Michel Attoui

Michel Attoui
Université Paris-Est Créteil Val de Marne - Université Paris 12 | UPEC · Physique

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108
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Publications

Publications (108)
Article
Brilke et al. (2020) have recently characterized several commercial condensation particle counters (CPCs) based on clusters of tetraheptylammonium bromide and tetrabutylammonium iodide. These seed particles were generated by a bipolar electrospray source (BES) and purified by high resolution mobility separation. Paradoxically, their results suggest...
Article
Brilke et al. (2020) have recently characterized several commercial condensation particle counters (CPCs) based on clusters of tetraheptylammonium bromide and tetrabutylammonium iodide. These seed particles were generated by a bipolar electrospray source (BES) and purified by high resolution mobility separation. Paradoxically, their results suggest...
Article
The measurement of airborne particles with sizes below 3 nm is critical, as it helps the understanding of atmospheric nucleation and elucidates important particle synthesis mechanisms in the gas phase. Condensation particle counters (CPCs) have been widely used to measure the concentration of aerosols. However, it is challenging for the CPCs to mea...
Article
While condensation particle counters (CPCs) are routinely used to measure particle number concentrations in the size range from 3 to 1000 nm, the detection efficiency for sub-3 nm particles remains relatively poor. In this study, the performance of an ultrafine butanol based CPC for the measurement of alkyl ammonium halide ions, flame-generated par...
Article
The potential of using atmospheric-pressure spark ablation for production of atomic clusters has been shown in the recent past. In this study we used this method to produce atomic clusters in Argon and investigated their chemical composition with an atmospheric pressure inlet time-of-flight mass spectrometer (APi-TOF-MS). Both anionic and cationic...
Article
A butanol-based fast condensation particle counter (Fast CPC, Model 3650, Kanomax Inc., Japan) was characterized in this study with three different types of monodisperse particles, including positively and negatively charged nickel-chromium (Ni/Cr) particles, positively charged tetraheptyl ammonium bromide (THABr) and tetrabutyl ammonium bromide (T...
Article
Scanning mobility particle sizer (SMPS) is widely used for particle number size distribution measurements of submicron particles. In this work, two TSI® SMPSs equipped with a soft X-ray neutralizer and a Kr-85 neutralizer, respectively, were operated in parallel to measure particle number size distributions of ambient air. An independent TSI® ultra...
Article
Calibration of optical counters, condensation particle counters, electrical impactors, filtration efficiency measurement, heterogeneous condensation (and many other laboratory applications in aerosol science and technology) are widely used with singly charged particles classified by a differential mobility analyzer with particles smaller than 1 μm....
Article
Electrical mobility and mass of atmospheric ions are of great importance, since both properties jointly determine their charging states. In this work, different carrier gases of bottle N2, bottle air, and particle-free lab air were passed through a TSI® soft X-ray aerosol neutralizer to produce both positive and negative ions. The electrical mobili...
Article
Full-text available
Tetraheptylammonium bromide (THABr), tetrabutylammonium bromide (TBABr) and tetraethylammonium bromide (TEABr) dissolved in methanol or water methanol mixtures (~ 1mM) produce via positive electrospray atomization and high resolution classification electrical classification standard clean ions (monomer and dimer) which are singly charged. THABr is...
Article
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This review discusses the developments in aerosol instrumentation that have led to the current vapor condensation based instruments capable of detecting sub-3 nm particles. We begin from selected reports prior to the year 1991, which have advanced the technology or understanding in condensation particle counting toward sub-3 nm sizes, and continue...
Article
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In the present paper, we expose how we boosted the performance of a commercial condensation particle counter (CPC) model TSI 3010 to detect particles as small as 1.5 nm while preserving the robustness and reliability of the original instrument. The TSI 3010 was selected because of our deep knowledge of its internal workings and its large incorporat...
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Fragmentation of molecular clusters inside mass spectrometers is a significant source of uncertainty in a wide range of chemical applications. We have measured the fragmentation of sulfuric acid clusters driving...
Article
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In the present paper, we expose how we boosted the performances of a commercial CPCmodel TSI 3010 to detect particles as small as 1.5nm, while preserving the robustness and reliability of the original instrument. The TSI 3010 was selected for its wide availability on the second-hand market, our deep knowledge of its internals, and its large interna...
