Size distribution change of titania nano-particle agglomerates generated by gas phase reaction, agglomeration, and sintering

Koichi Nakaso, Toshiyuki Fujimoto, Takafuimi Seto, Manabu Shimada, Kikuo Okuyama, Melissa M. Lunden

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54 Citations (Scopus)


In the manufacturing of nanometer-sized material particlulates by aerosol gas-to-particle conversion processes, it is important to analyze how the gas-phase chemical reaction, nucleation, agglomeration, and sintering rates control the size distribution and morphology of particles. In this study, titania particles were produced experimentally by the thermal decomposition of titanium tetraisopropoxide (TTIP) and oxidation of titanium tetrachloride (TiCI4) using a laminar flow aerosol reactor. The effect of reaction temperature on the size and morphology of the generated particles was investigated under various conditions. The size distributions of agglomerates were measured using a DMA/CNC system. The size distributions of primary particles were measured using TEM pictures of the agglomerates sampled by a thermophoretic aerosol sampler. In order to model the growth of both agglomerates and primary particles simultaneously, a two-dimensional discrete-sectional representation of the size distribution was employed, solving the aerosol general dynamic equation for chemical reaction, agglomeration, and sintering. Qualitative agreement between the experimentally observed results and the simulation are satisfactory for the large variations in reactor temperature explored.

Original languageEnglish
Pages (from-to)929-947
Number of pages19
JournalAerosol Science and Technology
Issue number5
Publication statusPublished - Jan 1 2001
Externally publishedYes


ASJC Scopus subject areas

  • Environmental Chemistry
  • Materials Science(all)
  • Pollution

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