Filtration assembly comprising a filter and a filter support and associated method for the collection and analysis of nanoparticles

A filtration assembly for filtering nanoparticles, comprising:

• a filter having pores that are configured to retain within them nanoparticles that are likely to be present in an air flow intended to pass through the filter,
• a filter support including two parts, the two parts being:
• a lower cylindrical base including an annular bearing surface at a radially inner periphery of the lower cylindrical base on which the filter can rest, thus delimiting a position of a plane of the filter in relation to the filter support, the lower cylindrical base having a planar support radially outward of the annular bearing surface, the annular bearing surface extending from the planar support in an axial direction of the lower cylindrical base;
• and
• an upper ring-shaped part configured to be mounted about an outer periphery of the annular bearing surface of the lower cylindrical base and on the planar support,
• wherein, in a mounted position of the filter, the upper ring-shaped part is mounted about an outer periphery of the annular bearing surface of the lower cylindrical base and on the planar support, and the annular bearing surface of the lower cylindrical base projects beyond the upper ring-shaped part in the axial direction and is configured (i) to mechanically retain the upper ring-shaped part and (ii) to tension the filter in a direction radial to the mounting direction, a mounting clearance between the upper ring-shaped part and the annular bearing surface of the lower cylindrical base being dimensioned such as to maintain the filter resting on the annular bearing surface under mechanical stress by pinching, in a direction radial to the mounting direction.