On the Inherent Variability of Particulate Matter Concentrations on Small Scales and the Consequences for Miniaturized Particle Sensors

Paul, Manabi; Röhrer, Georg; Bainschab, Markus; Bergmann, Alexander

doi:10.4209/aaqr.2019.01.0048

Cited by 8 publications

(7 citation statements)

References 12 publications

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“…At our sampling time of t s = 9.5 min and an air flow rate of Q = 0.3 mL/min, we have a sample volume of vs. ~3 mL, which at the measured concentration of 10 µg/m 3 corresponds to a total particle mass in the sample of ~30 pg. In agreement with our finding, a 10% uncertainty can be expected at a total sample mass of 30 pg according to model calculations for PM 1 [ 30 ].…”

Section: Microfluidic Channel-based Mobility-selective Particle Sizersupporting

confidence: 91%

Ultrafine Aerosol Particle Sizer Based on Piezoresistive Microcantilever Resonators with Integrated Air-Flow Channel

Bertke

Kirsch

Uhde

et al. 2021

Sensors

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To monitor airborne nano-sized particles (NPs), a single-chip differential mobility particle sizer (DMPS) based on resonant micro cantilevers in defined micro-fluidic channels (µFCs) is introduced. A size bin of the positive-charged fraction of particles herein is separated from the air stream by aligning their trajectories onto the cantilever under the action of a perpendicular electrostatic field of variable strength. We use previously described µFCs and piezoresistive micro cantilevers (PMCs) of 16 ng mass fabricated using micro electro mechanical system (MEMS) technology, which offer a limit of detection of captured particle mass of 0.26 pg and a minimum detectable particulate mass concentration in air of 0.75 µg/m3. Mobility sizing in 4 bins of a nebulized carbon aerosol NPs is demonstrated based on finite element modelling (FEM) combined with a-priori knowledge of particle charge state. Good agreement of better than 14% of mass concentration is observed in a chamber test for the novel MEMS-DMPS vs. a simultaneously operated standard fast mobility particle sizer (FMPS) as reference instrument. Refreshing of polluted cantilevers is feasible without de-mounting the sensor chip from its package by multiply purging them alternately in acetone steam and clean air.

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Section: Microfluidic Channel-based Mobility-selective Particle Sizersupporting

confidence: 91%

Ultrafine Aerosol Particle Sizer Based on Piezoresistive Microcantilever Resonators with Integrated Air-Flow Channel

Bertke

Kirsch

Uhde

et al. 2021

Sensors

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“…Within the sampling time of 10 min, an average deviation of 24.9 ± 5.3% relative to the 'true values' measured by FMPS was observed at an average uncertainty of 2.3 ± 0.1 µg/m 3 . A much smaller deviation (7.2 ± 1.9%) was achieved in a period of 1 h-3.3 h. Large error contributions were found for the measured values within the first 40 min and at the last 2.7 h. This may have been caused by fluctuations of ambient conditions (T, rH, particle size distribution) around the cantilever [37,38]. In the previous work [24], we found a resonance frequency decrease of a bare EtPCS of up to~11 Hz upon an increase of both temperature (~2 K) and rH (~14%).…”

Section: Etpcs Cantilever Performancementioning

confidence: 83%

In-Plane and Out-of-Plane MEMS Piezoresistive Cantilever Sensors for Nanoparticle Mass Detection

Setiono

Bertke

Nyang’au

et al. 2020

Sensors

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In this study, we investigate the performance of two piezoresistive micro-electro-mechanical system (MEMS)-based silicon cantilever sensors for measuring target analytes (i.e., ultrafine particulate matters). We use two different types of cantilevers with geometric dimensions of 1000 × 170 × 19.5 µm3 and 300 × 100 × 4 µm3, which refer to the 1st and 2nd types of cantilevers, respectively. For the first case, the cantilever is configured to detect the fundamental in-plane bending mode and is actuated using a resistive heater. Similarly, the second type of cantilever sensor is actuated using a meandering resistive heater (bimorph) and is designed for out-of-plane operation. We have successfully employed these two cantilevers to measure and monitor the changes of mass concentration of carbon nanoparticles in air, provided by atomizing suspensions of these nanoparticles into a sealed chamber, ranging from 0 to several tens of µg/m3 and oversize distributions from ~10 nm to ~350 nm. Here, we deploy both types of cantilever sensors and operate them simultaneously with a standard laboratory system (Fast Mobility Particle Sizer, FMPS, TSI 3091) as a reference.

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“… The study is equally applicable and quite of highly enhancing also for the study like [40] and scale-based barriers must be always in great concern like [41].  The study could vary or modify available practices of greenery in and along road-side pollution concern as studied for [42] and [43].…”

Section: Discussionmentioning

confidence: 99%

Airborne Particulate Distribution and Removal (Settling) by Statistics Interest and Physicalness

Biswas

2023

Optimization and Computational Case Studies in Civil Engineering

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Although it’s not new to describe airborne particulate settling by nature of statistics or probability frequency distribution (PFD), but this present study would enrich the subject of aerosol science and its behavioural analysis. This study has explored several insights on settling phenomenon of particulate matter in ambient air. These insights are completely new or newly explained to the study. However, to narrate such several insights, the study has applied the subjective interpretation, combined with logical motions and innovation. Three-dimensional visions on particulate settling and its behavioural characters has been applied and PM10 is kept at point of limelight in the study. Totally, this paper is going to be highly interesting alongwith various research scopes. Specifically, built-up environment and its concern to climate-change abatement would get new-age cutting-edges by innovation and creative designs, by the study. Readers would find this study useful with theirs’ own enrichment of subjective knowledge-depths surely and out-the-most a satisfaction to become a seer to the new theory of various dimensions evolve.

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On the Inherent Variability of Particulate Matter Concentrations on Small Scales and the Consequences for Miniaturized Particle Sensors

Cited by 8 publications

References 12 publications

Ultrafine Aerosol Particle Sizer Based on Piezoresistive Microcantilever Resonators with Integrated Air-Flow Channel

Ultrafine Aerosol Particle Sizer Based on Piezoresistive Microcantilever Resonators with Integrated Air-Flow Channel

In-Plane and Out-of-Plane MEMS Piezoresistive Cantilever Sensors for Nanoparticle Mass Detection

Airborne Particulate Distribution and Removal (Settling) by Statistics Interest and Physicalness

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