Analysis of Pore Structure on Carbon Powder of Hemp Straw

2010 ◽  
Vol 177 ◽  
pp. 640-642 ◽  
Author(s):  
Ling Xuan Meng ◽  
Jian Min Gao ◽  
Tian Ma ◽  
Zi Li Yan
Keyword(s):  
Electron Microscopy ◽  
Pore Structure ◽  
Mercury Porosimetry ◽  
Nitrogen Adsorption ◽  
Size Analysis ◽  
Carbon Powder ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sic Ceramics ◽  
Transmission Electron

Reaction-formed silicon carbide (RF-SiC) ceramics can be prepared by melt Si-infiltration of the carbon preform which fabricated by casting of carbon powder of hemp straw. In order to make clear the pore structure of the carbon powder of hemp straw which affect the mechanical property of RF-SiC ceramics, the morphology and inherent pore structure of carbon powder of hemp straw were characterized with powder X-ray diffraction, laser diffraction size analysis, scanning electron microscopy, transmission electron microscopy, mercury porosimetry and nitrogen adsorption. The results indicated that some parts of interconnected macroporous and mesoporous structures of hemp straw still remained after carbonization and the RF-SiC ceramics with outstanding performance can be fabricated with this carbon powder by melt Si-infiltration of the porous preform

The Evaporative Decomposition of Solutions Method (Eds) for the Production of Ultrafine Y1Ba2Cu3O7 from Nitrate and Mixed Anion Precursor Solutions

1989 ◽  
Vol 169 ◽  
Author(s):  
Rollin E. Lakis ◽  
Sidney R. Butler
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Barium Carbonate ◽  
Hollow Spheres ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

AbstractY1Ba2Cu3O7 has been prepared by the evaporative decomposition of solutions method. Nitrate and mixed anion solutions were atomized and decomposed at temperatures ranging from 300°C to 950°C. The resulting materials have been characterized using x-ray powder diffraction, Thermal Gravimetric Analysis (TGA), particle size analysis, Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM). The powder consists of 0.3 micron agglomerated hollow spheres with a primary particle size of 0.06 micron. TGA and x-ray diffraction indicate the presence of barium nitrate and barium carbonate due to incomplete decomposition and/or product contamination by the process environment.

SYNTHESIS, CHARACTERIZATION AND THE APPLICABILITY OF β-CYCLODEXTRINS FUNCTIONALIZED MESOPOROUS SBA-15 MOLECULAR SIEVES

NANO ◽  
2013 ◽  
Vol 08 (05) ◽  
pp. 1350050
Author(s):  
MIN GUAN ◽  
HAI-PENG BI ◽  
ZUYUAN WANG ◽  
SHAOHUA BU ◽  
LING HUANG ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Molecular Sieves ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
X Ray ◽  
Adsorption Capacities ◽  
Transmission Electron ◽  
Potential Applications ◽  
Adsorption Desorption

Mesoporous silicas SBA-15 are modified with β-Cyclodextrins (β-CD) by simple grafting method. β-CD functionalized SBA-15 was characterized by Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM), powder X-ray diffraction (PXRD), nitrogen adsorption–desorption measurements, thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS). Furthermore, the applicability of it is investigated through studying the adsorption properties of clenbuterol. It showed better adsorption capacities of clenbuterol than pure SBA-15. β-CD functionalized SBA-15 material has the potential applications in the treatment of clenbuterol contamination in food and environment science.

Preparation of TiO2/Ga2O3 Nanowires by a Sol-Gel-Solvothermal Method

2010 ◽  
Vol 663-665 ◽  
pp. 965-968
Author(s):  
Yue Hui Wang ◽  
Dong Jun Wang ◽  
Ai Jun Song ◽  
Zhi Gang Zhang ◽  
Shi Tao Song
Keyword(s):  
Electron Microscopy ◽  
Near Infrared ◽  
Solvothermal Method ◽  
Sol Gel ◽  
Nitrogen Adsorption ◽  
Tetrabutyl Titanate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
First Time

TiO2/Ga2O3 nanowires were successfully prepared by a sol–gel-solvothermal method using tetrabutyl titanate as precursor, alcohol as solvent, Ga2O3 as templet and dopants, alginate as dispersant. The structures, morphologies,compositions and catalytic activity of products have been characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy ( FESEM ), nitrogen adsorption test, ultraviolet-visible near-infrared spectroscopy (UV–vis–NIR ),energy dispersive X-ray (EDX) analysis and spectrophotometer. The results revealed that the as-synthesized TiO2/Ga2O3 nanowires grew along [001] direction,which is reported for the first time, and the as-prepared product had better optical activity than TiO2 nanoparticles. Finally, the nanowires have a good adsorption capacity of 128.2 m2/g tested through nitrogen adsorption.

