Ferrofluid is a unique material that has both magnetic and liquid properties. It is a colloidal solution of nano-sized particle of magnetite suspended in a liquid. (Purchased). This activity will review what students know about magnetism and compares that knowledge to how ferrofluid behaves.
Many natural materials have nanostructures that affect their properties. Experiment with milk and gelatin to study properties that are a result of their nanostructures.