2D chiral gold tetrahedron nanoparticle self-assembly (IMAGE) Rice University Caption Tetrahedrons form hexagonal domains with either a right-handed or left-handed twist. During assembly, the particles come together with their tips facing either up or down. When the points meet, the particles must slide past one another to continue getting closer together, and this movement forces all six particles in an assembling hexagon to randomly rotate to the left or right. Credit Image by Z. Cheng/Rice University Usage Restrictions Must credit: Z. Cheng/Rice University License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.