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Size-Controlled Synthesis of MgO Nanoparticles and the Assessment of Their Bactericidal Capacity

Published online by Cambridge University Press:  20 May 2013

Yarilyn Cedeño-Mattei ,
Myrna Reyes ,
Oscar Perales-Pérez  and
Félix R. Román
Yarilyn Cedeño-Mattei
Affiliation:
Department of Chemistry, University of Puerto Rico, Mayaguez, PR 00681-9000, U.S.A. Department of Engineering Science and Materials, University of Puerto Rico, Mayaguez, PR 00681-9000, U.S.A.
Myrna Reyes
Affiliation:
Department of Chemistry, University of Puerto Rico, Mayaguez, PR 00681-9000, U.S.A.
Oscar Perales-Pérez
Affiliation:
Department of Chemistry, University of Puerto Rico, Mayaguez, PR 00681-9000, U.S.A. Department of Engineering Science and Materials, University of Puerto Rico, Mayaguez, PR 00681-9000, U.S.A.
Félix R. Román
Affiliation:
Department of Chemistry, University of Puerto Rico, Mayaguez, PR 00681-9000, U.S.A.
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Abstract

The present work focuses on the development of a reproducible and cost-effective size-controlled synthesis route for nanoscale MgO and the preliminary assessment of its bactericide capacity as a function of crystal size. Nanoscale MgO was produced through the thermal decomposition of Mg-carbonate hydrate precursor (hydromagnesite) synthesized in aqueous phase. The exclusive formation of the MgO phase, with an average crystallite size between 7 and 13 ± 1 nm, was evidenced by X-Ray Diffraction and HRTEM analyses. Fourier Transform – Infrared spectroscopy confirmed the evolution of the precursor into the desired MgO structure. The bactericidal tests were conducted by measuring the optical density at 600 nm of E. coli in presence of MgO nanoparticles of specific sizes. MgO nanocrystals with average crystallite sizes of 13nm inhibited bacterial growth up to 35% at 500 mg MgO/L. The mechanism of inhibition could be attributed to the formation of superoxide species on the MgO surface.

Keywords

nucleation & growthnanoscalex-ray diffraction (XRD)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1547: Symposium M – Solution Synthesis of Inorganic Functional Materials—Films, Nanoparticles and Nanocomposites , 2013 , pp. 135 - 140
Copyright
Copyright © Materials Research Society 2013 

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References

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