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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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Related Experiment Video

Updated: Nov 3, 2025

Reducing Willow Wood Fuel Emission by Low Temperature Microwave Assisted Hydrothermal Carbonization
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Reducing Willow Wood Fuel Emission by Low Temperature Microwave Assisted Hydrothermal Carbonization

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A Two-Step Microwave Annealing Process for PAN Pre-Oxidation through a TM-Mode Cavity.

Yan-Ren Chen1, Hsien-Wen Chao2, Hung-Chun Hsu2

  • 1Department of Materials Science and Engineering, National Tsing Hua University, 101, Section 2, Kuang Fu Road, Hsinchu 300044, Taiwan.

Polymers
|June 2, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel microwave annealing system for rapid carbon fiber pre-oxidation. The new method achieves high aromatic index in minutes, significantly accelerating the process compared to traditional techniques.

Keywords:
carbon fibermicrowave annealingnonthermal effectpolyacrylonitrilepre-oxidation

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Microwave Processing

Background:

  • Traditional carbon fiber pre-oxidation is time-consuming.
  • Optimizing pre-oxidation is crucial for high-performance carbon fibers.
  • Existing methods often lack efficiency and uniformity.

Purpose of the Study:

  • To develop a novel microwave annealing system for efficient carbon fiber pre-oxidation.
  • To investigate the effects of microwave annealing on polyacrylonitrile (PAN) fiber structure and properties.
  • To significantly reduce processing time for carbon fiber pre-oxidation.

Main Methods:

  • A TM-mode resonant cavity microwave annealing system with a silicon carbide (SiC) susceptor was designed.
  • A two-step microwave annealing process was applied to oxidize polyacrylonitrile (PAN) fiber.
  • Characterization techniques included scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Raman spectroscopy.

Main Results:

  • The microwave annealing system achieved a high aromatic index of 66.39% in just 13 minutes.
  • This represents a 9-fold increase in speed compared to traditional methods.
  • Raman spectra indicated a sheath-core factor closer to one for microwave-treated specimens, suggesting improved uniformity.

Conclusions:

  • The novel microwave annealing system offers a significantly faster and efficient method for carbon fiber pre-oxidation.
  • The system provides both nonthermal and thermal treatments, suitable for various dielectric properties.
  • Microwave annealing promotes structural uniformity, crucial for advanced carbon fiber applications.