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 the contact angle meter in Guangdong on the surface, can not enter the pores. Wetting process and interfacial tension system related. A drop of the liquid level falling on the solid surface, when equilibrium is reached, 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 by its Wetting can be predicted are several situations: 1) when θ = 0, to completely wet; 2) when θ <90 °, part of the wetting or wetting; 3) when θ = 90 °, is whether or not the sub-wetting boundaries; 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, 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 and accurate image analysis method or appearance at around sol particles, due to static gravitational tight layer is formed with a direct charge, because the electrical thermal motion of ions in the outer layer formed close and tight layer of opposite but equal in magnitude Jiangxi diffusion layer contact angle measurement, close layer and a diffusion layer collectively known as electric double layer. In fact, there are solid-liquid interface near any electrical double layer structure. Under the external electric field, showing when the sol reverse micelle dispersion medium and the potential difference relative movement called ζ potential. Its magnitude great relationship with the electrolyte concentration, when ζ potential of particles with medium only relative movement manifested, it is closely layer and the potential difference between the diffusion layer. Sheng Ding instrument (Figure) _ _ Yunnan contact angle measurement contact angle measurement provided by Dongguan 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!