Journal article
The surface chemistry of sapphire-c: A literature review and a study on various factors influencing its IEP
J Lützenkirchen, GV Franks, M Plaschke, R Zimmermann, F Heberling, A Abdelmonem, GK Darbha, D Schild, A Filby, P Eng, JG Catalano, J Rosenqvist, T Preocanin, T Aytug, D Zhang, Y Gan, B Braunschweig
Advances in Colloid and Interface Science | ELSEVIER SCIENCE BV | Published : 2018
Abstract
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. Literature suggests that factors like origin of the sample, sample treatment or the method of investigation all h..
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Awarded by National Science Foundation
Funding Acknowledgements
A portion of this research was supported by the U.S. Department of Energy, Office of Office of Basic Energy Sciences (J.R.) and Office of Electricity Delivery and Energy Reliability Superconductivity Program (T.A.), respectively. J.C. was supported by the U.S. National Science Foundation, Environmental Chemical Sciences program (award no. CHE-1505532). G.K.D. was supported by the Helmholtz Program NUSAFE, and has received partial funding by the Federal Ministry of Economics and Technology (BMWi) under the joint KIT-INE, GRS research projects "KOLLORADO-e2" (02E11456A) and the European 7th Framework Program (FP7/2007-2011) under grant agreement no. 295487 (BELBaR Project). Y. G. and D. Z. were supported by National Natural Science Foundation of China (51535003).