About: Hydrothermal rehydroxylation of kaolinite studied by thermal analysis

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	The effect of hydrothermal conditions on process of kaolinite rehydroxylation at 180 °C and 230 °C and for soaking times from 1 to 200 hour was studied by thermal analysis (DTA, DSC, TG). It is shown that the kaolinite dehydroxylation of rehydroxylated samples shifts to lower temperatures compared to the original kaolinite. Amounts of kaolinite in rehydroxylated samples were calculated from TG curves. The curve of the kaolinite mass gain plotted against the time of hydrothermal treatment indicates a two stage process with a different mass gain rate representing short and long-time measurements. Multiple dehydroxylation was studied by repeated calcinations (2 h at 600 °C) and hydrothermal treatments (10 h at 230 °C). It was proved that values of activation energy (Ea) of multiple dehydroxylations decreased with the increasing number of repeated treatments. Conclusions of the study were applied for the investigation of kaolinite origin in archaeological samples from Roztoky near Prague. The effect of hydrothermal conditions on process of kaolinite rehydroxylation at 180 °C and 230 °C and for soaking times from 1 to 200 hour was studied by thermal analysis (DTA, DSC, TG). It is shown that the kaolinite dehydroxylation of rehydroxylated samples shifts to lower temperatures compared to the original kaolinite. Amounts of kaolinite in rehydroxylated samples were calculated from TG curves. The curve of the kaolinite mass gain plotted against the time of hydrothermal treatment indicates a two stage process with a different mass gain rate representing short and long-time measurements. Multiple dehydroxylation was studied by repeated calcinations (2 h at 600 °C) and hydrothermal treatments (10 h at 230 °C). It was proved that values of activation energy (Ea) of multiple dehydroxylations decreased with the increasing number of repeated treatments. Conclusions of the study were applied for the investigation of kaolinite origin in archaeological samples from Roztoky near Prague. (en)
Title	Hydrothermal rehydroxylation of kaolinite studied by thermal analysis Hydrothermal rehydroxylation of kaolinite studied by thermal analysis (en)
skos:prefLabel	Hydrothermal rehydroxylation of kaolinite studied by thermal analysis Hydrothermal rehydroxylation of kaolinite studied by thermal analysis (en)
skos:notation	RIV/60461373:22310/13:43895568!RIV14-MSM-22310___
http://linked.open...avai/riv/aktivita	S
http://linked.open...avai/riv/aktivity	S
http://linked.open...iv/cisloPeriodika	4
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Kloužek, Jaroslav Kloužková, Alexandra Zemenová, Petra
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Vysoká škola chemicko-technologická v Praze / Fakulta chemické technologie
http://linked.open...dnocenehoVysledku	78509
http://linked.open...ai/riv/idVysledku	RIV/60461373:22310/13:43895568
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Archaeological ceramics; Rehydroxylation; Dehydroxylation; Thermal analysis; Kaolinite (en)
http://linked.open.../riv/klicoveSlovo	Thermal analysis Kaolinite Dehydroxylation Archaeological ceramics Rehydroxylation
http://linked.open...odStatuVydavatele	CZ - Česká republika
http://linked.open...ontrolniKodProRIV	[77D6936D89BA]
http://linked.open...i/riv/nazevZdroje	Ceramics-Silikáty
http://linked.open...in/vavai/riv/obor	AC
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	57
http://linked.open...iv/tvurceVysledku	Kloužek, Jaroslav Kloužková, Alexandra Zemenová, Petra Kohoutková, Martina
issn	0862-5468
number of pages	6 (xsd:int)
http://localhost/t...ganizacniJednotka	22310

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