Role of Surface Area, Primary Particle Size, and Crystal Phase on Titanium Dioxide Nanoparticle Dispersion Properties
By Komkrit Suttiponparnit, Jingkun Jiang, M. Sahu, S. Suvachittanont, T. Charinpanitkul, P. Biswas. Nanoscale Research Letters, 2010
636 citations recorded by the source corpus.
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.
Subfields: Materials Chemistry, Renewable Energy, Sustainability and the Environment, Water Science and Technology
View Paper: https://www.semanticscholar.org/paper/46f93145844f661bc2459200ec1421b6c22c5dbc
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Citations in the corpus
- Titanium dioxide nanoparticles: a review of current toxicological data (2013, background): “Experimental evidence supports that TiO2 NP agglomeration increases when the surface area decreases at a constant pH and that the isoelectric point for TiO2 depends on the particle size [201].”
- Effective dispersion of nano-TiO2 powder for enhancement of photocatalytic properties in cement mixes (2013, background): “Due to environmental humidity, the surface of titanium dioxide nanoparticles is covered by hydroxyl groups [3,5].”
- Nanoparticle classification, physicochemical properties, characterization, and applications: a comprehensive review for biologists (2022, neutral): “Agglomeration can be prevented by increasing the zeta potential of nanomaterials (increasing the repulsive force) [19], optimizing the degree of hydrophilicity/hydrophobicity of the nanomaterial, or by optimizing the pH and the ionic strength of the suspension medium [20].”