Fibers differ from samples of the same substance mainly in terms of particle shape. The different origin plays the essential role, since measuring methods for metal powders are equally relevant for metal fibers, and methods for carbon powders for carbon fibers. If, however, fibers are converted into a filter form, specific measurement methods are relevant for this task, in particular the capillary flow porometry. Therefore, the main purpose of the future application and the material origin decide which measurement methods should be used for the characterization.
| ANALYSIS METHOD | PARAMETER | MEASURING INSTRUMENT |
|---|---|---|
| Laser diffraction (wet or dry) | Particle size of powders | Bettersizer S3 series Bettersizer 2600 Bettersizer ST |
| Image analysis | Particle shape | BeVision D2 Bettersizer S3 Plus |
| Gas adsorption | BET-surface area and pore analysis | 3P micro series 3P meso series 3P sync series 3P surface DX |
| Mercury porosimetry | Pore analysis (pore volume, pore size distribution, raw density) | Contract analysis |
| Dynamic vapor sorption – DVS | Water uptake and -release | 3P graviSorb series |
| Multiple light scattering | Stability of dispersions | Contract analysis |
| Gas pycnometriy | Density | 3P densi series |
| Tapping volumetry | Tap density | BeDensi T series |
| DLS – dynamic light scattering (Photon correlation) | Particle size in nanometer ranges | BeNano series |
| Acoustic spectrometry | Particle size in micrometer and nanometer ranges in concentrated dispersions | DT-1202 DT-100 |
| Electro acoustic | Zeta potential | DT-1202 DT-310 DT-300 |
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