whiskers with length of 20–100 μm and diameter of 1–2 μm was about 25. The HRTEM and AFM images showed that HAP whiskers grew along the c-axis direction, the (1 0 0) steps were clearly observed at their heads and the straight step lines instead of helical Frank ones were present on the side face of the (1 0 0) steps. The calculation on the basis of the surface energy of the HAP crystal showed that the growth rate of the (0 0 1) plane was the fastest, the growth rate at the homogeneous twist sites was the second and that at heterogeneous twist sites could be the slowest, which were the main factors finally leading to the preferential growth of HAP whiskers along the c-axis direction as well as the formation of the growth steps. more...
- Published
- 2011
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22. Pressure effecting on morphology of hydroxyapatite crystals in homogeneous system
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Xiaokun Cheng, Ru-an Chi, Changlian Chen, Wenjuan Yuan, Jianqiu Li, and Zhiliang Huang
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Materials science ,Morphology (linguistics) ,Whiskers ,General Chemistry ,Condensed Matter Physics ,Autoclave ,law.invention ,Crystal ,Crystallography ,stomatognathic system ,Chemical engineering ,law ,General Materials Science ,Growth rate ,Crystallization ,Fourier transform infrared spectroscopy ,High-resolution transmission electron microscopy - Abstract
Using Ca(NO3)2·4H2O, (NH4)2HPO4 and urea as the starting raw materials, hydroxyapatite (HAP) crystals were successfully prepared at low temperature (95 °C) by changing the starting pressure inside the autoclave. The HAP crystals were characterized by XRD, SEM, HRTEM, and FTIR technologies. The XRD patterns indicated that increasing the pressure is helpful to improve the purity of the product and the starting pressure change inside the autoclave has a great effect on the growth of HAP crystal planes. The effect of pressure on the growth of various crystal planes was certified by the analysis of HRTEM micrographs. The SEM images illustrated that HAP crystal morphology changed to long plate-like crystals, hexagonal prism-like crystals, and the crystal flakes from needle-like whiskers when increasing the starting pressure inside the autoclave to 0.5 MPa, 0.9 MPa, 1.1 MPa from 0.11 MPa. The formula (IV) about the growth rate of a-surface and c-surface was presented on the basis of the traditional formula about the growth rate of the polyhedral crystallization and the crystal and the growth unit model. According to the formula (IV), a reasonable interpretation was introduced for pressure effecting on morphologies of HAP crystal. more...
- Published
- 2011
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23. Preparation of apatite-type La9.33(SiO4)6O2 electrolyte by urea-nitrates combustion
- Author
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Jun Yu, Xiaokun Cheng, Han Wang, Changlian Chen, Zhiliang Huang, and Jianqiu Li
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Materials science ,General Chemical Engineering ,Inorganic chemistry ,Metals and Alloys ,Sintering ,Electrolyte ,Combustion ,Inorganic Chemistry ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Lanthanum oxide ,Nitric acid ,visual_art ,Materials Chemistry ,visual_art.visual_art_medium ,Relative density ,Ionic conductivity ,Ceramic - Abstract
Apatite-type La9.33(SiO4)6O2 powders have been prepared by urea-nitrates combustion at low temperature. Process parameters of combustion and characteristics of electrolyte were studied and optimized. Gelation time of precursor has been shortened distinctly by introducing an appropriate solvent system. Molar ratio of nitric acid to lanthanum oxide dependence of the nature of the phases has first been characterized. Well-crystallized La9.33(SiO4)6O2 powders with an average size of 30.5 nm were obtained at a calcining temperature as low as 800°C for 12h. Dense ceramic with a relative density of 96% was prepared by sintering the green compact of these nanopowders at 1400°C for 3 h. The sintering body exhibited a high ionic conductivity of 4.38 × 10−3 S/cm at 700°C. more...
