用圆盘离心光透过法测定石墨粒度分布.docx
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1、用圆盘离心光透过法测定石墨粒度分布AbstractA method to measure the particle size distribution of graphite using the disc centrifugal light transmission method is presented. The method involves suspending graphite particles in a liquid with a known refractive index and then placing the suspension in a centrifuge. The
2、centrifuge is then spun at high speeds so that the particles are separated based on their size. A laser beam is passed through the suspension and the transmitted light is measured by a detector positioned at a specific angle. The intensity of transmitted light is found to be proportional to the size
3、 of particles in the suspension. Using this method, we were able to determine the particle size distribution of graphite. Our results show that the graphite particles have a log-normal distribution with a mean diameter of 15 m and a standard deviation of 5 m.IntroductionGraphite is an important indu
4、strial material that is widely used in various applications such as batteries, lubricants, and heat exchangers. The properties of graphite, such as electrical conductivity and thermal stability, depend on the size and shape of its particles. Therefore, determining the particle size distribution of g
5、raphite is essential for optimizing its properties and improving its performance in different applications. The most commonly used methods for measuring particle size distribution are microscopy, sedimentation, and laser diffraction. These methods have some limitations such as complex sample prepara
6、tion, requirement of skilled personnel, and high cost. The disc centrifugal light transmission method is a simple and efficient technique that has been used for many years to measure the particle size distribution of various materials including clay, sand, and polymers. In this study, we apply this
7、method to determine the particle size distribution of graphite.Materials and MethodsMaterials: Graphite samples were obtained from Huzhou Xingxing Carbon Co., Ltd. The samples were sieved to remove any impurities and to obtain particles with a size range of 5-25 m. The refractive index of the liquid
8、 used for the measurement was 1.40.Methods:1. Preparation of the suspension: A suspension was prepared by mixing the graphite particles with the liquid in a ratio of 1:100 by weight. The mixture was then sonicated for 15 minutes to ensure homogeneity.2. Centrifugal separation: The suspension was pla
9、ced in a centrifuge, and the centrifuge was spun at a speed of 6000 rpm for 10 minutes. The centrifugal force separates the particles based on their size, with larger particles being closer to the edge of the centrifuge.3. Light transmission measurement: A laser beam with a wavelength of 632.8 nm wa
10、s passed through the suspension, and the transmitted light was measured by a detector positioned at an angle of 45 to the laser beam. This angle was found to be optimal for detecting the transmitted light intensity.4. Data analysis: The transmitted light intensity was recorded and analyzed using a c
11、omputer software. The particle size distribution was obtained from the intensity curve using the Mie theory and the Fraunhofer diffraction theory.Results and DiscussionThe results of the experiment are shown in Figure 1. The graph shows the intensity of transmitted light as a function of particle si
12、ze. The mean diameter of the particles was found to be 15 m, and the standard deviation was 5 m. The particle size distribution was found to be log-normal, with most particles having a size range of 10-20 m. The particle size distribution obtained using the disc centrifugal light transmission method
13、 was compared with the results obtained using the laser diffraction method. The results were found to be consistent, indicating the reliability and accuracy of the disc centrifugal light transmission method.ConclusionIn summary, the disc centrifugal light transmission method is an efficient and reli
14、able technique for measuring the particle size distribution of graphite. The method is simple, cost-effective, and requires no special skills or equipment. The results show that the particle size distribution of graphite is log-normal, with a mean diameter of 15 m and a standard deviation of 5 m. Th
15、e method can be applied to measure the particle size distribution of other materials, and the results can be used to optimize their properties and applications.The particle size distribution of graphite plays a significant role in determining its characteristics and properties. For instance, smaller
16、 graphite particles have a higher surface area, which leads to better dispersion and stronger bonding in composites. Moreover, the electrical conductivity and thermal stability of graphite depend on the size and shape of its particles. Therefore, determining the particle size distribution of graphit
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- 圆盘 离心 透过 测定 石墨 粒度 分布