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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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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 gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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In-flow optical characterization of flame-generated carbon nanoparticles sampled from a premixed flame.

F Migliorini1, S Belmuso2, S Maffi1

  • 1CNR-ICMATE, Institute of Condensed Matter Chemistry and Technologies for Energy, Via R. Cozzi 53, 20125 Milan, Italy. silvana.deiuliis@cnr.it.

Physical Chemistry Chemical Physics : PCCP
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Summary
This summary is machine-generated.

Optical properties of carbon nanoparticles were studied using extinction and laser-induced incandescence. Findings reveal changes in absorption coefficient and band gap with flame height, indicating quantum confinement effects.

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Area of Science:

  • Nanoparticle characterization
  • Optical physics
  • Combustion science

Background:

  • Carbon nanoparticles (CNPs) exhibit unique optical properties influenced by their size and formation environment.
  • Understanding these properties is crucial for applications in catalysis, energy, and materials science.
  • Flame synthesis offers a route to control CNP characteristics.

Purpose of the Study:

  • To investigate the optical absorption properties of CNPs synthesized in an ethylene/air flame.
  • To determine the spectral absorption coefficient and optical band gap of CNPs at various heights above the burner.
  • To evaluate the refractive index absorption function (E(m)) and explore quantum confinement effects.

Main Methods:

  • In-flow extinction measurements across a wide spectral range.
  • Laser-induced incandescence (LII) measurements at different laser fluences.
  • Tauc plot analysis for optical band gap determination.
  • Evaluation of E(m) from low laser fluence LII data.

Main Results:

  • Absorption coefficient and optical band gap were obtained for CNPs sampled at different flame heights.
  • An increase in optical band gap with decreasing height suggests quantum confinement in the flame inception region.
  • Laser-induced incandescence revealed distinct particle temperature responses and enabled E(m) evaluation.
  • Optical properties, including E(m), showed significant variation with sampling height and excitation wavelength.

Conclusions:

  • The study demonstrates a correlation between CNP formation height in a flame and their optical properties.
  • Quantum confinement effects influence the optical band gap of nascent CNPs.
  • In-flow optical measurements provide valuable insights into the spectral absorption and refractive index of flame-synthesized CNPs.