A calorimeter to detect freezing in supercooled water droplets

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Abstract

This apparatus suspends a 1 μ1 water droplet on an ultraminiature thermistor and uses a Peltier cooling device to supercool the droplet. Electrical connections to the thermistor allow the temperature of the droplet to be constantly monitored, and they also permit direct electrical heating of the droplet after freezing has occurred. Deionized water droplets can be readily supercooled to temperatures of -20°C before freezing, and repeated determinations of the freezing temperature for the same droplet are straightforward. The temperature characteristics of the phase change are very well defined, and the apparatus therefore permits many other investigations on the provocation of freezing in a supercooled droplet.

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Harrison, R. G., & Lodge, B. N. (1998). A calorimeter to detect freezing in supercooled water droplets. Review of Scientific Instruments, 69(11), 4004–4005. https://doi.org/10.1063/1.1149212

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