Drying of a 75μL droplet of 40% poly(ethylene oxide) solution in water. The duration of the experiment was approximately 2 hours, the distance...
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Drying of a 75μL droplet of 40% poly(ethylene oxide) solution in water. The duration of the experiment was approximately 2 hours, the distance across the image approximately 10mm. Timings given below are given relative to the video, to aid identification of the various stages and processes.
The droplet shows a very short stage 1, around 1 second. The contact angle increases until 3 seconds and bootstrap deposition (stage 3) continues until 4 seconds. However, there is still liquid inside the structure at this point, which is ejected as stage 4 begins. The base radius of the final cone is around three quarters that of the initial droplet.
