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  • Vrstvy i jednotlivé krystaly silikalitu-1 byly připraveny syntézou v koloidních roztocích za po-užití templátu TPA-Br. Jejich morfologie byla zjišťována řádkovacím elektronovým mikrosko-pem (SEM). Velké dvojčatné krystaly obarvené jódem byly též pozorovány mikroskopem světelným. Kompaktnost vrstev z kulových krystalů se jevila mnohem vyšší než kompaktnost vrstev z krystalů podlouhlých. Leptání surových polykrystalických vrstev pomocí HF vedlo ke vzniku ostrých štěrbin podél hranic zrn. Tím se tyto hranice staly viditelnými. Leptáním kalcinovaných vrstev se tvořil negativní obraz: zůstávaly zachovány tenké slupky obklopující krystaly, zatímco vlastní krystaly se rozpouštěly. Slupky (málo uspořádaná hmota SiO2 mezi sousedícími krystaly) byly odolné vůči HF díky přítomnosti organických zbytků, vzniklých kalcinací. Leptací obrazce na nekalcinovaných velkých krystalech-dvojčatech vykazovaly ostré štěrbiny podél styčných ploch jedinců-monokrystalů. (cs)
  • Silicalite-1 layers as well as individual crystal twins were synthesized from clear solutions using TPABr as template. Their morphology was characterized by scanning electron microscope (SEM). Large crystal twins coloured by iodine were also observed by light microscope. The compactness of a thin layer consisting of spherical crystals (twins) appeared much higher than that of prolonged ones. HF etching of as-synthesized polycrystalline silicalite-1 layers led to the formation of sharp slits along grain boundaries. So the grain boundaries became observable. Etching of calcined layers produced a sort of a negative image represented by preserved thin shells around dissolved crystals. Those shells - films of less organized silica remaining between neighboring crystals - were resistant against HF acid due to the presence of organic species formed during layer calcination. For large isolated silicalite-1 twins the etching patterns differed from those in layers.
  • Silicalite-1 layers as well as individual crystal twins were synthesized from clear solutions using TPABr as template. Their morphology was characterized by scanning electron microscope (SEM). Large crystal twins coloured by iodine were also observed by light microscope. The compactness of a thin layer consisting of spherical crystals (twins) appeared much higher than that of prolonged ones. HF etching of as-synthesized polycrystalline silicalite-1 layers led to the formation of sharp slits along grain boundaries. So the grain boundaries became observable. Etching of calcined layers produced a sort of a negative image represented by preserved thin shells around dissolved crystals. Those shells - films of less organized silica remaining between neighboring crystals - were resistant against HF acid due to the presence of organic species formed during layer calcination. For large isolated silicalite-1 twins the etching patterns differed from those in layers. (en)
Title
  • Silicalite-1 polycrystalline layers and crystal twins: Morphology and grain boundaries
  • Silicalite-1 polycrystalline layers and crystal twins: Morphology and grain boundaries (en)
  • Polykrystalické vrstvy a krystaly-dvojčata silikalitu-1: morfologie, hranice zrn (cs)
skos:prefLabel
  • Silicalite-1 polycrystalline layers and crystal twins: Morphology and grain boundaries
  • Silicalite-1 polycrystalline layers and crystal twins: Morphology and grain boundaries (en)
  • Polykrystalické vrstvy a krystaly-dvojčata silikalitu-1: morfologie, hranice zrn (cs)
skos:notation
  • RIV/61388955:_____/07:00081194!RIV07-AV0-61388955
http://linked.open.../vavai/riv/strany
  • 67;74
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • P(GA203/05/0846), Z(AV0Z40400503)
http://linked.open...iv/cisloPeriodika
  • 1
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
  • 449784
http://linked.open...ai/riv/idVysledku
  • RIV/61388955:_____/07:00081194
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • silicalite-1; HF acid; etching; grain boundaries (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • CN - Čínská lidová republika
http://linked.open...ontrolniKodProRIV
  • [A5E912FA56F4]
http://linked.open...i/riv/nazevZdroje
  • Materials Chemistry and Physics
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...v/svazekPeriodika
  • 102
http://linked.open...iv/tvurceVysledku
  • Kočiřík, Milan
  • Brabec, Libor
http://linked.open...n/vavai/riv/zamer
issn
  • 0254-0584
number of pages
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