The working Principle of the Particle charge analyzer （PCA）
Release time:2025.11.24
The Working Principle of the Particle Charge Analyzer
The particle charge analyzer is an instrument used to measure the surface charge of particles. Here is a detailed introduction to it:
Working Principle
Streaming Current Method: The measuring cell in the instrument usually consists of a precision cylinder with a closed bottom and contains two electrodes, one at the bottom and the other at the upper electrode. The electrodes are connected to contacts extending from the lower front of the instrument housing. The measuring cell is designed as a container to allow the sample to be poured from the top. A precision piston vibrates up and down in the cylinder at a frequency of about 4Hz. A polyelectrolyte or coagulant is used as a titrant to determine the charge demand of the sample. Colloidal particles temporarily adhere to the piston and cylinder walls, and due to the partial charge distribution measured between the two electrodes, the mobile counterions of the fixed electrolyte move through the liquid stream to generate an electric current, which is measured by the electronics in the main unit. (Bebur Labsense Laboratory Particle Charge Analyzer adopt Streaming Current Method)
Electrophoretic Kinetic Principle: The particle surface charge is calculated by measuring the migration speed of the particles under the action of an electric field. When particles move in an electric field, the surface charge of the particles interacts with the electric field, generating a resistance, making the migration speed of the particles proportional to the electric field strength. By measuring the migration speed and electric field strength of the particles, the absolute value of the surface charge and the charge density of the particles can be calculated.
Coulomb impedance principle: When particles pass through a tiny capillary filled with electrolyte, electrophoresis occurs under the action of the electric field. By measuring the change in current when the particles pass through the capillary, the particle size and potential of the particles can be calculated.
Main types and features
- Zeta potential analyzer: It can measure the Zeta potential of particles in a suspension, thereby inferring the charged state and stability of the particle surface. It can also evaluate the size distribution of particles through light scattering technology, and accurately evaluate the morphology, concentration and stability of particles. It has the characteristics of high precision, high sensitivity, easy operation and good stability, and is suitable for many fields such as nanomaterials, biomedicine, and environmental protection.
- PCD Particle Charge Analyzer: It mainly uses the streaming potential method and the standard titration method to detect the surface charge density of particles. It is often used in papermaking, water treatment and other industries. It is a standard tool for detecting the content of anionic garbage and the charge of chemical additives.
- PCA Particle Charge Analyzer: Based on the streaming current measurement technology, it can quickly and accurately measure the ion and colloid charge in the aqueous solution sample, directly display the polarity and charge of the sample, and quickly determine the charge demand and the optimal amount of chemical addition. It has the advantages of convenient and fast use and is often used in water treatment, papermaking, wastewater, chemical industry and other industries.
Application Field
- Papermaking Industry: It is used to detect the content of anionic garbage and determine the charge of chemical additives, so as to optimize the amount of chemical addition in the papermaking process and improve paper quality and production efficiency.
- Water Treatment Industry: It can quickly determine the charge demand and the optimal amount of chemical addition in the water sample, such as the amount of flocculant added, to improve the water treatment effect and reduce the treatment cost. It can also be used to monitor the surface charge characteristics of pollutants and suspended particles in the water body, and provide a basis for the optimization of water treatment process.
- Materials science: Study the surface modification and surface properties of particles to optimize the performance of materials. For example, in the research and development of nanomaterials, accurate measurement of the surface charge of nanoparticles helps to understand their stability, dispersibility and interaction with other substances in the medium, and provides a scientific basis for the performance optimization of nanomaterials.
- Environmental science: Monitor nanoparticle pollution in water and soil, evaluate their environmental behavior and ecological risks, and can also be used to study the surface charge characteristics of atmospheric particles to provide a reference for air pollution prevention and control.
- Biomedicine: Study the surface charge of biological particles to reveal the interaction between biological molecules. It is often used to study the stability of microparticle drug delivery systems and nanomedicines, and optimize the delivery efficiency and efficacy of drugs.
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