Click on a link to retrieve supplementary data submitted for this article:

• i) Tabulated data on the designs of microfluidic channels used for ice nucleation experiments, ii) drawings of the PRTD sensor arrays used for this project, iii) a description of the process of fabricating the PRTD sensor arrays, iv) the calibration procedure for the PRTD sensors, v) derivation of the equations used for the calculation of ice nucleation rates, vi) the generalization of these equations for the case in which the temperature of the channel fluctuates, and vii) a description of the other electronic files included in the ESI
• (PDF format, KB)

• The freezing temperature and cooling rate data for ice nucleation experiments on pure water
• (RTF format, KB)

• The freezing temperature and cooling rate data for ice nucleation experiments seeded with silver iodide
• (RTF format, KB)

• This movie shows the full sequence of drop handling: generation, cooling, and freezing. A full frame from this movie is shown in Fig. 6a
• (AVI format, KB)

• This movie shows with high temporal and spatial resolution the two-step process of freezing in supercooled water: first the rapid formation of ice dendrites, and then the more gradual freezing of the rest of the water inside the drop. The sequence of images in Fig. 6b was extracted from this movie
• (AVI format, KB)

• This movie is part of the actual movie recorded for the measurement of homogenous nucleation rates; the image in this movie was not cropped
• (AVI format, KB)

• This movie is part of the actual movie recorded for the measurement of heterogeneous nucleation rates; the image in this movie was not cropped
• (AVI format, KB)

• Drops of water freezing while flowing in a microfluidic channel. Part 1: Generation, cooling and freezing
• (MOV format, KB)

• Drops of water freezing while flowing in a microfluidic channel. Part 2: High resolution imaging of freezing
• (MOV format, KB)

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