How do you calculate specific surface area?

How do you calculate specific surface area?

The specific surface area of a powder is determined by physical adsorption of a gas on the surface of the solid and by calculating the amount of adsorbate gas corresponding to a monomolecular layer on the surface.

How do you find the specific surface area of an aggregate?

Here, the specific surface area of the aggregates are calculated using the Branauer, Emmett, and Teller (BET) equation as shown below(1) A = n m N 0 M α where A is the specific surface area of aggregate, N0 is the avogadro’s number, nm is the monolayer capacity of the aggregate surface, M is the molecular weight of …

How do you calculate specific surface area from a BET analysis?

Measuring method By means of the BET equation the amount of adsorbed gas, which build up one monolayer on the surface, can be calculated from the measured isotherm. The amount of molecules in this monolayer multiplied by the required space of one molecule gives the BET surface area.

What is specific area of adsorbent?

Values obtained for specific surface area depend on the method of measurement. In adsorption based methods, the size of the adsorbate molecule (the probe molecule), the exposed crystallographic planes at the surface and measurement temperature all affect the obtained specific surface area.

What is the difference between specific surface area and surface area?

The total surface area is specific for the external surface, while the BET surface area is calculated with whole the surface such as surface of pores, external surface of material and calculated by the adsorption of nitrogen gas on the surface of materials.

What is the formula of TSA of sphere?

Therefore, the Surface Area of a Sphere with radius r equals 4πr2 .

What is specific surface area of nanoparticles?

Depending on the particle shape, the European Commission has communicated nanomaterial identification guidelines that a material potentially composed of nanoparticles and with a volume specific surface area in the range of VSSA > 20 m2/m3 up to VSSA > 60 m2/m3 is entitled as a nanomaterial.

What is the formula of surface area and volume?

What is the formula of surface area and volume?

Shape	Total Surface Area	Volume formula
Cuboid	2(lb+bh+hl) Where, l = length, b = breadth and h = height	Length x Width x Height
Prism	ph+2B Where p= perimeter of the base, h = height and B =area of the base	Area of base x Height

What is the relationship between particle size and surface area?

Specific Surface Area and Particle Size The relationship between the particle size and surface area. The specific surface area increases with decreasing particle size. The specific surface area is also increased if the particle has pores.

What is the formula for calculating mode?

L = Lower limit Mode of modal class. fm = Frequency of modal class. f1 = Frequency of class preceding the modal class. f2= Frequency of class succeeding the modal class….Mode Formula Calculator.

Mode Formula =	L + (fm – f1) x h / (fm – f1) + (fm – f2)
=	0 + (0 – 0) x 0 / (0 – 0) + (0 – 0)= 0