Macroscopic (adsorption isotherm and micro-calorimetry measurement) and microscopic (in situ X-ray diffraction and IR spectroscopy) approaches were used to study the influence of water adsorption on γ - Fe 2 O 3 nanoparticles. A nonmonotonic variation of γ-Fe 2 O 3 lattice parameter is revealed when the relative water pressure ( p / p 0 ) increases from 0.03 to 0.96 with a maximum deviation for p / p 0 ≈ 0.1. With IR spectroscopy, similar results were observed since a modification of γ-Fe 2 O 3 structural bands has been shown. In situ investigations as well as thermodynamics considerations lead to one important conclusion: the variation of the lattice parameter is in relation with the strains induced during the formation of water monolayer on the nanoparticles surface.
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Belin et al. (2004) studied this question.
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