Mobile phones droplets goniometer | droplets angle (certified) | droplets 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. Droplet height / width method is an overall drop method. When accounting consider is the shape of the entire droplet generalization, not part of, so when the shape of the droplet was disturbed when another object, such as a needle placed in the droplets, it will affect the accuracy of the approach, and even longer apply. 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 ° AF drip angle measurement ShengDing, the solid is repellent, that is non-wetting liquid solid, easy to move on the surface, 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 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 or directly with an accurate shape image analysis method. Principle shape image analysis method for the liquid drops on the surface of a solid sample, the droplet shape image obtained by the lens of the microscope and the camera, then the use of digital image processing algorithms, and some of the images The contact angle of a droplet is calculated. The contact angle is usually calculated based on a specific mathematical model can be regarded as the ball drops or conical part of droplets corner, then by measuring specific parameters such as width / height or directly through fitting calculated contact angle values. Young-Laplace equation describes the interface within a closed relationship between the pressure difference between the curvature of the outer interface and interfacial tension can be used to accurately describe an axis of symmetry of the droplets of water droplets wetting angle contour angle measurement ShengDing, thus calculate the contact angle. Mass spectrometry (mass? Spectrometry) particle beam mass spectrometer measurements of key terms for the size of aerosol particles. Currently, there are several research groups engaged in foreign Mass Spectrometry Determination of particle mass and size, and the research methods and technical route vary. However, the basic principle is the determination of particle kinetic energy and green mU2 brought charges / (2Ze), particle velocity U and charge number Z, to obtain particle mass m, combined with the particle shape and density of the particle size can be obtained. Aerosol samples were first formed in the entrance to the particle beam, and then the differential pressure system into the high vacuum region, with a high vacuum region in the electron currents will tell ionizing particle beam, and then detected using an electrostatic energy molecular kinetic energy particles and particles The specific charge, with the quality and speed of the particle size distribution of the particles in a smile. Determination of the particle size range of mass spectrometry is generally 1 ~ 50nm.