Textural features of highly ordered Al-MCM-41 molecular sieve studied by X-ray diffraction, nitrogen adsorption and transmission electron microscopy

2006 ◽  
Vol 60 (21-22) ◽  
pp. 2682-2685 ◽  
Author(s):  
Marcelo J.B. Souza ◽  
Antonio S. Araujo ◽  
Anne M.G. Pedrosa ◽  
Bojan A. Marinkovic ◽  
Paula M. Jardim ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Molecular Sieve ◽  
Nitrogen Adsorption ◽  
Textural Features ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Mcm 41

Synthesis and Characterization of Mesoporous Carbon with MoO3 Loading via Ultrasonic Assembly

2010 ◽  
Vol 654-656 ◽  
pp. 2277-2280
Author(s):  
Xi Long ◽  
Wen Chen ◽  
Shao Jiang Chen ◽  
Chun Xia Zhao
Keyword(s):  
Electron Microscopy ◽  
Mesoporous Carbon ◽  
Nitrogen Adsorption ◽  
Photoelectron Spectra ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Sol Precursor

Mesoporous carbon with MoO3 loading (MoO3/CMK-3) was obtained via ultrasonic assembly with CMK-3 as the host material and MoO3 as the guest material which was yield from MoO3ּpH2O2ּqH2O sol precursor. The microstructures of such MoO3/CMK-3 composites were characterized by X-ray diffraction (XRD), nitrogen adsorption and desorption, X-ray photoelectron spectra (XPS), Fourier-transform infrared (FTIR) and transmission electron microscopy (TEM). The results show that the method of ultrasonic assembly was efficient to highly disperse MoO3 nanoparticales into the channels of mesoporous carbon.

Characterization and Photocatalytic Activity of La1.6Ln0.4Zr2O7 (Ln= La, Nd, Dy, Er) Nanocrystals by Stearic Acid Method

2010 ◽  
Vol 123-125 ◽  
pp. 631-634 ◽  
Author(s):  
Yu Ping Tong ◽  
Shun Bo Zhao ◽  
Feng Lan Li ◽  
Chang Yong Li
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Photocatalytic Activity ◽  
Stearic Acid ◽  
Nitrogen Adsorption ◽  
Combustion Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Degradation Of Methyl Orange

La1.6Ln0.4Zr2O7 (Ln= La, Nd, Dy, Er) nanocrystals were prepared by stearic acid combustion method. The samples were characterized by powder X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) nitrogen adsorption, transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The photocatalytic activity of La1.6Ln0.4Zr2O7 was evaluated by the photocatalytic degradation of methyl orange. The order of the photocatalytic activity was as following: La1.6Er0.4Zr2O7>La1.6Dy0.4Zr2O7> La1.6Nd0.4Zr2O7> La2Zr2O7. La1.6Dy0.4Zr2O7 showed that the best photocatalytic activity and the reason may be related to the big magnetic moment of Er3+. It may be considered largely to be caused by the partly occupied Ln4f levels. Since the solid samples have the same structure, the reason that La1.6Er0.4Zr2O7 shows the highest reactivity may be related to lowest Ln4f level of Er3+.

Size-Controllable Synthesis of Worm-Like SiO2 Microspheres Using Dodecylamine as Direct Agent in Ethanol/Water Solvent System

2013 ◽  
Vol 448-453 ◽  
pp. 154-159
Author(s):  
Xue Ling Zhang ◽  
Wei Yao Zhu ◽  
Meng Jing Cao ◽  
Qiang Cai ◽  
Xiao Feng Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Nitrogen Adsorption ◽  
Solvent System ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Controllable Synthesis ◽  
Silica Microspheres ◽  
X Ray ◽  
Water Solvent ◽  
Transmission Electron

Size-controllable synthesis of worm-like microporous monodispersed SiO2microspheres using dodecylamine (DDA) as direct agent in ethanol-water solvent system was firstly developed by varying the proportion of reactants. The products were characterized with scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), small angle X-ray diffraction (SAXRD) and nitrogen adsorption. The results showed that the SiO2microspheres with size of 50nm~1um could be prepared by varying the molar ratio of water/ethanol when the molar ratio of (DDA)/tetraethyl orthosilicate (TEOS) is 0.4 and the concentration of TEOS varied from 0.138 to 0.248mol/L. This method is simple and convenient, the prepared SiO2microspheres are monodispersed and uniform, the worm-like pore size is about 1.4nm. The size controllable silica microspheres could be used as an excellent additional medium to alter rheological behavior of fluid after surface modification..

scholarly journals Synthesis of Thermally Spherical CuO Nanoparticles

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Nittaya Tamaekong ◽  
Chaikarn Liewhiran ◽  
Sukon Phanichphant
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Nitrogen Adsorption ◽  
Average Diameter ◽  
Cuo Nanoparticles ◽  
Thermal Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Copper oxide (CuO) nanoparticles were successfully synthesized by a thermal method. The CuO nanoparticles were further characterized by thermogravimetric analysis (TGA), differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), and high resolution transmission electron microscopy (HRTEM), respectively. The specific surface area (SSABET) of CuO nanoparticles was determined by nitrogen adsorption. TheSSABETwas found to be 99.67 m2/g (dBETof 9.5 nm). The average diameter of the spherical CuO nanoparticles was approximately 6–9 nm.

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