And Accuracy - Discussion on Two Measurement Methods for Zeta Potential

There is a short novel about surveying. The story is about a farm that mainly measures the length of the field embankment and hires two skilled surveyors. One uses the "traditional method" - hemp rope, tape measure, and calculator, while the other uses a laser rangefinder. The former measured a data of "103.2 meters", while the latter measured a number of "94.563 meters". Finally, the farmer used a laser rangefinder to measure the numbers. The measurer who used the "traditional method" said before leaving, "Although I didn't measure more than him, my conclusion is more accurate than his

The microelectrophoresis (zeta potential meter) developed and produced by Shanghai Zhongchen Digital Technology Equipment Co., Ltd. adopts video measurement technology. Based on the unit time displacement of charged particles in the dispersed system under the action of electric field switching, the image of charged particles is automatically captured and enhanced. The software analyzes the displacement pixels and automatically calculates their electrophoretic mobility and zeta potential, and can accurately observe the particle size. Due to the fact that the entire analysis process is' what you see is what you get ', which is equivalent to an upgraded version of the' traditional method 'in the story, the data must be accurate and it is difficult to make mistakes.

The zeta potential and particle size analysis instruments produced by instrument companies basically use laser diffraction measurement technology, which is fast and accurate. However, when the particle size is as small as a few hundred nanometers, its diffraction intensity almost loses its dependence on angle, and in the ISO13320 standard, it is specifically proposed that if the particle size is less than tens of micrometers, the Mie theory should be used to input the correct sample refractive index and absorption index in order to obtain more accurate results. ”It can be seen from the October 2009 issue of "Instrument News" that although this type of instrument measures numbers, it may not be accurate in some environments.

The microelectrophoresis (zeta potential meter) is mainly used to measure the zeta potential of charged particles in dispersed systems, and is widely used in modern scientific research and production fields. For example, in the treatment of industrial wastewater and river drinking water, we hope to add coagulants that make the water dispersion system highly unstable, and the charged particles in the water dispersion system agglomerate into large clusters and settle, thereby obtaining clean water bodies. On the contrary, in the paper industry, we hope to adjust the pulp environment to make the pulp dispersion system tend to be very stable, and the charged particles in the pulp dispersion system are dispersed as extremely small particles, thereby obtaining smooth and shiny paper.

The microelectrophoresis (zeta potential meter) developed and produced by Shanghai Zhongchen Digital Technology Equipment Co., Ltd. is accurate in measurement results due to the use of video measurement technology; At present, the lower limit for measuring particle size is 100 nanometers, and the particle size of charged particles can only be observed and measured one by one. The zeta potential and particle size analysis instruments produced by instrument companies basically use laser diffraction measurement technology, but the measurement results are not accurate in some environments. Its advantage is that it can quickly measure the histogram of particle size distribution in the entire dispersion system.

In summary, our conclusion is that video measurement technology has significant advantages in the reliability of zeta measurement and observation measurement of charged particle monomers, while laser diffraction measurement technology has significant advantages in calculating the histogram of particle size distribution in the entire dispersion system, with both having their own strengths.