Počet záznamů: 1
TiO2 Powders Synthesized by Pressurized Fluid Extraction and Supercritical Drying: Effect of Water and Methanol on Structural Properties and Purity
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SYSNO ASEP 0380909 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název TiO2 Powders Synthesized by Pressurized Fluid Extraction and Supercritical Drying: Effect of Water and Methanol on Structural Properties and Purity Tvůrce(i) Matějová, Lenka (UCHP-M) RID, ORCID, SAI
Matěj, Z. (CZ)
Fajgar, Radek (UCHP-M) RID, ORCID, SAI
Cajthaml, Tomáš (MBU-M) RID, ORCID
Šolcová, Olga (UCHP-M) RID, ORCID, SAIZdroj.dok. Materials Research Bulletin. - : Elsevier - ISSN 0025-5408
Roč. 47, č. 11 (2012), s. 3573-3579Poč.str. 7 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova oxides ; sol-gel chemistry ; X-ray diffraction Vědní obor RIV CF - Fyzikální chemie a teoretická chemie CEP GP104/09/P290 GA ČR - Grantová agentura ČR Institucionální podpora UCHP-M - RVO:67985858 ; MBU-M - RVO:61388971 UT WOS 000311865200082 DOI https://doi.org/10.1016/j.materresbull.2012.06.062 Anotace Pressurized water extraction followed by sub/supercritical methanol drying was used for synthesis of TiO2 from gels prepared by sol–gel technique using Triton X-114 like template. It was proved that pressurized water causes titania crystallization. Subsequent sub/supercritical methanol drying is responsible for total elimination of the rest of organic phase originating from the template. The impact of temperature and pressure modifications on titania purity was more essential for pressurized water extraction. The specific surface area significantly increases with removal of the residual organic phase. Anatase was a dominant crystalline phase. The fraction of minor brookite was in the range 20–30 wt.%. In situ XRD showed stability of titania crystallites size up to 300 8C and the presence of brookite crystallites even up to 600 8C. The correlation between Raman FWHM and XRD crystallite size was not influenced by the presence of organic phase and was more sensitive for anatase Eg band 647 cm-1. Pracoviště Ústav chemických procesů Kontakt Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Rok sběru 2013
Počet záznamů: 1