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Thursday, February 20 • 2:00pm - 2:30pm
New Development for Zeta Potential Measurement of Coatings for Stability Characterization - DataPhysics

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A new device for measuring zeta potential of coatings was recently developed by DataPhysics Instruments in collaboration with Leibniz Institute of Polymer Research Dresden (IPF).  Zeta potential is a measure of the electrical potential at the interface between a solid surface and a liquid, and is an important indicator of the stability of colloidal dispersions.  In a dispersion, the magnitude of the zeta potential provides an indication of the degree of electrostatic repulsion between adjacent, similarly charged particles.  When the particles or molecules are small enough, a high zeta potential will indicate a greater stability and the dispersion will resist aggregation.  A lower zeta potential means that attractive forces between particles may be stronger than repulsive forces, causing the dispersion to break apart and flocculate.  Thus, colloids with a higher zeta potential (negative or positive) are electrically stabilized while colloids with lower zeta potential tend to coagulate or flocculate.
For some years now, IPF has been recognized as a leader in the study of zeta potential measurements related to colloidal systems, the characterization of electrical properties of surfaces, and in the monitoring of chemical reactions. IPF has generated significant ideas for improvement of these test methods and for major enhancements in commercial zeta potential instruments. The unique, new device described in this paper uses the streaming potential principle for electro-kinetic measurements and for the first time, uses innovative bidirectional pressure cycles created with an oscillatory pump. This novel approach yields higher stability of the zeta potential measurements by employing twenty (20) pressure cycles per measurement compared to the traditional four (4) cycles. The new device also includes both temperature control and allows for purging of the sample chamber with inert gas. The teamwork of IPF scientists and expert engineers from DataPhysics Instruments has resulted in a zeta potential device with greatly improved capabilities for broad range of applications including characterization of the stability of coatings.

avatar for Paul Simutis

Paul Simutis

Technical Service & Applications Manager, DataPhysics Instruments USA
Paul Simutis has received master’s degree in chemistry from Vilnius University in Lithuania. After graduation Paul worked in chemistry related industry. He has worked with instruments for studying surfaces and interfaces over 10 years and helped many scientists in different companies... Read More →

Thursday February 20, 2020 2:00pm - 2:30pm
Rhythms II-III

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