Abstract: The invention relates to a method and device for collecting particles which may be present in an aerosol. The invention consists in electrostatically collecting all the particles in an aerosol, but uncoupling mechanisms of particle charging by unipolar ion diffusion, for charging then collecting the finest particles, from particle charging by a corona effect electrical field, for charging then collecting the biggest particles in a different collection zone from the collection zone for the finest particles. The invention also relates to the use of such a device as ionisation chamber or for evaluating the exposure of workers or consumers to nanoparticles.

Abstract: A device for picking and transporting nano-objects present in an aerosol for analyzing includes a porous sampling filter configured to trap the nano-objects. The device also includes a cassette having means for holding the filter in a cavity within the cassette, an inlet orifice configured to allow aspirated aerosol to pass through, and an outlet orifice configured to pass the filtered aerosol, rid of the nano-objects trapped upstream of the inlet orifice of the cassette. A module of the device is configured to collect, by inertial impaction, the particles of a size above a threshold value and to allow aerosol containing particles of a size smaller than the threshold value to pass. The module is further configured to reduce, during picking, emission noise of the aspiration means of the picking device on which the cassette is fixed.

Abstract: The invention relates to a method and device for collecting particles which may be present in an aerosol. The invention consists in electrostatically collecting all the particles in an aerosol, but uncoupling mechanisms of particle charging by unipolar ion diffusion, for charging then collecting the finest particles, from particle charging by a corona effect electrical field, for charging then collecting the biggest particles in a different collection zone from the collection zone for the finest particles. The invention also relates to the use of such a device as ionisation chamber or for evaluating the exposure of workers or consumers to nanoparticles.

Abstract: A use, as antimicrobial material, of semicrystalline nano- and/or microfibrillated cellulose to which silver nanoparticles are attached, the silver nanoparticles being present in a weight amount strictly greater than 1% and strictly less than 20% relative to the total weight of said cellulose, the material being obtained with a process including at least one step of microwave irradiation of an aqueous dispersion of semicrystalline nano- and/or microfibrillated cellulose supplemented with at least one silver salt, in the presence of a reducing agent. An antimicrobial composition including such an antimicrobial material and to the application thereof for forming an antimicrobial film or coating, in particular for an article for food-processing.

Abstract: A filtration assembly for filtering nanoparticles includes a filter having pores that can retain nanoparticles likely to be found in an air flow passing through the filter and a filter support including two parts. A lower base-forming part of the filter support includes a peripheral bearing surface on which the filter can rest. An upper ring-shaped part of the filter support is designed to be mounted around the bearing surface of the base. By mounting the ring around the bearing surface of the base it is possible to tension the filter radially to the direction of mounting. The mounting clearance between the ring and the bearing surface of the base is dimensioned such as to maintain the filter resting on the bearing surface under mechanical stress by means of pinching, in a direction radial to the mounting direction.

Abstract: A device for picking and transporting nano-objects present in an aerosol for analyzing includes a porous sampling filter configured to trap the nano-objects. The device also includes a cassette having means for holding the filter in a cavity within the cassette, an inlet orifice configured to allow aspirated aerosol to pass through, and an outlet orifice configured to pass the filtered aerosol, rid of the nano-objects trapped upstream of the inlet orifice of the cassette. A module of the device is configured to collect, by inertial impaction, the particles of a size above a threshold value and to allow aerosol containing particles of a size smaller than the threshold value to pass. The module is further configured to reduce, during picking, emission noise of the aspiration means of the picking device on which the cassette is fixed.

Abstract: The invention relates to a filtration assembly for filtering nanoparticles, including: a filter having pores that can retain nanoparticles likely to be found in an air flow passing through the filter; and a filter support including two parts. A lower base-forming part includes a peripheral bearing surface on which the filter can rest. An upper ring-shaped part is designed to be mounted around the bearing surface of the base. By mounting the ring around the bearing surface of the base it is possible to tension the filter radially to the direction of mounting, the mounting clearance between the ring and the bearing surface of the base being dimensioned such as to maintain the filter resting on the bearing surface under mechanical stress by means of pinching, in a direction radial to the mounting direction.