Nanotechnology has been evolving in the past decades as an alternative to conventional fertilizers. Iron containing nanoparticles are important because of low cost and low toxicity. Ferrihydrite nanoparticles that model the available Fe pool of soils are often used to recover Fe deficiency of plants. Nevertheless, ferrihydrite aqueous suspensions are known to undergo slow transformation to a mixture of goethite and hematite.  Several nanocolloid suspensions differing in the surfactant type were prepared and fully characterized by transmission electron microscopy and <sup>57</sup>Fe Mössbauer spectroscopy before the plant treatment. To investigate the aging process of this material, spectra were measured at different times. The values obtained for the relative spectral area associated with the ferrihydrite made it possible to build up the time dependence of ferrihydrite concentration for all suspensions and to calculate the half life of the conversion.

Ferrihydrite/goethite/hematite nanoparticles: Transformation and utilization by the roots of <i>cucumis sativus</i>

ACS Fall 2021

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Ferrihydrite/goethite/hematite nanoparticles: Transformation and utilization by the roots of cucumis sativus