Vacuum contact angle measurement | ShengDing instrument (certified) | contact angle provided by Dongguan Sheng Ding Precision Instrument Company. Dongguan Sheng Ding Precision Instrument Co., Ltd. (www.dgshengding.com) is specialized in the "contact angle measurement, tensile tester, drop angle detector, surface and interface equipment, mold Monitor" of the enterprise, the company of "honesty, hard service "concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Mr. The contact angle is defined as the gas, liquid and solid at the intersection by gas - liquid interface tangent solid - liquid boundary line between the angle θ is a measure of the degree of wetting. If θ90 °, then the solid is liquid repellent, i.e., the liquid does not wet the solid, easy to move on the surface, can not enter the pores. Wetting process and interfacial tension system related. Level drop of liquid falling on the solid surface, when equilibrium is reached, subject to the following contact angle formed between each of the interfacial tension and Young's equation (Young Equation): γs, g = γs, l + γg, l × cosθ by it Wetting can predict the following several situations: 1) when θ = 0, completely wetted; 2) when θ <90 °, partial wetting or wetting; 3) when the contact angle θ = 90 °, a wetting or not The dividing line; 4) when θ> 90 °, non-wetting; 5) when θ = 180 ° powder contact angle measurement, totally non-wetting. A capillary phenomenon in the liquid rise and fall height h. h represents the positive and negative rising or falling. Infiltration of liquid rises, the contact angle is an acute angle; non-wetting liquid temperature decreased contact angle measurement, the contact angle is an obtuse angle. Rising height h = 2 * surface tension coefficient / (liquid density * g * level of gravity radius R). Rising height h = 2 * surface tension coefficient * cos contact angle / (liquid density * gravitational acceleration g * capillary radius r). Wetting problem and 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 weighing 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 direct and accurate image analysis or shape. For size nanomaterials systems analysis, we must first distinguish between a particle or a secondary particle size of the particles were analyzed. Due to the strong inter-particle nanomaterials self-absorption properties, aggregates of nanoparticles is inevitable, monodisperse system is very rare for mobile phones contact angle instrument, both very different. An analysis granularity mainly electron microscopy intuitive observation, according to the size range required and the sample can be followed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), scanning tunneling microscope (STM), atomic force microscopy (AFM) observation and intuitive to get single primary particle size and morphology of the particles. Because electron microscopy area is locally observed, so, during the particle size distribution analysis, require the observation of numerous photos, particle size distribution obtained by software analysis statistics. 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.