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Related Concept Videos

Fast Reactions01:27

Fast Reactions

Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...
Flame Photometry: Overview01:02

Flame Photometry: Overview

Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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Atomic Absorption Spectroscopy: Atomization Methods

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 aerosol...
Flame Photometry: Lab01:16

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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...

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Related Experiment Video

Updated: Jun 23, 2026

Reducing Willow Wood Fuel Emission by Low Temperature Microwave Assisted Hydrothermal Carbonization
09:46

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

Published on: May 19, 2019

Microwave flash pyrolysis.

Hee Yeon Cho1, Aida Ajaz, Dibya Himali

  • 1Department of Chemistry, University of New Hampshire, Durham, New Hampshire 03824, USA.

The Journal of Organic Chemistry
|May 13, 2009
PubMed
Summary
This summary is machine-generated.

Microwave flash pyrolysis (MFP) uses graphite or carbon materials to achieve high temperatures for chemical reactions, enabling processes like azulene rearrangement at lower temperatures than traditional methods.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Microwave heating is known to rapidly increase graphite surface temperatures.
  • Previous studies explored graphite thermal sensitization for specific reactions.
  • Conventional high-temperature reactions often require specialized equipment like flash vacuum pyrolysis (FVP) reactors.

Purpose of the Study:

  • To investigate the use of microwave thermal sensitization with graphite, carbon nanotubes, and silicon carbide.
  • To demonstrate the feasibility of performing high-temperature reactions typically requiring FVP under microwave irradiation.
  • To introduce and define a new method termed microwave flash pyrolysis (MFP).

Main Methods:

  • Utilizing graphite, multiwall carbon nanotubes, or silicon carbide as thermal sensitizers in a microwave reactor.
  • Conducting solid-phase reactions of various organic substrates, including azulene and phthalic anhydride.
  • Employing temperatures ranging from 100 to 300 degrees C, significantly lower than FVP.

Main Results:

  • Achieved rapid rearrangement of azulene to naphthalene at 100-300 degrees C, a reaction usually requiring 700-900 degrees C via FVP.
  • Observed similar results using multiwall carbon nanotubes as sensitizers.
  • Successfully performed other high-temperature reactions including phenanthrene synthesis, benzyne generation, phenyl radical formation, aryl-aryl bond cleavage, and cycloaromatizations.
  • Demonstrated the effectiveness of MFP for less volatile substrates.
  • Observed azulene rearrangement and benzyne generation using silicon carbide as a sensitizer.

Conclusions:

  • Microwave flash pyrolysis (MFP) offers a novel and efficient method for conducting high-temperature organic reactions at significantly reduced temperatures.
  • The use of thermal sensitizers like graphite, carbon nanotubes, and silicon carbide in microwave reactors expands the scope of accessible chemical transformations.
  • MFP presents an advantageous alternative to traditional methods like FVP, particularly for sensitive or less volatile compounds.