- Published
- 2010
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24. Synthesis and characterization of BaMgAl10O17:Eu2+ phosphor prepared by homogeneous precipitation
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Jingang Feng, Zhanhui Zhang, and Zhiliang Huang
- Subjects
Materials science ,General Chemical Engineering ,Mineralogy ,Phosphor ,Ammonia volatilization from urea ,Emission intensity ,Grain size ,law.invention ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,law ,Homogeneity (physics) ,Urea ,General Materials Science ,Calcination ,Thermal stability - Abstract
A homogeneous precipitation process based on urea hydrolysis reaction was exploited to synthesize BaMgAl 10 O 17 :Eu 2+ phosphor. The process parameters, such as the dosage of urea, the calcination temperatures and the concentration of Eu 2+ , were refined in light of the characterization of the products. The experimental results revealed that pure and well-crystallized BaMgAl 10 O 17 :Eu 2+ phosphor could be obtained at 1250 °C, a much lower temperature than that for traditional solid-state reaction. The as-prepared phosphor particles were small in grain size, regular in morphology, and uniform in size distribution. Because of the high homogeneity of the process, the as-prepared phosphor exhibited stronger emission intensity and higher thermal stability than the sample prepared by solid-state reaction at 1600 °C. more...
- Published
- 2010
- Full Text
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25. Preparation of Flowerlike Porous Mg5(CO3)4(OH)2·4H2O by CO2 Bubble Templating
- Author
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Donghui Yao, Zhiliang Huang, Shijin Kong, Yu Wei, and Hong Lei
- Subjects
chemistry.chemical_classification ,Materials science ,Bubble ,Whiskers ,Halide ,02 engineering and technology ,Raw material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,chemistry.chemical_compound ,Chemical engineering ,chemistry ,Carbon dioxide ,Compounds of carbon ,0210 nano-technology ,Porosity ,Porous medium - Published
- 2018
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26. Study on Dispersion Stability of SiC Slurry and Its Membrane Properties
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Zhiliang Huang, Huang Xiaoyu, Shicong Zhou, Xin Liang, Dong Ma, and Chang-Lian Chen
- Subjects
Materials science ,technology, industry, and agriculture ,02 engineering and technology ,Polyethylene glycol ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Carboxymethyl cellulose ,Carbide ,Ammonium hydroxide ,chemistry.chemical_compound ,stomatognathic system ,chemistry ,Distilled water ,Chemical engineering ,Dispersion stability ,Slurry ,Zeta potential ,medicine ,0210 nano-technology ,medicine.drug - Abstract
Silicon carbide (SiC) slurry with a low concentration was prepared, which was milled for 3 hours by mixing SiC powder with a certain amount of polyethylene glycol (PEG), tetramethyl ammonium hydroxide (TMAH), carboxymethyl cellulose sodium (CMC-Na), distilled water, and ethonal. The influence of the pH value on the Zeta potential and the additional components on the dispersion stability of the slurry were analyzed. The influence of various factors on slurry was studied by orthogonal experiment. The results showed that solid content had the greatest influence on viscosity and stability of slurry. After the slurry was coated on the surface of porous SiC ceramics and sintered at high temperature to form a SiC membrane, the micro-structure of SiC membrane and its pore size were characterized. The result showed that the pore size distribution of SiC membrane was narrow, and the average pore diameter was about 1µm. Meanwhile, the resultant grains tend to be round, uniform, single phase. Based on the above, we could know that the slurry has a good membrane-forming properties. more...
