Identification of nanomaterials Sample Clauses

Identification of nanomaterials. If the VSSA calculated by using the BET surface area is lower than the threshold, then the sample should be considered as non-nanomaterial, while the BET surface area is higher than the threshold then the t-plot should be used to detect the presence of an internal porosity or the presence of a coating and to estimate the external surface of the particles. This external surface is then used to calculate the VSSA. It seems that all nanomaterials were identified by VSSA approach and the results obtained are quite comparable to the information obtained by electron microscopy, even if, in some cases the VSSA approach is overprotective, leading to identify false positive nano- materials. As VSSA approach is overprotective, the three following cases are considered:  If the VSSA corresponding to the external surface area of the particles is lower than the threshold, then the material should be considered as non-nano.  If the VSSA appears to be slightly higher (about 20%) than the threshold, it is necessary to determine the particle size distribution by TEM image analysis to decide the nano character of the material.  If the VSSA is much higher than the threshold, the material should be considered as nano. The relative good agreement between these experimental VSSA values and the calculated VSSA values on the basis of the particle size distributions obtained by TEM image analysis provides confidence in both approaches. This confirms that the VSSA criterion is a simple practical way to assess the “non-nano” character of a powder without using expensive sophisticated methods based on number particle size distribution
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