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Engineered morphologies of layered double hydroxide nanoarchitectured shell microspheres and their calcined products
- Source :
-
Chemical Engineering Science . May2011, Vol. 66 Issue 10, p2157-2163. 7p. - Publication Year :
- 2011
-
Abstract
- Abstract: CoFeIIFeIII-layered double hydroxide (LDH) hollow spheres with two distinctly different hierarchical morphologies—flower-like and raspberry-like, involving edge-on and face-on oriented LDH platelets as building blocks, respectively—can be fabricated by tuning the rate of addition of NaOH solution in a coprecipitation process with sulfonated polystyrene spheres as a template. Ex situ pH-dependent microscopic observations of the formation of the flower-like LDH shells shows the details of non-classic nucleation and growth underlying the edge-on orientation. After calcination, the resulting CoFe2O4 materials retain the hierarchical morphology of the corresponding LDH precursor. The hollow CoFe2O4 spheres with raspberry-like morphology exhibit magnetic properties comparable to a reference material obtained by calcination of a conventional LDH powder precursor. Similar materials with tunable magnetic properties can be prepared by virtue of the flexibility in LDH layer composition. The CoFeIIFeIII-LDH spheres with a raspberry-like morphology may be also be prepared by using a scalable procedure involving separate ultra-rapid nucleation and aging steps in a modified colloid mill reactor. The results reported here may open up the possibility of producing shell structures with controllable morphologies and properties on a large scale. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00092509
- Volume :
- 66
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Science
- Publication Type :
- Academic Journal
- Accession number :
- 59775408
- Full Text :
- https://doi.org/10.1016/j.ces.2011.02.024