Laser diffraction

Dynamic Light Scattering

Microscopy and digital image analysis

Scanning electron microscopy / EDX

Gasadsorption (BET)

Differential Scanning Calorimetry

Air permeability

Helium pycnometry

Mercury porosimetry

Apparent volume

Flowability

Rotary sample divider

 Instrument and measuring principle
The volume of gas adsorbed to the surface of the particles is measured at the boiling point of nitrogen (-196°C). The amount of adsorbed gas is correlated to the total surface area of the particles including pores in the surface. The calculation is based on the BET theory. Traditionally nitrogen is used as adsorbate gas. Using argon as adsorbate gas can theoretically improve the sensitivity by a factor of 4. This is relevant in cases were the specific surface area is low
(<2 m²/g).

Instrument:
  • Micromeritics Gemini 2375.

    Drying:
  • Micromeritics Flowprep 060
       station with nitrogen purging
       or vacuum oven.

    Parameters and applications
    The specific surface area of particulate materials is determined in m²/g or m²/cm³. The specific surface are is related to the total surface area (reactive surface) and is normally larger than the surface area determined by
    air permeability.


    Click here to download a product sheet in PDF (673 KB)

    Click here to download a product sheet in German (703 KB)
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    Micromeritics, Gemini 2375


    Drying station, Flowprep 060

    Prerequisites
    1 – 2 g of dry substance.
    Drying conditions has to be determined.