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Keywords:

  • Chinese brush;
  • dynamic wetting;
  • liquid transfer;
  • anisotropic multi-scale structures
Thumbnail image of graphical abstract

The controllable liquid transfer of a Chinese brush is attributable to the unique anisotropic multi-scale structures of the freshly emergent hairs. A large mass of liquid an be dynamically balanced within the brush as a cooperative effect of the Laplace pressure difference, the asymmetrical retention force, and gravity. Inspired by this, a device is developed with parallel hairs that allows for direct writing of micro-lines.