🪷 The lotus effect and self-cleaning surfaces

Unit 3 · Nanomaterials in use · 8 min

A lotus leaf is covered with micro- and nano-scale bumps topped with wax, so water beads into near-spheres and rolls off carrying dirt. This is the "lotus effect" (superhydrophobicity). Scientists copy it for water-repellent fabric, self-cleaning glass and anti-stain coatings.

Words in this lesson

• 荷叶 (hé yè) — lotus leaf
• 表面 (biǎo miàn) — surface

Project: Drop water on paper, plastic, wax paper and a leaf; photograph and compare the drops.