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Related Concept Videos

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...
Atomic Absorption Spectroscopy: Atomization Methods01:25

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

Flame Photometry: Lab

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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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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Published on: November 22, 2021

Blue nano titania made in diffusion flames.

Alexandra Teleki1, Sotiris E Pratsinis

  • 1Particle Technology Laboratory, Institute of Process Engineering, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092, Zurich, Switzerland.

Physical Chemistry Chemical Physics : PCCP
|May 8, 2009
PubMed
Summary

Researchers developed a green, cost-effective method to create blue titanium suboxide nanoparticles. These nanoparticles offer a cobalt-free alternative to traditional blue pigments, with tunable properties and enhanced color stability.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Inorganic Chemistry

Background:

  • Traditional blue pigments often contain cobalt, raising environmental and health concerns.
  • Developing stable, cost-effective, and environmentally friendly blue colorants is a significant challenge in materials science.

Purpose of the Study:

  • To synthesize blue titanium suboxide nanoparticles without post-processing or dopants.
  • To control particle properties like size, phase, and color through flame synthesis parameters.
  • To explore the potential of these nanoparticles as a sustainable alternative to cobalt-based pigments.

Main Methods:

  • Combustion of titanium-tetra-isopropoxide (TTIP) vapor at atmospheric pressure.
  • Rapid flame quenching using a critical flow nozzle at varying heights to control particle characteristics.
  • Electron paramagnetic resonance (EPR) spectroscopy to analyze Ti3+ centers.
  • Co-oxidation with hexamethyldisiloxane to create SiO2-coated particles for enhanced stability.

Main Results:

  • Blue titanium suboxide nanoparticles (including Magneli phases) were synthesized directly via TTIP combustion.
  • Particle properties, including blue coloration and crystal size, were tunable by adjusting flame quenching parameters.
  • Particles exhibited broad near-infrared absorption and stable blue color in ambient conditions.
  • Controlled band gap energies from 3.2 to 3.6 eV were achieved.
  • SiO2-coated particles demonstrated enhanced color robustness and suboxidation.

Conclusions:

  • A cost-effective and green flame synthesis method for blue titanium suboxide nanoparticles was established.
  • These nanoparticles represent a viable, cobalt-free alternative to conventional blue pigments.
  • The tunable band gap and stable coloration offer potential for various optical and pigment applications.