Preparation of porous solids composed of layered niobate walls from colloidal mixtures of niobate nanosheets and polystyrene spheres

Nobuyoshi Miyamoto, Kazuyuki Kuroda

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    Macroporous solids with crystalline layered walls were fabricated from colloidal mixtures of size-controlled niobate nanosheets and polystyrene spheres. The macroporous solids, obtained after burning off the spheres, were characterized by scanning electron microscopy and X-ray diffraction. The obtained structures strongly depended on the lateral dimension L of the nanosheets used. When small nanosheets (L = 100   nm) were used, partly ordered macroporous solids with interconnected pores were obtained, whereas sponge-like random macroporous structures were obtained with larger nanosheets (L = 190 and 270 nm). Peapod-like hollow structures were obtained when we used small (L = 190   nm) and very large (L = 3   μm) nanosheets at the same time. The microstructure of the pore walls was controllable by changing the calcination conditions. The walls were composed of propylammonium/K4Nb6O17 intercalation compound which has a layered structure with exchangeable cations in the interlayer space, stable up to 350 °C for 6 h on calcination. The walls were converted to crystalline K8Nb18O49 after calcination at 500 °C for 6 h.

    Original languageEnglish
    Pages (from-to)369-373
    Number of pages5
    JournalJournal of Colloid and Interface Science
    Issue number1
    Publication statusPublished - 2007 Sep 1



    • Inorganic nanosheet
    • Ion-exchangeable layered niobate
    • Macroporous solid

    ASJC Scopus subject areas

    • Colloid and Surface Chemistry
    • Physical and Theoretical Chemistry
    • Surfaces and Interfaces

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