At the University of Stuttgart, researchers have looked to the butterfly's proboscis — that delicate, coiling tongue — and found in its motion a principle for building machines at the edge of the visible world. By engineering ultrathin ceramic films that roll and unroll in response to magnetic fields, Dr. Zaklina Burghard's team has created microscrolls capable of lifting thirty times their own weight, surviving thousands of cycles, and working in coordinated arrays. The deeper achievement is not the scroll itself, but the manufacturing platform behind it — a method transferable across materia
Butterfly-Inspired Ceramic Microscrolls Offer Programmable Actuation for Future Robots
The real innovation is the scrolling platform itself.
Mark
Why start with a butterfly? There are plenty of other natural hinges and joints to study.
Mimi
The butterfly's proboscis isn't about the hinge itself—it's about the motion. That rolling and unrolling is elegant, repeatable, and it doesn't require complex joints or articulations. We were looking for a simple mechanical principle we could translate into something we could manufacture and control.
Mark
And you landed on rolling ceramic. That seems counterintuitive. Ceramics break.
Mimi
They do, but only if they're thick and rigid. When you make them ultrathin and give them the right internal structure—layered at scales smaller than you can see—they become flexible. It's like the difference between a ceramic plate and a ceramic fiber. Same material, completely different behavior.
Mark
The magnet control is clever. But why magnetic iron oxide specifically?
Mimi
It lets us trigger the motion remotely, without wires or contact. You bring a magnet close, the particles align, and the scroll unfurls. Remove the magnet, and it relaxes back. It's programmable without being complicated.
Mark
Five thousand cycles is impressive. What fails first in other actuators at that scale?
Mimi
Usually the material fatigues, or the connection points break. We don't have those failure modes because the whole thing is one continuous material. There's nothing to snap off.
Mark
You keep saying this is a platform, not just an actuator. What does that mean for someone outside materials science?
Mimi
It means we've figured out how to manufacture something, not just built one thing. Once you have a platform, you can swap in different materials and get different properties. Vanadium pentoxide is our proof of concept, but the method works for ceramics, polymers, composites—whatever you need for the job.
Mark
So a surgeon could theoretically use these in a microrobot inside a patient's body?
Mimi
That's one application, yes. But also industrial assembly at tiny scales, sensors that respond to magnetic fields, energy storage devices. The platform is broader than any single use.
Il Polso
- Ceramics have long been considered too brittle for flexible applications, making the Stuttgart team's achievement of a ceramic actuator that bends like fabric a genuine materials science disruption.
- Microscrolls measuring only micrometers across can lift more than thirty times their own weight, placing them among the most force-efficient actuators at this scale.
- A simple razor-blade peeling process transforms ultrathin vanadium pentoxide films embedded with magnetic nanoparticles into functional three-dimensional scrolls in seconds — no complex fabrication required.
- After 5,000 actuation cycles without degradation, and with the ability to form coordinated arrays, these devices are moving from laboratory curiosity toward viable microrobotic deployment.
- The team's emphasis is on the platform, not the prototype — the same scrolling method can be extended to diverse materials, opening pathways to sensors, energy storage, and medical microdevices.
At the University of Stuttgart, researchers have looked to the butterfly's proboscis — that delicate, coiling tongue — and found in its motion a principle for building machines at the edge of the visible world. By engineering ultrathin ceramic films that roll and unroll in response to magnetic fields, Dr. Zaklina Burghard's team has created microscrolls capable of lifting thirty times their own weight, surviving thousands of cycles, and working in coordinated arrays. The deeper achievement is not the scroll itself, but the manufacturing platform behind it — a method transferable across materials, pointing toward a future of programmable microsystems in medicine, energy, and beyond.
A butterfly's proboscis — the way it unfurls and recoils with quiet precision — became the unlikely inspiration for a new class of microscale actuators developed at the University of Stuttgart. Dr. Zaklina Burghard and her team at the Institute for Materials Science spent years investigating how nature constructs materials that bend without breaking, a quality almost entirely absent from conventional ceramics. Their answer was hierarchical structure: by engineering films layered at both the nano and micro scales, they produced a ceramic that flexes rather than shatters.
