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The most important parameters for determining the stability of dispersions are the zeta potential and the particle charge density. Even small changes in these parameters, as they occur in the formulation and preparation of dispersions, can lead to destabilization. The selective determination of the zeta potential on diluted samples allows only vague statements about the influence of the individual process additives on the stability of the formulations. The Stabino® II measures either the zeta or flow potential (streaming current potential). Conductivity, pH value and temperature are determined simultaneously. In contrast to the commonly used measuring instruments, which are based on an optical measurement of the zeta potential,theStabino®II canalsocontinuouslymeasurethedispersionstabilityon concentrated (up to 40 % by volume) and sedimenting (from 0.3 nm to 300 μm) samples during a titration. This allows specific statements to be made about the influence of the individual additives on stability and saves time during formulation.
Measurement principle | Zeta streaming potential |
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Size range | 0.3 nm - 300 μm |
Measurement period | Potential from 10 sec. Titration 5 - 10 min.* |
Potential | ±3000 mV |
Mobility | Max. 14 (μm/s)/(V/cm) |
Reproducibility: - Zeta potential | 2% with standard dispersion |
pH-range | 1 to 14 |
Temperature range | 0°C - 90°C |
Conductivity | up to 350 mS cm-1 |
Sample concentration | up to 40 vol.%* |
Sample volume | from 950 μL** |
Sample type | polar / aquaeous |
Titration: End points | pH, zeta potential, conductivity, volume and time |
Dimensions (WxHxD) | 180x300x260 |
Weight | 8 kg |
Power supply | 100 - 240 V |
Introduction to the StabiSizer DUO analyzer from Colloid Metrix GmbH. The StabiSizer DUO is a combination of the Stabino II and NANO-flex II instruments.