About: Permeability of Grain Boundaries in well Defined Silicalite-1 Polycrystalline Layers and Single Crystals     Goto   Sponge   NotDistinct   Permalink

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Description
  • Self-supporting silicalite-1 layers were grown on mercury surface from clear solutions at temperatures 140-180 oC. Large silicalite-1 crystals were synthesized using TPABr as template. Layer morphology and thickness were characterized by SEM. Phase purity of silicalite-1 and orientation of crystals were determined by XRD. Layers with the thickness > 40 .mu.m were found to be highly compact. Wet HF etching of as-synthesized polycrystalline silicalite-1 layers caused formation of deep sharp slits at grain boundaries and thus it visualized them. Contrary to this result etching of calcined layers led to a kind of a negative image represented by preserved thin shells at crystal boundaries which were found to be impregnated by carbon residues formed during template removal. Results of etching experiments give a strong indication of the existence of a thin amorphous silica interface between neighbouring crystals. The etching patterns were somewhat different for large silicalite-1 crystals.
  • Self-supporting silicalite-1 layers were grown on mercury surface from clear solutions at temperatures 140-180 oC. Large silicalite-1 crystals were synthesized using TPABr as template. Layer morphology and thickness were characterized by SEM. Phase purity of silicalite-1 and orientation of crystals were determined by XRD. Layers with the thickness > 40 .mu.m were found to be highly compact. Wet HF etching of as-synthesized polycrystalline silicalite-1 layers caused formation of deep sharp slits at grain boundaries and thus it visualized them. Contrary to this result etching of calcined layers led to a kind of a negative image represented by preserved thin shells at crystal boundaries which were found to be impregnated by carbon residues formed during template removal. Results of etching experiments give a strong indication of the existence of a thin amorphous silica interface between neighbouring crystals. The etching patterns were somewhat different for large silicalite-1 crystals. (en)
  • Samonosné vrstvy silikalitu-1 byly pěstovány na povrchu rtuti z jemně koloidních roztoků při teplotách 140-180 oC, a to pomocí templátu TPABr. Podobně byly syntetizovány i velké krystaly. Morfologie vrstev a jejich tloušťka byly zjišťovány elektronovým mikroskopem. Krystalinita a orientace krystalů byla určována rentgenovou difrakcí. Vrstvy o tloušťce nad 40 mikronů byly shledány vysoce kompaktními. Leptání polykrystalických vrstev pomocí HF vedlo k vytvoření ostrých štěrbin mezi krystaly. U kalcinovaných vrstev zůstaly během leptání zachovány krystalové slupky, a to z příčiny jejich impregnace uhlíkatými zbytky. Výsledky leptání svědčí o amorfní fázi mezi sousedícími krystaly. Leptací obrazce jsou jiné u velkých krystalů. Do surových krystalů proniká HF podél hranic pyramidálních domén. Kalcinované krystaly se rozpouštějí jednotně po celém povrchu. Malé kalcinované krystaly jsou naopak vysoce odolné. (cs)
Title
  • Permeability of Grain Boundaries in well Defined Silicalite-1 Polycrystalline Layers and Single Crystals
  • Propustnost podél hranic zrn v dobře definovaných polykrystalických vrstvách silikalitu-1 a v samostatných krystalech (cs)
  • Permeability of Grain Boundaries in well Defined Silicalite-1 Polycrystalline Layers and Single Crystals (en)
skos:prefLabel
  • Permeability of Grain Boundaries in well Defined Silicalite-1 Polycrystalline Layers and Single Crystals
  • Propustnost podél hranic zrn v dobře definovaných polykrystalických vrstvách silikalitu-1 a v samostatných krystalech (cs)
  • Permeability of Grain Boundaries in well Defined Silicalite-1 Polycrystalline Layers and Single Crystals (en)
skos:notation
  • RIV/61388955:_____/04:00101100!RIV/2005/AV0/A54005/N
http://linked.open.../vavai/riv/strany
  • 1;11
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • P(GA104/03/0680), P(GA104/04/0963), Z(AV0Z4040901)
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
http://linked.open.../riv/druhVysledku
http://linked.open...iv/duvernostUdaju
http://linked.open...titaPredkladatele
http://linked.open...dnocenehoVysledku
  • 579151
http://linked.open...ai/riv/idVysledku
  • RIV/61388955:_____/04:00101100
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • silicalite-1; single crystals; grain boundaries (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...ontrolniKodProRIV
  • [DE8F30FD74B9]
http://linked.open...v/mistoKonaniAkce
  • Praha
http://linked.open...i/riv/mistoVydani
  • Praha
http://linked.open...i/riv/nazevZdroje
  • Proceedings.CHISA 2004
http://linked.open...in/vavai/riv/obor
http://linked.open...ichTvurcuVysledku
http://linked.open...cetTvurcuVysledku
http://linked.open...vavai/riv/projekt
http://linked.open...UplatneniVysledku
http://linked.open...iv/tvurceVysledku
  • Kočiřík, Milan
  • Zikánová, Arlette
  • Brabec, Libor
http://linked.open...vavai/riv/typAkce
http://linked.open.../riv/zahajeniAkce
http://linked.open...n/vavai/riv/zamer
number of pages
http://purl.org/ne...btex#hasPublisher
  • Neuveden
https://schema.org/isbn
  • 80-86059-40-5
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