Emulsion Formation

This video demonstrates a concept in Biological Physics by Philip Nelson.  He explains how certain substances can act as surfactants, and create emulsion to stabilize oil in water.  A surfactant belongs to the class of materials called amphiphiles which have a hydrophobic and a hydrophilic part.  The hydrophobic parts are attracted to the oil and the hydrophilic part is attracted to the water.  An oil droplet can be surrounded by these hydrophobic parts which creates a sphere showing only hydrophilic heads on the outside while the hydrophobic tails hide the oil on the inside.  This video shows the formation of the sphere on a nanoscale.  You can see in the end that all the heads are the only thing you can see on the outside as the tails are hidden.

 

http://www.youtube.com/watch?v=6vabRDBMPRE&NR=1

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