Preparation and formation mechanism of three-dimensionally ordered macroporous (3DOM) MgO, MgSO{sub 4}, CaCO{sub 3}, and SrCO{sub 3}, and photonic stop band properties of 3DOM CaCO{sub 3}

Journal Article · Mon Aug 15 04:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.06.028· OSTI ID:21580178

Sadakane, Masahiro ^[1]; Kato, Rika; Murayama, Toru ^[2]; Ueda, Wataru ^[2]

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1. Chemistry and Chemical Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527 (Japan)
2. Catalysis Research Center, Hokkaido University, N-21, W-10, Sapporo 001-0021 (Japan)

Three-dimensionally ordered macroporous (3DOM) magnesium (Mg) oxide (MgO), MgSO{sub 4}, calcium (Ca) carbonate (CaCO{sub 3}), and strontium (Sr) carbonate (SrCO{sub 3}) were prepared using a colloidal crystal of polymer spheres as a template. Ethanol or ethanol-water solution of metal salts (acetate or nitrate) and citric acid was infiltrated into the void of the colloidal crystal template of a monodispersed poly(methyl methacrylate) (PMMA) sphere. Heating of this PMMA-metal salt-citric acid composite produced the desired well-ordered 3DOM materials with a high pore fraction, which was confirmed by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and ultraviolet-visible (UV-vis) diffuse reflectance spectra. The presence of citric acid is crucial for production of the 3DOM structures. Reaction of citric acid with metal salt produces metal citrate solid in the void of PMMA spheres, which is necessary to maintain the 3DOM structure during the calcination process. 3DOM CaCO{sub 3} shows opalescent colors because of it's photonic stop band properties. - Graphical abstract: Well-ordered 3-dimensionally ordered macroporous MgO, MgSO{sub 4}, CaCO{sub 3}, and SrCO{sub 3} materials were obtained in a high pore fraction. Highlights: > An easy preparation method of 3D ordered macroporous (3DOM) MgO, MgSO{sub 4}, CaCO{sub 3}, and SrCO{sub 3} materials. > Their structural characterization. > Their formation mechanism. > Photonic properties of 3DOM CaCO{sub 3}.

• OSTI ID: 21580178
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 8 Vol. 184; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ALCOHOLS
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
AQUEOUS SOLUTIONS
CALCIUM
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CARBOXYLIC ACID ESTERS
CARBOXYLIC ACIDS
CHALCOGENIDES
CITRIC ACID
COHERENT SCATTERING
CRYSTALS
DIFFRACTION
DISPERSIONS
ELECTRON MICROSCOPY
ELEMENTS
ESTERS
ETHANOL
HOMOGENEOUS MIXTURES
HYDROXY ACIDS
HYDROXY COMPOUNDS
MAGNESIUM
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MAGNESIUM SULFATES
MATERIALS
METALS
METHACRYLIC ACID ESTERS
MICROSCOPY
MIXTURES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
PMMA
POLYACRYLATES
POLYMERS
POLYVINYLS
SCANNING ELECTRON MICROSCOPY
SCATTERING
SOLIDS
SOLUTIONS
STRONTIUM
STRONTIUM CARBONATES
STRONTIUM COMPOUNDS
SULFATES
SULFUR COMPOUNDS
THREE-DIMENSIONAL CALCULATIONS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION