Thermodynamic Properties of α-Fe2O3 and Fe3O4 Nanoparticles

Spencer, Elinor C.; Ross, Nancy L.; Olsen, Rebecca E.; Huang, Baiyu; Kolesnikov, Alexander I.; Woodfield, Brian F.

doi:10.1021/acs.jpcc.5b01481

Thermodynamic Properties of α-Fe₂O₃ and Fe₃O₄ Nanoparticles

Journal Article · Tue Apr 21 00:00:00 EDT 2015 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.5b01481· OSTI ID:1265482

Spencer, Elinor C. ^[1]; Ross, Nancy L. ^[1]; Olsen, Rebecca E. ^[2]; Huang, Baiyu ^[2]; Kolesnikov, Alexander I. ^[3]; Woodfield, Brian F. ^[2]

Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). Dept. of Geosciences
Brigham Young Univ., Provo, UT (United States). Dept. of Chemistry and Biochemistry
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division

Here we comprehansively assessed the thermodynamic properties of hydrated α-Fe₂O₃ (hematite) and Fe₃O₄ (magnetite) nanoparticles. In addition to 9 nm Fe₃O₄, three α-e₂O₃nanoparticles samples of different sizes (11, 14, and 25 nm) and bulk α-e₂O₃ have been evaluated by inelastic neutron scattering methods. The contribution of the two-level magnetic spin flip transition to the heat capacity of the α-e₂O₃ particles has been determined. The isochoric heat capacity of the water confined on the surface of these two types of iron oxide particles have been calculated from their INS spectra, and is affected by the chemical composition of the underlying particle. Furthermore, the heat capacity and dynamics of the particle hydration layers appear to be influenced by a complex array of factors including particle size, water coverage, and possibly the magnetic state of the particle itself.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1265482

Journal Information:: Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 17 Vol. 119; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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The Influence of Synthesis Parameters on Structural and Magnetic Properties of Iron Oxide Nanomaterials Cursaru, Laura-Madalina; Piticescu, Roxana Mioara; Dragut, Dumitru Valentin Preprints.org https://doi.org/10.20944/preprints201912.0036.v1	posted_content	December 2019
The Influence of Synthesis Parameters on Structural and Magnetic Properties of Iron Oxide Nanomaterials Cursaru, Laura Madalina; Piticescu, Roxana Mioara; Dragut, Dumitru Valentin Nanomaterials, Vol. 10, Issue 1 https://doi.org/10.3390/nano10010085	journal	January 2020

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