Magnetic iron oxide nanopowders produced by CO2 laser evaporation

Kurland, Heinz-Dieter; Grabow, Janet; Staupendahl, G.; Andrä, W.; Dutz, Silvio; Bellemann, Matthias E.

doi:10.1016/j.jmmm.2006.10.1166

Cited by 42 publications

(28 citation statements)

References 8 publications

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“…Iron oxide magnetic nanoparticles (MNPs) were synthesized by the laser target evaporation (LTE)-the highly productive method of physical dispersion based on the evaporation of a solid pellet by laser beam with consequent condensation of vapors in the gas phase [13,14]. Special advantages of this technique are the big size of the single batch and spherical shape of the MNPs [15,16].…”

Section: Methodsmentioning

confidence: 99%

Magnetoimpedance Effect in CoFeMoSiB As-Quenched and Surface Modified Amorphous Ribbons in the Presence of Igon Oxide Nanoparticles of Water-Based Ferrofluid

et al. 2017

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Giant magnetoimpedance (GMI) has been proposed as a powerful technique for biosensing. In GMI biosensors based on the magnetic label detection the change of the impedance of sensitive element under the application of an external magnetic field was analyzed in the presence of magnetic nanoparticles in a test solution. Amorphous ribbon-based GMI biodetectors have an advantage of low operation frequency and low cost. In this work, magnetic and GMI properties of amorphous Co 68.6 Fe 3.9 Mo 3.0 Si 12.0 B 12.5 ribbons were studied in as-quenched and surface modified states both without and in the presence of maghemite ferrofluid. After the surface modification the coercivity was slightly increased and saturation magnetization decreased in good agreement with increase of the surface roughness, a decrease of magnetic elements concentrations in the surface layer, and formation of a surface protective oxide layer. The GMI difference for as-quenched ribbons in absence and in the presence of ferrofluid was measurable for the frequency range of 2 to 10 MHz and the current intensities of 1 to 20 mA. Although the proposed surface modification by the ultrasound treatment did not improve the sensitivity limit for ferrofluid detection, it did not decrease it either.

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Section: Methodsmentioning

confidence: 99%

Magnetoimpedance Effect in CoFeMoSiB As-Quenched and Surface Modified Amorphous Ribbons in the Presence of Igon Oxide Nanoparticles of Water-Based Ferrofluid

et al. 2017

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“…In this experiment, hematite (Aldrich; purity 499%, particle sizes o5 mm) was laser-evaporated with pulsed radiation (1 ms pulse length, 200 Hz repetition frequency, 2 kW peak power, and 710 W mean power) under air (flow rate 12.5 m 3 /h) at normal pressure. In order to minimize the hematite content in the produced powder, an additional anoxic gas jet (nitrogen, flow rate 2 m 3 /h) was led through the zone of evaporation and nucleation in order to reduce the oxygen concentration in this area, leading to a preferential nucleation of maghemite [7].…”

Section: Article In Pressmentioning

confidence: 99%

“…A highly versatile and potent method for the production of a multiplicity of nanopowders is the laser evaporation technique [2][3][4][5]. Basic investigations [6,7] revealed that this technique is well suited for the production of magnetic iron oxide (Fe x O y ) nanoparticles. We will introduce two optional methods, which allow for the conditioning and tailoring of the laser-generated nanopowders particularly with regard to their magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

“…In transmission electron (TE) micrographs of the lasergenerated magnetic Fe x O y nanopowders, particles ordered in long (several hundreds of nanometers) chain-like structures were frequently observed [7]. Provided that these structures can be stabilized, it is expected that they would exhibit a magnetic behavior similar to needle-shaped particles with a high coercivity (H C ) and remanence due to the high shape anisotropy.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic iron oxide nanopowders produced by CO2 laser evaporation—‘In situ’ coating and particle embedding in a ceramic matrix

Kurland

Grabow

Staupendahl

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…The fabrication techniques providing enhanced batch sizes [4,5] attract special attention as the properties of MNPs can vary from batch to batch. One of the methods of MNPs synthesis providing a high production rate is the physical method of the laser target evaporation (LTE) [6][7][8][9]: it provides 10 to 50 nm spherical MNPs at ca. 100 g per hour production rate.…”

Section: Introductionmentioning

confidence: 99%

Interaction of iron oxide nanoparticles synthesized by laser target evaporation with polyacrylamide in composites and ferrogels

2017

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Iron oxide magnetic nanoparticles (MNPs) with average diameter 11.7 nm synthesized by laser target evaporation were used for the synthesis of composites and ferrogels based on polyacrylamide network. The chemical composition of MNPs corresponded to maghemite. It was shown that intact MNPs strongly interacted with polyacrylamide polymeric network, while the adsorption of electrostatic stabilizer on the surface of MNPs efficiently prevents such interaction. Synthesis of ferrogels was performed by the radical polymerization of acrylamide in electrostatically stabilized suspensions of MNPs in water. It was shown that the molecular structure, water uptake, and compression modulus can be controlled by the concentration of monomer taken in the synthesis.

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Magnetic iron oxide nanopowders produced by CO2 laser evaporation

Cited by 42 publications

References 8 publications

Magnetoimpedance Effect in CoFeMoSiB As-Quenched and Surface Modified Amorphous Ribbons in the Presence of Igon Oxide Nanoparticles of Water-Based Ferrofluid

Magnetoimpedance Effect in CoFeMoSiB As-Quenched and Surface Modified Amorphous Ribbons in the Presence of Igon Oxide Nanoparticles of Water-Based Ferrofluid

Magnetic iron oxide nanopowders produced by CO2 laser evaporation—‘In situ’ coating and particle embedding in a ceramic matrix

Interaction of iron oxide nanoparticles synthesized by laser target evaporation with polyacrylamide in composites and ferrogels

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