A research team at The Hong Kong University of Science and Technology (HKUST) has achieved a major scientific breakthrough by developing the first artificial cilia system capable of replicating the fast, complex, three-dimensional motion of natural cilia found throughout the human body. The study, recently published in Nature titled “ 3D-printed low-voltage-driven ciliary hydrogel microactuators ”, marks a significant advance in soft robotic materials and bio‑inspired micro‑engineering.
Cilia—microscopic hair-like structures—play vital roles in clearing mucus from the lungs, circulating cerebrospinal fluid in the brain, and supporting reproductive processes. For decades, scientists have sought to recreate their sophisticated mechanics, but achieving realistic motion in engineered systems has remained a persistent challenge.
Led by Prof. HU Wenqi, Assistant Professor of the Department of Mechanical and Aerospace Engineering at HKUST , the research team overcame this challenge by integrating multiple cutting‑edge technologies into the design of the artificial cilia. A high‑precision 3D‑printing method enabled the fabrication of ultra‑small, soft structures that closely emulate the flexibility of natural cilia. The hydrogel’s internal architecture was optimized to allow rapid ion transport, giving the cilia their fast, responsive motion. A custom miniature electrode system further allows each cilium to be individually addressed, enabling highly coordinated, programmable movement. Together, these innovations achieve levels of speed, complexity, and durability previously unattainable in artificial cilia systems.
The HKUST team also led the collaboration with the Max Planck Institute for Intelligent Systems (MPI-IS) in Stuttgart, which contributed world‑leading expertise in microrobotics and experimental validation, and Koç University in Turkey, which provided strengths in physical intelligence and system-level integration.
Through this collaboration, the researchers successfully created hydrogel-based microcilia capable of rapid, precise movement driven by extremely low-voltage electrical stimulation—comparable to the voltage of a typical household battery. Each cilium contains mobile charged particles that shift under an applied electric field, causing controlled bending. By adjusting how electrical signals are delivered, the team can generate complex bending and rotational patterns that closely mimic those observed in living organisms.
Prof. Hu said, "Earlier attempts at artificial cilia were always limited—they were too slow, too stiff, or lacked fine control. Our design brings all the essential characteristics of natural cilia together for the first time: softness, speed, durability, and the ability to coordinate motion across large arrays."
He noted, "Our work provides a critical first step to study how cilia work in health and lays the foundation for future medical and engineering applications that rely on precise fluid movement at very small scales."
Ensuring long-term safety and biocompatibility will be essential as technology moves toward clinical applications. The HKUST team is now working to transition from laboratory demonstrations to more application-oriented systems, including scaling up fabrication, integrating sensing and feedback control, and testing performance in realistic biological environments.
Beyond potential medical uses, artificial cilia also open exciting possibilities across multiple technological fields. They can function as miniature pumps or mixers in microfluidic systems, eliminating the need for bulky mechanical components. In robotics, their gentle yet precise motion could enable new forms of locomotion or manipulation for extremely small robots operating in tight or complex environments. The technology may further benefit advanced manufacturing, environmental sensing, and even soft wearable devices—any setting where efficient, controllable motion at microscopic scales is essential.
This study forms part of a broader international research effort in bio‑inspired microrobotics, which aims to develop tiny machines that move and interact with their surroundings in ways inspired by living systems.
Nature
Experimental study
Not applicable
3D-printed low-voltage-driven ciliary hydrogel microactuators
14-Jan-2026