Boehmite and Yttrium Oxide Coatings on Silicon Nitride From Aqueous Sols

1996 ◽  
Vol 432 ◽  
Author(s):  
Michael Buchta ◽  
Wei-Heng Shih
Keyword(s):  
Silicon Nitride ◽  
Aqueous Solutions ◽  
Hydrothermal Treatment ◽  
Yttrium Oxide ◽  
Sol Gel ◽  
Yttrium Nitrate ◽  
Oxide Coatings ◽  
Gel Method ◽  
Sol Gel Method

AbstractTo improve the processing of silicon nitride, boehmite and yttrium oxide were coated on silicon nitride particles by an aqueous sol-gel method. It is shown that boehmite and Y2O3 can be coated on Si3N4 particles from aqueous solutions. However, the Y2O3 coating is not as complete as boehmite coating. The coating of a yttria coating followed by a boehmite coating was attempted and the TEM showed a coating twice as thick as the Y2O3 or AlOOH coating. Hydrothermal treatment of yttrium nitrate hydrous hydroxide results in the formation and growth of Y(OH)3 fibers which can be calcined and transformed into Y2O3 fibers at 500°C.

scholarly journals Green sol–gel route for selective growth of 1D rutile N–TiO2: a highly active photocatalyst for H2 generation and environmental remediation under natural sunlight

RSC Advances ◽  
2017 ◽  
Vol 7 (52) ◽  
pp. 33029-33042 ◽  
Author(s):  
Supriya K. Khore ◽  
Navya Vani Tellabati ◽  
Sanjay K. Apte ◽  
Sonali D. Naik ◽  
Prashant Ojha ◽  
...  
Keyword(s):  
Hydrothermal Treatment ◽  
Environmental Remediation ◽  
Sol Gel ◽  
Selective Growth ◽  
Gel Method ◽  
Natural Sunlight ◽  
Sol Gel Method ◽  
H2 Generation ◽  
Highly Active

We report selective growth of N–TiO2 1D nanorods using a green aqueous sol–gel method followed by hydrothermal treatment.

Comparison of the morphology and structure of WO3 nanomaterials synthesized by a sol-gel method followed by calcination or hydrothermal treatment

2012 ◽  
Vol 6 (4) ◽  
pp. 371-380 ◽  
Author(s):  
Diah Susanti ◽  
N. Stefanus Haryo ◽  
Hasnan Nisfu ◽  
Eko Prasetio Nugroho ◽  
Hariyati Purwaningsih ◽  
...  
Keyword(s):  
Hydrothermal Treatment ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Morphology And Structure

Fe3+-TiO2 photocatalysts prepared by combining sol–gel method with hydrothermal treatment and their characterization

2006 ◽  
Vol 180 (1-2) ◽  
pp. 196-204 ◽  
Author(s):  
Jiefang Zhu ◽  
Feng Chen ◽  
Jinlong Zhang ◽  
Haijun Chen ◽  
Masakazu Anpo
Keyword(s):  
Hydrothermal Treatment ◽  
Sol Gel ◽  
Tio2 Photocatalysts ◽  
Gel Method ◽  
Sol Gel Method

Effect of hydrothermal treatment on structural and photocatalytic properties of TiO2 synthesized by sol–gel method

2012 ◽  
Vol 411-412 ◽  
pp. 153-159 ◽  
Author(s):  
E. Pulido Melián ◽  
O. González Díaz ◽  
J.M. Doña Rodríguez ◽  
G. Colón ◽  
J.A. Navío ◽  
...  
Keyword(s):  
Hydrothermal Treatment ◽  
Sol Gel ◽  
Photocatalytic Properties ◽  
Gel Method ◽  
Sol Gel Method

Synthesizing Silicon Nitride Whiskers by Solvothermal and Carbothermal Methods

2008 ◽  
Vol 368-372 ◽  
pp. 868-870
Author(s):  
Guo Qiang Tan ◽  
Hong Yan Miao ◽  
Hui Jun Ren ◽  
Zhi Wei Yu ◽  
Jia Li ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Ethyl Ester ◽  
Solvothermal Method ◽  
Raw Materials ◽  
Sol Gel ◽  
Heat Treating ◽  
Gel Method ◽  
Sol Gel Method ◽  
Precursor Powders ◽  
Amorphous Si3n4

