Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1048, Issue -, Pages 18-26Publisher
ELSEVIER
DOI: 10.1016/j.molstruc.2013.05.026
Keywords
Magnetite; Iron oxide nanoparticles; Surfactant; Molecular dynamics simulations
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Funding
- DST/Mintek Nanotechnology Innovation Centre (NIC) of South Africa
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By using molecular dynamics in canonical ensemble (constant atom number, volume and temperature (NVT)) the adsorption of Sebacic Acid (SA) and 1,10-Decanediol (DD) respectively onto the surfaces of an iron-oxide nanoparticle is simulated. The nanoparticle is built by taking into account the inverse spinel structure of a stoichiometric magnetite and the valence of the iron ions (FeA2+FeB2+FB2+ where A and B stand for tetrahedral and octahedral sites, respectively). This study serves to determine theoretically whether surfactants like SA or DD acts as a better stabilising agent for iron oxide nanoparticles of diameters >= 2.6 nm. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) measurements on iron oxide nanoparticles stabilised with SA- and DD surfactants were obtained and compared to the simulated results. Unagglomerated nanoparticles with well-defined edges were observed during TEM for DD stabilised particles and a smaller particle size could be calculated for these nanoparticles from XRD patterns. It is concluded that DD stabilises an iron-oxide nanoparticle better than SA because of the difference in the number of oxygen atoms on the respective functional groups. (c) 2013 Elsevier B.V. All rights reserved.
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