Mechanochemically assisted synthesis of pristine Ca(II)Sn(IV)-layered double hydroxides and their amino acid intercalated nanocomposites
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Abstract
Syntheses of Ca(II)Sn(IV)-layered double hydroxides (LDHs) are attempted by the traditional co-precipitation as well as mechanochemical methods. Both the co-precipitation method and the one-step milling operation proved to be unsuccessful; these methods only produced physical mixtures of hydroxides and carbonates of the two metal ions. However, a two-step milling operation (dry milling followed by milling in the presence of minute amount of water) led to successful synthesis, verified by a range of characterisation methods. Surprisingly, it was found that ball-milling was not even necessary; the reaction proceeded on manual grinding of the components in an agate mortar with a pestle. The preparation of nanocomposites through intercalation of the anions of cystine or valine into Ca(II)Sn(IV)-LDH could also be achieved by the two-step milling method verified again by a range of instrumental methods.
Keywords
Milling Interlayer Spacing Layered Double Hydroxide CoCl2 6H2O Amino Acid AnionNotes
Acknowledgements
This research was financed by the OTKA NK106234 and the TÁMOP 4.2.2.A-11/1/KONV-2012-0047 Grants. M.(Á.)S. and M.Sz. gratefully acknowledge the support of TÁMOP 4.2.4.A/2-11-1-2012-0001 National Excellence Program. All these supports are highly appreciated.
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