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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

222
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
222
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

795
Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
795
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

940
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:
940
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.1K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

656
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
656
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.0K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Related Experiment Video

Updated: Jul 13, 2025

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Data-Driven oriented diatomic doping strategy to customize frequency dispersion for considerable microwave

Gang Fang1, Yue Wu1, Guoyue Xu1

  • 1School of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China.

Journal of Colloid and Interface Science
|October 16, 2023
PubMed
Summary
This summary is machine-generated.

A data-driven approach guided the creation of B/N doped C/Fe3C composites, optimizing electromagnetic parameters for enhanced microwave absorption. This strategy achieved a 7.2 GHz absorption bandwidth, offering a new path for material design.

Keywords:
Data-driven methodDiatomic dopingElectromagnetic parametersMicrowave absorption

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Area of Science:

  • Materials Science
  • Electromagnetics
  • Nanotechnology

Background:

  • Electromagnetic (EM) parameters are crucial for microwave absorption, but current optimization methods are often random.
  • Achieving broad absorption requires specific frequency-dispersion of permittivity, which is challenging to control experimentally.

Purpose of the Study:

  • To employ a data-driven approach to predict optimal EM parameters for microwave absorption.
  • To design and synthesize novel magnetoelectric composites with tailored EM properties.
  • To investigate the impact of doping on polarization resonances and microwave absorption.

Main Methods:

  • Data-driven modeling to forecast EM parameter requirements.
  • Synthesis of B/N diatomic doped C/Fe3C magnetoelectric composites.
  • First-principle calculations to analyze charge density and polarization.
  • Measurement of microwave absorption properties.

Main Results:

  • The data-driven approach indicated a need for fierce frequency-dispersion of permittivity, mitigated by magnetic components.
  • B/N doping in C/Fe3C composites created diverse dipole pairs, activating multi-polarization resonances.
  • First-principle calculations confirmed B's role in enhancing low-frequency polarization.

Conclusions:

  • The developed B/N doped C/Fe3C composites exhibit excellent microwave absorption.
  • An effective absorption bandwidth of 7.2 GHz was achieved at a thickness of 2.1 mm.
  • Combining data-driven strategies with doping engineering offers effective guidelines for advanced microwave absorber design.