Droplet height / width method is an overall drop method. When consideration is summarized accounting entire droplet shape is not part of, so when the shape of the droplet was disturbed when other objects, such as needles placed inside the droplet contact angle measurement, it will affect the way of accuracy, even no longer applies. The contact angle refers to the gas in the gas, liquid and solid at the intersection made - the tangent to the solid-liquid interface - the angle θ between the liquid boundary line between the water contact angle measurement, 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. 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 an accurate shape of the image analysis method. Principle of the shape of the image analysis method, the liquid drops on the surface of a solid sample, the shape of the droplets to obtain an image with the camera through the lens of the microscope, then the use of digital image processing algorithms, and some of the images The method of contact angle of droplets calculated calculation of the contact angle is usually based on a specific mathematical models such as the droplet can be regarded as part of the ball or conical, and then by measuring specific parameters such as width / height or by directly fitting to the calculated value of the contact angle. Young-Laplace equation describes the interface in a closed, the pressure difference between the outer curvature of the interface the interfacial tension and the relationship between the contact angle meter factory pin can be used to describe a liquid droplet axisymmetric contours accurately to calculate its The contact angle. Photon Correlation Spectroscopy (photon correlation spectroscopy) dynamic light scattering method (dynamic light scattering) when the particle size of less than optical wavelengths, from Rayleigh scattering theory, the angular distribution of the particle size and the relative intensity of the scattered light is independent of the scattered light can not pass through Spatial distribution of intensity (i.e., a static scattering method described above) to determine the particle size by dynamic light scattering in the make up of 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 intensity of the point decay time of the correlation function has a particle size and a particle-one correspondence relationship. By detecting the scattered light intensity changes with time, and the particle size of the correlation calculation can be derived size. 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. Water contact angle measurement | ShengDing equipment (certified) | Xinyi contact angle measurement 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!