Determination of particle size distribution of porous materials by sedimentation method

The particle size distribution analysis using the sedimentation method relies on Stokes' law, which describes the settling velocity of particles in a liquid. As particles settle, their rate of sedimentation is directly influenced by their size. By measuring this settling speed in a liquid with known properties, we can determine the particle size distribution of the sample. However, for porous materials, the particle size distribution calculated via Stokes’ law depends on the skeletal density of the particles. Therefore, accurately determining the particle size distribution of porous materials requires considering their skeletal density. In this study, the particle sizes of Si-Al and aluminum hydroxide powders were measured using an X-ray sedimentation particle size analyzer from Mike Instruments, USA. The results showed that when testing Si-Al (a porous material), using different densities—such as bulk density versus skeletal density—led to significantly different particle size distribution outcomes. For aluminum hydroxide powder, calcination introduces a pore structure, and using the correct skeletal density during testing allowed for accurate comparison of particle size distributions before and after pore formation. To ensure consistency and reliability in measurements, it's essential to use the appropriate density value. Failing to do so may result in discrepancies between pre- and post-calcination results. This highlights the importance of understanding the material’s physical properties when applying sedimentation-based techniques for particle size analysis. The experimental data presented here further emphasizes the impact of skeletal density on the accuracy of sedimentation methods for porous materials.

Pet Teeth Cleaning Finger Wipes

Pet Teeth Cleaning Finger Wipes,Tooth Cleaning Wipe Dog,Tooth Cleaning Wipe Cats,Dogs Cats Tooth Cleaning

ShangHai Youhang Technology Co.,LTD , https://www.yhecoclean.com