Low-Cost, Fly Footpad-Like Adhesive Structure Capable of Repeated Attachment/Detachment
Phoenix666 writes:
Low-cost, fly footpad-like adhesive structure capable of repeated attachment/detachment:
NIMS, HUE and HUSM have developed a method of easily and cheaply producing an adhesive structure capable of repeated attachment and detachment. The design of this structure was inspired by the adhesive spatula-shaped hairs (setae) found on the footpads of flies, while the method of producing it was hinted at by seta formation in fly pupae. These environmentally sound technologies could potentially contribute to a more sustainable society.
[...] This research group focused on biological adhesive structures (e.g., insect footpads) known to form in an energy efficient manner at room temperature. The group developed adhesive structures and efficient methods of creating them by mimicking biological processes. In this research project, the group specifically focused on the adhesive, spatula-shaped setae that grow on fly footpads as a model for the development of adhesive structures that can be repeatedly attached to and detached from objects. The group observed the biological process by which the setae are formed in pupal fruit flies (Drosophila melanogaster) by staining fly legs for immunohistochemical analysis and labeling cytoskeletal actin with fluorescent dyes. As a result, the group discovered that adhesive spatulate footpad setae are formed in a simple two-step process: (1) seta forming cells elongate and cytoskeletal actin filaments in the cells accumulate at the distal tips of the elongated cells, forming the spatula-like frameworks, and (2) cuticle deposits form on the surfaces of the setae, solidifying them. The group then succeeded in developing a similar, simple two-step process to fabricate an adhesive spatulate structure at room temperature by (1) stretching nylon fibers to form a spatulate structure and (2) solidifying it. The structure's adhesive strength and ease of detachment were confirmed to vary, depending on the direction in which it is pulled away from the object to which it is attached-similar to the mechanisms insects use to attach or detach themselves to/from objects. A single spatulate fiber is sufficiently strong to suspend a silicon wafer from it weighing 52.8 g. Extrapolating from this, a bundle of 756 fibers (9 cm2 in cross-sectional area) can be expected to support a person weighing 60 kg.
Other advances in this area have attempted to mimic gecko feet.
More information:
Ken-ichi Kimura et al, Framework with cytoskeletal actin filaments forming insect footpad hairs inspires biomimetic adhesive device design, Communications Biology (2020). DOI: 10.1038/s42003-020-0995-0
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