Sol-gel Synthesis of Porous Crystalline TiO2–P2O5 Oxide with Thermal Stability

2003 ◽  
Vol 18 (12) ◽  
pp. 2743-2746 ◽  
Author(s):  
Donglin Li ◽  
Haoshen Zhou ◽  
Mitsuhiro Hibino ◽  
Itaru Honma
Keyword(s):  
Heat Treatment ◽  
Thermal Stability ◽  
Solid State ◽  
Block Copolymer ◽  
Specific Surface ◽  
Mixed Oxide ◽  
Glass Phase ◽  
Sol Gel ◽  
Anatase Structure ◽  
Sol Gel Synthesis

Porous TiO2–P2O5 oxide was synthesized by the sol-gel method in the presence of tri-block copolymer (EO)20(PO)70(EO)20 (Pluronic123) in queous solution. The TiO2 nanocrystals with anatase structure precipitated in the as-synthesized TiO2–P2O5 materials at 80°C, considerably lower than that for traditional heat treatment in the solid state, which maintained a stable size of 3.6–4 nm upon calcinations below 500°C. It is believed that P2O5 glass phase prevents the coarsening of TiO2 nanocrystals below 500°C. The mixed oxide exhibited a specific surface area of 170–200 m2/g after calcining in the temperature range of 300–500°C.

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.

Sol-gel synthesis, solid sintering, and thermal stability of single-phase YCoO3

2012 ◽  
Vol 209 (7) ◽  
pp. 1219-1224 ◽  
Author(s):  
Guanlin Feng ◽  
Yanfeng Xue ◽  
Hongzhi Shen ◽  
Shuo Feng ◽  
Liang Li ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Single Phase ◽  
Sol Gel ◽  
Sol Gel Synthesis ◽  
Thermal Stability Of

Sol–gel synthesis of alumina modified by phosphorus: a solid state NMR characterization study

1999 ◽  
Vol 9 (10) ◽  
pp. 2637-2646 ◽  
Author(s):  
Juliette Quartararo ◽  
Michel Guelton ◽  
Monique Rigole ◽  
Jean‐Paul Amoureux ◽  
Christian Fernandez ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Sol Gel ◽  
Characterization Study ◽  
Nmr Characterization ◽  
Sol Gel Synthesis

Sol-Gel Synthesis of thin Films for use as Planar Waveguides

1990 ◽  
Vol 180 ◽  
Author(s):  
G.W. Dale ◽  
H.H. Fox ◽  
Brian J.J. Zelinski ◽  
Laura Weller-Brophy
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Sol Gel ◽  
Planar Waveguides ◽  
Antireflective Coatings ◽  
Synthesis Techniques ◽  
Prism Coupler ◽  
University Of Arizona ◽  
The University ◽  
Sol Gel Synthesis

SiO2-TiO2 sol-gel solutions and synthesis techniques have been developed to produce thin films of proper index, thickness and quality for use as planar waveguides. The composition of the synthesized films ranged from 50 to 68 mole % TiO2 and produced layers with indices ranging from 1.7 to 1.8. Final film thicknesses ranged from 1000 to 3000 A and varied as a function of the coating chemistry and conditions. Also, changes in film shrinkage and index with heat treatment were determined and compared to literature data on similar films used as antireflective coatings. Finally, confirmation of the waveguiding qualities of these films was made through prism coupler measurements conducted by the University of Arizona Optical Sciences Center.

Enhanced photoactivity and anatase thermal stability of silica–alumina mixed oxide additives on sol–gel nanocrystalline titania

2007 ◽  
Vol 61 (8-9) ◽  
pp. 1751-1755 ◽  
Author(s):  
K.V. Baiju ◽  
P. Periyat ◽  
P. Krishna Pillai ◽  
P. Mukundan ◽  
K.G.K. Warrier ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Mixed Oxide ◽  
Sol Gel ◽  
Nanocrystalline Titania ◽  
Silica Alumina ◽  
Thermal Stability Of

Sol–gel synthesis and structural characterization of niobium-silicon mixed-oxide nanocomposites

2007 ◽  
Vol 43 (2) ◽  
pp. 193-204 ◽  
Author(s):  
Antonio Aronne ◽  
Elisa Marenna ◽  
Valeria Califano ◽  
Esther Fanelli ◽  
Pasquale Pernice ◽  
...  
Keyword(s):  
Structural Characterization ◽  
Mixed Oxide ◽  
Sol Gel ◽  
Sol Gel Synthesis

scholarly journals A versatile sol–gel synthesis route to metal–silicon mixed oxide nanocomposites that contain metal oxides as the major phase

2004 ◽  
Vol 350 ◽  
pp. 173-181 ◽  
Author(s):  
Brady J. Clapsaddle ◽  
David W. Sprehn ◽  
Alexander E. Gash ◽  
Joe H. Satcher Jr. ◽  
Randall L. Simpson
Keyword(s):  
Metal Oxides ◽  
Mixed Oxide ◽  
Sol Gel ◽  
Major Phase ◽  
Synthesis Route ◽  
Sol Gel Synthesis
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