Structural Characterization and Adsorption Properties of Pluronic F127 Onto Iron Oxides Magnetic Nanoparticles

2014 ◽  
Vol 14 (3) ◽  
pp. 2361-2367 ◽  
Author(s):  
Khalilalrahman Dehvari ◽  
Kuen-Song Lin ◽  
Steven S.-S. Wang
Keyword(s):  
Magnetic Nanoparticles ◽  
Iron Oxides ◽  
Structural Characterization ◽  
Adsorption Properties ◽  
Pluronic F127

Structural characterization using SAXS and rheological behaviors of pluronic F127 and methylcellulose blends

2020 ◽  
Author(s):  
Onpreeya Boonrat ◽  
Vimon Tantishaiyakul ◽  
Namon Hirun ◽  
Supagorn Rugmai ◽  
Siriwat Soontaranon
Keyword(s):  
Structural Characterization ◽  
Pluronic F127 ◽  
Rheological Behaviors

scholarly journals Impact of Gadolinium on the Structure and Magnetic Properties of Nanocrystalline Powders of Iron Oxides Produced by the Extraction-Pyrolytic Method

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4147
Author(s):  
Vera Serga ◽  
Regina Burve ◽  
Mikhail Maiorov ◽  
Aija Krumina ◽  
Ramūnas Skaudžius ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Thermal Treatment ◽  
Iron Oxides ◽  
Caproic Acid ◽  
Transformation Process ◽  
Nanocrystalline Powders ◽  
Preparation Conditions ◽  
Oxide Phases

Interest in magnetic nanoparticles is primarily due to their practical use. In this work, for the production of nanocrystalline powders of pure and gadolinium doped iron oxides, the extraction-pyrolytic method (EPM) was used. As a precursor, either iron-containing extract (iron (III) caproate in caproic acid) or its mixture with gadolinium-containing extract (gadolinium (III) valerate in valeric acid) was used. The mixed precursor contained 0.5 mol %, 2.5 mol %, 12.5 mol %, 50 mol %, and 75 mol % gadolinium in relation to the iron content. The formation of iron oxide phases, depending on the preparation conditions, was investigated. According to the results obtained, it was demonstrated that the presence of more than 2.5 mol % gadolinium additive in the mixed precursor inhibits the magnetite-to-hematite transformation process during thermal treatment. Produced samples were characterized by XRD and SEM methods, and the magnetic properties were studied.

Mechanochemical Formulation of Coating Iron Oxides Magnetic Nanoparticles with Humics

2012 ◽  
Vol 317-318 (1) ◽  
pp. 169-174 ◽  
Author(s):  
Anna Yurishcheva ◽  
Gulzhian I. Dzhardimalieva ◽  
Svetlana Pomogailo ◽  
Anatoly D. Pomogailo ◽  
Sharipa Jorobekova ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Iron Oxides

Aqueous chemical synthesis of iron oxides magnetic nanoparticles of different morphology and mesostructure

2021 ◽  
Author(s):  
O.A. Shilova ◽  
A.M. Nikolaev ◽  
A.S. Kovalenko ◽  
A.A. Sinel'nikov ◽  
KhE. Yorov ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Chemical Synthesis ◽  
Iron Oxides

scholarly journals Local and long-range atomic/magnetic structure of non-stoichiometric spinel iron oxide nanocrystallites

IUCrJ ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 33-45
Author(s):  
Henrik L. Andersen ◽  
Benjamin A. Frandsen ◽  
Haraldur P. Gunnlaugsson ◽  
Mads R. V. Jørgensen ◽  
Simon J. L. Billinge ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Iron Oxide Nanoparticles ◽  
Structural Characterization ◽  
Magnetic Domain ◽  
Scattering Data ◽  
Oxide Nanoparticles ◽  
Total Scattering ◽  
X Ray ◽  
Neutron Total Scattering

Spinel iron oxide nanoparticles of different mean sizes in the range 10–25 nm have been prepared by surfactant-free up-scalable near- and super-critical hydrothermal synthesis pathways and characterized using a wide range of advanced structural characterization methods to provide a highly detailed structural description. The atomic structure is examined by combined Rietveld analysis of synchrotron powder X-ray diffraction (PXRD) data and time-of-flight neutron powder-diffraction (NPD) data. The local atomic ordering is further analysed by pair distribution function (PDF) analysis of both X-ray and neutron total-scattering data. It is observed that a non-stoichiometric structural model based on a tetragonal γ-Fe2O3 phase with vacancy ordering in the structure (space group P43212) yields the best fit to the PXRD and total-scattering data. Detailed peak-profile analysis reveals a shorter coherence length for the superstructure, which may be attributed to the vacancy-ordered domains being smaller than the size of the crystallites and/or the presence of anti-phase boundaries, faulting or other disorder effects. The intermediate stoichiometry between that of γ-Fe2O3 and Fe3O4 is confirmed by refinement of the Fe/O stoichiometry in the scattering data and quantitative analysis of Mössbauer spectra. The structural characterization is complemented by nano/micro-structural analysis using transmission electron microscopy (TEM), elemental mapping using scanning TEM, energy-dispersive X-ray spectroscopy and the measurement of macroscopic magnetic properties using vibrating sample magnetometry. Notably, no evidence is found of a Fe3O4/γ-Fe2O3 core-shell nanostructure being present, which had previously been suggested for non-stoichiometric spinel iron oxide nanoparticles. Finally, the study is concluded using the magnetic PDF (mPDF) method to model the neutron total-scattering data and determine the local magnetic ordering and magnetic domain sizes in the iron oxide nanoparticles. The mPDF data analysis reveals ferrimagnetic collinear ordering of the spins in the structure and the magnetic domain sizes to be ∼60–70% of the total nanoparticle sizes. The present study is the first in which mPDF analysis has been applied to magnetic nanoparticles, establishing a successful precedent for future studies of magnetic nanoparticles using this technique.

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