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Related Concept Videos

π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
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In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
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Patterning via Optical Saturable Transitions - Fabrication and Characterization
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Color morphing surfaces with effective chemical shielding.

Adil Majeed Rather1, Sravanthi Vallabhuneni1, Austin J Pyrch2

  • 1Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, 27695, USA.

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|May 3, 2024
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Summary

Researchers developed durable, color-morphing surfaces by combining photochromic dyes with superomniphobic materials. This innovation provides chemical shielding, enhancing material longevity for applications like camouflage and rewritable displays.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Optoelectronics

Background:

  • Photochromic materials change color with light but degrade in humid or chemical conditions.
  • Superomniphobicity offers chemical shielding but is challenging to integrate with color-changing properties.
  • Rational surface design is crucial for combining color morphing and superomniphobicity.

Purpose of the Study:

  • To systematically design and synthesize surfaces exhibiting both color morphing and superomniphobicity.
  • To investigate the impact of polymer polarity and composition on material performance.
  • To demonstrate the versatility of the developed surfaces for various applications.

Main Methods:

  • One-pot synthesis combining photochromic dyes, low surface energy materials, and polymers.
  • Spray coating technique to achieve desired surface texture and properties.
  • Systematic investigation of material composition and polymer polarity effects.

Main Results:

  • Successful design of surfaces with simultaneous color morphing and superomniphobicity.
  • Demonstrated effective chemical shielding against environmental degradation.
  • Tuned color morphing kinetics and superomniphobicity by adjusting material composition and polymer polarity.

Conclusions:

  • Developed a versatile method for creating robust, color-morphing surfaces with chemical resistance.
  • The approach allows for customization with various pigments and substrates.
  • Potential applications include advanced camouflage, soft robotics, data storage, and protective eyewear.