J Lützenkirchen, G V Franks, M Plaschke, R Zimmermann, F Heberling, A Abdelmonem, G K Darbha, D Schild, A Filby, P Eng, J G Catalano, J Rosenqvist, T Preocanin, T Aytug, D Zhang, Y Gan, B Braunschweig
A wide range of isoelectric points (IEPs) has been reported in the literature for sapphire-c (α-alumina), also referred to as basal plane, (001) or (0001), single crystals. Interestingly, the available data suggest that the variation of IEPs is comparable to the range of IEPs encountered for particles, although single crystals should be much better defined in terms of surface structure. One explanation for the range of IEPs might be the obvious danger of contaminating the small surface areas of single crystal samples while exposing them to comparatively large solution reservoirs...
January 2018: Advances in Colloid and Interface Science