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Issue 41, 2011
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Iron oxyhydroxide nanoparticles formed by forced hydrolysis: dependence of phase composition on solution concentration

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Abstract

Nanoparticles of single-phase lepidocrocite (γ-FeOOH) and goethite (α-FeOOH) have been synthesized by forced hydrolysis of ferric nitrate with no other additives, and the particles have been characterized by XRD, FT-IR and TEM. At low Fe(NO3)3 concentrations the hydrolysis product is predominantly γ-FeOOH, while at high concentrations it is α-FeOOH. These particles are nanometers in size and fall within narrow particle size distributions. The dependence of the oxyhydoxide phase on ferric nitrate concentration is attributed to two thermodynamic factors, the enthalpy of formation and the surface enthalpy of hydration at the oxide-water interface (which is a function of surface area). Two potential mechanisms for the phase-specific growth are proposed that explain the solution concentration dependence of the phase formed. Three other common nanoscale particles (α-Fe2O3, Fe3O4 and γ-Fe2O3) have also been prepared by relatively simple thermal/chemical treatment of the γ-FeOOH nanoparticles.

Graphical abstract: Iron oxyhydroxide nanoparticles formed by forced hydrolysis: dependence of phase composition on solution concentration

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Publication details

The article was received on 21 Jan 2011, accepted on 22 Aug 2011 and first published on 22 Sep 2011


Article type: Paper
DOI: 10.1039/C1CP20188C
Citation: Phys. Chem. Chem. Phys., 2011,13, 18523-18529
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    Iron oxyhydroxide nanoparticles formed by forced hydrolysis: dependence of phase composition on solution concentration

    D. Fu, P. G. Keech, X. Sun and J. C. Wren, Phys. Chem. Chem. Phys., 2011, 13, 18523
    DOI: 10.1039/C1CP20188C

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