Article
Full-text available
Classifying sub-3 nm particles effectively with relatively high penetration efficiencies and sizing resolutions is important for atmospheric new particle formation studies. A high-resolution supercritical differential mobility analyzer (half-mini DMA) was recently improved to classify aerosols at a sheath flow rate less than 100 L/min. In this stud...
Article
The removal characteristics of sub-25 nm ultrafine particles (UFPs) by different porous nanomaterials with different morphologies were studied based on efficiency curves obtained with specially designed filtration system. The material morphological effects on UFPs collection were investigated. The results demonstrate a complex and synergic mechanis...
Article
Ultrafine laminar TSI CPC based on the work of Stolzenburg and Mc Murry (1991) is widely used in aerosol science for the detection of particles down to 3 nm (D50 ~ 2.7 nm). This instrument uses butanol as working fluid. Di ethylene glycol (DEG) as working fluid has been introduced by Iida et al. 2011 for the activation and the growth of sub 3 nm pa...
Article
Measurement of atmospheric sub-10 nm nanoparticle number concentrations has been of substantial interest recently, which, however, is subject to considerable uncertainty. We report a laboratory characterization of a high flow differential mobility particle sizer (HFDMPS), which is based on the Half-mini type differential mobility analyzer (DMA) and...
Article
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Condensation particle counter (CPC) technology has continued to evolve, with the introduction of several new instruments over the last several years. An important aspect in the characterization of these instruments is the measurement of their time response. Yet there is no standardly accepted approach for this measurement. Here we evaluate differen...
Article
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Measurement systems for particle sizing starting at 1 nm are used to bridge the gap between mass spectrometer measurements and traditional aerosol sizing methods, and thus to enable measurement of the complete size distribution from molecules and clusters to large particles. Such a measurement can be made using a scanning mobility particle sizer eq...
Article
The ability to properly scale the synthesis of advanced materials through combustion synthesis routes is limited by our lack of knowledge regarding the initial stages of particle formation. In flame aerosol reactors, the high temperatures, fast reaction rates, and flame chemistry can all play a critical role in determining the properties of the res...
Article
Full-text available
In this study we characterized the performance of three new particle counters able to detect particles smaller than 3 nm during the Helsinki condensation particle counter (CPC) workshop in summer 2016: the Aerosol Dynamics Inc. (ADI; Berkeley, USA) versatile water condensation particle counter (vWCPC), TSI 3777 nano enhancer (TSI Inc., Shoreview, U...
Article
Few studies reported the formation of Ti-containing clusters in the initial stages of TiO2 flame synthesis. The conversion from synthesis precursor to TiO2 monomers was commonly assumed to take place through global reaction such as thermal decomposition and/or hydrolysis at high temperatures. More recent studies have been able to identify stable in...
Article
Charging in flames significantly affects the properties of the resultant particles produced because of its influence in almost all stages of particle formation. The charging characteristics of flame-generated sub-3 nm particles were investigated with three enhanced particle detectors including a high resolution differential mobility analyzer (DMA)...
Article
Full-text available
The scientific need to understand nanoparticle dynamics at sizes below 3 nm has pushed companies to develop commercial solutions to measure particles down to 1 nm. In this study we characterize the performance of three new particle counters able to detect particles smaller than 3 nm: Aerosol Dynamics Inc versatile water condensation particle counte...
Article
Full-text available
Presented is a laminar-flow, water-based condensation particle counter capable of particle detection near 1 nm. This instrument employs a three-stage, laminar-flow growth tube with a “moderator” stage that reduces the temperature and water content of the output flow without reducing the peak supersaturation, and makes feasible operation at the larg...
Article
Dielectric barrier discharge (DBD) and spark discharge, two versatile atmospheric pressure plasma-based techniques, have been employed to generate nanoparticles. This study compares the characteristics of metal nanoparticles generated by a DBD reactor and a spark discharge generator with argon as the working gas. The gas temperature in the discharg...
Article
This study aimed to measure in French children personal exposure concentrations of black carbon (BC) and ultrafine particles (UFP), and to quantify the contribution of different microenvironments (home, school, places of extra-curricular activities, transport) to their total exposure. It was conducted on 96 9-year-old children from the PARIS birth...
Poster
Full-text available
Modelling tools have shown that new particle formation (NPF) by nucleation and growth can significantly contribute to the total number concentrations of aerosol particles and consequently to the number of cloud condensation nuclei. In particular, nucleation is expected to be a major contributor to the total particle number concentration at higher a...
