Application Note: Particle Size Determination Of Porous Powders Using The SediGraph
Source: Micromeritics Instrument Corporation
Sedimentation analysis based upon Stokes' Law provides a convenient method for determining particle size distribution (PSD). A single solid (or nonporous) sphere settling in a fluid has a terminal settling velocity which is uniquely related to its diameter. The SediGraph determines particle size distributions using the sedimentation method. By measuring the gravity-induced settling velocities of different size particles in a liquid with known properties, the particle sizes are determined. The rate at which nonporous particles fall through a liquid is described by Stokes' Law.
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