# Difference between revisions of "Colloidal self-assembly at an interface"

Edited by Qichao Hu

September 19th, 2010

reference: [1]

It has been well known that colloidal particles can form at the interfaces between liquids. This phenomenon can be used to self-assemble colloidal particles and ultimately to synthesize new materials.

The colloidal particles' ability to bind to liquid and stabilize emulsion is guided by the need to minimize interfacial energy. When a particle moves from a liquid to a liquid-liquid interface, the change in free energy is

$\Delta G=-\pi R^2\gamma_{OW} (1-\cos\theta_C)^2$

where $R$ is the particle radius, $\gamma_{OW}$ is the energy per unit area of the liquid-liquid interface, and $\theta_C$ is the contact angle.