Port-Saint-Louis-du-Rhône, France
Port-Saint-Louis-du-Rhône, France
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Patent
Seb S.A. and Ethera Inc. | Date: 2017-08-02

The invention relates to a filtration device (110) for an air purification appliance, comprising a first filtering cartridge structure (104) containing a classic absorbent or adsorbent material selected from activated carbon or zeolite, characterised in that the device comprises a second, different filtering cartridge structure (106) holding a filtering medium consisting of a specific adsorbent material which is porous and functionalised with at least one probe molecule in such a way as to trap aldehyde-type chemical contaminants.


Plaisance H.,Ecole des Mines d'Ales | Vignau-Laulhere J.,Ecole des Mines d'Ales | Vignau-Laulhere J.,Ethera Inc. | Mocho P.,University of Pau and Pays de l'Adour | And 3 more authors.
Environmental Science: Processes and Impacts | Year: 2017

Building and furniture materials are known to be major sources of volatile organic compounds (VOCs) indoors. During the construction process, an introduced material can have a more or less long-term impact on the indoor air quality according to the building characteristics. In this study, field measurements were carried out at six construction stages in three energy-efficient timber-frame houses. Data analysis focused on the ten most abundant compounds found among an initial list of fifteen target VOCs, namely formaldehyde, acetaldehyde, hexanal, toluene, m/p-xylenes, ethylbenzene, styrene, α-pinene, 3-carene and d-limonene. The chemical compositions and concentration variation patterns were recorded. The results showed a high pollution count, with m/p-xylenes and ethylbenzene concentrations ranging from 1900 to 5100 μg m-3 occurring at the time of the structural work (representing more than 88% of the sum of the target VOCs). Emission tests done on a large number of materials used in the construction revealed that this pollution is due to the emissions from the polyurethane adhesive mastic used as a sealing material. The emission kinetics of polyurethane adhesive mastic was assessed alone and also within a material assembly reconstituting a room wall. The results showed that the superposition of materials led to a slowing down of the VOC emission process from polyurethane adhesive mastic, which explains the concentration decays recorded in houses during the construction process. At the final construction stage, the concentration levels were low for all compounds (the sums of the target VOCs were between 18 and 32 μg m-3), with the aldehydes (formaldehyde, acetaldehyde and hexanal) now becoming the major fraction in the chemical composition in the last stages of construction (representing 50-70% of the sum of the target VOCs). This is in agreement with the fact that the sources of aldehydes are the most numerous among the materials and have rather slow emission kinetics. © The Royal Society of Chemistry 2017.


Vignau-Laulhere J.,Ethera Inc. | Vignau-Laulhere J.,Ecole des Mines d'Ales | Mocho P.,University of Pau and Pays de l'Adour | Plaisance H.,Ecole des Mines d'Ales | And 2 more authors.
Analytical and Bioanalytical Chemistry | Year: 2016

New passive samplers using a sensor consisting of a sol-gel matrix entrapping Fluoral-P as sampling media were developed for the determination of formaldehyde in indoor air. The reaction between Fluoral-P and formaldehyde produces a colored compound which is quantified on-site by means of a simple optical reading module. The advantages of this sensor are selectivity, low cost, ppb level limit of detection, and on-site direct measurement. In the development process, it is necessary to determine the sampling rate, a key parameter that cannot be directly assessed in the case of diffusive samplers using optical chemical sensor. In this study, a methodology combining experimental tests and numerical modeling is proposed and applied at five different radial diffusive samplers equipped with the same optical chemical sensor to assess the sampled material flows and sampling rates. These radial diffusive samplers differ in the internal volume of the sampler (18.97 and 6.14 cm3), the position of sensor inside the sampler (in front and offset of 1.2 cm above the membrane) and the width of the diffusion slot (1.4 and 5.9 mm). The influences of these three parameters (internal volume, position of sensor inside the sampler, and width of the diffusion slot) were assessed and discussed with regard to the formaldehyde sampling rate and water uptake by sensor (potential interference of measure). Numerical simulations based on Fick's laws are in agreement with the experimental results and provide to estimate the effective diffusion coefficient of formaldehyde through the membrane (3.50 × 10-6 m2 s-1). Conversion factors between the sensor response, sampled formaldehyde mass and sampling rate were also assessed. © 2016 Springer-Verlag Berlin Heidelberg.


Vignau-Laulhere J.,Ethera Inc. | Vignau-Laulhere J.,Ecole des Mines d'Ales | Plaisance H.,Ecole des Mines d'Ales | Mocho P.,University of Pau and Pays de l'Adour | And 3 more authors.
Analytical Methods | Year: 2015

The radial diffusive standard sampler Radiello® filled with Florisil impregnated with 2,4-dinitrophenylhydrazine (DNPH) was evaluated with the goal of survey monitoring the formaldehyde concentration in indoor air for a 4.5 day sampling time. A Radiello® sampler provides measurements with a relative standard deviation of repeatability comprised between 1.5 and 4.0%, a high sampling rate assessed to 98.7 ± 2.8 mL min-1 under standard conditions (temperature: 19.9 ± 0.5 °C and relative humidity: 52.9 ± 3.2%) and a detection limit of 0.5 μg m-3 for a 4.5 day sampling time. The influence of three environmental factors (temperature (T°), relative humidity (RH) and ozone concentration (O3)) on the sampling rate was also evaluated in an exposure chamber following a fractional design of the experiment at two factor levels (low and high). Temperature is found to be the factor leading to the most significant variation of the sampling rate with an effect of +1.8% per °C. From the fractional design of the experiment, a model was set up for expressing the sample rate of Radiello® as a function of significant factors and the uncertainty on the sampling rate was assessed to 11.9% under the domain of tested conditions. This journal is © The Royal Society of Chemistry.