- Published
- 2018
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27. Control of Pore Size of the Bubble-Template Porous Carbonated Hydroxyapatite Microsphere by Adjustable Pressure
- Author
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Zhiliang Huang, Qianjun He, Ru-an Chi, Jianqiu Li, and Xiaokun Cheng
- Subjects
Nanostructure ,Materials science ,Bubble ,technology, industry, and agriculture ,Nanotechnology ,General Chemistry ,Condensed Matter Physics ,Microstructure ,Template reaction ,Chemical engineering ,General Materials Science ,Porosity ,Porous medium ,Nanoscopic scale ,Microscale chemistry - Abstract
Flowerlike porous B-type carbonated hydroxyapatite (CHAp) microspheres have been synthesized by a novel bubble-template route. Their pore sizes can be well regulated in a wide range from microscale to nanoscale by smartly constructing a kind of CO2 bubble as a template and precisely adjusting the system pressure. We studied the formation of a porous structure of CHAp microspheres and the effect of the system pressure on their morphologies. Most of all, the control of the pressure over the pore sizes of bubble-template porous CHAp microspheres was investigated. The results suggested that the gathering and growth of the CO2 bubbles generated the formation of the porous structure of CHAp microspheres, and along with the increase of system pressure, the surface of the microsphere got denser and the flakes, which assembled the porous structure, became smaller. In addition, with the increased pressure, the average pore sizes of bubble-template CHAp microspheres gradually decreased from microscale to nanoscale. ... more...
- Published
- 2009
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28. Preparation of polyaniline–palladium composite microflakes by one-step interface polymerization method
- Author
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Liang Li, Xianghua Yu, Zhiliang Huang, Jiangyu Wu, Guo-Ping Yan, Qing-Zhong Guo, and Zhibin Ma
- Subjects
Materials science ,Polymers and Plastics ,Organic Chemistry ,Composite number ,chemistry.chemical_element ,chemistry.chemical_compound ,Monomer ,chemistry ,X-ray photoelectron spectroscopy ,Chemical engineering ,Polymerization ,Transmission electron microscopy ,Polyaniline ,Polymer chemistry ,Materials Chemistry ,Ethylene glycol ,Palladium - Abstract
Polyaniline–palladium (PANi-Pd) composite microflakes were synthesized through an immiscible organic/inorganic biphasic system in the presence of poly(ethylene glycol) with molecular weight 4,000 (PEG4000). Aniline was oxidized by PdCl2 in the interface polymerization system, yielding PANi microflakes and elemental Pd nanoparticles simultaneously. Palladium nanoparticles were uniformly dispersed in the microflakes of PANi. The results of FTIR spectra suggested that the oxidation degree of PANi was affected by the initial ratio of metal ions to monomer. The PANi-Pd composites were characterized using X-ray photoelectron spectroscopy and the conductivity of the composite was measured by conventional four-probe method. Scanning and transmission electron microscopy were used to show the morphology of the composites. more...
- Published
- 2008
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29. Controlled synthesis and morphological evolution of dendritic porous microspheres of calcium phosphates
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Qianjun He and Zhiliang Huang
- Subjects
Materials science ,Pore diameter ,Mechanical Engineering ,chemistry.chemical_element ,Nanotechnology ,Calcium ,Catalysis ,chemistry.chemical_compound ,Porous microspheres ,chemistry ,Chemical engineering ,Mechanics of Materials ,Specific surface area ,Glycerol ,General Materials Science ,Porosity ,Octacalcium phosphate - Abstract
Dendritic porous microspheres (DPMs) consisted of octacalcium phosphate (OCP) nucleus and carbonated hydroxyapatite (CHAp) nanoflakes have been synthesized under good control by a template-induced method in a system of constant temperature and pressure. Batch experiments were carried out to investigate the effect of the template Na2EDTA and the organic conditioner glycerol on the dendritic porous morphology. Corresponding morphological evolution process was also researched. The results revealed that the template Na2EDTA altered the natural growth habit of CHAp and induced the first dendritic growth of CHAp nanoflakes on the surface of OCP, and organic conditioner glycerol controlled the second dendritic growth of CHAp nanoflakes on the bigger ones. Higher concentrations of glycerol resulted in higher surface fractal dimension, smaller pore diameter, and greater specific surface area. more...
