What is the difference between linear chains and rings composed of the same material? The molecular building blocks are identical, but from a mathematical point of view the structures have distinct topologies, ring and linear chain. This difference is readily recognizable on a macroscopic scale, but represents a tricky task on the microscopic scale. Physicists have investigated strategies to separate nano- and microparticles of distinct topology.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2017/12/171206092115.htm
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