Title: Comparison of potential of capillary zone electrophoresis and Malvern's improved laser Doppler velocimetry for characterisation of silica nanomaterials in aqueous media

Authors: N.G. Vanifatova; B.Ya. Spivakov; A. Kamyshny

Addresses: Vernadsky Institute of Geochemistry and Analytical Chemistry (GEOKHI), Russian Academy of Sciences, Kosygin Str. 19, Moscow, 119991 Russian Federation. ' Vernadsky Institute of Geochemistry and Analytical Chemistry (GEOKHI), Russian Academy of Sciences, Kosygin Str. 19, Moscow, 119991 Russian Federation. ' The Hebrew University of Jerusalem, Casali Institute of Applied Chemistry, Institute of Chemistry, Edmond Safra Camus, Givat-Ram, Jerusalem, 91904 Israel

Abstract: Two silica certified reference nanomaterials containing 50- and 100-nm particles were used for comparing electrophoretic mobility measurements by capillary zone electrophoresis and Malvern|s improved laser Doppler velocimetry under the same experimental conditions. Phosphate buffer solutions with concentrations of 2.5 and 5.0 mM, at pH 8.5 and 6.2 were used for preparation of dispersions. These dispersions were stable sufficiently to perform measurements. The values of absolute electrophoretic mobility determined by a Malvern|s improved laser Doppler velocimetry were found to be lower than those determined by a capillary zone electrophoresis. In addition, the results of size measurements by dynamic light scattering and scanning electronic microscopy were compared. The reasons for differences in measured values are discussed.

Keywords: silica CRM; certified reference nanomaterials; capillary zone electrophoresis; CZE; Malvern|s improved LDV; laser Doppler velocimetry; MLDV; laser Doppler velocimetry; dynamic light scattering; DLS; scanning electronic microscopy; SEM; nanotechnology.

DOI: 10.1504/IJNP.2011.043499

International Journal of Nanoparticles, 2011 Vol.4 No.4, pp.369 - 380

Received: 08 May 2010
Accepted: 09 Nov 2010
Published online: 13 Mar 2015 *

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