Currently Zetasizer more to 500 ~ 700nm wavelength laser as the light source, so that the contact angle, the first community-type particle size analyzer for particle size at 5 ?? m or more accurate results, and for particle size less than 5 ?? m Mie particles is using a mathematical correction. Therefore, the measurement of sub-micron and she nanoscale particles have a certain error Kyowa contact angle, even difficult to accurately measure. For the scattering of laser particle size analyzer, the direct scattering of scattered light information collected for processing, so that she was able to accurately determine the sub-micron and nano-sized particles, while the size of the particles larger than 5 ?? m concerned, scattering Zetasizer you 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, representative, reproducible, 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, import the contact angle, can study the stability of the dispersion system. The disadvantage is not suitable for fast sample size distribution measurement. Around the sol particles, electrostatic attraction due role in the formation of a compact layer of charged, because electrical thermal motion of ions in the outer layer formed close and tight layer of equal magnitude but opposite diffusion layer contact angle measurement, close layer and diffusion layers collectively called electric double layer. In fact, near the solid-liquid interface, there are no electrical double layer structure. Under the external electric field, demonstrated when sol dispersion medium reverse micelles and the potential difference relative movement called ζ potential. Its magnitude and the electrolyte concentration great relationship, if only relative motion ζ potential and medium particles manifested, it is the potential of the close of the difference between the diffusion layer. Germany Delphi contact angle _ ShengDing instrument (certified) _ Wan Jiang contact angle provided by Dongguan Sheng Ding Precision Instrument Company. Dongguan Sheng Ding Precision Instrument Co., Ltd. (www.dgshengding.com) is Dongguan, Guangdong, dedicated instrumentation leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Sheng Ding instrument in leadership with the staff warmly welcome all inquiries negotiations to create ShengDing instrument a better future.