Zeta potential measurement on lithium lanthanum titanate nanoceramics--颗粒学报PARTICUOLOGY

Pila, C. R. M., Cappe, E. P., Laffita, Y. M., & Alves, O. L. (2016). Zeta potential measurement on lithium lanthanum titanate nanoceramics. Particuology, 24, 69-72. https://doi.org/10.1016/j.partic.2014.12.005

Zeta potential measurement on lithium lanthanum titanate nanoceramics

Carlos Ricardo Milian Pila ^a, Eduardo Pérez Cappe ^a, Yodalgis Mosqueda Laffita ^a *, Oswaldo Luiz Alves ^b

a Institute of Materials Science and Technology (IMRE), Havana University, Havana CP 10400, Cuba
b Solid State Chemistry Laboratory, Institute of Chemistry, Campinas University, Campinas CP 13083-970, SP, Brazil

10.1016/j.partic.2014.12.005

Volume 24, February 2016, Pages 69-72

Received 2 August 2014, Revised 21 November 2014, Accepted 4 December 2014, Available online 9 April 2015, Version of Record 21 January 2016.

E-mail: yodalgis@imre.oc.uh.cu; barlomepardo@gmail.com

Highlights

• Zeta potential ζ, isoelectric point IEP and agglomeration of Li_0.5La_0.5TiO₃ colloidal suspensions were studied.

• Zeta potential of Li_0.5La_0.5TiO₃ varied from positive to negative with increasing pH from 2 to 8.

• Li_0.5La_0.5TiO₃ suspensions reached the isoelectric point at pH range of 3–5.

• Li_0.5La_0.5TiO₃ colloidal suspensions were stable in the pH range of 7.0–8.0.

• Li_0.5La_0.5TiO₃ nanoparticles aggregated rapidly at ionic strengths >1 mmol/dm³.

Abstract

The zeta potential, isoelectric point, and agglomeration of Li_0.5La_0.5TiO₃ (LLTO) nanoparticles dispersed in aqueous media at different ionic strengths have been studied. The zeta potential was determined from electrophoretic mobility measurements, according to Smoluchowski's equation, for Li_0.5La_0.5TiO₃ suspensions in NaCl and KCl electrolytes with ionic strengths of 1, 10, and 100 mmol/dm3. The isoelectric point (IEP), zeta potential (ζ), and the agglomeration were shown to strongly depend on the ionic strength of the Li0.5La0.5TiO3 aqueous colloidal suspension in both NaCl and KCl electrolytes, which allows the determination of the effects of environmental conditions for Li_0.5La_0.5TiO₃ manipulation in aqueous colloidal systems. The suspensions of Li_0.5La_0.5TiO₃ nanoparticles reach the IEP in the pH range of 3–5. The ζ of Li_0.5La_0.5TiO₃ nanoparticles varied from positive to negative values with a pH increase, which allows for the control of the surface charge depending on the purpose. The pH range of 7–8 and an ionic strength ≤1 mmol/dm³ are recommended as the most suitable conditions for both the LLTO colloidal shaping techniques application and the LLTO-based nanocomposite formation.

Graphical abstract

Keywords

Titanate; Nanoparticles; Zeta potential; Colloidal suspension

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