A colloidal viewpoint on the finite sphere packing problem: the sausage catastrophe

Autor: Marín-Aguilar, Susana, Camerin, Fabrizio, van der Ham, Stijn, Feasson, Andréa, Vutukuri, Hanumantha Rao, Dijkstra, Marjolein
Rok vydání: 2023
Předmět:
Druh dokumentu: Working Paper
Popis: It is commonly believed that the most efficient way to pack a finite number of equal-sized spheres is by arranging them tightly in a cluster. However, mathematicians have conjectured that a linear arrangement may actually result in the densest packing. Here, our combined experimental and simulation study provides a realization of the finite sphere packing problem by studying non-close-packed arrangements of colloids in a flaccid lipid vesicle. We map out a state diagram displaying linear, planar and cluster conformations of spheres, as well as bistable states which alternate between cluster-plate and plate-linear conformations due to membrane fluctuations. Finally, by systematically analyzing truncated polyhedral packings, we identify clusters of $56\leq N \leq 70$ spheres, excluding $N=57$ and 63, that pack more efficiently than linear arrangements.
Databáze: arXiv