- Published
- 2008
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30. Thermal stability of porous A-type carbonated hydroxyapatite spheres
- Author
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Qianjun He, Zhiliang Huang, Xiao Kun Cheng, and Jun Yu
- Subjects
Materials science ,Mechanical Engineering ,Mineralogy ,Nanoparticle ,Atmospheric temperature range ,Condensed Matter Physics ,Hydrothermal circulation ,law.invention ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Mechanics of Materials ,law ,Carbonate ,General Materials Science ,Calcination ,SPHERES ,Thermal stability ,Porosity - Abstract
Porous A-type carbonated hydroxyapatite (CHAp) spheres were synthesized in the high-pressure hydrothermal system by the template-directed method. The thermal stability of porous A-type CHAp spheres was first studied via calcining in the wide temperature range from 393 K up to 1173 K, analyzed by FT-IR, XRD and SEM. The results showed that the decomposition of porous A-type CHAp spheres went through two stages, owing to the release of the carbonate from the OH − channel and the collapse of apatite-type structure above 973 K, consecutively. The nanoparticles in situ replaced the flakelets of porous CHAp spheres and packed closely into new regular porous Ca 3 (PO 4 ) 2 spheres. more...
- Published
- 2008
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31. Template-directed growth and characterization of flowerlike porous carbonated hydroxyapatite spheres
- Author
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Zhiliang Huang and Qianjun He
- Subjects
Morphology (linguistics) ,Materials science ,Mineralogy ,chemistry.chemical_element ,General Chemistry ,Condensed Matter Physics ,Micrometre ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Elemental analysis ,Urea ,Carbonate ,General Materials Science ,Porosity ,Chemical composition ,Carbon - Abstract
Flowerlike porous carbonated hydroxyapatite (CHAp) spheres were synthesized by the template-directed homogeneous precipitation method. The carbonate content of synthetic CHAp determined by carbon elemental analysis was about 1.50 wt/wt. FT-IR and XRD were employed to analyze the chemical composition of porous CHAp and SEM was used to observe crystal morphology. We studied the effect of the concentration [Ca] and [P] on ingredient and structure, the effect of urea on hierarchical structure, and the effect of the template on morphology. The results suggested that the lower concentration of [Ca] and [P] was advantageous to purity and monodispersity, that the resultant would be prone to a fancy assembly of big flakes into disks at the lower concentration of urea, and that the aperture could be regulated from micrometer size to nanometer size via altering the concentration of the template. This porous material with the hierarchical structure exhibits especial surface characteristics and has a high surface area, showing potential applications. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) more...
- Published
- 2007
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32. Controlled growth and kinetics of porous hydroxyapatite spheres by a template-directed method
- Author
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Zhiliang Huang and Qianjun He
- Subjects
Chemistry ,Kinetics ,Mineralogy ,Crystal growth ,Condensed Matter Physics ,law.invention ,Inorganic Chemistry ,Crystal ,Template reaction ,Chemical engineering ,law ,Phase (matter) ,Materials Chemistry ,Solubility ,Crystallization ,Porous medium - Abstract
Porous hydroxyapatite (HA) spheres with high purity of phase and well-controlled pore size were grown by a template-directed method. We studied for the initial concentration of Ca–P how to control the chemical component of the products, and for the concentration of template how to control the aperture and the morphology of porous HA spheres. The experimental results indicated that the lower concentration of Ca–P was prone to pure HA phase and the aperture decreased gradually with the increase of the concentration of template. Correspondingly, the crystallization thermodynamics and template-directed growth kinetics were discussed in details. The solubility isotherms of HA and dicalcium phosphate (DCPD) were calculated based on classical crystallization theories of thermodynamics. The results suggested that there was a critical concentration of P = 0.048 M in the case of Ca:P=5:3 and thus DCPD could be avoided only when P ⩽ 0.048 M in this given reaction system. Kinetic analysis of HA crystal growth revealed that the template depressed the interfacial potential energy E , then enhanced the roughness on the surface of crystal nucleus and directed HA crystal to selectively grow along the [0 0 0 1] direction, and consequently governed the aperture of porous HA spheres. The experimental results were in agreement with the theoretical analysis. more...
