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Drop freezing: fine detection of contaminants by measuring the tip angle

Abstract : In this Letter, we show that the shape of a freezing drop of water can be sensitive to the presence of impurities. We measure the tip angle of water drops frozen on a cold plate. The fine changes in tip angle are robustly captured by our image analysis method, which shows a deviation from that of pure water in solutions with salt (NaCl), polymer (PEG) and surfactant (TTAB) starting at concentrations of $10^{-6}$, $10^{-4}$ and $10^{-6}$ M respectively. The method could be adapted into a portable water purity tester, but the work also highlights the complexity of water freezing as it is influenced by trace concentrations of impurities.
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https://hal.archives-ouvertes.fr/hal-02489383
Contributor : François Boulogne <>
Submitted on : Monday, February 24, 2020 - 2:17:01 PM
Last modification on : Friday, February 28, 2020 - 1:31:25 AM
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  • HAL Id : hal-02489383, version 1

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François Boulogne, Anniina Salonen. Drop freezing: fine detection of contaminants by measuring the tip angle. Applied Physics Letters, American Institute of Physics, In press. ⟨hal-02489383⟩

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