Articles | Volume 11, issue 10
https://doi.org/10.5194/amt-11-5629-2018
https://doi.org/10.5194/amt-11-5629-2018
Research article
 | 
15 Oct 2018
Research article |  | 15 Oct 2018

An instrument for quantifying heterogeneous ice nucleation in multiwell plates using infrared emissions to detect freezing

Alexander D. Harrison, Thomas F. Whale, Rupert Rutledge, Stephen Lamb, Mark D. Tarn, Grace C. E. Porter, Michael P. Adams, James B. McQuaid, George J. Morris, and Benjamin J. Murray

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Cited articles

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Beall, C. M., Stokes, M. D., Hill, T. C., DeMott, P. J., DeWald, J. T., and Prather, K. A.: Automation and heat transfer characterization of immersion mode spectroscopy for analysis of ice nucleating particles, Atmos. Meas. Tech., 10, 2613–2626, https://doi.org/10.5194/amt-10-2613-2017, 2017. 
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Broadley, S. L., Murray, B. J., Herbert, R. J., Atkinson, J. D., Dobbie, S., Malkin, T. L., Condliffe, E., and Neve, L.: Immersion mode heterogeneous ice nucleation by an illite rich powder representative of atmospheric mineral dust, Atmos. Chem. Phys., 12, 287–307, https://doi.org/10.5194/acp-12-287-2012, 2012. 
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Short summary
The detection of low concentrations of ice-nucleating particles (INPs) is challenging. Here we present a new technique (IR-NIPI) that is sensitive to low concentrations of INPs (> 0.01 L−1) and uses an infrared camera with a novel calibration to detect the freezing of experimental suspensions. IR-NIPI temperature measurements prove to be robust with a series of comparisons to thermocouple measurements. Experimental comparisons to other freezing assay instruments are also in agreement.