Open-hardware design and characterization of an electrostatic aerosol precipitator

Kasparoǧlu, Sabin; Wright, Timothy P.; Petters, M. D.

doi:10.1016/j.ohx.2022.e00266

Cited by 3 publications

(3 citation statements)

References 49 publications

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“…Initially these dimer particles consist of touching spheres, and we also refer to those as bispheres. Particles exiting the coagulation chamber are passed through an electrostatic precipitator (Kasparoglu et al, 2022b) to remove all charged particles. Next, particles are passed through a coalescence chamber, which exposes the particles for a fixed time to elevated temperature conditions; this is measured at the outside of the metal chamber.…”

Section: Phase State Responsementioning

confidence: 99%

Characterization of a modified printed optical particle spectrometer for high-frequency and high-precision laboratory and field measurements

et al. 2022

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Abstract. The printed optical particle spectrometer (POPS) is a lightweight, low-cost instrument for measurements of aerosol number concentrations and size distributions. This work reports on modifications of the Handix Scientific commercial version of the POPS to facilitate its use in multi-instrument aerosol sampling systems. The flow system is modified by replacing the internal pump with a needle valve and a vacuum pump. The instrument is integrated into closed-flow systems by routing the sheath flow from filtered inlet air. A high-precision multichannel analyzer (MCA) card is added to sample the analog pulse signal. The MCA card is polled at 10 Hz frequency using an external data acquisition system and improves upon the count-rate limitation associated with the POPS internal data acquisition system. The times required to change the concentration between 90 % and 10 % and vice versa for a step change in concentration were measured to be 0.17 and 0.41 s at a flow rate of 5 cm3 s−1. This yields a sampling frequency of ∼ 1–2 Hz, below which the amplitude of measured fluctuations is captured with > 70 % efficiency. The modified POPS was integrated into the dual tandem differential mobility analyzer system to explore the coalescence of dimer particles. Results show that the pulse-height response increases upon dimer coalescence. The magnitude of the increase is broadly consistent with the change in light-scattering amplitude predicted by the T-matrix method. It is anticipated that this modified version of the POPS will extend the utilization of the technique for a range of field and laboratory applications.

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Section: Phase State Responsementioning

confidence: 99%

Characterization of a modified printed optical particle spectrometer for high-frequency and high-precision laboratory and field measurements

et al. 2022

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“…This simplies the setup and is cheaper compared to the dual tandem DMA method, which requires three DMAs and at least two condensation particle counters, a coagulation chamber, multiple neutralizers, lead shielding to prevent spontaneous particle decharging, and an electrostatic precipitator. 15,57 Furthermore, the dual tandem DMA setup requires very high number concentration of particles, 21,22 necessitating working with broad DMA size cuts, multiple atomizers to generate particles, need to dry high sample ows, and frequent cleaning of the DMAs due to plugging. In contrast, the DMA-POPS method works with much lower particle concentrations e.g., 600 cm −3 that is used in this study.…”

Section: Discussionmentioning

confidence: 99%

Direct measurement of the viscosity of ternary aerosol mixtures

Mahant

Iversen

Kasparoǧlu

et al. 2023

Environ. Sci.: Atmos.

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“…Coagulation events with +1/−1 and +2/−2 particles produce neutral particles. The flow exiting the coagulation chamber was routed through an electrostatic precipitator (Kasparoglu et al., 2021, 2022) operated at 1.5 kV potential to remove all charged particles from the flow. Charge neutral particles transmitted through the electrostatic precipitator were passed through a temperature controlled volume which served as the coalescence chamber.…”

Section: Methodsmentioning

confidence: 99%

Experimental Determination of the Relationship Between Organic Aerosol Viscosity and Ice Nucleation at Upper Free Tropospheric Conditions

et al. 2022

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Cirrus clouds play an important role in Earth's energy budget by reflecting the incoming solar radiation into space which leads to cooling, and by reducing the infrared longwave coming from the Earth surface which leads to warming (Chen et al., 2000;Heymsfield et al., 2017;Storelvmo & Herger, 2014). The radiative properties of cirrus clouds depend on the ice crystal number concentration, which in turn depends on the aerosol that nucleate ice at these conditions. Cirrus cloud ice crystals form either through homogeneous processes, requiring no ice nucleating particle (INP) or active site, or heterogeneously where an INP is involved (Hoose & Möhler, 2012;Kanji et al., 2017;Vali et al., 2015). Heterogeneous ice nucleation (IN) can occur via deposition of ice on particle surfaces, condensation in pores and subsequent freezing (Campbell et al., 2017;David et al., 2019;Marcolli, 2014), through immersion freezing of droplets as they cool, or condensation freezing as particles simultaneously uptake water and cool. Another freezing path is contact freezing where a particle approaches the air-water interface from either the outside of the droplet or from inside of the droplet (Durant & Shaw, 2005;Kanji et al., 2017). Homogeneous freezing of liquid aerosol is predominantly controlled by water activity (or ambient relative humidity (RH)), temperature, particle size, and hygroscopicity (Baumgartner et al., 2022;Koop et al., 2000;Schneider et al., 2021). Among these, temperature and RH dominate. Chemical composition influences homogeneous IN by modulating hygroscopicity (Junge, 1953;M. D. Petters & Kreidenweis, 2007). However, the overall influence of chemical composition on homogeneous freezing nucleation is small (Kreidenweis et al., 2009). In contrast, heterogeneous IN strongly depends on the chemical composition and morphology (Hiranuma et al., 2014). Ambient measurements of cirrus ice crystal residuals show a wide range of chemical composition, including organic particles, black carbon, mineral dust, lead and other metal bearing particles, sulfate particles, and salt particles

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Open-hardware design and characterization of an electrostatic aerosol precipitator

Cited by 3 publications

References 49 publications

Characterization of a modified printed optical particle spectrometer for high-frequency and high-precision laboratory and field measurements

Characterization of a modified printed optical particle spectrometer for high-frequency and high-precision laboratory and field measurements

Direct measurement of the viscosity of ternary aerosol mixtures

Experimental Determination of the Relationship Between Organic Aerosol Viscosity and Ice Nucleation at Upper Free Tropospheric Conditions

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