Algae, often seen as simple organisms, have proven to be powerful tools in the world of nanotechnology. Researchers at the University of Tokyo have successfully harnessed the movement of green algae cells to power micromachines, creating a miniature “scooter” and “rotator” that demonstrate the potential of algae-driven technology.
The inspiration for this study came from the impressive swimming capabilities of Chlamydomonas reinhardtii, a common type of algae. Despite their small size, these algae can move at a remarkable speed of 100 microns per second. By trapping these algae in basket-like structures, researchers were able to attach them to micromachines and utilize their motion to propel the devices.
Using cutting-edge 3D printing technology, known as two-photon stereolithography, the researchers fabricated the micromachines with precision at a scale of 1 micrometer. The “scooter” and “rotator” designs allowed the algae to move the devices in different ways, showcasing a range of dynamic motions from straightforward movement to smooth rotation.
The team observed that the collective movement of multiple algae influenced the motion of the micromachines, prompting further investigation into this behavior. While the green algae cells have a short lifespan of about two days, they are able to reproduce during this time, making them ideal for powering micromachines without the need for chemical modifications or external guidance structures.
The potential applications of these algae-powered micromachines are vast, particularly in environmental engineering and research. The researchers plan to continue improving the design of the micromachines to achieve faster speeds and create more complex models. Professor Shoji Takeuchi, who supervised the project, believes that these methods could evolve into a technology for environmental monitoring in aquatic environments and substance transport using microorganisms.
The findings of this study were published in the journal Small, highlighting the innovative use of algae in nanotechnology. This breakthrough opens up new possibilities for utilizing natural elements in the development of advanced microscale technology, paving the way for future advancements in the field. The collaboration between biological organisms and artificial devices demonstrates the potential for sustainable and efficient solutions in various industries.
