Teilchengrößenverteilung

Teilchengrößenverteilung, often translated as particle size distribution, describes the range of particle sizes present in a powder or granular material and how those sizes are distributed. It is a fundamental property that significantly influences the behavior and performance of many materials across various industries. Understanding and controlling the teilchengrößenverteilung is crucial in fields such as pharmaceuticals, food processing, ceramics, and metallurgy.

The distribution is typically represented graphically, showing the proportion of particles within specific size ranges. Common methods for determining teilchengrößenverteilung include sieve analysis for larger particles, sedimentation techniques like the Andreasen pipette, laser diffraction, and dynamic light scattering for finer particles. Each method has its own range of applicability and principles.

Key parameters used to characterize a teilchengrößenverteilung include the mean particle size, which can be an arithmetic mean, a volumetric mean, or a surface-area mean. Other important descriptors are the standard deviation, which indicates the spread of sizes, and parameters like the d10, d50 (median), and d90 values, representing the particle sizes at which 10%, 50%, and 90% of the material, respectively, is finer. A narrow distribution implies that most particles are of similar size, while a broad distribution indicates a wide variation in particle sizes. This property affects aspects like flowability, packing density, dissolution rates, and reactivity.