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Related Concept Videos

IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
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Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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Atomic Absorption Spectroscopy: Overview01:27

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Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
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Induced Electric Dipoles01:28

Induced Electric Dipoles

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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One-dimensional core-shell CoC@CoFe/C@PPy composites for high-efficiency microwave absorption.

Zhengguo Jiao1, Jinhu Hu1, Mingliang Ma1

  • 1School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, People's Republic of China.

Journal of Colloid and Interface Science
|August 2, 2023
PubMed
Summary

New microwave absorbing materials, CoC@CoFe/C@PPy fibers, show excellent performance. These hierarchical composite fibers effectively reduce electromagnetic pollution with minimal thickness.

Keywords:
CoC@CoFe/C@PPy fibersCore-shell structureElectrostatic spinningMicrowave absorption

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electromagnetics

Background:

  • Growing electromagnetic pollution necessitates advanced microwave absorbing materials.
  • Prussian blue analogues (PBAs) offer tunable composition and morphology for material design.
  • PBAs are promising candidates for microwave absorption applications.

Purpose of the Study:

  • To develop novel hierarchical core-shell structured microwave absorbers.
  • To investigate the microwave absorption properties of CoC@CoFe/C@PPy composite fibers.
  • To optimize material composition and structure for enhanced performance.

Main Methods:

  • Hydrothermal coating of PBA on carbon composites.
  • Carbonization and subsequent PPy compounding to form core-shell fibers.
  • Optimization of microwave absorption by adjusting sample filling.

Main Results:

  • Successfully synthesized hierarchical CoC@CoFe/C@PPy fibers.
  • Achieved minimum reflection loss (RLmin) of -64.32 dB at 1.69 mm thickness.
  • Obtained maximum effective absorption bandwidth (EABmax) of 5.38 GHz at 1.88 mm thickness with 25 wt% filling.

Conclusions:

  • The unique hierarchical structure enhances microwave absorption capabilities.
  • CoC@CoFe/C@PPy composite fibers demonstrate significant potential for electromagnetic pollution mitigation.
  • Optimized material design leads to superior microwave absorption performance.