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Miniaturized Dehumidifier Integrated with Acetone Breathalyzer

CHEN, HOU-YU (2019) Miniaturized Dehumidifier Integrated with Acetone Breathalyzer. Master's Thesis, University of Pittsburgh. (Unpublished)

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In this article, we are targeting on simulating human breath test on acetone breathalyzer.
As increasing amount of literature shows that breath acetone has strong links with human
metabolism, health and diets such as nutrition related ketogenic diet. Normal individuals has breath
level ranging from 0.5 ppm to 2 ppm. People doing ketogenic diet would increase up to 40 ppm.
However, multiple studies point out the acetone sensor response diminished while testing under
high humidity level conditions. Therefore, the designed thermoelectric dehumidifier is applied on
acetone sensor to remove moisture. The results compared with and without input dehumidified
system on acetone concentration tests show that dehumidified process can precise the
concentration to 1ppm level at 90 % relative humidity.
For miniaturized dehumidifier to portable size, we introduced SU-8 negative photoresist to
create microchannel. Polydimethylsiloxane (PDMS) material contains inert, non-toxic and optical
clear properties which dominates the material choices on microfluidic devices. The PDMS
microchannel dehumidifier not only reduced humidity levels but minimized dehumidified devices


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
CHEN, HOU-YUhoc37@pitt.eduhoc370000-0003-3359-0492
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Thesis AdvisorCho, Sung Kwonskcho@pitt.eduskcho
Committee MemberLee, Sang Yeopsylee@pitt.edusylee
Committee MemberChun, Young Jaeyjchun@pitt.eduyjchun
Date: 16 September 2019
Date Type: Publication
Defense Date: 16 July 2019
Approval Date: 16 September 2019
Submission Date: 16 July 2019
Access Restriction: 2 year -- Restrict access to University of Pittsburgh for a period of 2 years.
Number of Pages: 34
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Mechanical Engineering
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: Dehumidifier, thermoelectric cooler, Peltier devices, acetone
Date Deposited: 16 Sep 2019 20:28
Last Modified: 16 Sep 2021 05:15


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