Hydrophobic Water Droplet Leaf Roller Lab

20 mins Ages 4-6 Outdoor

A playful, screen-free adventure designed to spark curiosity, sensory exploration, and fine motor skills for kids aged 4 to 6.

Materials Needed

  • • Superhydrophobic garden leaf (nasturtium, kale, or cabbage) (1 leaf)
  • • Eye dropper or medicine pipette (1 unit)
  • • Cup of water (1 unit)

Pro Tips

  • → Leaves like nasturtium, cabbage, and kale are superhydrophobic, covered with microscopic wax bumps that repel water.
  • → Drip water onto a flat nasturtium leaf: the drops form spheres that roll like liquid ball bearings.
  • → Tilt the leaf: the rolling water drops collect dust and dirt as they slide off, showing how leaves clean themselves.

Safety First

Handle garden leaves gently so they stay attached to living plants.

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Step-by-Step Instructions

1

Step 1

Find a garden plant with waxy leaves like nasturtium, kale, or hosta.

2

Step 2

Fill an eye dropper with tap water and hold it 2 cm above a flat leaf.

3

Step 3

Squeeze out single drops, watching the water form round beads instead of soaking into the leaf.

4

Step 4

Gently tilt the leaf to roll the water beads around the surface like liquid marbles.

What they are learning

The Lotus Effect (superhydrophobicity) Contact angle surface tension Microscopic wax cuticle architecture