Preparation and Morphology of Mullite Whiskers by Sol-Gel Method

2007 ◽  
Vol 336-338 ◽  
pp. 1313-1315 ◽  
Author(s):  
Zhou Fu Wang ◽  
Chun Tian Du ◽  
Xi Tang Wang ◽  
Bao Guo Zhang
Keyword(s):  
Thermal Analysis ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Mullite Whiskers

Mullite whiskers were prepared by sol-gel method. The preparing conditions, the morphology and crystallite phase of the mullite whiskers were studied by Thermal analysis, XRD and SEM. The results demonstrate that the uniform mullite whiskers with high aspect ratio were obtained in properly preparing conditions and appropriate amount of fluorides.

Preparation and Morphology of Mullite Whiskers by Sol-Gel Method

2007 ◽  
pp. 1313-1315
Author(s):  
Zhou Fu Wang ◽  
Chun Tian Du ◽  
Xi Tang Wang ◽  
Bao Guo Zhang
Keyword(s):  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Mullite Whiskers

Kramers–Kronig method for determination of optical properties of PZT nanotubes fabricated by sol–gel method and porous anodic alumina with high aspect ratio

2018 ◽  
Vol 32 (08) ◽  
pp. 1850096 ◽  
Author(s):  
Esmaeil Pakizeh ◽  
Mahmood Moradi
Keyword(s):  
Aspect Ratio ◽  
Optical Constants ◽  
Sol Gel ◽  
Transformation Method ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Sem Images ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ft Ir

Ferroelectric Pb(ZrTi)O3 (PZT) nanotubes were prepared by sol–gel method and porous anodic alumina (PAA) membrane using spin-coating technique. This method is based on filling-pyrolysis-filling process and the use of one-stage alumina membranes. One of the advantages of this method is its rapidity, which takes only 1 h time before the calcination step. The effect of repeated pores filling was investigated to get the required size of nanotubes. The field emission scanning electron microscope (FE-SEM) images were shown that the PZT nanotubes have inner diameters in the range of 65–90 nm and length of about 50–60 [Formula: see text]m. This means that the samples have a significant aspect ratio (700–800). Also the FE-SEM image confirmed that the highly ordered, hexagonally distributed PAA membranes with the pore diameter about 140–150 nm were formed. The X-ray diffraction (XRD) results showed that the PZT nanotubes have a tetragonal structure. The metal oxide bands like ZrO6 and TiO6 of the final PZT nanotubes were detected by Fourier transform infrared (FT-IR) analysis and confirmed the formation of perovskite structure. By using FT-IR spectroscopy and Kramers–Kronig transformation method, the optical constants like real [Formula: see text]([Formula: see text]) and imaginary [Formula: see text]([Formula: see text]) parts of dielectric function, extinction coefficient k([Formula: see text]) and refractive index n([Formula: see text]) were determined. It was shown that the optical constants of PZT nanotubes are different from PZT nanoparticles.

The Preparation of BaTi4O9 by Sol-Gel Method

2016 ◽  
Vol 852 ◽  
pp. 272-277 ◽  
Author(s):  
Zhao Rong Wei ◽  
Chao Yang Shi ◽  
Bin Shen ◽  
Ming Fan ◽  
Cheng Wang
Keyword(s):  
Thermal Analysis ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Tem Analysis ◽  
Gel Method ◽  
Sol Gel Method ◽  
Different Temperatures

To promote the application of BaTi4O9 in higher-end fields, BaTi4O9 precursor has been prepared with sol-gel method (SGM. The objective products have been obtained at different temperatures and SSR-BaTi4O9 samples has been prepared for compare experiments. The studies of thermal analysis, XRD analysis, TEM analysis, specific surface area analysis, DRS analysis and FS analysis show: the crystalline of the product obtained by SGM is more purity than the product obtained by SSR; The SGM600 sample is amorphous, which can be used as an optical catalyst because of the maximum specific surface area; The SGM1000 sample is the most pure, uniform and complete in crystal.

scholarly journals Investigation with using thermal analysis of gas evolution and sintering of nanopowders of zirconia prepared by sol-gel method

2020 ◽  
Vol 97 (1) ◽  
pp. 88-96
Author(s):  
E. Sheveleva ◽  
◽  
S. Shevelev ◽  
A. Sokolovskiy ◽  
A.K. Zeinidenov ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Gas Evolution ◽  
Densification Behavior ◽  
Stabilized Zirconia ◽  
Gel Method ◽  
Sol Gel Method ◽  
Powder Compacts ◽  
Zirconia Powders

Thermal and XRD analyses were used to study partially stabilized zirconia powders produced by sol-gel method in order to investigate gas evolution in annealing in air and densification behavior of these powders in compaction and subsequent sintering. It was found that the powders of the initial gel contain a large amount of gas adsorbates. The amount of adsorbates decreases as the annealing temperature grows. At annealing temperature of 700 ºC, adsorbates are completely removed from the powders and the latter obtain a crystalline structure with a predominant tetragonal phase. Gas adsorbates affect densification of powder compacts during sintering and facilitate the production of ceramics with a porosity of not more than 5 %. It is shown that the production of low porosity ceramics is complicated even though powders subjected to annealing may contain nano-sized impurities or be free of these. Low-melting additives are proposed to be used for ceramics production.

Spectroscopic, Thermal Analysis and Bioactivity Study of New Ferrous Citrate Based Materials Prepared by Sol–Gel Method

2020 ◽  
Vol 389 (1) ◽  
pp. 1900084
Author(s):  
Stefano Vecchio Ciprioti ◽  
Daniele Naviglio ◽  
Monica Gallo ◽  
Federico Barrino ◽  
Michelina Catauro
Keyword(s):  
Thermal Analysis ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ferrous Citrate
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