Micelle (polymers): Organized auto-assembly formed in a liquid and composed of amphiphilic macromolecules, in general amphiphilic di- or tri-block copolymers made of solvophilic and solvophobic blocks.Note 1: An amphiphilic behavior can be observed for water and an organic solvent or between two organic solvents.These highly mobile, spontaneously formed clusters came to be called micelles, a term borrowed from biology and popularized by G. Hartley in his classic book Paraffin Chain Salts: A Study in Micelle Formation.Individual surfactant molecules that are in the system but are not part of a micelle are called "monomers".This phase is caused by the packing behavior of single-tail lipids in a bilayer.
In a micelle, the hydrophobic tails of several surfactant molecules assemble into an oil-like core, the most stable form of which having no contact with water.
Although the closest counterions partially mask a charged micelle (by up to 90%), the effects of micelle charge affect the structure of the surrounding solvent at appreciable distances from the micelle.
Ionic micelles influence many properties of the mixture, including its electrical conductivity.
Micelles represent a molecular assembly, in which the individual components are thermodynamically in equilibrium with monomers of the same species in the surrounding medium.
In water, the hydrophilic "heads" of surfactant molecules are always in contact with the solvent, regardless of whether the surfactants exist as monomers or as part of a micelle.