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Powder particle size measurement method and advantages and disadvantages

Release date:2018-04-26  source:粉体网  Browse times:1708
    Commonly used particle size test methods include sieving method, microscope (dynamic/static image) method, sedimentation method, photoresist method, electric resistance method, laser method, electron microscope method, gas permeable method, dynamic light scattering method, X-ray small angle scattering method. Wait.

1) Screening method: advantages: simple, intuitive, low equipment cost, commonly used for samples larger than 40 μm. Disadvantages: The result is greatly affected by human factors and mesh deformation.

2) Microscope (image) method: Advantages: Simple, intuitive, and morphological analysis, suitable for samples with narrow distribution (maximum and minimum particle size ratio less than 10:1). Disadvantages: Poor representativeness, analysis of samples with a wide distribution range is cumbersome, and it is impossible to analyze samples smaller than 1 μm.

3) Settlement method (including gravity sedimentation and centrifugal sedimentation): Advantages: easy operation, continuous operation of the instrument, low price, good accuracy and repeatability, and large test range. Disadvantages: Long test time, cumbersome operation.

4) Resistance method: Advantages: easy to operate, can measure the number of particles, the equivalent concept is clear, the speed is fast, and the accuracy is good. Disadvantages: It is not suitable for measuring particle samples smaller than 0.1 μm, and it is troublesome to replace the small-pore tube with a sample with a wide particle size distribution.

5) Laser method: advantages: easy operation, fast test speed, large test range, good repeatability and accuracy, and can be used for on-line measurement and dry measurement. Disadvantages: The result is greatly affected by the distribution model, the instrument cost is higher, and the resolution is low.

6) Electron microscopy: Advantages: Suitable for testing ultrafine particles or even nanoparticles, with high resolution, and can be used for morphology and structural analysis. Disadvantages: few samples, poor representativeness, measurement is susceptible to human factors, and the instrument is expensive.

7) Photoresist method: Advantages: The test is convenient and fast, and the number of particles in liquid or gas can be measured, and the resolution is high. Disadvantages: It is not suitable for samples with particle size <1μm. The injection system is more stressful. It is only suitable for measuring dust, contaminants or diluted drugs. It is not used for general powders.

8) Breathing method: Advantages: The instrument price is low, and the sample material is not dispersed, and the magnetic material powder can be measured. Disadvantages: only the average particle size value can be obtained, and the particle size distribution cannot be measured; the fine powder of less than 5 μm cannot be measured.

9) X-ray small angle scattering method: used for particle size measurement of nano-sized particles.

10) Photon correlation spectroscopy (dynamic light scattering): for particle size measurement of nanoscale particles.


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