Sensing of Airborne Nanoparticles Using Miniaturized Whipple Double Condenser

Terence Barrett, Beelee Chua, Britt A. Holmen

Research output: Contribution to journalArticle

Abstract

We have demonstrated the sensing of airborne nanoparticles using a miniaturized Whipple double condenser (MWDC). Each condenser (17 mm long, 2.2 mm wide, and 1 mm tall) was fabricated using photolithography and copper electroplating. The MWDC was theoretically shown to function within the laminar flow regime and capable of detecting 10-and 20-nm particles at a flow rate of 0.3 LPM. Monodispersed isopropyl alcohol and oleic acid airborne nanoparticles (10 and 20 nm) were generated using a TSI Model 9302 Single Jet Atomizer and TSI 3080 Electrostatic Classifier, and were electrically charged with 85Kr isotope. The calculated and experimental particle pass through ratio (PPR) agreed reasonably well. Using a Keithley 616 electrometer, similar threshold condenser voltage (maximum second condenser current) was observed in both experimental PPR as well as the second condenser current versus condenser voltage plot. The MWDC also displayed characteristic Whipple curves in its experimental I/V versus kc plots. These data demonstrate the feasibility of the microfabricated double condenser design as the basis of a miniaturized nanoparticle sizing and counting device.

Original languageEnglish
Article number7498623
Pages (from-to)6990-6996
Number of pages7
JournalIEEE Sensors Journal
Volume16
Issue number18
DOIs
Publication statusPublished - 2016 Sep 15

Fingerprint

condensers
Nanoparticles
nanoparticles
Electrometers
Atomizers
Oleic acid
Electric potential
Electroplating
Photolithography
Laminar flow
Isotopes
Electrostatics
Alcohols
Classifiers
Flow rate
Copper
plots
atomizers
isopropyl alcohol
electrometers

Keywords

  • airborne nanoparticles
  • miniaturized
  • Particle pass through ratio
  • Whipple double condenser

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering

Cite this

Sensing of Airborne Nanoparticles Using Miniaturized Whipple Double Condenser. / Barrett, Terence; Chua, Beelee; Holmen, Britt A.

In: IEEE Sensors Journal, Vol. 16, No. 18, 7498623, 15.09.2016, p. 6990-6996.

Research output: Contribution to journalArticle

Barrett, Terence ; Chua, Beelee ; Holmen, Britt A. / Sensing of Airborne Nanoparticles Using Miniaturized Whipple Double Condenser. In: IEEE Sensors Journal. 2016 ; Vol. 16, No. 18. pp. 6990-6996.
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