Mass spectrometry (mass? Spectrometry) particle beam mass spectrometer measurements of key terms for the size of aerosol particles. Currently contact angle measurement standard piece, abroad several research groups engaged in mass spectrometry determination of particle mass and particle research, and research methods and technical route vary. However, the basic principle is the determination of particle kinetic energy and green mU2 brought charges / (2Ze), particle velocity U and charge number Z, to obtain particle mass m, combined with the particle shape and density of the particle size can be obtained. Aerosol samples were first formed in the entrance to the particle beam, and then the differential pressure system into the high vacuum region, with a high vacuum region in the electron currents will tell ionizing particle beam, and then detected using an electrostatic energy molecular kinetic energy particles and particles The specific charge, with the quality and speed of the particle size distribution of the particles in a smile. Determination of the particle size range of mass spectrometry is generally 1 ~ 50nm. For the size of nanomaterials systems analysis, we must first distinguish the size of a particle or a secondary particle analysis. Due to the strong inter-particle nanomaterials self-absorption properties, aggregates of nanoparticles is inevitable, monodisperse system is very rare, both very different. Visually observing the contact angle an analysis granularity mainly used electron microscopy, according to the size range required and sample contact angle standard sample droplets angle standards, may in turn by scanning electron microscopy (SEM), transmission electron microscopy (TEM), scanning tunneling microscope (STM) , atomic force microscopy (AFM) observation and intuitive to get the original particle size and morphology of individual particles. Since the electron microscope method is locally observed region, therefore, when performing the particle size distribution analysis, the observation requires numerous photos contact angle measurement calibration sheet, obtained by the statistical software analysis particle size distribution. Particle size analysis electron microscope in order to get the results are generally representative of the distribution of the actual sample is hard particles, for some in the strong electron beam instability and even decomposition of micro-nano particles, sample preparation difficult biological particles, microemulsion and other samples are hard to come by accurate results. Therefore, the test results are usually followed by the particle size analysis methods as a contrast to other results. Contact angle measurement standard, contact angle, ShengDing instruments 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!