For quality control or formulation of colloidal material such as e.g. dyes or paints a measurement procedure is required that can make precise and reliable statements about the stability of dispersions within a short time. This guarantees industrial processes leading to effectively and inexpensively optimized products.

A well-known measure of the stability behavior of dispersions and nanoparticles are particle interface potentials, such as the zeta potential. By measuring the flow potential generated by the charge separation of the fluid, one obtains information about the zeta potential. The determination of the particle size is another way to investigate a process in order to obtain reliable statements about the stability behavior. The particle size distribution is determined by means of DLS 180 ° dynamic light scattering.

The StabiSizer® by Colloid Metrix provides very fast, accurate and reproducible particle charge and particle size distribution measurements. It is able to measure the surface charge of particles in the range of 0.3 nm to 300 μm and the size distribution of 0.3 nm to 10 μm, at a concentration range of up to 40% vol. Due to the optimized measuring technology, the StabiSizer® can determine 7 parameters simultaneously and within a few seconds:

  • particle size distribution
  • zeta potential
  • streaming potential
  • conductivity
  • pH value
  • temperature
  • concentration

The StabiSizer® has two built-in titration pumps whose titration speed can be set as required with the software. The determination of the isoelectric point is one of the possibilities of titration and is determined within a few minutes.

Your titration applications with simultaneous particle size monitoring:

pH titration: Determination of the isoelectric point and stable pH ranges.

Polyelectrolyte titration: Statements about the stability and charge density.

Titration with dispersant: For dispersant optimization.

Titration with salts: Zeta potential as a function of the conductivity.

Formulation: Titration with additives to obtain the optimum in the formulation of your products.

In-situ size distribution:
You are not only interested in the surface charge of your sample but also want to determine the particle size distribution?
With the StabiSizer® the size distribution can either be determined stand-alone or can be tracked e.g. during a charge titration. The coagulation becomes "visible" in situ by the particle size and it is possible to identify the critical agglomeration point of a sample. This is especially helpful to assess colloidal systems even more.

7 measurement parameters simultaneously:
To determine the quality of your samples, you need more than just one measurement parameter?
With each measuring point, the StabiSizer® provides information about the particle size distribution, conductivity, zeta potential, streaming potential, temperature, pH and concentration of your sample.

Measuring during the titration:
With the StabiSizer® software, your entire titration or measurement can be tracked in real time, because for each titrated droplet you will receive a measuring point in the graph including all measurement parameters.

Easy operation:
To focus only on the results, the software has been made as easy-to-use as possible. Just pour in 1 - 10 mL sample into the Teflon beaker of the StabiSizer®, open the software and start the measurement.

Fast measuring time:
Most known analytical systems are based on electrophoresis zeta potential, with which titrations are often too inaccurate and too time consuming. For a high sample throughput and thus valuable time savings the StabiSizer® was optimized so that the parameters required for e.g. quality assurance or formulation can be determined within seconds. For a polyelectrolyte or pH titration the StabiSizer® takes approx. 5 - 15 minutes and generates several hundreds of data points.

Adapted titration speed:
The titration speed of the StabiSizer® can be adjusted to the reaction rate of your sample. For this the software offers the possibility to define standard operating procedures (SOPs) as desired.

"Mix and Measure" - a huge advantage:
Due to the continuous and rapid mixing of the sample and the titration solution, a charge titration is completed in minutes and additionally prevents sedimentation.

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Rapid pH-Titration
Rapid Polyelectrolyte Titration
Rapid Conductivity Titration
All Titrations simultaneously with Size
The Duo Stabino® / NANO-flex®

26.03.2014