The manufacturing process they developed is strikingly direct. A razor blade peels an ultrathin film of vanadium pentoxide from its substrate, and the continuous bending of the released material coaxes it into a tightly wound scroll. Embedded throughout the film are magnetic iron oxide nanoparticles — bring a magnet close, and the scroll unfurls; remove it, and the scroll recoils. The cycle repeats without meaningful degradation across more than five thousand trials.
The resulting microscrolls are a few hundred micrometers in diameter when coiled, yet stretch to 25 millimeters when open and can lift more than thirty times their own weight. Arranged into programmable arrays, multiple scrolls can act in concert to lift, transport, and manipulate objects at scales inaccessible to human hands.
Burghard is careful to locate the real innovation not in the vanadium pentoxide scroll itself, but in the underlying platform — a manufacturing approach applicable to a wide range of organic and inorganic materials. The work grew from a German research foundation project, with foundational experiments conducted by Semi Kim during her 2023 master's thesis. What began as an observation of nature has since expanded into a multidisciplinary effort whose most consequential applications, Burghard suggests, remain ahead.
A butterfly's proboscis unfurls and recoils with an elegance that caught the attention of materials scientists at the University of Stuttgart. That simple, repeated motion—the rolling and unrolling—became the seed for something entirely new: tiny ceramic scrolls that can be commanded to open and close by nothing more than the presence or absence of a magnetic field.
Dr. Zaklina Burghard and her team at the Institute for Materials Science have spent years studying how nature builds materials that bend without breaking. Most ceramics are brittle, prone to shattering under stress. But Burghard's group discovered that by engineering ultrathin films with a hierarchical structure—layered at the nano and micro scales—they could create ceramic that flexes like fabric. They took this insight and built something practical: a manufacturing platform that transforms these delicate films into three-dimensional microscrolls in seconds.
The process is deceptively simple. A razor blade, used almost like a woodworking plane, peels an ultrathin film of vanadium pentoxide from its substrate. As the blade works, it continuously bends the released material, coaxing it into a tightly wound scroll. The films themselves contain magnetic iron oxide nanoparticles embedded throughout. When a magnet approaches, the microscroll rapidly unfurls. Remove the magnet, and it rolls back up again. The cycle can repeat thousands of times without degradation.
The numbers reveal the engineering achievement. These scrolls measure only a few micrometers across when coiled—a few hundred micrometers in diameter. Unrolled, they stretch to 25 millimeters. Despite their minuscule mass, they can lift more than thirty times their own weight. In testing, the microscrolls performed flawlessly through five thousand cycles. They can be arranged into arrays, allowing multiple actuators to work in concert, lifting, transporting, and manipulating objects at scales where human hands cannot reach.
Burghard emphasizes that the actuator itself is not the real innovation. The breakthrough is the platform—the manufacturing method that can be applied to many different materials, organic and inorganic alike. Vanadium pentoxide was chosen as the initial model because of Burghard's long research history with it, but the principle extends far beyond. The same scrolling process could enable future sensors, energy-storage systems, and other microsystems tailored to specific needs.
The work emerged from a German research foundation project, with Semi Kim conducting the foundational experiments during her master's thesis in 2023. The team has since expanded and refined the concept, integrating insights from physics, chemistry, computational modeling, and materials design. What began as an observation of nature—how a butterfly manages its proboscis—has become a platform for building the programmable microsystems that soft robots and medical microdevices will need. The real applications, Burghard suggests, are still ahead.
Citazioni salienti
We created a manufacturing platform that transforms ultrathin functional films into programmable three-dimensional ceramic microscrolls within seconds.— Dr. Zaklina Burghard, University of Stuttgart
The real innovation is the scrolling platform itself. It can be transferred to many different organic and inorganic thin-film materials.— Dr. Zaklina Burghard
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