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741637 
Journal Article 
Surfactant-assisted solvo- or hydrothermal fabrication and characterization of high-surface-area porous calcium carbonate with multiple morphologies 
Zhao, Z; Zhang, L; Dai, H; Du, Y; Meng, X; Zhang, R; Liu, Y; Deng, J 
2011 
1 
Microporous and Mesoporous Materials
ISSN: 1387-1811 
138 
1-3 
191-199 
WOS:000285168800025 
Hexagonally crystallized CaCO(3) materials with flower like, belt-like, network-like, coralloid, and hexagonal and rectangular parallelepiped
morphologies were selectively fabricated using the surfactant (cetyltrimethylammonium bromide,
sodium dodecyl sulfate, poly(N-vinyl-2-pyrrolidone or poly(ethylene glycol) (PEG)) mediated
solvo- or hydrothermal strategy with CaO powders as Ca source in an oleic acid (OA)/ethanol,
OA/ethylene glycol or water solvent, respectively. The as-obtained materials were characterized
by means of the techniques, such as X-ray diffraction, thermogravimetric analysis and
differential scanning calorimetry, Fourier transform infrared spectroscopy, high-resolution
scanning electron microscopy, high-resolution transmission electron microscopy, selected-area
electron diffraction, and N(2) adsorption-desorption measurement. It is shown that the morphology
of the CaCO(3) product was associated with the nature of surfactant and solvent and solvo- or
hydrothermal temperature. The surfactant-free fabricated CaCO(3) particles were cube-like in
morphology. The rise in solvo- or hydrothermal temperature favored the enhancement in surface
area of the CaCO(3) product. Among the as-fabricated CaCO(3) samples, the one derived
hydrothermally with PEG at 240 degrees C possessed the highest surface area (134 m(2)/g). Such a
high-surface-area wormhole-like mesoporous CaCO(3) sample could decompose below 800 degrees C to
mesoporous CaO with high surface area (110 m(2)/g). This reversible regeneration feature makes
the mesoporous calcite useful in gas adsorption and separation as well as catalysis. The possible
mechanisms for the multiply morphological CaCO(3) formation have also been discussed. (C) 2010
Elsevier Inc. All rights reserved. 
Surfactant; Solvothermal synthesis; Regular morphology; Porosity; Calcium carbonate 
Other
• Nanoscale Carbon