Zeta Potential And Particle Size Standard Substance In Liquid

The particle size,Zeta potential and concentration of nano/submicron particles in the liquid are the key control parameters in the process of preparation and application of the colloidal system.The accurate measurement of these parameters is related to the success or failure of scientific research,industrial production,and application of the product.At present,there are many instruments for measuring the physicochemical parameters of nanoparticles,and it is necessary to use relevant measurement standards to carry out traceability of measurement values to ensure the reliability of the measurement results,thereby supporting the healthy and rapid development of related industries in China.For example,the measurement principles and data processing methods of commercial Zeta potentiometers are different,and there are many influencing factors.Therefore,the standard materials become the main traceability standards for method verification and instrument calibration;another example: due to the charged behavior of particle surfaces in liquids.The dynamic light scattering particle size analyzer measurement result is not the physical diameter but the hydration kinetic diameter,resulting in a difference with the electron microscope measurement results.In view of the above reasons,the dynamic light scattering particle size analyzer's quantitative verification needs to be used.Hydration kinetics standard substance.Another example: In the field of cleanliness,there is a clear limit on the particle concentration of a certain particle size range(such as >100nm particle concentration),while the liquid particle counter,dust particle counter,aerosol particle size spectrometer particle size calibration and reliable Sex requires a specific peak particle size standard substance.However,due to the absence of reference materials for Zeta potential and particle size standards(specified peak-size reference material,hydrated-dynamic particle size reference material)in China,calibration of the current instrument can only rely on calibrators supplied by foreign manufacturers.The reliability cannot be effectively guaranteed or can not meet the actual calibration requirements,which seriously restricts the development of related industries in China.In view of the above technical status,the study of Zeta potential reference materials and particle size reference materials(specific peak particle size standard materials,hydrated kinetic particle size standard materials)was carried out.Through the systematic research of synthetic technology,polystyrene particles samples with different particle sizes and different charge densities were prepared,and the stability preservation technology of polystyrene particles samples was researched,and finally a specific peak particle size standard material candidate and Zeta potential were obtained.Candidates for standard substances and candidates for hydration kinetics standard substances;followed by studies on Zeta potentials,hydration kinetics particle size measurement techniques,and reference material valuation techniques.The calibration techniques of electrophoretic light scattering and image analysis methods were respectively developed to enable the measurement results of the two instruments to be traceable to relevant measurement standards in China.The results showed that the Zeta potential and the hydration kinetic particle size setting results of the two methods are very good.Consistency.Based on this work,seven kinds of specific peak particle size standard material candidates in the range of 70 nm to 500 nm were finally developed;two kinds of hydration kinetics standard materials with nominal values of 100 nm and 300 nm were developed;two kinds of zeta potential standards were developed.Substances have a range of(-30 mV to-40 mV)and(-55 mV to-65 mV).