So what this essentially does, the reason this takes place spontaneously is because it creates a more stable lower and energy system in which we now have the interactions between these water molecules and these polar heads. Those are the hydrogen bonds. We also have electric interaction between these adjacent polar heads. These are shown in purple and we also have these green interactions and these are the interactions, the London dispersion forces, the Vanderbilt bonds between the adjacent red tails as shown in this diagram. And this is a stabilized system. So lipids such as ionized fatty acids will spontaneously form mice cells in water.