Droplet migration under temperature gradient is ubiquitous throughout science and engineering. For the molecular type lubricants, the migration performance can be well described by a dynamic model based on Marangoni effects. However, no migration of ionic liquid droplet was observed under temperature gradient. The abnormal behavior may originate from a combination of ordering structure of ions in the interfaces as well as the Coulombic interactions in interior part. The finding reinforces the possibility of ionic liquid as lubricant.

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