German standard angle of water droplets, ShengDing instrument (certified), drop angle provided by the 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. Dirty clothes - grease, the surface tension of his large, insoluble in water, detergent enable him to reduce the surface tension of water droplets angle, which is soluble in water, so water can wash the dirt from the clothes. Because of surfactants in detergents with. Surfactants reduce the surface tension of water, why we have added detergent in ordinary water can blow bubbles? Because surfactants reduce the surface tension of water, the water is easy to blistering. Detergent molecule is very interesting, one end is a hydrophilic group, can be dissolved in water, the other side is a lipophilic group, can be dissolved in oil. When the laundry, if there is oil, detergent clothes lipophilic group will work with the oil "huddled" hydrophilic groups on the outside. Such hydrophilic group and the water is very close, it is easy to lipophilic conjugates with oil away. Plus many foam decontamination ability. Now there are many detergent additives, the removal of other stains. Surface tension is what humans do not seem to us very useful, but the pond insects but can run around in the water, because water has a surface tension. The famous Tiger Spring Floating coin contact angle calibration, but also because a large surface tension. The so-called contact angle measurement touch angle refers to drop on a solid horizontal plane of a droplet on a solid surface solid - liquid - gas three-phase border point, the gas - liquid interface and solid - liquid interface of two tangents to liquid sandwiched therebetween when the angle formed. Contact angle measurement is mainly used for measuring liquid solid angle of touch, that liquid to solid wettability, contact angle measurement instrument can measure all kinds of information on a variety of liquid touch angle. Touch angle measurement for oil, printing and dyeing, pharmaceutical, coating, dressing and other professional research and production has a very important effect. Measuring the contact angle measurement principle: when the droplet freely in space without affecting the force field, because of the presence of interfacial tension and cylindrical ball. However, when droplets with a solid plane touch, which ultimately depends on the relative size of the shape of the droplet adhesion internal cohesion between the solid and liquid droplets. When a droplet placed on a solid plane, liquid droplets on a solid surface can automatically start to shop, or to the solid surface into a touch-angle droplets must exist. Statistical analysis of secondary particle size of nanomaterials particle system, according to the principle of division of the more advanced three typical methods are: high-speed centrifugal sedimentation method, laser particle size analysis and particle size analysis of ultrasonic power. Laser particle size analysis focused their analysis of different particle size ranges, it is divided into light diffraction and dynamic light scattering. Diffraction mainly for micron, submicron particles; scattering law aimed at nanometer particle size analysis of submicron particles. Electric ultrasonic particle size analysis method is the latest in analytical methods, mainly grain size analysis of high concentration system. Particle size analysis of the characteristics of nanomaterials are more droplets angle data analysis method calibration, high concentrations of the main analysis of the system size. Particle size analysis of the characteristics of nanomaterials are more droplets angle calibration analysis piece, get the equivalent diameter, horizontal comparison is not between each other. Each analysis methods are applicable to a certain range, and sample conditions, should choose the appropriate analysis method based on the actual situation.