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Wet-chemistry processing of powdery raw material for high-tech ceramics.

Trusova EA, Vokhmintcev KV, Zagainov IV - Nanoscale Res Lett (2012)

Bottom Line: The purpose of this study was to develop wet-chemistry approaches for the synthesis of ultradispersed and mesoporous metal oxide powders and powdery composites intended for usage in the production of ceramic materials with desired properties.It was found that morphological parameters of the metal oxide obtained by the modified sol-gel technique depend nonlinearly on the initial molar ratio value of the sol stabilizer and metal in the reaction medium as well as the nature of the stabilizer.The developed laboratory technology corresponds to the conception of soft chemistry and may be adapted to the manufacture of ultradispersed materials for catalysis, solar cells, fuel cells, semiconductors, sensors, low-sized electronic devices of new generation, etc.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratory of Functional Ceramics, A,A, Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninsky pr, 49, Moscow, 119991, Russia. vokirill@gmail.com.

ABSTRACT
The purpose of this study was to develop wet-chemistry approaches for the synthesis of ultradispersed and mesoporous metal oxide powders and powdery composites intended for usage in the production of ceramic materials with desired properties. The focus is on the development of template synthesis of mesoporous metal silicates as well as obtaining nano- and subnanopowders by a modified sol-gel technique and template methods. Families of mesoporous (2 to 300 nm) metal silicates and nano-oxides and subnanopowders (4 to 300 nm) were synthesized by the template method and modified sol-gel technique, respectively. Texture and morphology of the obtained objects have been studied by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller analysis, and N2 adsorption-desorption. It was found that morphological parameters of the metal oxide obtained by the modified sol-gel technique depend nonlinearly on the initial molar ratio value of the sol stabilizer and metal in the reaction medium as well as the nature of the stabilizer. It has been shown that the nature of structure-directing components determines the morphology of the silicate obtained by the template method: dispersion and shape of its particles. The developed laboratory technology corresponds to the conception of soft chemistry and may be adapted to the manufacture of ultradispersed materials for catalysis, solar cells, fuel cells, semiconductors, sensors, low-sized electronic devices of new generation, etc.

No MeSH data available.


Related in: MedlinePlus

N2 adsorption-desorption curves and pore size distribution. N2 adsorption-desorption curves (a), the insert shows the impact of the amount of surfactants on the crystallite size (D) and BET area (S). Pore size distribution for the CeO2 powder (b).
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Figure 4: N2 adsorption-desorption curves and pore size distribution. N2 adsorption-desorption curves (a), the insert shows the impact of the amount of surfactants on the crystallite size (D) and BET area (S). Pore size distribution for the CeO2 powder (b).

Mentions: Figure 4a shows the typical hysteresis loop form of N2 adsorption-desorption curves for CeO2 which corresponds to type IV and is a characteristic of mesopores, while a large part of the pore volume is provided by mesopores with a 5- to 10-nm diameter (Figure 4b). On the DMOA example, it was shown as far as the CeO2 morphology is highly sensitive to the initial molar ratio value of St/Ce in the reaction medium. So, the increase of this value from 1 to 5 leads to an increase in the crystallite size by two times with a simultaneous decrease in the BET area by 2.5 times. However, a further increase in this ratio results in a reverse effect (insert of Figure 4a).


Wet-chemistry processing of powdery raw material for high-tech ceramics.

Trusova EA, Vokhmintcev KV, Zagainov IV - Nanoscale Res Lett (2012)

N2 adsorption-desorption curves and pore size distribution. N2 adsorption-desorption curves (a), the insert shows the impact of the amount of surfactants on the crystallite size (D) and BET area (S). Pore size distribution for the CeO2 powder (b).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3275523&req=5

Figure 4: N2 adsorption-desorption curves and pore size distribution. N2 adsorption-desorption curves (a), the insert shows the impact of the amount of surfactants on the crystallite size (D) and BET area (S). Pore size distribution for the CeO2 powder (b).
Mentions: Figure 4a shows the typical hysteresis loop form of N2 adsorption-desorption curves for CeO2 which corresponds to type IV and is a characteristic of mesopores, while a large part of the pore volume is provided by mesopores with a 5- to 10-nm diameter (Figure 4b). On the DMOA example, it was shown as far as the CeO2 morphology is highly sensitive to the initial molar ratio value of St/Ce in the reaction medium. So, the increase of this value from 1 to 5 leads to an increase in the crystallite size by two times with a simultaneous decrease in the BET area by 2.5 times. However, a further increase in this ratio results in a reverse effect (insert of Figure 4a).

Bottom Line: The purpose of this study was to develop wet-chemistry approaches for the synthesis of ultradispersed and mesoporous metal oxide powders and powdery composites intended for usage in the production of ceramic materials with desired properties.It was found that morphological parameters of the metal oxide obtained by the modified sol-gel technique depend nonlinearly on the initial molar ratio value of the sol stabilizer and metal in the reaction medium as well as the nature of the stabilizer.The developed laboratory technology corresponds to the conception of soft chemistry and may be adapted to the manufacture of ultradispersed materials for catalysis, solar cells, fuel cells, semiconductors, sensors, low-sized electronic devices of new generation, etc.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratory of Functional Ceramics, A,A, Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninsky pr, 49, Moscow, 119991, Russia. vokirill@gmail.com.

ABSTRACT
The purpose of this study was to develop wet-chemistry approaches for the synthesis of ultradispersed and mesoporous metal oxide powders and powdery composites intended for usage in the production of ceramic materials with desired properties. The focus is on the development of template synthesis of mesoporous metal silicates as well as obtaining nano- and subnanopowders by a modified sol-gel technique and template methods. Families of mesoporous (2 to 300 nm) metal silicates and nano-oxides and subnanopowders (4 to 300 nm) were synthesized by the template method and modified sol-gel technique, respectively. Texture and morphology of the obtained objects have been studied by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller analysis, and N2 adsorption-desorption. It was found that morphological parameters of the metal oxide obtained by the modified sol-gel technique depend nonlinearly on the initial molar ratio value of the sol stabilizer and metal in the reaction medium as well as the nature of the stabilizer. It has been shown that the nature of structure-directing components determines the morphology of the silicate obtained by the template method: dispersion and shape of its particles. The developed laboratory technology corresponds to the conception of soft chemistry and may be adapted to the manufacture of ultradispersed materials for catalysis, solar cells, fuel cells, semiconductors, sensors, low-sized electronic devices of new generation, etc.

No MeSH data available.


Related in: MedlinePlus