Currently Zetasizer more to 500 ~ 700nm wavelength laser as the light source, therefore, the first community-type particle size analyzer for particle size at 5 ?? m or more accurate results, but for less than 5 ?? m diameter particles Michaelis is using a mathematical correction. Therefore, the measurement of sub-micron and she nanoparticles have some errors, even difficult to accurately measure. For the scattering of laser particle size analyzer, the direct scattering of scattered light information collected for processing plant sales contact angle, so she was able to accurately determine the sub-micron and nano-sized particles, and particles of size greater than 5 ?? m to said scattering laser particle size analyzer can not come up with accurate measurements. Laser light scattering method can measure the particle size distribution of 20 ~ 3500nm, access to the equivalent spherical volume distribution, measurement accuracy, speed and the contact angle of retail, strong representative contact angle where the good, good reproducibility, suitable for measuring the mixed materials. The disadvantage is the requirement for the high detector, compare the difference between each measurement instrument. Photon correlation spectroscopy method can measure the range of 1 ~ 3000nm particle size distribution, particularly suitable for ultra-fine particle size analysis of nanomaterials. Measuring the volume of distribution, high accuracy, high speed, wide dynamic range, you can study the stability of the dispersion system. The disadvantage is not suitable for fast sample size distribution measurement. Photon Correlation Spectroscopy (photon correlation spectroscopy) by dynamic light scattering (dynamic light scattering) when the particle size is smaller than the wavelength of light, the Rayleigh scattering theory, relative angular intensity of scattered light regardless of the particle size distribution of the contact angle, can not by Spatial distribution of scattered light intensity (i.e., the above-described static scattering method) to determine the particle size, dynamic light scattering has made up for in this, it will scatter a certain frequency shift of the scattered light, scattered light at a certain point in space to form an interference, the point light intensity decay time correlation function has a particle size with particle one to one relationship. By detecting the scattered light intensity changes with time, and the correlation operation the size of the particle size can be drawn. Nevertheless, the obtained dynamic light scattering average particle diameter of the particles is difficult to obtain a particle size distribution parameter. Dynamic light scattering method is adapted to detect submicron particles, measuring range 1nm ~ 5? M. The contact angle where the good _ _ ShengDing contact angle instrument provided by the Dongguan Sheng Ding Precision Instrument Company. Dongguan Sheng Ding Precision Instrument Co., Ltd. (www.dgshengding.com) strong, credible, in Dongguan, Guangdong specialized instrumentation industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead ShengDing instrument and you hand into the brilliant, for a better future!