Energy Dissipation by Metamorphic Micro-Robots in Viscous Fluids

TL;DR

This paper analyzes the energy dissipation of shape-changing micro-robots in viscous fluids, highlighting the dominance of surface forces and the feasibility of rapid shape changes with future material improvements.

Contribution

It provides theoretical estimates of energy dissipation for metamorphic micro-robots, emphasizing the importance of surface forces and suggesting simplified control strategies.

Findings

Surface forces dominate energy dissipation at microscopic scales.

Robots can change shape rapidly in viscous fluids with sufficient power.

Uniform speed shape changes are nearly as efficient as optimized variations.

Abstract

Microscopic robots could perform tasks with high spatial precision, such as acting on precisely-targeted cells in biological tissues. Some tasks may benefit from robots that change shape, such as elongating to improve chemical gradient sensing or contracting to squeeze through narrow channels. This paper evaluates the energy dissipation for shape-changing (i.e., metamorphic) robots whose size is comparable to bacteria. Unlike larger robots, surface forces dominate the dissipation. Theoretical estimates indicate that the power likely to be available to the robots, as determined by previous studies, is sufficient to change shape fairly rapidly even in highly-viscous biological fluids. Achieving this performance will require significant improvements in manufacturing and material properties compared to current micromachines. Furthermore, optimally varying the speed of shape change only slightly reduces energy use compared to uniform speed, thereby simplifying robot controllers.