Preparation and properties of nanosize MnZn ferrite from δ-FeOOH

Hao, Shunli; Wang, Xin; Yu, Weiren; Wang, Yongming; Liu, Chunjing

doi:10.1016/s1001-0521(07)60127-2

Cited by 6 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, feroxyhyte possesses a layered structure, a high specific surface area and pronounced adsorption properties. 20 This compound is used as a sorbent for removal of toxic ions from wastewater, 21,22 a precursor for high coercivity materials, 23,24 and as a photocatalyst for water splitting. 25 Feroxyhyte also is a participant of complex processes of organic-inorganic interactions in biogeochemical systems.…”

Section: Introductionmentioning

confidence: 99%

Constrained growth of anisotropic magnetic δ-FeOOH nanoparticles in the presence of humic substances

et al. 2012

View full text Add to dashboard Cite

Natural polyelectrolytes, humic substances, are suggested to control in situ growth of feroxyhyte nanoparticles of a highly reduced mean size and with enhanced colloidal stability in salt solutions. The feroxyhyte is formed as 2-5 nm thick and 20 6 20 nm wide nanoflakes due to the blocking of developing facets of feroxyhyte and constraints caused by diffusion limitations of ionic constituents across partially charged branches of humic substances. ExperimentalHigh-purity FeCl 2 ?4H 2 O was purchased from ABCR GmbH&Co (Germany). Potassium humate was purchased from ''Sakhalinsky Humates'' (groups of companies, Russia). According to manufacturer's information, potassium humate was produced by alkaline extraction from leonardite.

show abstract

Section: Introductionmentioning

confidence: 99%

Constrained growth of anisotropic magnetic δ-FeOOH nanoparticles in the presence of humic substances

et al. 2012

View full text Add to dashboard Cite

show abstract

“…The nano-Mn 0.4 Zn 0.6 Fe 2 O 4 was prepared according to the method of Hao et al [11]. The nano-Mn 0.4 Zn 0.6 Fe 2 O 4 was then dried at 708C to obtain samples with a pink color.…”

Section: Methodsmentioning

confidence: 99%

Synergistic effects of nano‐Mn_0.4Zn_0.6Fe₂O₄ on intumescent flame‐retarded polypropylene

Wang

Song

Bao

2008

Vinyl Additive Technology

View full text Add to dashboard Cite

The melamine salt of 5,5‐dimethyl‐1,3,2‐dioxaphos‐phorinane‐2‐oxide‐2‐hydroxide (IFR100) was used as an intumescent flame retardant in flame‐retarded polypropylene (PP). As a synergistic agent, nano‐Mn0.4Zn0.6Fe2O4 was incorporated into the PP/IFR100 composite at different proportions. The synergistic effects of nano‐Mn0.4Zn0.6Fe2O4 were studied by the limiting oxygen index (LOI) test, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X‐ray diffraction (XRD). The synergistic effect of the nano‐Mn0.4Zn0.6Fe2O4 additive with IFR100 was clearly observed by LOI. The TGA results showed that nano‐Mn0.4Zn0.6Fe2O4 improved the thermal stability of the PP/IFR100 system above 400°C. On the basis of the FTIR and XRD results, it was evident that nano‐Mn0.4Zn0.6Fe2O4 efficiently promoted the formation of a charred layer containing phosphocarbonaceous structures. The SEM micrographs indicated that nano‐Mn0.4Zn0.6Fe2O4 strengthened the structure of the char layer remaining after combustion. J. VINYL ADDIT. TECHNOL., 2008. © 2008 Society of Plastics Engineers

show abstract

“…This route has also been adopted by Sourty et al, 3 but it was originally based on a mechanism of dissolution and recrystallization of g-FeOOH (lepidocrocite) into magnetite reported by Tamura et al 28 A similar transformation from the precursor d-FeOOH into MnZn ferrite has been studied by Hao et al 29 In the repeated cycles (nX2), a certain quantity of Fe 2 þ ions should be oxidized into Fe 3 þ by trace amounts of oxygen that inevitably remains in the aqueous solvent after the first oxidation step. Therefore, the formation of Fe 3 O 4 nanoparticles in smaller sizes throughout the co-precipitation process according to Equation (3) may also be admitted as a concurrent route during the present in situ method.…”

Section: Magnetismmentioning

confidence: 99%

Nanoincorporation of iron oxides into carrageenan gels and magnetometric and morphological characterizations of the composite products

Oya

Tsuru

Teramoto

et al. 2012

Polym J

View full text Add to dashboard Cite

Carrageenan-based magnetic composites were prepared via in situ synthesis of iron oxides in a gelatinous network of the polysaccharide. The repeatable synthesis process involved three steps: immersion into ferrous salt (FeCl 2) solution, alkali treatment in sodium hydroxide solution and oxidation with hydrogen peroxide, successively performed with s-or j-carrageenan hydrogels as the starting material. Field emission scanning electron microscope observations, X-ray diffractometry and superconducting quantum interference device (SQUID) magnetometry were carried out for the freeze-dried composites. Feroxyhite and magnetite and/or maghemite particles were produced after one cycle and multicycles of the in situ process, respectively, with a size less than several tens of nanometers, and were distributed throughout the inside as well as on the surface of numerous fibrillar entities constituting the carrageenan matrix. Nearly all the composite products explored displayed a superparamagnetic (SPM) property at 298 K; the estimated saturation magnetization (M s) increased with increasing concentrations of FeCl 2 in the gel immersion step and with repetition of the standardized process of iron oxide synthesis. By repeating the synthesis cycle 3-4 times, a composite of practically high M s reaching B25 emu (g sample) À1 was easily obtained without impairing the SPM character. Insight was provided into the evolution mechanism of the oxidation state and dimensional distribution of the cyclically loaded iron oxide nanoparticles through comparison with another composite series obtained by a co-precipitation method with a 1:2 mixture of ferrous/ferric salts.

show abstract

Preparation and properties of nanosize MnZn ferrite from δ-FeOOH

Cited by 6 publications

References 6 publications

Constrained growth of anisotropic magnetic δ-FeOOH nanoparticles in the presence of humic substances

Constrained growth of anisotropic magnetic δ-FeOOH nanoparticles in the presence of humic substances

Synergistic effects of nano‐Mn_0.4Zn_0.6Fe₂O₄ on intumescent flame‐retarded polypropylene

Nanoincorporation of iron oxides into carrageenan gels and magnetometric and morphological characterizations of the composite products

Contact Info

Product

Resources

About

Preparation and properties of nanosize MnZn ferrite from δ-FeOOH

Cited by 6 publications

References 6 publications

Constrained growth of anisotropic magnetic δ-FeOOH nanoparticles in the presence of humic substances

Constrained growth of anisotropic magnetic δ-FeOOH nanoparticles in the presence of humic substances

Synergistic effects of nano‐Mn0.4Zn0.6Fe2O4 on intumescent flame‐retarded polypropylene

Nanoincorporation of iron oxides into carrageenan gels and magnetometric and morphological characterizations of the composite products

Contact Info

Product

Resources

About

Synergistic effects of nano‐Mn_0.4Zn_0.6Fe₂O₄ on intumescent flame‐retarded polypropylene