Inorganic Chemistry · 2013 · 31 citations · 19 references
Natural SciencesMaterials EngineeringMaterials ScienceInorganic ChemistryMaterials ChemistryNanomaterialsMetal Oxide NanomaterialsNanomaterial CharacterizationNanomaterials SynthesisNanoparticle CharacterizationNanoparticle DispersionsNanoparticle SynthesisIon NucleationMagnesium Oxide NanoparticlesMetal Oxide Nanoparticle SynthesisMetal Oxide Nanoparticles SynthesisMetal Oxide NanosheetsNanosheets
Colloidal layered double hydroxides (LDH) nanosheets were sorted by their lateral sizes using a density gradient ultracentrifuge separation technique. Composition investigations on these size-sorted nanosheets indicated that larger sheets had higher Mg:Al ratio than the smaller ones. Experiments using different Mg:Al feed ratios confirmed that high Mg:Al ratio induced fast sheet growth speed. Tracking the source of the Mg:Al spatial distribution difference in one batch of synthesis at the nucleation process revealed the coprecipitation-redissolution of Mg(2+). Thus the discriminative separation of these nanosheets led to a new insight into the structure-composition relationship of LDH nanomaterials and more understanding on their formation mechanism.
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