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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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Diamagnetism01:26

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Magnetic Susceptibility and Permeability01:31

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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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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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Paramagnetism01:30

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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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Towards Macroscopically Anisotropic Functionality: Oriented Metallo-supramolecular Polymeric Materials Induced by

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  • 1Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan.

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|October 14, 2020
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Summary

Synthesized metallo-supramolecular polymers [poly(3-hexylthiophene)-b-poly(ethylene oxide)] with controlled block ratios. Magnetic fields induced ordered films, but insulating PEO segments reduced P3HT backbone photoconductivity.

Keywords:
anisotropic orientationmagnetic field alignmentmetallo-supramolecular copolymersself-assemblyterpyridines

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Metallo-supramolecular polymers offer tunable properties through self-assembly.
  • Poly(3-hexylthiophene) (P3HT) is a conductive polymer with potential in organic electronics.
  • Poly(ethylene oxide) (PEO) is an insulating polymer often used for its processing advantages.

Purpose of the Study:

  • To synthesize and characterize metallo-supramolecular P3HT-b-PEO diblock copolymers.
  • To investigate the formation of oriented polymer films using magnetic fields.
  • To evaluate the effect of PEO segments on the photoconductivity of aligned P3HT.

Main Methods:

  • Synthesis of P3HT-b-PEO via self-selective complexation.
  • Magnetic field-assisted solvent evaporation for film orientation (9 T).
  • Characterization using POM, AFM, UV/Vis, GI-SAXS/WAXS, ATR-FTIR, and FP-TRMC.

Main Results:

  • Achieved anisotropic, ordered layer structure in [P3HT20-Zn-PEO107] films.
  • Successfully removed PEO domains using TEA-EDTA, confirmed by spectroscopy.
  • Observed diminished photoconductivity along the P3HT backbone due to insulating PEO.

Conclusions:

  • Aligned P3HT-b-PEO films exhibit ordered structures.
  • Selective removal of PEO is feasible without damaging the P3HT.
  • Insulating PEO domains negatively impact the anisotropic photoconductivity of the P3HT backbone.