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Preparation of Nanocrystalline TiO2 Monoliths by Using Modified Supercritical Carbon Dioxide.
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SYSNO ASEP 0490283 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Preparation of Nanocrystalline TiO2 Monoliths by Using Modified Supercritical Carbon Dioxide. Author(s) Cerhová, Marie (UCHP-M) SAI
Matějová, L. (CZ)
Jandová, Věra (UCHP-M) RID, ORCID, SAI
Daniš, S. (CZ)
Dřínek, Vladislav (UCHP-M) RID, ORCID, SAI
Sajfrtová, Marie (UCHP-M) RID, ORCID, SAISource Title Journal of Supercritical Fluids. - : Elsevier - ISSN 0896-8446
Roč. 137, JUL 2018 (2018), s. 93-100Number of pages 8 s. Language eng - English Country NL - Netherlands Keywords TiO2 monolith ; supercritical carbon dioxide ; crystallization Subject RIV CA - Inorganic Chemistry OECD category Inorganic and nuclear chemistry R&D Projects GA14-23274S GA ČR - Czech Science Foundation (CSF) Institutional support UCHP-M - RVO:67985858 UT WOS 000431163500012 EID SCOPUS 85044478433 DOI https://doi.org/10.1016/j.supflu.2018.02.001 Annotation A flow supercritical fluid crystallization with and without modifier/s was applied to prepare nanocrystalline TiO2 monoliths without subsequent thermal treatment. The effect of processing conditions (temperature, pressure, water concentration, type of modifier: water or ethanol and water) on the crystallization, texture and purity of TiO2 was investigated. It was revealed that one- or multi-step processing by scCO2 with modifier leads to direct crystallization of TiO2 monoliths of anatase-brookite crystal structure even at mild processing temperature of 40°C and 30 MPa. 15 wt.% of water was determined to be the optimal concentration of water in scCO2 as a crystallization agent. Processing temperature affected anatase and brookite crystallite-size. Processing pressure affected crystallization and purity of monolithic TiO2. The pre-drying as well as the post-drying by scCO2 at 40°C visibly improved the solidity of TiO2 monolith and stabilized brookite crystallites. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2019
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