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Related Experiment Video

Updated: Jun 25, 2026

Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
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Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals

Published on: February 9, 2017

Phase transformations during sintering of titania nanoparticles.

Vishal N Koparde1, Peter T Cummings

  • 1Department of Chemical Engineering, Vanderbilt University, Nashville, Tennessee 37235, USA. vishal.koparde@alumni.vanderbilt.edu

ACS Nano
|February 12, 2009
PubMed
Summary

Titanium dioxide (TiO2) nanoparticle stability and phase transformation depend on environmental factors like temperature and medium. Simulations reveal sintering promotes transformation to rutile or brookite phases near melting points.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • The anatase and rutile phases of titanium dioxide (TiO2) nanoparticles exhibit different stabilities influenced by environmental conditions.
  • The crossover diameter, where anatase becomes more stable than rutile, varies with the nanoparticle's surrounding medium and temperature.
  • Phase transformations are linked to ionic mobility, particularly at elevated temperatures approaching the melting point.

Purpose of the Study:

  • To investigate the sintering-induced phase transformations of TiO2 nanoparticles using molecular dynamics simulations.
  • To determine the influence of initial nanoparticle phases (anatase, rutile, amorphous) and environmental conditions on the final agglomerate phase.
  • To explore the role of temperature and nanoparticle environment on phase stability and transformation.

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Published on: July 4, 2017

Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate
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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate

Published on: February 23, 2016

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Last Updated: Jun 25, 2026

Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
11:17

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Published on: February 9, 2017

The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance
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Main Methods:

  • Utilized multiparticle multiphase molecular dynamics simulations.
  • Simulated the sintering process of TiO2 nanoparticles under various conditions.
  • Analyzed the resulting agglomerate phases after sintering events.

Main Results:

  • The final phase of the sintered agglomerate was dependent on the initial phases of the nanoparticles involved.
  • Sintering involving a rutile nanoparticle resulted in a rutile agglomerate.
  • Sintering of anatase and amorphous TiO2 nanoparticles led to the formation of a brookite agglomerate.
  • Phase transformations were predominantly observed at temperatures near the melting point of the nanoparticles.

Conclusions:

  • Environmental factors significantly influence the crossover diameter and stability of TiO2 nanoparticle phases.
  • Sintering is a key mechanism for phase transformation in TiO2 nanoparticles at elevated temperatures.
  • The presence of specific initial phases dictates the final structure of sintered TiO2 nanoparticle agglomerates, with rutile and brookite being favored outcomes under simulated conditions.