Layered sodium disilicates as precursors of mesoporous silicas. Part II: Hydration of δ-Na2Si2O5 and α-Na2Si2O5

• Autorzy: Michalik-Zym Alicja , Zimowska Małgorzata , Bielańska Elżbieta , Bahranowski Krzysztof , Serwicka Ewa

Identyfikatory

DOI

10.2478/v10002-007-0024-7

Warianty tytułu

PL

Warstwowe krzemiany sodu jako prekursory mezoporowatych krzemionek. II: Hydratacja δ-Na2Si2O5 i -Na2Si2O5

• Języki publikacji: EN

Abstrakty

EN

Reaction of δ-Na2Si2O5 and α-Na2Si2O5 with water at ambient conditions has been studied. The first substrate produced kanemite, the other a crystalline solid, assumed to be the layered hydrated α phase of yet unknown structure. Important differences have been observed in the kinetics of δ-Na2Si2O5 and α-Na2Si2O5 reactions with water, the phase transformation of the latter being distinctly slower. The observed different rates of hydration were associated with the different structural properties of the disilicates investigated. Hydrated δ-Na2Si2O5 and α-Na2Si2O5 possess, respectively, the platy and the needle-like morphology. Hydrated α-Na2Si2O5 contains less interlayer water, which is considered the reason for basal spacing being lower than that of kanemite. The interlayer water trapped between the layers of hydrated α-Na2Si2O5 is more strongly bound than that in kanemite.

PL

Reakcje δ-Na2Si2O5 i -Na2Si2O5 z wodą prowadzą do powstania uwodnionych krzemianów sodu, odpowiednio – kanemitu (z fazy δ-Na2Si2O5) i z fazy – jej uwodnionej formy o nieznanej strukturze. Kinetyki hydratacji tych krzemianów są zdecydowanie różne; faza δ ulega szybkiej transformacji, faza α – wolnej. Różne szybkości hydratacji można wiązać z różnicami strukturalnymi obu krzemianów sodu. Uwodniony δ-Na2Si2O5 wykształcony jest w formie płytek, podczas gdy uwodniony -Na2Si2O5 ma morfologię typu igieł. Różna jest również ilość wody międzypakietowej w obu hydratach; uwodniony δ-Na2Si2O5 posiada jej więcej ale słabiej związanej, natomiast uwodniony α-Na2Si2O5 mniej, lecz związanej silniej.

Słowa kluczowe

EN

Na2Si2O5; layered silicates; kanemite; hydration

PL

Na2Si2O5; krzemiany sodu; kanemit; hydratacja

• Wydawca: Mineralogical Society of Poland
• Czasopismo: Mineralogia
• Rocznik: 2007
• Tom: Vol. 38, iss. 2
• Strony: 161--170
• Opis fizyczny: Bibliogr. [17] poz., rys., wykr., tab.

Twórcy

autor

Michalik-Zym Alicja

• Polish Academy of Sciences, Institute of Catalysis and Surface Chemistry, ul. Niezapominajek 8, 30-239 Kraków, Poland

autor

Zimowska Małgorzata

• Polish Academy of Sciences, Institute of Catalysis and Surface Chemistry, ul. Niezapominajek 8, 30-239 Kraków, Poland

autor

Bielańska Elżbieta

• Polish Academy of Sciences, Institute of Catalysis and Surface Chemistry, ul. Niezapominajek 8, 30-239 Kraków, Poland

autor

Bahranowski Krzysztof

• Faculty of Geology, Geophysics and Environmental Protection, AGH-University of Science and Technology, al. Mickiewicza 30, 30--059 Kraków, Poland

autor

Serwicka Ewa

• Polish Academy of Sciences, Institute of Catalysis and Surface Chemistry, ul. Niezapominajek 8, 30-239 Kraków, Poland

Bibliografia

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• GARVIE L.A.J., DEVOUARD B., GROY T.L., CAMARA F., BUSECK P.R., 1999: Crystal structure of kanemite, NaHSi2O5 3H2O, from Aris phonolite, Namibia. American Mineralogist 84, 1170–1175.
• INAGAKI S., FUKUSHIMA Y., KURODA K., 1993: Synthesis of highly ordered mesoporous materials from a layered polysilicate. Journal of the Chemical Society, Chemical Communications 680–682.
• INAGAKI S., KOIWAI A., SUZUKI N., FUKUSHIMA Y., KURODA K., 1996: Syntheses of highly ordered mesoporous materials, FSM-16, derived from kanemite. Bulletin of the Chemical Society of Japan 69, 1449–1457.
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• YANIGASAWA T., SHIMIZU T., KURODA K., KATO C., 1990: Trimethylsilyl derivatives of alkyltrimethylammonium-kanemite complexes and their conversion to microporous SiO2 materials. Bulletin of the Chemical Society of Japan 63, 1535–1537.
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