PubMed | Ecole des Mines d'Ales, Ethera Inc. and University of Pau and Pays de l'Adour
Type: Journal Article | Journal: Analytical and bioanalytical chemistry | Year: 2016

New passive samplers using a sensor consisting of a sol-gel matrix entrapping Fluoral-P as sampling media were developed for the determination of formaldehyde in indoor air. The reaction between Fluoral-P and formaldehyde produces a colored compound which is quantified on-site by means of a simple optical reading module. The advantages of this sensor are selectivity, low cost, ppb level limit of detection, and on-site direct measurement. In the development process, it is necessary to determine the sampling rate, a key parameter that cannot be directly assessed in the case of diffusive samplers using optical chemical sensor. In this study, a methodology combining experimental tests and numerical modeling is proposed and applied at five different radial diffusive samplers equipped with the same optical chemical sensor to assess the sampled material flows and sampling rates. These radial diffusive samplers differ in the internal volume of the sampler (18.97 and 6.14 cm(3)), the position of sensor inside the sampler (in front and offset of 1.2 cm above the membrane) and the width of the diffusion slot (1.4 and 5.9 mm). The influences of these three parameters (internal volume, position of sensor inside the sampler, and width of the diffusion slot) were assessed and discussed with regard to the formaldehyde sampling rate and water uptake by sensor (potential interference of measure). Numerical simulations based on Ficks laws are in agreement with the experimental results and provide to estimate the effective diffusion coefficient of formaldehyde through the membrane (3.5010(-6) m(2) s(-1)). Conversion factors between the sensor response, sampled formaldehyde mass and sampling rate were also assessed.


Patent
Seb S.A. and Ethera Inc. | Date: 2014-06-27

Provided is a filter cartridge for an air purifier, comprising a structure ensuring the retention of a filter medium, the filter medium comprising a standard absorbent material chosen from the group consisting of activated charcoal or zeolites, and the filter medium further comprises a nanoporous specific absorbent material functionalized with probe molecules in such a way that chemical pollutants of the aldehyde type can be trapped.


Trademark
Ethera Inc. | Date: 2011-09-21

Chemicals, namely, polymer and porous polymer compositions used in the manufacture of commercial and industrial goods; sol-gel process materials, namely, metal oxides, metal alkoxides and metal chlorides; mineral substances in the nature of filtering materials used in air and water filtration; collector chemicals used in industry. Apparatus and instruments enabling the capture and measurement of pollutants, namely, pollutant sensors; electronic gas sensors; computer software for database management in the fields of pollution, detection, metrology and capturing pollutants.


Trademark
Ethera Inc. | Date: 2014-09-09

Chemical products, namely, polymers and porous polymers for use in the manufacture of industrial products, consumer and household products, sealants, and automotive fluids; sol-gel materials, namely, metal oxides, metal alkoxides and metal chlorides; mineral substances, namely, in the nature of filtering materials used in air and water filtration; chemical sensors, namely, polymer and porous polymer compositions used to detect gases. Products for purifying air, namely, air disinfectants for sanitary purposes, air purifying preparations; chemical sensors for sanitary and hygienic use, namely, chemical preparations for sanitary and hygienic use. Scientific instruments, namely, electronic analyzers for measuring contaminants and environmental pollutants; apparatus for the collection of pollutants, namely, pollutant sensors; electronic sensors, namely, electronic gas sensors; electric sensors; computer software for database management in the fields of pollution, detection, metrology and capturing pollutants for use in the fields of pollution detection, metrology and pollutant capture. Apparatus and machines for purifying and cleaning air and water, namely, air purification units, water purification units; filters (parts of household or industrial installations), namely, air filtering installations for industrial use; Filters for drinking water.


Trademark
Ethera Inc. | Date: 2011-11-08

Chemicals, namely, polymer and porous polymer compositions used in the manufacture of commercial and industrial goods; sol-gel process materials, namely, metal oxides, metal alkoxides and metal chlorides; mineral substances in the nature of filtering materials used in air and water filtration; collector chemicals used in industry. Products for purifying air and water, namely, disinfectants for sanitary purposes; collector chemical preparations for sanitary and hygienic purposes. Apparatus and instruments enabling the capture and measurement of pollutants, namely, pollutant sensors; electronic gas sensors; computer software for database management in the fields of pollution, detection, metrology and capturing pollutants. Apparatus and machines for purifying air and water; water filters; air filters for industrial installations and private housing; apparatus for purifying compressed and industrial gases. Treatment of air, water and waste in the fields of pollution, detection, metrology and capturing pollutants; purification of air and water. Scientific research; engineering and chemical analyses provided by engineers in the fields of pollution, detection, metrology and capturing pollutants.


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