Emulsions

John Coupland

Penn State

• “Everything is made from atoms. That is the key hypothesis. The most important hypothesis in all of biology, for example, is that everything that animals do, atoms do. In other words, there is nothing that living things do that cannot be understood from the point of view that they are made of atoms acting according to the laws of physics”– The Feynman lectures in physics, vol 1, 1963 (pp

1-8).

Getting There

• Molecules

• Solutions

– Water activity

• Solubility

• Phases

Structure

• Phases

• Volume fraction

• Sizes

• Surfaces

Inner cylinder

Outer cylinder

Dis

tance

/ m

Function

Stability

v

d

Viscosity, h

Density, r

Structure-Function

Thin liquid Viscous liquid Gelled solid