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Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes02:14

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The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were  initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified...
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Flame Photometry: Overview01:02

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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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Combustion, commonly known as burning, is a reaction in which a substance reacts with an oxidizing agent, which in most cases is molecular oxygen, to liberate energy in the form of heat, light, or sound. The heat of combustion is also known as the enthalpy of combustion. The energy released when one mole of a substance undergoes complete combustion at constant pressure is called molar heat of combustion. Combustion reactions are exothermic; that is, they release energy, and their ΔH sign...
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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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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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Updated: Sep 10, 2025

Preparation and Evaluation of Hybrid Composites of Chemical Fuel and Multi-walled Carbon Nanotubes in the Study of Thermopower Waves
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Combustion Waves and Flame Stability in Nanocomposites.

Suyong Kim1, Anqi Wang2, John Z Wen2

  • 1Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.

ACS Nano
|August 26, 2025
PubMed
Summary

This study introduces a framework for understanding combustion in nanocomposites. It reveals how nanoparticle sintering affects flame speed and stability, paving the way for controlled combustion in advanced materials.

Keywords:
combustion waveenergetic materialsflame instabilityheterogeneous combustioninterfacial engineeringnanocompositesreactive sintering

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Area of Science:

  • Materials Science
  • Combustion Science
  • Nanotechnology

Background:

  • Combustion in nanocomposites is complex, involving multi-scale interactions.
  • Developing unified theories for combustion wave dynamics is challenging.

Purpose of the Study:

  • To present a theoretical and experimental framework for a unified theory of combustion wave dynamics and instabilities in nanocomposites.
  • To characterize flame morphology and combustion wave behavior across varying reactivity levels.

Main Methods:

  • High-speed microscopic imaging to observe flame morphology and wave behavior.
  • Theoretical analysis of wave stability.
  • Macroscopic observations for validation.

Main Results:

  • Combustion wave speed correlates strongly with reactivity, exceeding classical laminar flame theory predictions.
  • Instability causes wave speed to decrease above a certain reactivity threshold.
  • Heterogeneous flame structures due to nanoparticle sintering drive the strong reactivity correlation.
  • Unstable waves exhibit corrugated fronts prone to quenching from heat loss in sintered nanoparticles.

Conclusions:

  • The findings provide a foundation for theory-guided strategies to control combustion in nanocomposites.
  • This research enables the design of reactive nanocomposites beyond empirical methods.