Acoustophoretic studies of aqueous suspensions of alumina and 8 mol% yttria stabilised zirconia powders |
| |
| Affiliation: | 1. Institute of Theoretical and Applied Mechanics SB RAS, 4/1 Institutskaya st.,Novosibirsk,630090, Russian Federation;2. Ugra State University, 16 Chekhov str., Khanty-Mansiysk, 628012, Russian Federation;3. Siberian State University of Water Transport, 33 Schetinkina, Novosibirsk, 630099, Russian Federation;4. Novosibirsk State Technical University, 20 K. Marksa pr., Novosibirsk, 630073, Russian Federation;1. Department of Biomaterials and Bioengineering, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto, Tokushima 770-8504, Japan;2. Department of Comprehensive Dentistry, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto, Tokushima 770-8504, Japan;1. College of Electronic Information and Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;3. College of Materials Sciences and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, PR China;2. College of Materials and Mineral Resources, Xi''an University of Architecture and Technology, Xi''an, Shaanxi 710055, PR China;1. INRS- Énergie, Matériaux, Télécommunications, Varennes, Québec, J3X 1S2, Canada;2. INSA-Lyon, MATEIS CNRS UMR 5510, 69621 Villeurbanne, France;3. Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, Grenoble INP (Institute of Engineering Univ. Grenoble Alpes), LEPMI, 38000 Grenoble, France;4. Réseau sur le Stockage Electrochimique de l''Energie (RS2E), CNRS, FR3459, 33 Rue Saint Leu, 80039 Amiens Cedex, France |
| |
| Abstract: | The iso electric points (IEPS) of four alumina powders and three 8 mol% yttria stabilised zirconia powders were investigated using acoustophoresis to measure the zeta potential as a function of pH. All the powders were characterised by X-ray fluorescence spectroscopy for elemental composition and BET nitrogen adsorption for surface area. Initial experiments revealed that the IEPS of the alumina powders were independent of the volume fraction of the alumina suspensions. Further experiments investigated the effect of adjusting the pH with different bases, i.e. NaOH, KOH, and NH4OH, on the IEPS of the alumina powders. The IEP of an individual powder was independent of the base used, however, the degree of hysteresis varied depending on the polarisability of the cation. The smallest degree of hysteresis was recorded with additions of NaOH. The differences in IEP between the alumina powders were attributed to the different surface chemistries of the powders. For the zirconia powders the IEP of each suspension was identified using HCl and NaOH to adjust the pH. Again the differences in the IEP were attributed to different surface chemistries of the powders. Two of the powders demonstrated an IEP of approximately 6.5; however the Tosoh powder suspension demonstrated considerable hysteresis and an IEP of 9.3. This was due to its natural pH being an approximate pH unit lower than the other two powders. At this lower natural pH, yttria dissolved out of the Tosoh powder, generating yttrium ions in solution. These precipitated onto the powder surface and altered the surface chemistry with time; i.e increased the zeta potential. Atomic absorption experiments on the supernatant confirmed the dissolution of the yttria from the Tosoh powder. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
