partikelstorleksfördelningar

Particle size, a fundamental material property, describes the dimensions of individual particles. In Swedish, the term partikelstorlek corresponds to this concept. The size range spans from nanometers to millimeters and is typically described by a size distribution rather than a single value. Particle size influences properties such as surface area, reactivity, optical behavior, and sedimentation, and it is a key parameter in fields ranging from pharmacology to materials science.

Common measurement methods include dynamic light scattering (DLS) for submicron particles, electron microscopy (SEM/TEM) for direct imaging, sieve analysis for larger particles, laser diffraction for broad size ranges, and Coulter counter techniques for count-based data. The choice of method depends on the size range, particle type, and whether a number, volume, or intensity distribution is required. Results can be affected by sample state, dispersion quality, and measurement conditions, so multiple techniques are often used for confirmation.

Data are typically presented as particle size distributions with descriptors such as D10, D50 (median), and D90, or as mean sizes calculated by volume, number, or intensity weighting. The polydispersity index (PDI) or similar metrics quantify distribution breadth. In pharmaceutical formulations, particle size directly affects dissolution rate, stability, and bioavailability; in coatings, pigments, catalysts, and composites, it influences packing, reactivity, and mechanical properties.

Standardization and interpretation require careful attention to units, calibration, and reporting conventions. Proper sample preparation is crucial to avoid agglomeration and to obtain representative measurements. Understanding particle size and its distribution supports predictions about processing behavior, performance, and end-use characteristics across applications.