How can the surface area of powders (organic and inorganic) be determined? What should be the concerns and requirements: I mean the information do determine the surface area of these materials? Can the surface area of materials change?
The Brunauer–Emmett–Teller (BET) (*) gas-adsorption technique is widely used to measure the specific surface area of powders or porous materials.
(*) http://pubs.acs.org/doi/abs/10.1021/ja01269a023
Dear Sir,
Are there some requirements for determination of surface area of materials using the technique?
Hello sir,
Analysis of powder or porous material can be done by using Surface area analyzer machine.
Yes the material surface area do change that depends how you prepare the material.
In case of requirements, the first one is that the material should be properly evacuated or degassed then only it can be connected to Surface Area analyzer.
Before starting the measurement you should take TGA of that compound to know about the thermal stability of that material.
Also you can follow this paper to know more
http://pubs.acs.org/doi/pdf/10.1021/ja071174k
I fully agree with answer by Queiroz that gas adsorption methods is one of the most popular method of determine the surface areas of powder of porous materials. Meaning that some inorganic solid materials are capable of adsorbing gases. This property is exploited to determine the surface areas of such materials in such a way that specific gases will be subjected to be adsorbed by specific inorganic materials and then from amount and volume of gases adsorbed by inorganic material per unit mass data, the surface area of inorganic material can be calculated. There are a number of sorption/adsorption models that can describe the gas adsorption phenomena by inorganic solids which you can refer to.
OK, but you need to 'degas' the materials at ~300-400 C. If the materials for which you are determining the surface area gets decomposed: for example saw dusts, the method as mentioned in the response above cannot be used. Then what can be done in these cases!
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Materials
- Composites
- Nanocomposites