Electric Charging and Colloid Stability of Fabricated Nedle-Like \(\mbox{TiO}_{2}\) Nanoparticles

Kento Ueno, Motoyoshi Kobayashi, Yasuhisa Adachi, Takashi Kojima

Abstract


Charging and stability of needle-like TiO\(_{2}\) nanoparticles were studied. Measured isoelectric point (IEP) was pH~4 and lower than that of spherical ones pH~6. Heat treatment at 400\(\text{\r{}}\)C changed the IEP from 4 to 6. The shift is probably due to shape controller (ethylenediamine). The particles aggregate around IEP and thus are charge-stabilized. Experimental hydrodynamic diameters of needle-like particles showed a reasonably good agreement with the theoretical diameter. That is, the particles can be dispersed to primary particles. 1pK Stern and standard electrokinetic models describe electrophoretic mobility of needle-like TiO\(_{2}\), indicating that double layer relaxation is significant for needle-like TiO\(_{2}\).


Keywords


electrophoretic mobility, isoelectric point, 1pK Stern model, double layer relaxation, aggregation, hydrodynamic diameter

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DOI: https://doi.org/10.15625/0868-3166/24/3S1/3267 Display counter: Abstract : 25 views. PDF : 22 views.

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