Effect of particle shape Sample Clauses

Effect of particle shape. The proposed VSSA threshold 60m²/cm³ is calculated for a monodispersed distribution of spherical particles with a 100 nm diameter. A generalization of the use of VSSA to another non-spherical particle can be considered by defining a characteristic, representative dimension corresponding to the smallest size of the particles. The concept of an “equivalent sphere diameter” is typically dependent on the measurement technique and may not apply to decide if a material is a nanomaterial or not. It is better to define a characteristic size for each particle shape. Such an approach was made for various particle shapes considering for particles of unit density; the VSSA is simply the ratio between the external surface area of the particle and its volume. As a result of this study, it appears that the VSSA threshold value varies from 60m²/cm³ for spherical or cubic particles to 40 m²/cm³ for fibers and rods; to 20m²/cm³ for sheet-like or platelets objects. Intermediate values can be considered if the aspect ratios for rods or platelets is known. Depending on the particle shape and characteristic size, the VSSA threshold value for monodispersed particle size distribution, can be expressed by: VSSA = a/D, where D represents the characteristic size of the particle and “a” is a positive numerical constant depending on the shape and on the density of the particles.
Sample 1
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