No abstract

No abstract

No abstract

No abstract

No abstract

No abstract

A method for the fabrication of hollow silica nanospheres, a facile one-pot hydrothermal route, is described. Heating of an aqueous solution of water glass and D-glucose to 180 °C for 24 h affords-as indicated by transmission electron microscopy-a nanospherical composite consisting of a silica shell sheathing a carbonaceous core. Subsequent removal of the carbonaceous interior through oxidation in air produces hollow silica structures. Variation of the concentration of the two jointly dissolved chemicals enables a variation of the thickness of the silica shell. The hollow silica particles were characterized by means of SEM, TEM, XRD, IR spectroscopy, thermogravimetrical analysis (TGA), and sorption measurements.

3D porous silica hollow nanospheres (PSHNSs) with mesoporous walls have been successfully fabricated by simple template-assisted method using tetraethoxysilan (TEOS) as a silica precursor and glucose-derived functionalized carbon spheres (FCSs) as hard templates. Template-precursor hybrid composite spheres were formed by direct adsorption of the silica precursor onto the surface layers of the FCSs. After etching of the template via oxidation in air, free standing 3D PSHNSs were obtained. The resulting PSHNSs were~85 nm in size as indicated by both SEM and TEM images. BET analysis has shown that nanospheres to have a large specific surface area up to 400 m 2 /g. The fascinating structure of 3D PSHNSs may provide more accessibility and good contacts with reactants that is very important in the fields of catalysts, gas adsorbent, heavy metals removal, electronics, and so on.[a] Dr.