SonoTransformers: the first instance of acoustic transformable micromachines

What is it about?

We introduce “SonoTransformer,” the acoustically activated micromachine that delivers shape transformability using preprogrammed soft hinges with different stiffnesses. When exposed to an acoustic field, these hinges concentrate sound energy through intensified oscillation and provide the necessary force and torque for the transformation of the entire micromachine within milliseconds. We have created machine designs to predetermine the folding state, enabling precise programming and customization of the acoustic transformation. Additionally, we have shown selective shape transformable microrobots by adjusting acoustic power, realizing high degrees of control and functional versatility.

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Photo by Yassine Ait Tahit on Unsplash

Photo by Yassine Ait Tahit on Unsplash

Why is it important?

Shape transformation, a key mechanism observed in organisms for survival and adaptation, has seen tremendous growth in synthetic shape-shifting systems. However, developing transformable machines at the microscale remains a fundamental challenge. Furthermore, despite various actuation approaches, acoustics have received limited attention. Here, we present “SonoTransformers,” acoustically activated transformable micromachines. We found that applied sound energy can be trapped and amplified on the soft hinge, causing deformation of the entire micromachine within milliseconds. Multiple hinges are designed to predetermine the folding state, enabling precise programming and customization of the acoustic transformation. With adjustable acoustic power, we showcase controlled and selective shape transformable microrobots, promising versatile applications in flexible electronics, medicine, and microengineering, offering new design paradigms and opportunities for future developments.

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