Polarity is measured in a pulsed electric field, while mobility is measured in a high frequency sine wave electric field excitation. Two probes are used, one to determine the polarity of the particle charge at the slipping plane and one to measure the mobility of the particles in an electric field. The optical probe surface is coated to provide electrical contact with the sample. The backscatter and laser amplified detection signals are collected as in the size measurement, and the rapid sequencing of applied electric fields prevents electroosmosis. The same stable optics sample interface means no adjustments are required.
The measurement of zeta potential in the NANOTRAC WAVE II particle size analyzer takes advantage of the same Frequency Power Spectrum methodology used for measuring nanoparticle size distributions. Sample cells listed for the Wave II are also compatible with the zeta model. The Nanotrac Wave II Zeta particle analyzer has a special reusable zeta cell with an electrode for running zeta potential measurements.
There are cuvettes available in polystyrene, glass, and stainless steel in sizes ranging from 50 µl to 3 ml. The Nanotrac Wave II Q particle analyzer also has a variety of standard cuvette sizes to accommodate many different types of materials. For more difficult to clean samples, there is a standard volume stainless steel cell, as well as a large volume stainless steel cell. There is a standard and micro volume Teflon cell for a wide range of materials. The Nanotrac Wave II particle analyzer has multiple reusable samples cells in different sizes. It is also possible to calculate the molecular weight by either the hydrodynamic radius or a Debye plot. Depending on the distribution calculation, concentration will be displayed in appropriate units such as cm 3/ml or N/ml. The Nanotrac Wave II series can also calculate the sample concentration through the use of the power spectrum and the resulting loading index.
Utilizing our Laser Amplified Detection method, repeatable and stable particle size measurements for all types of materials are provided. All Nanotrac Wave II series analyzers use the same revolutionary probe technology for DLS measurements.
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