Liquid crystal adopts new alignment

Abstract

Liquid crystals are ubiquitous in displays from digital watches to high-definition TVs. Almost 100 years after the discovery of liquid crystals, researchers have proved that a liquid crystal exists in a form that represents a new phase of these materials (PNAS 2020, DOI: 10.1073/pnas.2002290117). Liquid crystals contain parallel rod–shaped molecules. Though polar, the molecules’ heads and tails are oriented randomly, so the overall material doesn’t have uniform polarity. Other groups of scientists recently reported that they created liquid crystals with microscopic areas of polarity (Phys. Chem. Chem. Phys. 2017, DOI: 10.1039/C7CP00456G and Phys. Rev. X 2018, DOI: 10.1103/PhysRevX.8.041025). Noel A. Clark and colleagues at the University of Colorado, Boulder, now show that the materials in those earlier studies can have macroscopic areas of uniform polarity when the molecules are sandwiched between glass plates. Because the material has overall polarity, Clark and other experts say, it will produce optical effects faster