A pyroelectric thermal sensor for automated ice nucleation detection

Frederick Cook, Rachel Lord, Gary Sitbon, Adam Stephens, Alison C Rust, Walther Schwarzacher*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

Abstract

A new approach to automating droplet freezing assays is demonstrated by comparing the ice nucleating efficiency of a Kfeldspar glass and a crystal with the same bulk composition. The method uses a pyroelectric polymer PVDF (polyvinylidene fluoride) as a thermal sensor. PVDF is highly sensitive, cheap and readily available in a variety of sizes. As a droplet freezes latent heat is released, 5 which is detected by the sensor. Each event is correlated with the temperature at which it occurred. The sensor has been used to detect microlitre volume droplets of water freezing, from which frozen proportion curves and nucleation rates can be quickly and automatically calculated. Our method shows glassy K-feldspar to be a poor nucleator compared to the crystalline form.
Original languageEnglish
JournalAtmospheric Measurement Techniques
DOIs
Publication statusAccepted/In press - 3 May 2020

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