Role of Surface Area, Primary Particle Size, and Crystal Phase on Titanium Dioxide Nanoparticle Dispersion Properties

Komkrit Suttiponparnit, Jingkun Jiang, Manoranjan Sahu, Sirikalaya Suvachittanont, Tawatchai Charinpanitkul, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

449 Scopus citations

Abstract

Characterizing nanoparticle dispersions and understanding the effect of parameters that alter dispersion properties are important for both environmental applications and toxicity investigations. The role of particle surface area, primary particle size, and crystal phase on TiO2 nanoparticle dispersion properties is reported. Hydrodynamic size, zeta potential, and isoelectric point (IEP) of ten laboratory synthesized TiO2 samples, and one commercial Degussa TiO2 sample (P25) dispersed in different solutions were characterized. Solution ionic strength and pH affect titania dispersion properties. The effect of monovalent (NaCl) and divalent (MgCl2) inert electrolytes on dispersion properties was quantified through their contribution to ionic strength. Increasing titania particle surface area resulted in a decrease in solution pH. At fixed pH, increasing the particle surface area enhanced the collision frequency between particles and led to a higher degree of agglomeration. In addition to the synthesis method, TiO2 isoelectric point was found to be dependent on particle size. As anatase TiO2 primary particle size increased from 6 nm to 104 nm, its IEP decreased from 6.0 to 3.8 that also results in changes in dispersion zeta potential and hydrodynamic size. In contrast to particle size, TiO2 nanoparticle IEP was found to be insensitive to particle crystal structure.

Original languageEnglish (US)
Article number27
Pages (from-to)1-8
Number of pages8
JournalNanoscale Research Letters
Volume6
Issue number1
DOIs
StatePublished - Jan 2011
Externally publishedYes

Keywords

  • Ionic strength
  • Isoelectric point
  • Nanoparticle dispersion
  • Nanotoxicology
  • Titania

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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