Effect of organic gelator template and preparation method on the structure and morphology of nanosized polymorphic titanium oxide using the sol–gel process

2011 ◽  
Vol 38 (3-5) ◽  
pp. 685-692
Author(s):  
Tae Kyu Kim ◽  
Euh Duck Jeong ◽  
Mee Sung Lee ◽  
Jong-Pil Kim ◽  
Myung Ho Hyun ◽  
...  
Keyword(s):  
Titanium Oxide ◽  
Preparation Method ◽  
Sol Gel ◽  
Structure And Morphology ◽  
Sol Gel Process

Preparation of Titanium Oxide and Metal Titanates as Powders, Thin Films, and Microspheres by Novel Inorganic Sol-Gel Process

2005 ◽  
Vol 900 ◽  
Author(s):  
A. Deptuła ◽  
Kenneth C Goretta ◽  
Tadeusz Olczak ◽  
Wieslawa Lada ◽  
Andrzej G. Chmielewski ◽  
...  
Keyword(s):  
Thin Films ◽  
Ascorbic Acid ◽  
Nitric Acid ◽  
Titanium Oxide ◽  
Sol Gel ◽  
Solid State Reactions ◽  
X Ray Diffraction ◽  
Metal Hydroxides ◽  
X Ray ◽  
Sol Gel Process

ABSTRACTTitanium oxide and titanates based on Ba, Sr and Ca were prepared from commercial solutions of TiCl4 and HNO3. The main preparation steps for the sols consisted of elimination of chloride anions by distillation with nitric acid and addition of metal hydroxides for the titanates. Resulting sols were gelled and used to (1) prepare irregularly shaped powders by evaporation; (2) produce by a dipping technique thin films on glass, Ag, or Ti substrates; and (3) produce spherical powders (diameters <100 μm) by solvent extraction. Results of thermal and X-ray-diffraction analyses indicated that the temperatures required to form the various compounds were lower than those necessary to form the compounds by conventional solid-state reactions and comparable to those required with use of organometallic based sol-gel methods. Temperatures of formation could be further reduced by addition of ascorbic acid to the sols.

Photoluminescent, self-cleaning titanium oxide nanocomposites with multifunctional properties

RSC Advances ◽  
2014 ◽  
Vol 4 (106) ◽  
pp. 61727-61735 ◽  
Author(s):  
Venu Sreekala Smitha ◽  
Saju Pillai ◽  
Unnikrishnan Nair Saraswathy Hareesh ◽  
Balagopal N. Nair ◽  
Krishna Gopakumar Warrier
Keyword(s):  
Titanium Oxide ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Self Cleaning ◽  
Multifunctional Properties

Novel multifunctional luminescent and self-cleaning nanocomposites and coatings of Eu doped TiO2–SiO2–LaPO4 (Eu-TSL) were synthesized from an aqueous sol–gel process which possess photoactivity, low wettability and photoluminescent properties.

Morphology-Controlled Synthesis of Nanostructured Silicon Carbide

2004 ◽  
Vol 815 ◽  
Author(s):  
Xiang-Yun Guo ◽  
Guo-Qiang Jin ◽  
Ya-Juan Hao
Keyword(s):  
Silicon Carbide ◽  
Chemical Composition ◽  
Carbothermal Reduction ◽  
Phenolic Resin ◽  
Preparation Method ◽  
Sol Gel ◽  
Controlled Synthesis ◽  
Nanostructured Silicon ◽  
Sol Gel Process

AbstractPhenolic resin and tetraethoxysilane were used to prepare a binary carbonaceous silicon xerogel, the precursor of silicon carbide (SiC). By employing different additives in the sol-gel process, a series of xerogel precursors with differently chemical composition were obtained. Heating these xerogels to 1250°C, nanostructured β-SiC with various morphologies including nanowires, nanofibers, nanoparticles and mesoporous SiC were produced via carbothermal reduction. The preparation method of the xerogels was presented and the influences of different additives on the sol-gel process and the SiC formation were discussed in this paper.

Effect of Catalyst Used in the Sol-Gel Process on the Microstructure and Adsorption/Desorption Performance of Silica Aerogels

2013 ◽  
Author(s):  
Kashif Nawaz ◽  
Shelly J. Schmidt ◽  
Anthony M. Jacobi
Keyword(s):  
Preparation Method ◽  
Sol Gel ◽  
Moisture Diffusivity ◽  
Silica Aerogels ◽  
Performance Parameters ◽  
Vapor Sorption ◽  
Dynamic Vapor Sorption ◽  
Sol Gel Process ◽  
Air Conditioning Systems ◽  
Adsorption Desorption

Silica aerogels are often deployed as solid desiccants in enthalpy wheels used for dehumidifying ventilation air in air-conditioning systems. These materials have good adsorption and desorption characteristics, but microstructure affects their moisture diffusivity. As the performance of desiccant systems depends on diffusivity, it is important to select a preparation method providing the desired aerogel microstructure for enhanced dehumidification performance. A study is described in which the structure of silica aerogels prepared by the Sol-Gel process is analyzed. The same precipitator (TMOS-Tetra methyl orthosilicate) and solvent (Methanol) are used to prepare all samples. It is found that density and microstructure are highly dependent on the catalyst used in the Sol-Gel process. Dynamic vapor sorption experiments are conducted to determine diffusivity. Microscopic images are analyzed to discern the structure and to relate it to corresponding adsorption or desorption performance parameters.

Microporous Structure of Titanium Oxide Prepared by a Salt Catalytic Sol–Gel Process

2001 ◽  
Vol 30 (12) ◽  
pp. 1280-1281 ◽  
Author(s):  
Kazuhiko Tanaka ◽  
Yasushi Murakami ◽  
Tomohito Imai ◽  
Taki Matsumoto ◽  
Shinsuke Furuno ◽  
...  
Keyword(s):  
Titanium Oxide ◽  
Sol Gel ◽  
Microporous Structure ◽  
Sol Gel Process
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