Article
Full-text available
Measuring sub-3 nm particles outside of controlled laboratory conditions is a challenging task, as many of the instruments are operated at their limits and are subject to changing ambient conditions. In this study, we advance the current understanding of the operation of the Airmodus A11 nano Condensation Nucleus Counter (nCNC), which consists of a...
Article
While flame aerosol reactor (FLAR) synthesis of nanoparticles is widely used to produce a range of nano-materials, incipient particle formation by nucleation and vapor condensation is not well understood. This gap in our knowledge of incipient particle formation is caused by limitations in instruments, where, during measurements , the high diffusiv...
Article
Electrophoretic losses at the outlet of Differential Mobility Analyzers result from the need to transport the aerosol from the high voltage _V__Bias_ typically applied to the inner electrode, to the ground potential at which a particle detector is usually connected. Here we examine the sample transmission efficiency η for mobility-selected ions bro...
Article
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Nascent soot particles with mobility diameters ≤10nm were measured in an ethylene/air premixed flame to shed light on the challenges and potential artifacts affecting studies on soot inception by Differential Mobility Analysis (DMA) techniques. The Size Distribution Functions (SDFs) of particles with charge acquired either naturally or diffusively...
Article
Heterogeneous nucleation of vapor on a seed particle surface is dependent on the seed properties such as size, chemical composition and electric charging state, of which the significance of the charging state has not been uncovered unambiguously. The underlying problem is that on the molecular level, the charging state and the chemical composition...
Article
Aerosol instrument characterization and verification for nanometer-sized particles requires well-established generation and classification instruments. A precise size selection of sub-3-nm charged aerosol particles requires a differential mobility analyzer (DMA), specially designed for the sub-3-nm size range. In this study, a Herrmann-type high-re...
Article
Full-text available
Measuring sub-3 nm particles outside of controlled laboratory conditions is a challenging task, as many of the instruments are operated at their limits and are subjected to changing ambient conditions. In this study, we advance the current understanding on the operation of Airmodus A11 nano Condensation Nucleus Counter (nCNC), which 5 consists of a...
Article
Full-text available
An approach consisting in combining in situ and laboratory experiments is often favoured for investigating the mechanisms involved in the weathering of the materials of the cultural heritage. However, the realistic simulation in the laboratory of the environmental conditions ruling the interactions of atmospheric compounds with materials is a very...
Article
Full-text available
A new method for generating metal clusters in the gas phase is described and characterized in this work. The method is based on material evaporation by spark ablation at atmospheric pressure. The characterization of atomic clusters was done by measuring their electrical mobility. The measured mobilities were compared with values found in literature...
Article
Full-text available
In this work we explored the possibility to detect sub-3 nm particles with commercially available TSI 3772 and Airmodus A20 Condensation Particle Counters (CPCs), when operated under modified temperature and inlet flow settings. We generated highly monodisperse sub-3 nm nanoparticles and characterized the CPCs with temperature differences between t...
Article
Full-text available
Because of the rise of anthropogenic sources of NP human exposure to NP has dramatically increased in the recent years, in the general population as well as in workers (e.g. welders). This raises the question of the potential adverse effects of NP on human health particularly at the respiratory level since it represents the main route of exposure f...
Article
Measurement of the size distributions of neutral sub 3 nm aerosol particles is technically a challenging task. Here we present laboratory experiments on sizing of neutral tungsten oxide clusters with two independent methods: Airmodus A11 Particle Size Magnifier (PSM) and a combination of a high resolution differential mobility analyzer (DMA) and an...
Article
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Copyright 2015 American Association for Aerosol Research
Article
Measuring stable clusters to understand particle inception will aid the synthesis of well-controlled nanoparticles via gas-phase aerosol routes. Using a Half Mini differential mobility analyzer (DMA), the presence of monomers, dimers, trimers and tetramers were detected for the first time in a flame aerosol reactor during the synthesis of pristine...
Article
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A charge reduced electro-hydrodynamic atomization (EHDA) device has been used to generate airborne salt clusters in the sub 10 nm size range. The focus of this study on that specific sub-micron range of electrospray droplets with relatively high electrical conductivities and permittivities aims to address the still existing controversy on the scali...
Article
We studied the chemical composition of commonly used condensation particle counter calibration ions with a mass spectrometer and found that in our calibration setup the negatively charged ammonium sulphate, sodium chloride and tungsten oxide are the least contaminated whereas silver on both positive and negative and the three mentioned earlier in p...
