It is difficult to make colloidal spheres self-assemble into photonic crystals, which are valued for their optical properties. A team of engineers and scientists report they have found a pathway toward the self-assembly of these elusive photonic crystal structures never assembled before on the sub-micrometer scale.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2017/02/170228185355.htm
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