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The characterization of silica microparticles by electrophoretic mobility measurements |
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| Authors: | P G Dietrich K -H Lerche J Reusch R Nitzsche |
| Institution: | 1. K?llnische Str. 35, 12439, Berlin, Germany 2. AERES GmbH, Rudower Chaussee 5, 12484, Berlin, Germany 3. Omnichrom, Kanalstr. 7, 12357, Berlin, Germany 4. M-M-Partikelmesstechnik, 02681, Kirschau, Germany |
| Abstract: | Summary Electrophoretic mobility measurements in the pH 2‐10 range are described for several commercial HPLC silica microparticles and a laboratory-produced product. The content of metal impurities for the silicas was also determined by AAS. An acidic/hydrothermal treatment was used to generate a more homogenous surface for some of the silicas. The zero points of charge (zpc) for both a native and a treated silica plus several commercial HPLC silicas were compared. The electrophoretic mobility method may be useful in predicting the utility of certain types of silica supports for chromatographic separations. |
| Keywords: | Silica surface Electrophoretic mobility Metal impurities Zero point of charge |
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