Here, we are required to provide the cause of the spontaneous formation of membranes when phospholipids are mixed with water.
Phospholipids spontaneously form membranes when mixed with water because they have a polar(hydrophilic) head (the phosphate) and a nonpolar(hydrophobic) tail (the lipids), as a result of their amphipathic nature.
A phospholipid is characterized by its two main parts as evident in its name, a phosphate group and a lipid. As a result of its negative charge, the phosphate group is polar.
Phospholipids are amphipathic.
Consequently, they are partly hydrophilic and partly hydrophobic. As such, when phospholipids are dropped in water, often they will spontaneously form membranes. This is a special arrangement where the hydrophobic tails group up on the inside of the bead while the hydrophilic heads make up the outer surface. Consequently, the hydrophilic area is that which comes into contact with the water while the hydrophobic area hides in the interior of the membrane formed.
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