M1L8 - Particle size reduction

Milling

This is the operation to break coarse particles into fine particles

Gas adsorption

This measures the amount of gas adsorbed onto a powder sample to determine surface area

BET method

This measures the number of nitrogen gas molecules adsorbed on a single layer of a known weight of powder

Cutting

This uses a blade to reduce particle size

Compression

This uses a cracking machine to reduce particle size

Impact

This uses a hammer or other blunt instrument to reduce particle size

Attrition

This uses an instrument to inflict pressure and friction on an object to reduce particle size

Ball mill

This is a closed system which uses loss free grinding and mixing in dry or wet conditions to produce final products <1um

Jet mill

This is a closed system which uses pressurised air to mill products into sizes 1-20um, can be made sterile and done at low temperature