Multiinstrument Study of the Electrophoretic Mobility of Fumed Silica

Although silica is one of the most common adsorbents, the position of its isoelectric point (IEP) on the pH scale remains an open question. Different values from 1 to 4 have been published, and there is even a controversy about the very existence of the IEP. The discrepancies in the literature are a...

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Veröffentlicht in:Analytical chemistry (Washington) 2002-01, Vol.74 (1), p.253-256
Hauptverfasser: Kosmulski, Marek, Hartikainen, Juha, Ma̧czka, Edward, Janusz, Władysław, Rosenholm, Jarl B
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container_title Analytical chemistry (Washington)
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creator Kosmulski, Marek
Hartikainen, Juha
Ma̧czka, Edward
Janusz, Władysław
Rosenholm, Jarl B
description Although silica is one of the most common adsorbents, the position of its isoelectric point (IEP) on the pH scale remains an open question. Different values from 1 to 4 have been published, and there is even a controversy about the very existence of the IEP. The discrepancies in the literature are at least partially due to application of different instruments. Different zetameters produce different ζ potentials of silica in the acidic range and different IEP.
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subjects Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Silica
title Multiinstrument Study of the Electrophoretic Mobility of Fumed Silica
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