Chemists align soft quasicrystals over millimeter scales in the lab

Molecules can organize themselves into ordered patterns without anyone placing each piece. Soft quasicrystals are one of the stranger outcomes of that process: their patterns never repeat the way a conventional crystal's does. Making them with a single, uniform orientation across a large area has remained a major challenge.

At National Taiwan University, the team led by Mayumi Egashira and Chien-Lung Wang began with a question about pathways. They found that the same molecules can follow different assembly routes depending on temperature and molecular interactions. By tracking how the structures changed over time, they saw an initially formed 12-fold quasicrystal gradually transform into other ordered structures, each under different conditions. The final structure depends on how the molecules rearrange along the way.

That observation led to a method the researchers call vapor-induced self-assembly, or VISA. The aim was to reach a route that is normally hard to access: a reverse transformation back toward the quasicrystal. By carefully controlling vapor treatment and cooling, they guided the molecules along that route, which let them form highly oriented quasicrystals while suppressing competing orientations. The result is a soft quasicrystal extending over millimeter-scale regions, with its 12-fold pattern oriented uniformly across the material.

What changes is the way researchers think about the problem. Wang's team argues that controlling the assembly path, not just the final structure, opens access to ordered materials that conventional methods struggle to produce. The study does not name a practical use for these materials, and it gives no timeline for moving beyond the laboratory. The reported result is a laboratory demonstration of one material pattern, so the gain for materials chemists is a method to test, not a product to buy.

For now, the advance belongs to people who design soft materials and need large areas of uniform molecular order. Whether the VISA approach works on other molecules or at larger scales is not addressed in the study's reporting, and that is the next thing to watch.