- Published
- 2007
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33. Temperature Effect on Hydroxyapatite Preparation by Co-precipitation Method under Carbamide Influence
- Author
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Wen-zhao Li, Jing Luo, Chang-lian Chen, Juan Chen, and Zhiliang Huang
- Subjects
Acicular ,Materials science ,Scanning electron microscope ,Coprecipitation ,Crystal ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Buffering agent ,Whisker ,Diammonium phosphate ,lcsh:TA1-2040 ,Polymer chemistry ,lcsh:Engineering (General). Civil engineering (General) ,Single crystal - Abstract
Hydroxyapatite crystal was prepared by homogeneous co-precipitation method using a mixture of Calcium nitrate and diammonium phosphate as raw materials and carbamide as the buffering agent. To analyzed the influence of temperature on hydroxyapatite crystal morphology, the phase composition, crystal morphology and growth orientation were characterized by X-ray diffraction, scanning electron microscope and infrared spectrum respectively. The results show that when the reaction temperature increase from 70 °C to 95 °C, the phases composition of crystal transform from the two phases of tricalcium phosphate and eight calcium phosphate to hydroxyapatite single crystal; the morphology of the hydroxyapatite crystals transforms from nodular whisker to perfectly and compactly acicular whisker. more...
- Published
- 2015
34. Synthesis and growth mechanism of carbonated hydroxyapatite whisker from natural collophanite via a template-directed homogeneous precipitation method
- Author
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Zhiliang Huang, Nian Sun, Jianqiu Li, He Bin Shi, Ru An Chi, and Zhan Hui Zhang
- Subjects
Precipitation (chemistry) ,Scanning electron microscope ,Chemistry ,Mechanical Engineering ,Whiskers ,Metals and Alloys ,Crystal growth ,Microstructure ,Crystallography ,Template reaction ,Chemical engineering ,Mechanics of Materials ,Whisker ,Materials Chemistry ,Template method pattern - Abstract
We reported a method to prepare carbonated hydroxyapatite (CHAP) whisker by a template-directed homogeneous precipitation process. In this process, natural collophanite was well purified and used as raw materials to promote the utilization of natural phosphorite resource. The results derived from XRD and FT-IR revealed that the as-prepared CHAP whisker had no impurities and crystallized completely. Its morphology observed by SEM and AFM showed a distinct whisker shape and a uniform distribution with the diameter in sub-micron scale and the length/diameter ratio of about 120–140, respectively. In light of the experimental results and the interface diffusion theory, a “step growth mechanism” was proposed to explain the formation of CHAP whisker in this process. more...
- Published
- 2009
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- View/download PDF
35. Poly(3,4-ethylenedioxythiophene) nanospheres synthesized in magnetic ionic liquid
- Author
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Zhibin Ma, Zhiliang Huang, Fangjun Liu, Guo-Ping Yan, Liang Li, and Yu Huang
- Subjects
Magnetic ionic liquid ,chemistry.chemical_classification ,Materials science ,Mechanical Engineering ,Polymer ,Condensed Matter Physics ,Nanomaterials ,chemistry.chemical_compound ,Monomer ,chemistry ,PEDOT:PSS ,Chemical engineering ,Mechanics of Materials ,Emulsion ,Polymer chemistry ,Ionic liquid ,General Materials Science ,Poly(3,4-ethylenedioxythiophene) - Abstract
The synthesis of poly(3,4-ethylenedioxythiophene) nanospheres with their size ranging around 60 nm has been achieved by simply adding monomers into a magnetic ionic liquid, bmim[FeCl 4 ]. The ionic liquid leads to the formation of uniform nanospheres with a relatively narrow size distribution confined to submicrometer-sized domains. The polymers produced in this magnetic ionic liquid system are compared to those synthesized in conventional solution and emulsion polymerizations. more...
