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.
- Inorganic nanosheet
- Ion-exchangeable layered niobate
- Macroporous solid
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Colloid and Surface Chemistry