Chip-Scale Implementation and Cascade Assembly of Particulate Matter Collectors With Embedded Resonant Mass Balances

Maldonado-Garcia, M.; Kumar, Vineet; Wilson, J. C.; Pourkamali, Siavash

doi:10.1109/jsen.2016.2638964

Cited by 20 publications

(23 citation statements)

References 21 publications

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“…As expected for microresonator mass sensors (Maldonado-Garcia et al 2016;Paprotny et al 2013;Lee et al 2007), the response is linear with time for constant mass addition (based on a constant upstream particle concentration). For comparison purposes, the difference in upstream and downstream CPC particle concentrations was integrated over the collection time to produce the equivalent, cumulative mass assuming a particle diameter of 300 nm and a density of 1.2 g/cm 3 .…”

Section: Online Mass Sensingsupporting

confidence: 58%

“…The method can be further exploited by arranging microresonators in a small-scale, portable cascade impactor arrangement (Maldonado-Garcia et al 2016) to provide size-segregated online mass and integrated bulk compositional information of the collected sample. Future microresonator surface compositional analysis with mass spectrometry could be extended to smaller resonators in one of two ways.…”

Section: Discussionmentioning

confidence: 99%

“…Their development as particulate mass sensors is principally due to their high sensitivity, direct mass measurements (Wasisto et al 2016;Maldonado-Garcia et al 2016;Paprotny et al 2013;Zielinski et al 2016). They offer an alternative to optical particle counting methods that only infer mass and fail to measure ultrafine (< 100 nm diameter) particles (Heim et al 2008;Wang et al 2015), potentially the most influential for human health (Harrison and Yin 2000).…”

Section: Introductionmentioning

confidence: 99%

“…A separate method of particle collection and sizing is required, however, since microresonators lack any inherent sizing abilities. Implemented methods include inertial impaction (Maldonado-Garcia et al 2016;Zielinski et al 2016), thermophoresis (Paprotny et al 2013), and electrophoresis (Wasisto et al 2016). The requirement of particle deposition limits the lifetime of the device (Mehdizadeh et al 2017), but in turn enables the potential for additional analysis on the collected aerosol similar to filter or conventional impactor samples.…”

Section: Introductionmentioning

confidence: 99%

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Compositional Analysis of Adsorbed Organic Aerosol on a Microresonator Mass Sensor

et al. 2018

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Aerosol mass measurements are a key air pollution parameter that is regulated in most countries. Beyond mass measurements, the precise composition of the aerosol is essential in identifying sources and impacts on health and climate. The conventional method for simultaneously quantifying mass and composition is to collect aerosol onto filter or impactor samples followed by laboratory analysis. This approach requires long collection times-providing poor time resolution for mass measurementsand long sample preparation prior to analysis. The first limitation can be circumvented with microresonators, which are novel particulate mass sensors with high mass sensitivities and time resolutions. In addition, direct surface analysis techniques, like liquid extraction surface analysis mass spectrometry (LESA-MS), shorten sample preparation times. This work combines, for the first time, the high time resolution mass measurements of a microresonator with the integrated compositional analysis of LESA-MS. Laboratory-produced secondary organic aerosol were collected onto a microresonator via impaction with LESA-MS being used to analyze the chemical composition afterwards. The results were compared with classic filter extraction methods and literature with the final spectra matching the expected reaction products. The combined technique demonstrates an extension to current microresonator applications and illustrates their potential for ambient aerosol studies.

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Section: Online Mass Sensingsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Compositional Analysis of Adsorbed Organic Aerosol on a Microresonator Mass Sensor

et al. 2018

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“…A growing field also exists for measuring particulate matter with MEMS microresonators. [32][33][34][35] Their small size and weight, and ability to monitor submicron particle mass make microresonators attractive for ambient monitoring. Here we demonstrate that water uptake by hygroscopic inorganic and organic aerosols can be quantified.…”

mentioning

confidence: 99%

Measuring Aerosol Phase Changes and Hygroscopicity with a Microresonator Mass Sensor

et al. 2018

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The interaction between atmospheric aerosol particles and water vapor influences aerosol size, phase, and composition, parameters which critically influence their impacts in the atmosphere. Methods to accurately measure aerosol water uptake for a wide range of particle types are therefore merited. We present here a new method for characterizing aerosol hygroscopicity, an impaction stage containing a microelectromechanical systems (MEMS) microresonator. We find that deliquescence and efflorescence relative humidities (RHs) of sodium chloride and ammonium sulfate are easily diagnosed via changes in resonant frequency and peak sharpness. These agree well with literature values and thermodynamic models. Furthermore, we demonstrate that, unlike other resonator-based techniques, full hygroscopic growth curves can be derived, including for an inorganic-organic mixture (sodium chloride and malonic acid) which remains liquid at all RHs. The response of the microresonator frequency to temperature and particle mechanical properties and the resulting limitations when measuring hygroscopicity are discussed. MEMS resonators show great potential as miniaturized ambient aerosol mass monitors, and future work will consider the applicability of our approach to complex ambient samples. The technique also offers an alternative to established methods for accurate thermodynamic measurements in the laboratory.

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Resonant Silicon Microcantilevers for Particle and Gas Sensing

Xu,

Peiner

2023

Springer Series on Chemical Sensors and Biosensors

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Chip-Scale Implementation and Cascade Assembly of Particulate Matter Collectors With Embedded Resonant Mass Balances

Cited by 20 publications

References 21 publications

Compositional Analysis of Adsorbed Organic Aerosol on a Microresonator Mass Sensor

Compositional Analysis of Adsorbed Organic Aerosol on a Microresonator Mass Sensor

Measuring Aerosol Phase Changes and Hygroscopicity with a Microresonator Mass Sensor

Resonant Silicon Microcantilevers for Particle and Gas Sensing

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