Soap with water forms :

Soap molecules are amphiphilic, having a hydrophilic head and hydrophobic tail. When dissolved in water at appropriate concentrations, they self-assemble into ordered structures like micelles and lamellar phases, forming a lyotropic liquid crystal. Lyotropic liquid crystals are formed by amphiphilic molecules in a solvent (typically water), with their structure depending on concentration. Thermotropic liquid crystals depend on temperature only and are formed by pure compounds, not solutions.