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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Colors and Magnetism03:02

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Nuclear Stability03:18

Nuclear Stability

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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively...
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Paramagnetism01:30

Paramagnetism

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
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Stability of core-shell magnetite nanoparticles.

B Kalska-Szostko1, U Wykowska1, D Satuła2

  • 1Institute of Chemistry, University of Bialystok, Hurtowa 1, 15-399 Bialystok, Poland.

Colloids and Surfaces. B, Biointerfaces
|October 12, 2013
PubMed
Summary

Three magnetite nanoparticle types were synthesized and tested for stability in various solutions, including white wine. Their structural and magnetic properties were analyzed to understand their behavior in different chemical environments.

Keywords:
Magnetic nanoparticlesMössbauer spectroscopyNanoparticles stability

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Magnetite nanoparticles (Fe3O4) are widely used in various applications due to their magnetic properties.
  • Understanding nanoparticle stability is crucial for their effective application in diverse environments.
  • Surface modification and synthesis methods significantly influence nanoparticle behavior.

Purpose of the Study:

  • To synthesize and characterize three distinct types of magnetite nanoparticles.
  • To evaluate the stability of these nanoparticles in different aqueous and non-aqueous solutions.
  • To investigate the impact of synthesis methods and environments on nanoparticle properties.

Main Methods:

  • Co-precipitation of iron chlorides with and without SiO2.
  • Thermal decomposition of iron(III) acetylacetonate.
  • Stability testing in distilled water, acetic acid, citric acid, NaCl, and white wine.
  • Characterization using infrared spectroscopy, atomic absorption spectroscopy, transmission electron microscopy, X-ray diffraction, differential scanning calorimetry, and Mössbauer spectroscopy.

Main Results:

  • Successfully synthesized core-shell magnetite nanoparticles via two different methods.
  • Demonstrated varying degrees of nanoparticle stability across different tested media.
  • Observed structural and magnetic property modifications influenced by synthesis and environmental conditions.

Conclusions:

  • The synthesis method and surrounding medium significantly affect magnetite nanoparticle stability and properties.
  • These findings are important for optimizing the use of magnetite nanoparticles in applications involving diverse chemical conditions.
  • Further research can explore tailored synthesis for enhanced stability in specific environments.