Preparation of nanocrystalline TiO2 monoliths by using modified supercritical carbon dioxide

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10380459" target="_blank" >RIV/00216208:11320/18:10380459 - isvavai.cz</a>
Alternative codes found
RIV/67985858:_____/18:00490283 RIV/61989100:27710/18:10239703
Result on the web
<a href="https://doi.org/10.1016/j.supflu.2018.02.001" target="_blank" >https://doi.org/10.1016/j.supflu.2018.02.001</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.supflu.2018.02.001" target="_blank" >10.1016/j.supflu.2018.02.001</a>

Result language
angličtina
Original language name
Preparation of nanocrystalline TiO2 monoliths by using modified supercritical carbon dioxide
Original language description
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. Gel blocks for processing were prepared by nitric acid-catalysed sol-gel synthesis. It was revealed that one- or multi-step processing by scCO(2) with modifier leads to direct crystallization of TiO2 monoliths of anatase-brookite crystal structure even at mild processing temperature of 40 degrees C and 30 MPa. 15 wt. % of water was determined to be the optimal concentration of water in scCO(2) as a crystallization agent. Processing temperature affected the anatase and brookite crystallite-size. Processing pressure affected the crystallization and purity of monolithic TiO2. The pre-drying as well as the post-drying by scCO(2) at 40 degrees C visibly improved the solidity of TiO2 monolith and stabilized brookite crystallites.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
<a href="/en/project/GA14-23274S" target="_blank" >GA14-23274S: Unconventional preparation of nanostructured metal oxides by using pressurized and supercritical fluids</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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