Hiukkaskokojakaumakäyrä

Hiukkaskokojakaumakäyrä, often translated as particle size distribution curve, is a graphical representation that illustrates the range of particle sizes present in a sample and their relative proportions. This curve is essential in many scientific and industrial fields where particle size significantly impacts material properties and behavior.

The horizontal axis of the curve typically represents particle size, often on a logarithmic scale, while the vertical axis indicates the cumulative percentage of particles smaller than a given size or the frequency of particles within a specific size range. Different methods are used to determine particle size distribution, including sieving, laser diffraction, and microscopy, each with its own advantages and limitations.

The shape of the hiukkaskokojakaumakäyrä provides valuable information. A narrow distribution indicates that most particles are of similar size, whereas a broad distribution suggests a wide variation in particle sizes. Key parameters derived from the curve include the median particle size (d50), which is the size at which 50% of the particles are smaller, and the uniformity coefficient, which describes the spread of the distribution.

Understanding and controlling particle size distribution is crucial in industries such as pharmaceuticals, ceramics, pigments, and food processing. For instance, in drug manufacturing, particle size affects dissolution rates and bioavailability. In construction, it influences the strength and workability of concrete. Therefore, the hiukkaskokojakaumakäyrä serves as a critical tool for quality control, product development, and process optimization.