Researchers Discover Efficient Backward-Sliding Locomotion Mechanism Inspired by Diatoms
Scientists have identified a novel swimming mechanism in diatom colonies based on sliding between neighboring cells, which propels organisms backward while achieving higher speeds and greater energy efficiency than traditional undulatory swimming. This sliding-based locomotion differs fundamentally from the wave-based propulsion seen across biological scales, from sperm cells to whales. The findings suggest that hydrodynamic efficiency may have driven the evolution of diatom colony structures and could inspire new designs for microswimmers and robotic systems.
Researchers studying diatom colonies have discovered a previously unrecognized mode of locomotion based on internal sliding between stacked elongated cells. Unlike classical undulatory swimming, where traveling deformation waves generate thrust in the direction opposite to wave propagation, this sliding mechanism generates internal shear that drives propulsion while the organism moves backward relative to the wave direction. The study demonstrates that this approach achieves both higher speeds and greater energetic efficiency than traditional swimming methods. Notably, optimal performance occurs at wavelengths much larger than the chain length and at cell aspect ratios that match those found in natural diatom colonies, suggesting that hydrodynamic efficiency may have been an evolutionary selective pressure. The research identifies sliding as a fundamental locomotion mode in multicellular assemblies and proposes new design principles applicable to bio-inspired microswimmers and swarm robotic systems.
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- arXiv physicsCenter
Moving backward to go faster: Diatom-inspired sliding reveals efficient modes of locomotion
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