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

Kento Ueno; Motoyoshi Kobayashi; Yasuhisa Adachi; Takashi Kojima

doi:10.15625/0868-3166/24/3S1/3267

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

Kento Ueno, Motoyoshi Kobayashi, Yasuhisa Adachi, Takashi Kojima

Author affiliations

Authors

Kento Ueno Graduate School and Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1Tennodai, Tsukuba, Ibaraki 305-8572, Japan
Motoyoshi Kobayashi Communications in Physics, VAST
Yasuhisa Adachi Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
Takashi Kojima Graduate School of Science and Technology, Chiba University, 1-33 Yayoicho, Inage-ku, Chiba 263-8522, Japan

DOI:

https://doi.org/10.15625/0868-3166/24/3S1/3267

Keywords:

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

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\(_{2}\).

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Published

25-09-2014

How to Cite

[1]

K. Ueno, M. Kobayashi, Y. Adachi and T. Kojima, Electric Charging and Colloid Stability of Fabricated Nedle-Like \(\mbox{TiO}_{2}\) Nanoparticles, Comm. Phys. 24 (2014) 13–21. DOI: https://doi.org/10.15625/0868-3166/24/3S1/3267.

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Issue

Vol. 24 No. 3S1 (2014)

Section

Papers

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