lamellar phase

The lamellar phase is a type of liquid crystal structure where molecules are arranged in layers. This phase exhibits properties between those of a solid and a liquid. In a lamellar phase, translational symmetry is broken in one direction (perpendicular to the layers) but remains continuous in the other two directions within the layers. This means molecules can move freely within their layers but are restricted in their movement between layers. Soap molecules, for example, can form a lamellar phase, often referred to as "neat soap," where their dual chemical nature (hydrophobic tails and hydrophilic heads) drives the formation of these layered structures. This arrangement allows the layers to slide past each other, contributing to the slippery feel of soap.1