Active particles can be used to model various biological processes like groups of bacteria or even flocks of birds. Until now, the shape of active prolate ellipsoids has not been optimized to make...Show moreActive particles can be used to model various biological processes like groups of bacteria or even flocks of birds. Until now, the shape of active prolate ellipsoids has not been optimized to make these particles move in a straight line. This is particularly interesting because a straight moving particle can be used as a basis to model these biological systems. Simulations were done to optimize the shape of prolate ellipsoids for straightness of path and four variables are defined that quantify this. The paths of active prolate ellipsoids with a long semi axis of 5 μm and a short semi axis between 1 and 4.9 μm were simulated in C, and the straightness of path was compared using the variables. The simulations suggest that particles with a larger short semi axis follow straighter paths, although this needs to be supported by empirical results.Show less
Metamaterials exhibit exotic properties derived from their geometric structures. A procedure has recently been developed to build reconfigurable structures from convex polyhedra. While initally...Show moreMetamaterials exhibit exotic properties derived from their geometric structures. A procedure has recently been developed to build reconfigurable structures from convex polyhedra. While initally characterized as rigid, we found that some of these structures possess multiple stable configurations. In the present study we develop numerical tools to simulate all possible deformations that can be applied to these structures, mapping the corresponding energy landscape. We use the simulation to identify the additional stable configurations and study their dependence on key physical parameters. Based on the results found, we explain the mechanism behind the observed multistability and suggest its validity as fundamental ingredient for a general designing rule. Finally, we explore the possibility of implementing our results into the development of a reconfigurable, multistable and multifunctional 3D material.Show less
