How much will be the density of ZnO nanoparticles usually (particle size less than 50 nm)? I need this value to carry out BET analysis to measure the surface area of my samples.
Prashanth,
You might consider a value of 5.606 g/cm3. But the right to find and confirm this value so is to use a pycnometer to calculate the true density of your material.
Thank you sir... but few say that we should consider the bulk density value of ZnO nanopowder value while carrying out BET analysis.. and Bulk density of ZnO nanoparticles is usually around 0.25 g/cm3..Please clarify
To do BET analysis you must use the "true density", calculated by helium pycnometer and not the bulk density, which depends on the process conditions and may differ by the conditions that were used along processing.
Thank you very much sir sir... While carrying out BET analysis, the instrument asks for the density...We should enter true density only there...?
and sir, could you kindly clarify whether that entered density value affects the final result which we get from the instrument?
Prashanth,
When the instrument ask about the density, you must provide the true density. As all the BET analysis is based on the density of the material (g/cm3), an incorrect value of this property has a direct influence for example on the specific surface area (m2/g). Anyway, I'm not a expert on this kind of measure but I hope I have said something clear about this.
Unless you have a reason to think your ZnO particles are not fully dense, you can, as suggested. use the theoretical density (5.606 g/cm). If you want to verify the density, do as suggested and use helium pycnometry. If you don't have access to a pycnometer, the main manufacturer of such instruments will determine the density of your sample for a fee. See: http://www.labqmc.quantachrome.com/
Dear Marcelo your suggestions are really of a great help... Thank you very much...
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