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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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Frequency-Selective Radar-Absorbing Composites Using Hybrid Core-Shell Spheres.

Uiseok Hwang1, Jae-Do Nam1

  • 1Department of Polymer Science and Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea.

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This study introduces smart radar-absorbing materials (RAMs) with tunable frequency selectivity. These materials effectively absorb electromagnetic waves, enhancing safety and electronic device stability.

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compositescore−shell sphereselectromagnetic interference shieldingfrequency selectivityradar-absorbing materialsstealth aircraft

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Area of Science:

  • Materials Science
  • Electromagnetics
  • Nanotechnology

Background:

  • Radar-absorbing materials (RAMs) are vital for minimizing electromagnetic (EM) wave reflection from surfaces, crucial for stealth technology and electronic device stability.
  • Existing RAM research often overlooks frequency selectivity, creating a need for tunable absorption capabilities across various EM spectra.
  • Advanced stealth aircraft and electronic systems require robust protection against a wide range of EM radiation frequencies.

Purpose of the Study:

  • To develop novel smart RAMs with frequency-selective absorption capabilities.
  • To address the research gap in tunable frequency selectivity for RAMs.
  • To create effective isotropic coverings for metallic surfaces with tailored EM wave absorption.

Main Methods:

  • Incorporation of core-shell spheres (metal-shelled and graphene-shelled) within a polymer matrix.
  • Tailoring X-band (8.2-12.4 GHz) absorption frequencies by adjusting interstitial spaces between metallic spheres.
  • Utilizing graphene networks for efficient attenuation of scattered waves.

Main Results:

  • A 2 mm-thick composite on a metal substrate achieved a maximum absorption efficiency of 99.3%.
  • Demonstrated structural tunability and frequency-selective absorption properties.
  • Successfully trapped and extinguished incident electromagnetic waves.

Conclusions:

  • The proposed smart RAMs offer tunable, frequency-selective absorption in the X-band.
  • The composite structure effectively attenuates scattered waves using graphene networks.
  • This scalable approach provides functional isotropic coverings for diverse metallic surfaces.