An integrated electrical condensation particle counter for compact and low-cost ultrafine particle measurement system

Jae Wan Jeon, Seong Jae Yoo, Yong Jun Kim

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, we developed a compact and low-cost measurement system that can measure the real-time number concentration of airborne ultrafine particles (UFPs, particles smaller than 100 nm). Our system is based on the condensation nucleation method; however, it counts particles based on their electrostatic properties (i.e., dielectric constant) to overcome the limitations of complex optical systems that have traditionally been employed. The new system consists of two components: a microfluidic particle growth channel to grow UFPs into micron-sized water droplets and a capacitive particle counter to count the grown droplets. To effectively reduce the size and cost of the system, each system was fabricated into a single module using a semiconductor manufacturing process prior to integration. Super-hydrophilic micropillar wicks were monolithically integrated with Printed Circuit Board substrate channels to use water as the condensing working fluid. A glass substrate interdigitated electrode chip with a 3 μm gap was fabricated and placed on the impaction plate of an inertial impactor to be used as a sensor. Numerical calculations were performed to verify the dimensions of the channel required for efficient supersaturated vapor generation. Quantitative experiments using NaCl, (NH4)2SO4, and Ag2O UFPs showed that our system could grow particles larger than 50 nm into micron-sized droplets and count up to 10,300 N cm−3 particles with linear electrostatic properties.

Original languageEnglish
Article number105996
JournalJournal of Aerosol Science
Volume163
DOIs
Publication statusPublished - 2022 Jun

Bibliographical note

Funding Information:
This work was supported by Korea Environment Industry & Technology Institute (KEITI) through Technology Development Project for Biological Hazards Management in Indoor Air Project, funded by Korea Ministry of Environment (MOE) ( 2021003370005 ).

Publisher Copyright:
© 2022 Elsevier Ltd

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Pollution
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Atmospheric Science

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