Xerogel was prepared by the sol-gel method using ethyl ester orthosilicate, alcohol, carbamide and glucose with various contents as raw materials. The precursor powders were obtained after xerogel was solvothermally treated at 220oC for 2.5 h. IR analyses showed that the Si-O-Si and Si-O-NH2 bond are obtained in the precursors. XRD analyses indicated that the powders prepared by the solvothermal method are amorphous. Si3N4 powders are produced by heat-treating the precursors at 1400 oC in N2. It was proved that the synthesized powders are α–Si3N4 whiskers. With the increase of the glucose contents and the heat-treating temperature, the crystallization of Si3N4 is obviously improved.

Protective properties of composite oxide coatings deposited by sol-gel method

2011 ◽  
Vol 50 (5-6) ◽  
pp. 295-300 ◽  
Author(s):  
S. Miszczak ◽  
B. Pietrzyk ◽  
Z. Gawronski
Keyword(s):  
Sol Gel ◽  
Oxide Coatings ◽  
Composite Oxide ◽  
Protective Properties ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals Synthesis of TiO2 via modified sol-gel method and its use in carbonized medium-density fiberboard for toluene decomposition

BioResources ◽  
2019 ◽  
Vol 14 (3) ◽  
pp. 6516-6528
Author(s):  
Min Lee ◽  
Sang-Bum Park ◽  
Sung-Phil Mun
Keyword(s):  
Hydrothermal Treatment ◽  
Medium Density Fiberboard ◽  
Sol Gel ◽  
Analysis Data ◽  
Treatment Temperature ◽  
Medium Density ◽  
Gel Method ◽  
Sol Gel Method ◽  
Solution Type ◽  
Aqueous Conditions

A solution-type TiO2-based photocatalyst for the decomposition of volatile organic compounds was synthesized using a modified sol-gel method under either alcohol (ethanol or isopropanol) or aqueous conditions. Anatase-type TiO2 was successfully synthesized with additional hydrothermal treatment using either type of medium. However, the aqueous condition for TiO2 synthesis was more convenient for the formation of anatase-type TiO2. Based on X-ray diffraction analysis data, the optimal hydrothermal treatment temperature was 80 °C for anatase-type TiO2 formation; at temperatures below 80 °C or above 90 °C, mostly rutile-type TiO2 was formed. The synthesized anatase-type TiO2 solution was applied to the surface of carbonized medium-density fiberboard (c-MDF). The anatase-type TiO2 on c-MDF showed good maintenance of toluene decomposition performance even after repeated use for 14 weeks.

scholarly journals Study of the Bandgap of Synthesized Titanium Dioxide Nanoparticules Using the Sol-Gel Method and a Hydrothermal Treatment

2009 ◽  
Vol 4 (1) ◽  
pp. 9-14 ◽  
Author(s):  
Sergio Valencia ◽  
Juan Miguel Marín ◽  
Gloria Restrepo
Keyword(s):  
Titanium Dioxide ◽  
Hydrothermal Treatment ◽  
Diffuse Reflectance Spectroscopy ◽  
Titanium Dioxide Nanoparticles ◽  
Anatase Phase ◽  
Sol Gel ◽  
Molar Ratio ◽  
Bandgap Energy ◽  
Gel Method ◽  
Sol Gel Method

In this work optical properties of titanium dioxide nanoparticles were studied. Titanium dioxide nanoparticles were synthesized by the sol-gel method followed by a hydrothermal treatment using tetraisopropyl orthotitanate (TIOT) and 2-propanol. The synthesized samples were characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (UV/DRS) and nitrogen adsorption-desorption methods. The bandgap energy was obtained using the Kubelka-Munk reemission function. The catalyst synthesized with a molar ratio of R1 (water/TIOT) = 3.5 and R2 (2-propanol/TIOT) = 15 has a predominately anatase phase. It also has a high photo degradation of methyl orange compared to TiO2 Degussa P-25. A shift band gap energy of 3.27 was observed

Sign in / Sign up

Export Citation Format

Share Document