In the case of powdery carbon materials, of course, the particle size distribution plays a crucial role for the characterization, while for granulated samples, the meso- and macropores are often the focus of attention. Investigation of micropores are relevant for both powdery and granulated samples, since the micropores usually exhibit a major part of the specific surface area, and most of the exchange and sorption processes take place there. Activated carbons belong to special carbons and adsorbents. Wood, coal, graphite and carbon blacks mostly possess moderate specific surfaces, which are used for other applications. Specifically carbon blacks used as fillers for car tires have led to a special parameter, the so-called STSA surface area, which is measured by gas adsorption and requires a BET analyzer.
| ANALYSIS METHOD | PARAMETER | MEASURING INSTRUMENT |
|---|---|---|
| Laser diffraction (wet or dry) | Particle size of powder | 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 |
| DLS – dynamic light scattering (Photon correlation) | Particle size in nanometer ranges | BeNano series |
| Gas pycnometry | Density | 3P densi 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 |
| Multiple light scattering | Stability of dispersions | Contract analysis |
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