Identification of properties of powder materials-BET
BET
Principle:
Using the isothermal adsorption characteristic curve of nitrogen: at the liquid nitrogen temperature, the adsorption amount of nitrogen on the solid surface depends on the relative pressure of nitrogen (P/P0), P is the partial pressure of nitrogen, and P0 is the saturated vapor pressure of nitrogen at the liquid nitrogen temperature.
When P/P0 is in the range of 0.05~0.35, the adsorption capacity and (P/P0) conform to BET equation, which is the basis for determining specific surface area of powder materials by nitrogen adsorption method.
When P/P0³ is 0.4, capillary condensation occurs, that is, nitrogen begins to condense in the micropores.
Measurement results:
The obtained data, through experimental and theoretical analysis, can be measured pore volume, pore size distribution (the so-called pore volume, pore size distribution refers to the change rate of the volume of holes with different pore size).
Application areas:
Battery industry: energy storage batteries, lithium batteries, fuel cells, battery materials (cobalt acid lithium, three elements, polymer, quartz, alkaline manganese, lithium ion, acetylene black, cobalt oxide, lithium iron phosphate, additives, conductive agent, corrosion inhibitor, manganese powder, electrolytic manganese dioxide, graphite powder, the positive active material, negative active material, zinc powder, graphite, manganese acid lithium), etc.
Chemical industry: catalyst, activated carbon, adsorbent, powder metallurgy, etc.
Rubber industry: carbon black, ultrafine fiber, porous fabric, sediment, etc.
New materials: electromagnetic materials, fluorescent materials, luminescent rare earth powder materials, powder materials, powder materials, magnetic powder materials, nano powder materials, ceramic materials, nano ceramic materials, nano metal materials, composite materials, etc.
Others: medicine, ceramics, cosmetics, pigment fillers, inorganic pigments, etc.