Article
Full-text available
Generation of monomobile molecular standards by electrospray (ES) followed by classification in a differential mobility analyzer (DMA) fails at diameters above ∼2 nm because many clusters in different charge states z crowd in a narrow mobility range. Use of a second DMA (DMA2) in series (tandem) with DMA1 is very helpful because, unexpectedly, many...
Article
Full-text available
To calibrate a newly developed condensation particle counter, samples of known chemical composition are needed as the chemistry plays a role in the activation process. For that, we have built a calibration setup and produced ammonium sulfate, sodium chloride, tungsten oxide, silver, alkyl halide, and ionic liquid clusters down to 1 nm in mobility d...
Article
The charge distribution of polystyrene nanoparticles electrosprayed from l-methyl-2-pyrrolidone (NMP) dimethylammonium formate (10/1 vol.) is studied by a continuous tandem differential mobility analyzer (TDMA) technique. Two DMAs operated in series as narrow band mobility filters are scanned in a quasi-continuous fashion providing highly informati...
Article
The chargedistributionofpolystyrenenanoparticleselectrosprayedfroml-methyl-2- pyrrolidone(NMP)dimethylammoniumformate(10/1vol)isstudiedbya continuous tandem differentialmobilityanalyzer(CTDMA)technique.TwoDMAsoperatedinseries as narrowbandmobilityfiltersarescannedinaquasi-continuousfashionproviding highlyinformativetwo-dimensional(2D)spectra.Thefir...
Article
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We use a charge reduction electrospray (ESI) source and subsequent ion mobility analysis with a differential mobility analyzer (DMA, with detection via both a Faraday cage electrometer and a condensation particle counter) to infer the densities of single and multiprotein ions of cytochrome C, lysozyme, myoglobin, ovalbumin, and bovine serum albumin...
Article
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We report a new scanning mobility particle spectrometer (SMPS) for measuring number size distributions of particles down to 1 nm mobility diameter. This SMPS includes an aerosol charger, a TSI 3085 nano differential mobility analyzer (nanoDMA), an ultrafine condensation particle counter (UCPC) using diethylene glycol (DEG) as the working fluid, and...
Article
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The transfer functions and penetrations of five differential mobility analyzers (DMAs) for sub-2 nm particle classification were evaluated in this study. These DMAs include the TSI nanoDMA, the Caltech radial DMA (RDMA) and nanoRDMA, the Grimm nanoDMA, and the Karlsruhe-Vienna DMA. Measurements were done using tetra-alkyl ammonium ion standards wit...
Article
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The validity of the Stokes-Millikan equation is examined in light of mass and mobility measurements of clusters of the ionic liquid 1-ethyl-3-methyl-imidazolium tetrafluoroborate (EMI-BF4) in ambient air. The mobility diameter dZ based on the measured mobility and the Stokes-Millikan law is compared with the volume diameter dv, which generalizes th...
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In this work we present the latest design of the Vienna type Dif-ferential Mobility Analyzer (DMA). The so-called UDMA is spe-cially designed for high-resolution mobility measurements for the particle size range between 1 and 5 nm and has been optimized to be combined with a mass spectrometer to provide a well-defined mo-bility fraction of molecula...
Article
Introduction Second hand cigarette smoke consists predominantly of nanoparticles (with two dimensions less than 100 nanometres). The aim of this study was to examine the aerosol of cigarette smoke suspended in the air of a smoking room, its disappearance over the course of time, and its retention in the airways of passive smokers, as these processe...
Article
Second hand cigarette smoke consists predominantly of nanoparticles (with two dimensions less than 100 nanometres). The aim of this study was to examine the aerosol of cigarette smoke suspended in the air of a smoking room, its disappearance over the course of time, and its retention in the airways of passive smokers, as these processes remain poor...
Article
Laser-Induced Breakdown Spectroscopy has been employed to detect sodium chloride and metallic particles with sizes ranging from 40 nm up to 1 µm produced by two different particle generators. The Laser-Induced Breakdown Spectroscopy technique combined with a Scanning Mobility Particle Sizer was evaluated as a potential candidate for workplace surve...
Article
A resistively heated metal wire is shown to be a source of charged atomic clusters consisting of only a few atoms. They are size classified with a differential mobility analyzer, and their relative abundance is determined as a function of size. AgnK+ clusters are obtained from wires containing silver with traces of potassium to provide the electric...