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| Description
| - The effects of short milling (2 x 10 min) of two fractions of kaolinite (< 5 μm (S5) and 5-45 μm (S)), previously expanded by intercalation with 20 wt.% and 40 wt.% urea (U) and exfoliated/delaminated using low-temperature procedures, were studied. Untreated and treated kaolinite samples were examined by X-ray powder diffraction (XRPD), and their specific surface area (SSA), particle size distribution (PSD) and Fourier-transform infrared (FTIR) spectra were measured and interpreted. Samples intercalated with different concentrations of urea and subsequently exfoliated during thermal or low-temperature washing exhibit a variable intensity of the 001 diffractions of kaolinite (K) and interstratified intermediate kaolinite (H) with randomly interstratified layers of grafted urea and water. Low-temperature washing procedures yield H structures interstratified with layers grafted with urea and water with a mean d001 = 8.168(50) Å. After thermal washing procedures, H structures
- The effects of short milling (2 x 10 min) of two fractions of kaolinite (< 5 μm (S5) and 5-45 μm (S)), previously expanded by intercalation with 20 wt.% and 40 wt.% urea (U) and exfoliated/delaminated using low-temperature procedures, were studied. Untreated and treated kaolinite samples were examined by X-ray powder diffraction (XRPD), and their specific surface area (SSA), particle size distribution (PSD) and Fourier-transform infrared (FTIR) spectra were measured and interpreted. Samples intercalated with different concentrations of urea and subsequently exfoliated during thermal or low-temperature washing exhibit a variable intensity of the 001 diffractions of kaolinite (K) and interstratified intermediate kaolinite (H) with randomly interstratified layers of grafted urea and water. Low-temperature washing procedures yield H structures interstratified with layers grafted with urea and water with a mean d001 = 8.168(50) Å. After thermal washing procedures, H structures (en)
- V práci je uvedena nízkoteplotní exfoliace/delaminace dvou frakcí kaolinitu (< 5 μm (S5) a 5-45 μm (S) po jejich předchozích interkalacích s močovinou (U), 20 hm.% a 40 hm.%, a krátkodobém mletí (2x10 min). Vzorky byly analyzovány pomocí rentgenové práškové difrakce (XRPD), do interpretací výsledků přispěla měření specifického povrchu (SSA), distribuce velikosti částic (PSD) a infračervená spektroskopie (FTIR). Exfoliované vzorky obsahovaly fázi 7 Å kaolinitu (K) a další krystalickou fázi (H) s průměrnou hodnotou d001 = 8.322(60) Å, která odpovídá vrstevnaté struktuře s roubovanými vrstvami močoviny či vody. Vzorky S5 po exfoliaci vykazovaly hodnoty SSA zvětšené z 20.2 m2/g na 25 - 35 m2/g, přičemž median zrn se výrazně nezměnil, o čemž svědčí jeho poměrně stálá průmerná velikost (s malým rozptylem) MD = 2.80(20) μm. Exfoliované/ delaminované vzorky S měly výrazně větší hodnoty SSA (9.4 m2/g u S na 12.5 m2/g až 20.5 m2/g) avšak ve srovnání s S5 došlo k t (cs)
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| Title
| - Exfoliation/delamination of kaolinite by low-temperature washing of kaolinite-urea intercalates
- Exfoliation/delamination of kaolinite by low-temperature washing of kaolinite-urea intercalates (en)
- Exfoliace/delaminace kaolinitu nízkoteplotním promýváním kaolinit-močovinových interkalátů. (cs)
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| skos:prefLabel
| - Exfoliation/delamination of kaolinite by low-temperature washing of kaolinite-urea intercalates
- Exfoliation/delamination of kaolinite by low-temperature washing of kaolinite-urea intercalates (en)
- Exfoliace/delaminace kaolinitu nízkoteplotním promýváním kaolinit-močovinových interkalátů. (cs)
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| skos:notation
| - RIV/61989100:27640/07:00015156!RIV08-GA0-27640___
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| http://linked.open.../vavai/riv/strany
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
| - P(GA205/05/2548), Z(MSM6198910016)
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/61989100:27640/07:00015156
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - Kaolinite; Urea; Intercalation; Exfoliation; Delamination; X-ray powder diffraction Structural application. (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
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| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
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| http://linked.open...iv/tvurceVysledku
| - Matějka, Vlastimil
- Valášková, Marta
- Čapková, Pavla
- Rieder, Milan
- Slíva, A.
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| http://linked.open...n/vavai/riv/zamer
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| issn
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| number of pages
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| http://localhost/t...ganizacniJednotka
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| is http://linked.open...avai/riv/vysledek
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