What is the specific surface area?

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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