Adsorption of Wells–Dawson tungsten heteropolyacid on sol–gel alumina: Structural features and thermal stability

2005 ◽  
Vol 292 (2) ◽  
pp. 486-492 ◽  
Author(s):  
A. Tarlani ◽  
M. Abedini ◽  
M. Khabaz ◽  
M. Mohammadpour Amini
Keyword(s):  
Thermal Stability ◽  
Sol Gel ◽  
Structural Features

scholarly journals Synthesis and photocatalytic properties of Sn–TiO2 nanomaterials

2020 ◽  
Vol 10 (01n02) ◽  
pp. 2060018
Author(s):  
E. M. Bayan ◽  
T. G. Lupeiko ◽  
L. E. Pustovaya ◽  
M. G. Volkova
Keyword(s):  
Phase Transition ◽  
Thermal Stability ◽  
Sol Gel ◽  
Rutile Phase ◽  
Photocatalytic Properties ◽  
Light Activation ◽  
X Ray ◽  
Tio2 Nanomaterials ◽  
Visible Light Activation ◽  
Thermal Stability Of

Sn-doped TiO2 nanomaterials were synthesized by sol–gel method. It was shown the phase compositions and phase transitions change with the introduction of different tin amounts (0.5–20[Formula: see text]mol.%). X-ray powder diffraction was used to study the effect of different tin amounts on the anatase–rutile phase transition. It was found that the introduction of ions increases the thermal stability of anatase modifications. The material’s photocatalytic activity was studied in reaction with a model pollutant (methylene blue) photodegradation under UV and visible light activation. The best photocatalytic properties were shown for material, which contains 5[Formula: see text]mol.% of Sn.

Cobalt-Doped Silica Organic-Inorganic Materials by Sol-Gel Method: Preparation and Thermal Stability Calcined under N2 Atmosphere

2021 ◽  
Vol 219 (1) ◽  
pp. 247-259
Author(s):  
Jing Yang ◽  
Yuzhi Ai ◽  
Wangqing Fan ◽  
Ruihua Mu ◽  
Xi Chen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Sol Gel ◽  
Inorganic Materials ◽  
Gel Method ◽  
Sol Gel Method ◽  
N2 Atmosphere

Eu3+/Tb3+ Co-Doped Cerium Oxide Transparent Nanocomposite for Color-Tunable Emission

NANO ◽  
2018 ◽  
Vol 13 (10) ◽  
pp. 1850119
Author(s):  
Xiaoyan Li ◽  
Yunlong Yu ◽  
Xiangfeng Guan ◽  
Peihui Luo ◽  
Linqin Jiang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Transmission Electron Microscopy ◽  
Sol Gel ◽  
Homogeneous Precipitation ◽  
Transmission Electron ◽  
Color Tunable ◽  
Co Doped ◽  
Tunable Emission

Eu[Formula: see text]/Tb[Formula: see text] co-doped nanocomposite containing CeO2 nanocrystals was successfully prepared by an in situ sol–gel polymerization approach. High-resolution transmission electron microscopy demonstrated the homogeneous precipitation of CeO2 nanocrystals among the polymethylmethacrylate (PMMA) matrix. The thermal stability and UV-shielding capability of the obtained nanocomposite were improved with increase of CeO2 content. The tuning of the emissive color from green and yellow to red can be easily achieved by varying the dopant species and concentration. These results suggested that the obtained nanocomposite could be potentially applicable in transparent solid-state luminescent devices.

scholarly journals Sol-gel preparation and electrical behaviour of Ln: YAG (Ln = Ce, Nd, Ho, Er)

2003 ◽  
Vol 68 (8-9) ◽  
pp. 677-684 ◽  
Author(s):  
Edita Garskaite ◽  
Darizus Jasaitis ◽  
Aivaras Kareiva
Keyword(s):  
Rare Earth ◽  
Yttrium Aluminum Garnet ◽  
Sol Gel ◽  
Structural Features ◽  
Dielectric Behavior ◽  
Homogeneous Distribution ◽  
Metallic Behavior ◽  
Gel Preparation ◽  
Xrd Patterns ◽  
Increasing Temperature

A sol-gel method has been developed to prepare pure yttrium aluminum garnet Y3Al5O12 (YAG), and rare-earth substituted (Ce-Y3Al5O12, Nd-Y3Al5O12 Ho-Y3Al5O12, and Er-Y3Al5O12) samples. The XRD patterns of the polycrystalline powders sintered at 1000 ?C showed the formation of monophasic garnet materials. The micro-structural features in the polycristalline samples were studied by scanning electron microscopy. A homogeneous distribution of rare-earth do pants in the YAG lattice was achieved in all of the cases. Electrical conductivity measurements were also performed on the compacts of sol-gel derived Ln-YAG samples. In contrast to the expected dielectric behavior, the conducting properties of the examined specimens indicate metallic behavior with the resistivity increasing gradually with increasing temperature.

Thermal stability of europium(III) chelate encapsulated by sol–gel glass

2009 ◽  
Vol 480 (2) ◽  
pp. 908-911 ◽  
Author(s):  
E. Kin ◽  
T. Fukuda ◽  
S. Yamauchi ◽  
Z. Honda ◽  
H. Ohara ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Sol Gel ◽  
Thermal Stability Of

scholarly journals Highly Mixed ZrO2/SiO2 Hybrid Aerogel Deriving from Freely Tangled Weakly Branched Primary Clusters Enables Improved Thermal Stability and Excellent Thermal Insulating Performance.

2019 ◽  
Author(s):  
Benxue Liu ◽  
Min Gao
Keyword(s):  
Heat Treatment ◽  
Thermal Stability ◽  
Sol Gel ◽  
Single Component ◽  
Thermal Stabilities ◽  
Crystallization Behaviors ◽  
Thermal Insulating ◽  
Enhanced Properties ◽  
Hybrid Aerogels ◽  
Hybrid Aerogel

In compared with single component aerogel, hybrid aerogel with multi-components possessing enhanced properties, especially high thermal stabilities which are our concerns in this paper, are the promised materials in various applications. However, how the mixing between variable components within hybrid aerogel affects their properties still not very clear and needs more research efforts. In the present research, we chose a ZrO<sub>2</sub>/SiO<sub>2</sub> hybrid aerogel as represent to study their mixing and the resulted thermal stabilities. We designed a series of ZrO<sub>2</sub>/SiO<sub>2</sub> hybrid aerogels with variable ZrO<sub>2</sub>/SiO<sub>2</sub> ratio deriving from tailored sol-gel parameters, and then studied their shrinkages, nanopore collapses and crystallization behaviors upon heat-treatment.

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