Limits...
Wet chemical controllable synthesis of hematite ellipsoids with structurally enhanced visible light property.

Han C, Han J, Li Q, Xie J - ScientificWorldJournal (2013)

Bottom Line: The results showed that the product was mesoporous α -Fe2O3 and nearly elliptical in shape.Each hematite ellipsoid was packed by many α -Fe2O3 nanoparticles.The formation of these porous hematite ellipsoids could be attributed to the vapor pressure induced oriented assembling of lots of α -Fe2O3 nanoparticles.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical and Material Engineering, Hefei University, Hefei 230601, China ; Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China.

ABSTRACT
A facile and economic route has been presented for mass production of micro/nanostructured hematite microcrystals based on the wet chemical controllable method. The as-prepared samples were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and UV-Vis absorption spectroscopy. The results showed that the product was mesoporous α -Fe2O3 and nearly elliptical in shape. Each hematite ellipsoid was packed by many α -Fe2O3 nanoparticles. The values of vapor pressure in reaction systems played vital roles in the formation of porous hematite ellipsoids. Optical tests demonstrated that the micro/nanostructured elliptical hematite exhibited enhanced visible light property at room temperature. The formation of these porous hematite ellipsoids could be attributed to the vapor pressure induced oriented assembling of lots of α -Fe2O3 nanoparticles.

Show MeSH
Schematic illustration for formation of porous α-Fe2O3 ellipsoids.
© Copyright Policy - open-access
Related In: Results  -  Collection


getmorefigures.php?uid=PMC3814095&req=5

fig5: Schematic illustration for formation of porous α-Fe2O3 ellipsoids.

Mentions: Finally, the as-formed hematite nanoparticles would be further coarsened by an oriented-assembling mode in order to reduce the surface energy of α-Fe2O3 particles which were polar crystals and tended to spontaneously assemble [15, 16]. The proper value of vapor pressure will help α-Fe2O3 nanocrystals migrate and readjust more easily in a reactor. As a result, with the assemble going on, the porous hematite ellipsoid packed with many α-Fe2O3 nanoparticles would be formed. The above three stages have been illustrated in Figure 5. We acknowledge that the true formation mechanism of porous α-Fe2O3 elliptical structures is still unclear. However, it is obvious that the values of vapor pressure in a reactor are of great importance in the growth of porous α-Fe2O3 ellipsoids.


Wet chemical controllable synthesis of hematite ellipsoids with structurally enhanced visible light property.

Han C, Han J, Li Q, Xie J - ScientificWorldJournal (2013)

Schematic illustration for formation of porous α-Fe2O3 ellipsoids.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3814095&req=5

fig5: Schematic illustration for formation of porous α-Fe2O3 ellipsoids.
Mentions: Finally, the as-formed hematite nanoparticles would be further coarsened by an oriented-assembling mode in order to reduce the surface energy of α-Fe2O3 particles which were polar crystals and tended to spontaneously assemble [15, 16]. The proper value of vapor pressure will help α-Fe2O3 nanocrystals migrate and readjust more easily in a reactor. As a result, with the assemble going on, the porous hematite ellipsoid packed with many α-Fe2O3 nanoparticles would be formed. The above three stages have been illustrated in Figure 5. We acknowledge that the true formation mechanism of porous α-Fe2O3 elliptical structures is still unclear. However, it is obvious that the values of vapor pressure in a reactor are of great importance in the growth of porous α-Fe2O3 ellipsoids.

Bottom Line: The results showed that the product was mesoporous α -Fe2O3 and nearly elliptical in shape.Each hematite ellipsoid was packed by many α -Fe2O3 nanoparticles.The formation of these porous hematite ellipsoids could be attributed to the vapor pressure induced oriented assembling of lots of α -Fe2O3 nanoparticles.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical and Material Engineering, Hefei University, Hefei 230601, China ; Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China.

ABSTRACT
A facile and economic route has been presented for mass production of micro/nanostructured hematite microcrystals based on the wet chemical controllable method. The as-prepared samples were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and UV-Vis absorption spectroscopy. The results showed that the product was mesoporous α -Fe2O3 and nearly elliptical in shape. Each hematite ellipsoid was packed by many α -Fe2O3 nanoparticles. The values of vapor pressure in reaction systems played vital roles in the formation of porous hematite ellipsoids. Optical tests demonstrated that the micro/nanostructured elliptical hematite exhibited enhanced visible light property at room temperature. The formation of these porous hematite ellipsoids could be attributed to the vapor pressure induced oriented assembling of lots of α -Fe2O3 nanoparticles.

Show MeSH