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  • Organizované mesoporézní vrstvy SiO2 s úzkou distribucí velikostí pórů s maximem kolem 6 nm, které byly rovnoměrně funkcionalizovány snadno protonovatelnými aminoskupinami, vykazují vynikající permselektivní membránové vlastnosti. Jejich selektivitu a permeabilitu lze reverzibilně řídit změnou pH. Tok hexacyanoferátových Fe(CN)63- aniontů, hexaamino-rutheniových Ru(NH3)63+ kationtů a neutrálních ferocene metanolových molekul vrstvami funkcionalizovanými aminoskupinami byl sledován cyklickou voltametrií při rozdílném pH roztoku. V závislosti na jejich náboji, tok iontů může být kompletně blokován nebo naopak zesílen, zatímco permeace nenabitých specií je negativně ovlivněna změnou pH pouze nepatrně. Vysoká porozita membrán zajišťuje značné penetrační rychlosti analytů a mnohem rychlejší odezvu na změnu pH ve srovnání s typickými kompaktními organickými polymerními vrstvami. (cs)
  • Organized mesoporous layers of SiO2 with narrow pore size distribution centered at ca. 7 nm, which were uniformly functionalized with readily protonated amino groups, exhibit excellent permselective membrane properties. Their selectivity and permeability can be reversibly controlled by changing pH. The flux of hexacyanoferrate Fe(CN)63- anions, hexaamino-ruthenium Ru(NH3)63+ cations, and neutral ferrocene methanol molecules through the amino functionalized silica layers was monitored by cyclic voltammetry at different solution pH values. Depending on their charges, the flux of ions can be completely blocked or enhanced, while the permeation of uncharged species is affected adversely only in a limited extent by the change in pH. The high membrane porosity ensures fast penetration rates of the analytes and much faster response to the changes in pH compared to those of typical compact organic polymer layers.
  • Organized mesoporous layers of SiO2 with narrow pore size distribution centered at ca. 7 nm, which were uniformly functionalized with readily protonated amino groups, exhibit excellent permselective membrane properties. Their selectivity and permeability can be reversibly controlled by changing pH. The flux of hexacyanoferrate Fe(CN)63- anions, hexaamino-ruthenium Ru(NH3)63+ cations, and neutral ferrocene methanol molecules through the amino functionalized silica layers was monitored by cyclic voltammetry at different solution pH values. Depending on their charges, the flux of ions can be completely blocked or enhanced, while the permeation of uncharged species is affected adversely only in a limited extent by the change in pH. The high membrane porosity ensures fast penetration rates of the analytes and much faster response to the changes in pH compared to those of typical compact organic polymer layers. (en)
Title
  • Ion-permselective pH-switchable mesoporous SiO2 thin layers
  • Iontově permselektivní mesoporézní tenké vrstvy SiO2 řízené změnou pH (cs)
  • Ion-permselective pH-switchable mesoporous SiO2 thin layers (en)
skos:prefLabel
  • Ion-permselective pH-switchable mesoporous SiO2 thin layers
  • Iontově permselektivní mesoporézní tenké vrstvy SiO2 řízené změnou pH (cs)
  • Ion-permselective pH-switchable mesoporous SiO2 thin layers (en)
skos:notation
  • RIV/61388955:_____/07:00087869!RIV08-AV0-61388955
http://linked.open.../vavai/riv/strany
  • 1640;1647
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • R, Z(AV0Z40400503)
http://linked.open...iv/cisloPeriodika
  • 7
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
  • 427549
http://linked.open...ai/riv/idVysledku
  • RIV/61388955:_____/07:00087869
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • thin layers; SiO2; mesoporous silica layers (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • US - Spojené státy americké
http://linked.open...ontrolniKodProRIV
  • [3CE59455F732]
http://linked.open...i/riv/nazevZdroje
  • Chemistry of Materials
http://linked.open...in/vavai/riv/obor
http://linked.open...ichTvurcuVysledku
http://linked.open...cetTvurcuVysledku
http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 19
http://linked.open...iv/tvurceVysledku
  • Rathouský, Jiří
  • Wark, M.
  • Fattakhova Rohlfing, D.
http://linked.open...n/vavai/riv/zamer
issn
  • 0897-4756
number of pages
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