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Search for "magnetite" in Full Text gives 81 result(s) in Beilstein Journal of Nanotechnology.

Antimicrobial nanospheres thin coatings prepared by advanced pulsed laser technique

  • Alina Maria Holban,
  • Valentina Grumezescu,
  • Alexandru Mihai Grumezescu,
  • Bogdan Ştefan Vasile,
  • Roxana Truşcă,
  • Rodica Cristescu,
  • Gabriel Socol and
  • Florin Iordache

Beilstein J. Nanotechnol. 2014, 5, 872–880, doi:10.3762/bjnano.5.99

Graphical Abstract
  • -chitosan-magnetite-eugenol (PLA-CS-Fe3O4@EUG) nanospheres by matrix assisted pulsed laser evaporation (MAPLE). Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) investigation proved that the homogenous Fe3O4@EUG nanoparticles have an average diameter of about 7 nm, while the PLA
  • ) bacteria strains. Moreover, the obtained nano-coatings showed a good biocompatibility and facilitated the normal development of human endothelial cells. These nanosystems may be used as efficient alternatives in treating and preventing bacterial infections. Keywords: antimicrobial; chitosan; magnetite
  • nanoparticles; nanospheres; P. aeruginosa; polylactic acid; S. aureus; Introduction Driven by more and more microbial antibiotic resistance, alternative therapeutic approaches are emerging [1][2][3][4]. Polar and nonpolar, functionalized and non-functionalized magnetite nanostructures have proven successfully
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Published 18 Jun 2014

Manipulation of isolated brain nerve terminals by an external magnetic field using D-mannose-coated γ-Fe2O3 nano-sized particles and assessment of their effects on glutamate transport

  • Tatiana Borisova,
  • Natalia Krisanova,
  • Arsenii Borуsov,
  • Roman Sivko,
  • Ludmila Ostapchenko,
  • Michal Babic and
  • Daniel Horak

Beilstein J. Nanotechnol. 2014, 5, 778–788, doi:10.3762/bjnano.5.90

Graphical Abstract
  • of iron salts, namely FeCl2 and FeCl3, by rapid increase of pH by ammonia. Similarly as described in [12], this was followed by the oxidation of the resulting magnetite (Fe3O4) with sodium hypochlorite producing maghemite (γ-Fe2O3), which is chemically more stable than Fe3O4. This is in contrast to
  • magnetite, which undergoes spontaneous oxidation by air. Proof of the maghemite by Mössbauer spectroscopy and powder X-ray diffraction, as well as its magnetic properties were described in our previous reports [15][16]. The neat γ-Fe2O3 nanoparticles were used in control experiments with cells or were used
  • solution (350 mL) under a nitrogen atmosphere. The resulting coagualate of magnetite was left to grow for 45 min under nitrogen atmosphere, then magnetically separated and repeatedly (7–10×) washed (peptized) with Q-water to remove all impurities (including NH4Cl) remaining after the synthesis. Finally
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Published 04 Jun 2014

Thermal stability and reduction of iron oxide nanowires at moderate temperatures

  • Annalisa Paolone,
  • Marco Angelucci,
  • Stefania Panero,
  • Maria Grazia Betti and
  • Carlo Mariani

Beilstein J. Nanotechnol. 2014, 5, 323–328, doi:10.3762/bjnano.5.36

Graphical Abstract
  • infrared spectrum of the sample heated at 470 K (sample 3) is very similar to that of sample 2, while after the thermal treatment at 560 K (sample 4), the minimum around 700 cm−1 becomes deeper and the transmittance below 600 cm−1 decreases, which strongly resembles the infrared spectrum of magnetite
  • treatment at T2 = 560 K. Moreover, at T2 a significant part of the sample is transformed into magnetite. We remark that the IR spectra are measured in transmission mode, so that they probe the whole thickness of the NW powders and are not limited to their surface. This issue is important to compare the IR
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Published 19 Mar 2014

Magnetic interactions between nanoparticles

  • Steen Mørup,
  • Mikkel Fougt Hansen and
  • Cathrine Frandsen

Beilstein J. Nanotechnol. 2010, 1, 182–190, doi:10.3762/bjnano.1.22

Graphical Abstract
  • direction in a double chain of 24 ~70 nm magnetite (Fe3O4) particles in magnetotactic bacteria [33], and it has resolved magnetic flux closure in small rings of 5–7 Co particles with a diameter of about 25 nm [32]. Influence of exchange coupling between nanoparticles on magnetic relaxation In a perfect
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Published 28 Dec 2010

Magnetic nanoparticles for biomedical NMR-based diagnostics

  • Huilin Shao,
  • Tae-Jong Yoon,
  • Monty Liong,
  • Ralph Weissleder and
  • Hakho Lee

Beilstein J. Nanotechnol. 2010, 1, 142–154, doi:10.3762/bjnano.1.17

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  • ][37][38][39][40][41][42]. CLIO nanoparticles contain a superparamagnetic iron oxide core (3–5 nm monocrystalline iron oxide) composed of ferrimagnetic magnetite (Fe3O4) and/or maghemite (γ-Fe2O3). The metallic core is subsequently coated with biocompatible dextran, before being cross-linked with
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Published 16 Dec 2010

Uniform excitations in magnetic nanoparticles

  • Steen Mørup,
  • Cathrine Frandsen and
  • Mikkel Fougt Hansen

Beilstein J. Nanotechnol. 2010, 1, 48–54, doi:10.3762/bjnano.1.6

Graphical Abstract
  • Equation 1, and the latter approximation is valid at low temperatures. The linear temperature dependence of the magnetization in nanoparticles was first observed by Mössbauer spectroscopy studies of magnetite (Fe3O4) nanoparticles [3], but it has later been studied in nanoparticles of several other
  • the relaxation is fast compared to the timescale of Mössbauer spectroscopy, and the observed magnetic hyperfine field is then given by where B0 is the saturation hyperfine field. Figure 3 shows the temperature dependence of the magnetic hyperfine field of three samples of magnetite (Fe3O4
  • dependence of the magnetization. TB is the superparamagnetic blocking temperature and TC is the Curie temperature. The reduced average magnetic hyperfine field as a function of temperature for particles of magnetite with sizes of 6 nm, 10 nm and 12 nm. The solid lines are the best linear fits to the
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Published 22 Nov 2010
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