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What is the specific surface area?

Source:nclirik Posted:2021-11-15

What is the specific surface area?

The specific surface area refers to the total area of a unit mass material. The unit is m2/g. Usually refers to the specific surface area of solid materials, such as powders, fibers, particles, flakes, blocks and other materials.

The relationship between specific surface area and particle size

Generally speaking, the smaller the particle size, the larger the specific surface area.
The smaller the particle diameter, the more the number of particles per unit volume, the greater the total surface area, and the greater the specific surface area ratio.

Comparison table of particle size and specific surface

Particle size/m Specific surface/m²lg
The diameter of the spherical model The diagonal length of the cube model The length of a cylindrical needle model with a length to diameter ratio of 10:1 The diagonal of a thin sheet model with an aspect ratio of 1:1:0.1
1mm 1.00E-03 0.006 0.010 0.048 0.034
0.5mm 5.00E-04 0.012 0.021 0.096 0.068
0.1mm 1.00E-04 0.06 0.10 0.48 0.34
50um 5.00E-05 0.12 0.21 0.96 0.68
10um 1.00E-05 0.6 1.0 4.8 3.4
5um 5.00E-06 1.2 2.1 9.6 6.8
1um 1.00E-06 6 10 48 34
0.5um 5.00E-07 12 21 96 68
100nm 1.00E-07 60 104 480 339
50nm 5.00E-08 120 208 960 679
10nm 1.00E-08 600 1040 4800 3394
5nm 5.00E-09 1200 2080 9600 6787
2nm 2.00E-09 3000 5200 24000 16968
1nm 1.00E-09 6000 10400 48000 33936

Remarks: The above results assume that the true density of the material is 1g/ml3, the general organic material is mostly about 0.5g/mI3-1g/mI3, the inorganic material is mostly about 1g/ml3-3g/ml3, and the metal material is 3g/ml3-8g. /mlI is mostly. The corresponding specific surface is the corresponding value in the table divided by the multiple of its density relative to 1.


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Which models can be selected for processing ultra-fine powder?

HGM Ultrafine Grinding Mill: 74-5 micron(200-2500 mesh); D97=5 micron
YGM Raymond mill: 613-33 micron(30-325 mesh); D90=30 micron
CLUM vertical roller mill: 20-5 micron(600-3000 mesh); D50=2 micron D97=4 micron
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