Comparing Highly Ordered Monolayers of Nanoparticles Fabricated Using Electrophoretic Deposition: Cobalt Ferrite Nanoparticles versus Iron Oxide Nanoparticles

2015 ◽  
Vol 162 (11) ◽  
pp. D3036-D3039 ◽  
Author(s):  
Alex J. Krejci ◽  
Adriana-Mendoza Garcia ◽  
Viet Hung Pham ◽  
Shouheng Sun ◽  
James H. Dickerson
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Electrophoretic Deposition ◽  
Cobalt Ferrite ◽  
Ferrite Nanoparticles ◽  
Oxide Nanoparticles ◽  
Cobalt Ferrite Nanoparticles

Electrophoretic Deposition of Nanoparticles as Electrocatalysts for Electrolysis in the Solar Sulfur Ammonia Hydrogen Production

2015 ◽  
Vol 654 ◽  
pp. 76-82
Author(s):  
Nicole S. Pacheco ◽  
Neil Verma ◽  
Komail Haider ◽  
Jan B. Talbot
Keyword(s):  
Hydrogen Production ◽  
Ammonium Sulfate ◽  
Electrophoretic Deposition ◽  
Electrocatalytic Activity ◽  
Cobalt Ferrite ◽  
Ferrite Nanoparticles ◽  
Thermochemical Cycle ◽  
Cobalt Ferrite Nanoparticles ◽  
Ammonium Sulfite

Cobalt ferrite nanoparticles were deposited using electrophoretic deposition from two different bath chemistries, 90 vol.% water and 10 vol.% isopropanol with hexadecyltrimethlyammonium bromide (CTAB) and 100 % ethanol. The deposits were tested for electrocatalytic activity for the oxidation of ammonium sulfite to ammonium sulfate as part of a solar sulfur ammonia thermochemical cycle to produce hydrogen.

scholarly journals Biocompatible Magnetic Fluids of Co-Doped Iron Oxide Nanoparticles with Tunable Magnetic Properties

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1019 ◽  
Author(s):  
Silvio Dutz ◽  
Norbert Buske ◽  
Joachim Landers ◽  
Christine Gräfe ◽  
Heiko Wende ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Pure Iron ◽  
Cobalt Ferrite ◽  
Oxide Nanoparticles ◽  
Iron Oxide Particles ◽  
Heating Performance ◽  
Co Doped ◽  
Pure Iron Oxide

Magnetite (Fe3O4) particles with a diameter around 10 nm have a very low coercivity (Hc) and relative remnant magnetization (Mr/Ms), which is unfavorable for magnetic fluid hyperthermia. In contrast, cobalt ferrite (CoFe2O4) particles of the same size have a very high Hc and Mr/Ms, which is magnetically too hard to obtain suitable specific heating power (SHP) in hyperthermia. For the optimization of the magnetic properties, the Fe2+ ions of magnetite were substituted by Co2+ step by step, which results in a Co doped iron oxide inverse spinel with an adjustable Fe2+ substitution degree in the full range of pure iron oxide up to pure cobalt ferrite. The obtained magnetic nanoparticles were characterized regarding their structural and magnetic properties as well as their cell toxicity. The pure iron oxide particles showed an average size of 8 nm, which increased up to 12 nm for the cobalt ferrite. For ferrofluids containing the prepared particles, only a limited dependence of Hc and Mr/Ms on the Co content in the particles was found, which confirms a stable dispersion of the particles within the ferrofluid. For dry particles, a strong correlation between the Co content and the resulting Hc and Mr/Ms was detected. For small substitution degrees, only a slight increase in Hc was found for the increasing Co content, whereas for a substitution of more than 10% of the Fe atoms by Co, a strong linear increase in Hc and Mr/Ms was obtained. Mössbauer spectroscopy revealed predominantly Fe3+ in all samples, while also verifying an ordered magnetic structure with a low to moderate surface spin canting. Relative spectral areas of Mössbauer subspectra indicated a mainly random distribution of Co2+ ions rather than the more pronounced octahedral site-preference of bulk CoFe2O4. Cell vitality studies confirmed no increased toxicity of the Co-doped iron oxide nanoparticles compared to the pure iron oxide ones. Magnetic heating performance was confirmed to be a function of coercivity as well. The here presented non-toxic magnetic nanoparticle system enables the tuning of the magnetic properties of the particles without a remarkable change in particles size. The found heating performance is suitable for magnetic hyperthermia application.

Synthesis and Characterization of Magnetic Iron Oxide Nanoparticles

2004 ◽  
Vol 853 ◽  
Author(s):  
Lingyan Wang ◽  
Jin Luo ◽  
Mathew M. Maye ◽  
Quan Fan ◽  
Qiang Rendeng ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Iron Pentacarbonyl ◽  
Ferrite Nanoparticles ◽  
Oxide Nanoparticles ◽  
Particle Sizes ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Trimethylamine Oxide ◽  
Organometallic Precursors

ABSTRACTThis paper describes the results of an investigation of modified synthetic protocols to produce monodispersed magnetic ferrite nanoparticles, γ-Fe2O3 and Fe3O4, and their magnetic properties. The synthesis involved thermal decomposition of organometallic precursors followed by oxidation or reduction. In the synthesis of γ-Fe2O3, iron pentacarbonyl was used as the precursor and trimethylamine oxide as the oxidant. In the synthesis of Fe3O4, iron (III) acetylacetonate was reduced by 1, 2-hexadecanediol. The particle sizes ranged from 5–15 nm with high monodispersity. Results from TEM, XPS, and SQUID characterizations of these iron oxide nanoparticles are discussed.

scholarly journals Structure, Composition and Magnetic Properties of Ferrofluid Nanoparticles after Separation / Feromagnētisko Šķidrumu Nanodaļiņu Struktūras, Sastāva un Magnētisko Īpašību Izmaiņas Pēc Separācijas

2013 ◽  
Vol 50 (4) ◽  
pp. 56-61
Author(s):  
G. Kronkalns ◽  
M. Kodols ◽  
M.M. Maiorov
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Size Distribution ◽  
Iron Oxide Nanoparticles ◽  
Ferrite Nanoparticles ◽  
Nanoparticle Size ◽  
Oxide Nanoparticles ◽  
Narrow Size Distribution ◽  
Chemical Coprecipitation ◽  
Chemical Coprecipitation Method

Abstract The structure, composition and magnetic properties of iron oxide nanoparticles are studied as dependent on the synthesis technology and method of separation in ferrofluids. The goal of the present study is to improve the magnetic properties of wet-synthesized nanoparticles and achieve a narrow nanoparticle size distribution. The results of measurements show that by varying the conditions of the chemical coprecipitation method, different compositions and structures of the nanoparticles could be obtained. The separation of ferrite nanoparticles of a polydisperse colloid by centrifugation as well as by HGMS provides the possibility to obtain a nanoparticle set with narrow size distribution

Enhanced hyperthermic properties of biocompatible zinc ferrite nanoparticles with a charged polysaccharide coating

2019 ◽  
Vol 7 (18) ◽  
pp. 2962-2973 ◽  
Author(s):  
Dorota Lachowicz ◽  
Weronika Górka ◽  
Angelika Kmita ◽  
Andrzej Bernasik ◽  
Jan Żukrowski ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Zinc Ferrite ◽  
Superparamagnetic Iron Oxide ◽  
Magnetic Hyperthermia ◽  
Ferrite Nanoparticles ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Zinc Doping

Zinc doping of superparamagnetic iron oxide nanoparticles coated with an ionic derivative of chitosan significantly improves their properties for magnetic hyperthermia.

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