The effect of poly vinyl alcohol (PVA) surfactant on phase formation and magnetic properties of hydrothermally synthesized CoFe2O4 nanoparticles

Jalalian, M.; Mirkazemi, S. M.; Alamolhoda, S.

doi:10.1016/j.jmmm.2016.06.045

Cited by 26 publications

(11 citation statements)

References 35 publications

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“…The large NiFe 2 O 4 is due to the scattering in direction of anisotropy field due to inhomogeneous broadening, at high temperature, it has the tendency to make magnetic moment isotropic causes the decrease of H C value [21]. The M S value of 31.9 emu/g found for NiFe 2 O 4 (particle size of ~8.2 nm) is close to the values of 34.5 emu/g for NiFe 2 O 4 NPs (crystallite size of ~68 nm) obtained by egg-white solution route, but lower than the theoretical M S of 50 emu/g calculated using Neel's sublattice theory and the reported value of 56 emu/g for the bulk sample [96]. The M S value of 55.3 emu/g obtained in the CoFe 2 O 4 (diameter of ~8.5 nm) is lower than values of 80 emu/g for bulk CoFe 2 O 4 and ~65 emu/g for the CoFe 2 O 4 NPs with crystallite size of ~40 nm synthetized by aerosol route, and higher than the values of 30 emu/g for hydrothermal-synthesized CoFe 2 O 4 NPs (diameter of ~30 nm).…”

Section: Magnetic Applicationssupporting

confidence: 80%

Characterization and Applications of Metal Ferrite Nanocomposites

2022

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Section: Magnetic Applicationssupporting

confidence: 80%

Characterization and Applications of Metal Ferrite Nanocomposites

2022

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“…The obtained precipitate is washed, separated by centrifugation, and annealed around 500 • C to eliminate the carbon-based template [95]. In order to control the crystal structure, particle size, and morphology, surfactants are often employed in solution process [96]. Ethylenediamine and citric acid may also be used in the synthesis.…”

Section: Hydrothermal Methodsmentioning

confidence: 99%

Recent Advances in Synthesis and Applications of MFe2O4 (M = Co, Cu, Mn, Ni, Zn) Nanoparticles

2021

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In the last decade, research on the synthesis and characterization of nanosized ferrites has highly increased and a wide range of new applications for these materials have been identified. The ability to tailor the structure, chemical, optical, magnetic, and electrical properties of ferrites by selecting the synthesis parameters further enhanced their widespread use. The paper reviews the synthesis methods and applications of MFe2O4 (M = Co, Cu, Mn, Ni, Zn) nanoparticles, with emphasis on the advantages and disadvantages of each synthesis route and main applications. Along with the conventional methods like sol-gel, thermal decomposition, combustion, co-precipitation, hydrothermal, and solid-state synthesis, several unconventional methods, like sonochemical, microwave assisted combustion, spray pyrolysis, spray drying, laser pyrolysis, microemulsion, reverse micelle, and biosynthesis, are also presented. MFe2O4 (M = Co, Cu, Mn, Ni, Zn) nanosized ferrites present good magnetic (high coercivity, high anisotropy, high Curie temperature, moderate saturation magnetization), electrical (high electrical resistance, low eddy current losses), mechanical (significant mechanical hardness), and chemical (chemical stability, rich redox chemistry) properties that make them suitable for potential applications in the field of magnetic and dielectric materials, photoluminescence, catalysis, photocatalysis, water decontamination, pigments, corrosion protection, sensors, antimicrobial agents, and biomedicine.

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“…However, it was also observed that reprecipitation of TIPS-Pn into dilute aqueous poly(vinyl alcohol) (PVA) solutions induced an identical effect, and an additional study has since reported modulation of pyrene NP morphology using a similar method . PVA is a common additive in the preparation of both organic − ,− and inorganic − NP dispersions, although the rationale for its use is often unclear. Some authors have noted that inclusion of PVA appears to stabilize NP dispersions through binding to the surface and acting as a capping agent, , while others have also suggested that it influences the nucleation stage through controlling factors such as viscosity and surface tension .…”

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Organizing Crystalline Functionalized Pentacene Using Periodicity of Poly(Vinyl Alcohol)

Hudson

Perrelle

Pensack

et al. 2019

J. Phys. Chem. Lett.

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Nanoparticles of acenes exhibit highly efficient intermolecular singlet fission (SF). Recent reports indicate that altering the morphology of 6,13-bis-(triisopropylsilylethynyl)pentacene (TIPS-Pn) nanoparticles has a profound influence on their SF dynamics. Here, we show that poly(vinyl alcohol) (PVA) induces a phase transition in preformed TIPS-Pn nanoparticles. These nanoparticles are amorphous when initially formed but crystalline after addition of PVA. Surface characterization indicates that a diffuse PVA layer surrounds the nanoparticles. We propose that a periodic interaction between the hydroxyl groups of PVA and TIPS groups of TIPS-Pn on the nanoparticle surface induces a large-scale structural rearrangement to yield crystalline TIPS-Pn. Such reorganization in preformed organic nanoparticles is unprecedented, and we believe that this is the first report of such an effect induced by polymer adsorption. Transient absorption spectroscopic results reveal that SF within these nanoparticles is accelerated by an order of magnitude upon structural rearrangement.

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The effect of poly vinyl alcohol (PVA) surfactant on phase formation and magnetic properties of hydrothermally synthesized CoFe2O4 nanoparticles

Cited by 26 publications

References 35 publications

Characterization and Applications of Metal Ferrite Nanocomposites

Characterization and Applications of Metal Ferrite Nanocomposites

Recent Advances in Synthesis and Applications of MFe2O4 (M = Co, Cu, Mn, Ni, Zn) Nanoparticles

Organizing Crystalline Functionalized Pentacene Using Periodicity of Poly(Vinyl Alcohol)

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