Preparation of cellular alumina ceramics via biological foaming with yeast and its microstructural characterization via stereological relations

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F15%3A43898241" target="_blank" >RIV/60461373:22310/15:43898241 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Preparation of cellular alumina ceramics via biological foaming with yeast and its microstructural characterization via stereological relations

Popis výsledku v původním jazyce

The preparation of highly porous (cellular) alumina ceramics via biological foaming with yeast is described and its microstructure is characterized via image analysis using stereological relations. The ceramics prepared usually have total porosities in the range 78-84% and the porosities related to large pores (volume fraction of foam bubbles) are usually in the range 58-75%. The mean chord length and Jeffries size, i.e. pore size measures related to the interface density and the mean curvature integraldensity, respectively, are rather close to each other (usually 0.8-1.4 and 0.8-1.2 mm) with a ratio close to unity (0.9-1.4), and the mean surface-to-surface distance gives a realistic picture of the average wall thickness (usually 0.46-0.69 mm). Usinga special processing variant (excess ethanol addition) it is possible to obtain microstructures with lower porosity (total porosity 68-70%, foam bubble volume fractions 50-56%) and smaller pore size (approx. 0.5 mm).

Název v anglickém jazyce

Preparation of cellular alumina ceramics via biological foaming with yeast and its microstructural characterization via stereological relations

Popis výsledku anglicky

The preparation of highly porous (cellular) alumina ceramics via biological foaming with yeast is described and its microstructure is characterized via image analysis using stereological relations. The ceramics prepared usually have total porosities in the range 78-84% and the porosities related to large pores (volume fraction of foam bubbles) are usually in the range 58-75%. The mean chord length and Jeffries size, i.e. pore size measures related to the interface density and the mean curvature integraldensity, respectively, are rather close to each other (usually 0.8-1.4 and 0.8-1.2 mm) with a ratio close to unity (0.9-1.4), and the mean surface-to-surface distance gives a realistic picture of the average wall thickness (usually 0.46-0.69 mm). Usinga special processing variant (excess ethanol addition) it is possible to obtain microstructures with lower porosity (total porosity 68-70%, foam bubble volume fractions 50-56%) and smaller pore size (approx. 0.5 mm).

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JH - Keramika, žáruvzdorné materiály a skla

OECD FORD obor

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Projekt

<a href="/cs/project/GAP108%2F12%2F1170" target="_blank" >GAP108/12/1170: Porézní keramika s řízenou elasticitou a tepelnou vodivostí</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of the European Ceramic Society

ISSN

0955-2219

e-ISSN

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Svazek periodika

35

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

BE - Belgické království

Počet stran výsledku

10

Strana od-do

187-196

Kód UT WoS článku

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EID výsledku v databázi Scopus

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