The contact angle is defined as the gas, liquid and solid at the intersection by gas - liquid interface tangent and solid - liquid junction angle θ between the lines, is a measure of the degree of wetting. If θ90 °, then the solid is liquid repellent, the liquid does not wet the solid that is easy to move on the surface and can not enter the pores. Wetting process and interfacial tension system related. A drop of the liquid level falling on the solid surface, when the equilibrium contact angle meter Jiangxi, subject to the following contact angle formed between each of the interfacial tension and the Young's equation (Young Equation): γs, g = γs, l + γg, l × cosθ can be predicted by its wetting following several situations: 1) when θ = 0, to completely wet; 2) when θ <90 °, part of the wetting or wetting; 3) when θ = 90 °, the run Wet or not the boundary; and 4) when θ> 90 °, non-wetting; 5) When θ = 180 °, completely non-wetting. A capillary phenomenon of the liquid rising, falling height h. h represents the sign of the rise or fall. Infiltration of liquid rises, the contact angle is an acute angle; non-wetting liquid drop contact angle measurement instrument, the contact angle is an obtuse angle. Rising height h = 2 * surface tension coefficient / (liquid density * gravitational acceleration g * surface radius R). Rising height h = 2 * surface tension coefficient * cos contact angle / (liquid density * gravitational acceleration g * capillary radius r). Wettability problems with mining flotation, oil, textile, pesticide processing, photographic film production, as well as waterproof paint formulations, washing and so closely related. The contact angle of existing test methods are usually two: one for the shape of the image analysis method; the other for the gravimetric method which is often referred to as a wetting balance or osmosis contact angle meter, but the most widely used, the measured value is best or directly with the outer-shape image and accurate analysis in the analysis and the study of nanomaterials, the nanoparticles are often referred to frequently encountered particle size nanometers (1 ~ 100nm) of the ultrafine particles. Since the particle size of such materials for nanoscale, itself has a small effect, quantum size effect, surface effect and macroscopic quantum tunneling effect, it has many conventional materials do not have the characteristics, catalysis, nonlinear optics, magnetic materials , aspects of medicine and new materials have broad application prospects. Therefore, the particle size of nanomaterials, distribution, has an important impact on the performance of the medium dispersion properties and morphology of the secondary particles gathered nanomaterials, therefore, particle size analysis of nanomaterials is an important aspect of nanomaterials research. Also due to the nature and importance of nanomaterials, and promote the development of particle size analysis and characterization methods and techniques, particle size analysis of nanomaterials has become an important area of ??modern particle size analysis. Currently, particle size analysis of nanomaterials are many kinds of methods and instruments Yunnan contact angle measurement, but due to a variety of analytical methods and instrumentation design for the system to be analyzed has some relevance, analysis principles and methods used vary, so Select the appropriate analytical methods and analytical instruments is very important. And because the physical basis of a variety of different methods of particle size analysis Fujian contact angle measurement, the physical meaning of the same sample obtained with different methods of measurement of particle size and even particle size is also different. In addition, the use of different particle size analysis methods are also different. If the system of analytical instruments and test results do not accurately understand and grasp, the resulting molecules tend to have large differences in actual results, does not have the scientific and representative. Therefore, according to the measured object, measuring method of measuring accuracy and measuring accuracy is very important to select and necessary. Fujian contact angle measurement, contact angle measurement, ShengDing instrument (View) provided by the Dongguan City Sheng Ding Precision Instrument Co., Ltd .. "Contact angle measurement, tensile tester, drop angle detector, tables, interface equipment" preferred Dongguan Ding Sheng Precision Instrument Co., Ltd. (2), the company is located in: Road Town cross by the 2nd cross by Xin'an Road, Dongguan City, years come, Sheng Ding instrument to provide customers the best quality service, Contact: Mr. Welcome to the new and old customers call, letter, visit the guide, business negotiations. Sheng Ding instrument expect to be your long term partner!