We show that the surface potential at a water oxide nanoparticle (NP) interface, long considered an immeasurable direct quantity, can be measured by X-ray photoelectron spectroscopy (XPS) from a liquid microjet. This new method does not require a priori knowledge of the particles' surface structure or of the ion distribution throughout the electrical double layer for its interpretation and can be applied to any colloidal suspension independent of composition, particle size and shape, and solvent. We demonstrate the application for aqueous suspensions of 9 nm colloidal silica (SiO2) at pH 0.3 and 10.0, where the surface potential changes from positive to negative. The experimental results are compared with calculated surface potentials based on Guoy-Chapman theory and are shown to be in good agreement.

Brown, M., Redondo, A., Sterrer, M., Winter, B., Pacchioni, G., Abbas, Z., et al. (2013). Measure of Surface Potential at the Aqueous-Oxide Nanoparticle Interface by XPS from a Liquid Microjet. NANO LETTERS, 13(11), 5403-5407 [10.1021/nl402957y].

Measure of Surface Potential at the Aqueous-Oxide Nanoparticle Interface by XPS from a Liquid Microjet

PACCHIONI, GIANFRANCO;
2013

Abstract

We show that the surface potential at a water oxide nanoparticle (NP) interface, long considered an immeasurable direct quantity, can be measured by X-ray photoelectron spectroscopy (XPS) from a liquid microjet. This new method does not require a priori knowledge of the particles' surface structure or of the ion distribution throughout the electrical double layer for its interpretation and can be applied to any colloidal suspension independent of composition, particle size and shape, and solvent. We demonstrate the application for aqueous suspensions of 9 nm colloidal silica (SiO2) at pH 0.3 and 10.0, where the surface potential changes from positive to negative. The experimental results are compared with calculated surface potentials based on Guoy-Chapman theory and are shown to be in good agreement.
Articolo in rivista - Articolo scientifico
nanoparticle, water, interface, silica
English
2013
13
11
5403
5407
none
Brown, M., Redondo, A., Sterrer, M., Winter, B., Pacchioni, G., Abbas, Z., et al. (2013). Measure of Surface Potential at the Aqueous-Oxide Nanoparticle Interface by XPS from a Liquid Microjet. NANO LETTERS, 13(11), 5403-5407 [10.1021/nl402957y].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/50110
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