- Published
- 2009
- Full Text
- View/download PDF
36. Template-directed one-step synthesis of flowerlike porous carbonated hydroxyapatite spheres
- Author
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Yu Liu, Qianjun He, Tao Xu, Wei Chen, and Zhiliang Huang
- Subjects
Diffraction ,Materials science ,Infrared ,Scanning electron microscope ,Mechanical Engineering ,Mineralogy ,One-Step ,Condensed Matter Physics ,symbols.namesake ,Fourier transform ,Chemical engineering ,Mechanics of Materials ,symbols ,General Materials Science ,SPHERES ,Granularity ,Porosity - Abstract
Flowerlike porous carbonated hydroxyapatite (CHAp) spheres were first synthesized by the template-directed self-assembly method in a high-pressure system. The product was characterized via Fourier transform infrared (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that flowerlike porous CHAp spheres were obtained, that the average granularity of porous CHAp spheres is about 20 μm, that the average aperture is about 1 μm, and that the average thickness of flakes is about 50 nm. Great amounts of OH channels, high special surface area and regular spherical shape imply potential applications. more...
- Published
- 2007
- Full Text
- View/download PDF
37. Effect of System Pressure on the Surface Microstructure of Spherical Porous Basic Magnesium Carbonate
- Author
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Weikang Peng, Hong Lei, Zhiliang Huang, and Yu Wei
- Subjects
Diffraction ,Materials science ,Magnesium ,Scanning electron microscope ,Bubble ,Mineralogy ,chemistry.chemical_element ,Raw material ,Microstructure ,chemistry.chemical_compound ,Ammonium bicarbonate ,chemistry ,Chemical engineering ,lcsh:TA1-2040 ,lcsh:Engineering (General). Civil engineering (General) ,Porosity - Abstract
spherical porous basic magnesium carbonate (Mg 5 (CO 3 ) 4 (OH) 2 .4H 2 O) has been prepared by using ammonium bicarbonate and magnesium chloride hexahydrate as raw materials. A novel CO 2 bubble template was constructed to explain the formation of pore structure of porous Mg 5 (CO 3 ) 4 (OH) 2 .4H 2 O. System pressure was found to be important in controlling the final pore size of spherical porous Mg 5 (CO 3 ) 4 (OH) 2 .4H 2 O. By the investigation of the particles from pressure-dependent experiments, scanning electron microscopy observations, X-ray diffraction, and Fourier transform infrared spectra were used to follow the reactions and identify the products. The results show that the pore size of spherical porous Mg 5 (CO 3 ) 4 (OH) 2 .4H 2 O gradually decreased via increasing system pressure. more...
- Published
- 2017
- Full Text
- View/download PDF
38. Facial synthesis of polyaniline/AgCl nanocomposites at the interface of water and ionic liquid
- Author
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Jie Pan, Songmin Shang, Xiaoming Yang, Guoping Yan, Liang Li, Zhiliang Huang, and Jingqi Shang
- Subjects
Thermogravimetric analysis ,Materials science ,Nanocomposite ,Polyaniline nanofibers ,Biomedical Engineering ,Bioengineering ,General Chemistry ,Condensed Matter Physics ,chemistry.chemical_compound ,Polymerization ,chemistry ,Chemical engineering ,Transmission electron microscopy ,Polyaniline ,Ionic liquid ,Polymer chemistry ,General Materials Science ,Fourier transform infrared spectroscopy - Abstract
Uniformly polyaniline/AgCl nanocomposites were prepared at the interface of water and ionic liquid. The morphology and structure of the nanocomposites have been studied by transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction and thermogravimetric analysis. The experimental results indicated that highly dispersed polyaniline/AgCl nanocomposites with their size of around 50-100 nm were obtained by the polymerization of aniline and the formation of AgCl at the interface simultaneously. The electroactivity of polyaniline/AgCl nanocomposites was further characterized. more...
- Published
- 2011
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