Researchers at the University of Osaka have engineered artificial channels that can repeatedly open and close, much like natural biological ion channels. This scientific advance, published in Nature Communications on February 18, 2026, marks a major step forward for nanotechnology. The team successfully cycled these "breathing" channels hundreds of times without failure, opening doors for new developments in DNA sequencing, brain-inspired computing, and tiny molecular reactors.[indiandefencereview+1]
Mimicking Nature's Design
Biological ion channels are vital structures in living cells. They are incredibly narrow protein tunnels in cell membranes that control the flow of charged particles. This precise regulation creates the electrical signals needed for every heartbeat and nerve impulse. Recreating such exact structures in a lab has been a long-standing challenge for nanotechnology. The tightest parts of these natural channels are only a few angstroms wide, about the size of a single atom.This makes building them precisely very difficult.[indiandefencereview+3]
The Osaka team found a new way around this complex fabrication problem. Instead of trying to carve atom-sized pores directly, they built a miniature electrochemical reactor.This tiny system forms and dissolves the channels using chemistry itself as the tool.[indiandefencereview+1]
How the Channels "Breathe"
The core of the new system is a nanopore, a tiny hole drilled into a silicon nitride membrane. This membrane is only 30 nanometers thick.The nanopore acts as a reaction chamber, not the channel itself.[indiandefencereview+1]
When researchers apply a negative electrical voltage across this membrane, manganese and phosphate ions are drawn into the pore.Inside, these ions react and form a solid layer, effectively sealing the pore shut.To open the channel again, the voltage is simply reversed. This causes the solid plug to dissolve.[indiandefencereview+5]
What happens next is key: as the solid layer thins out, tiny pores, smaller than a nanometer, spontaneously pierce through it. These then reseal as the electric field brings back the precipitation process.Lead author Makusu Tsutsui noted that his team repeated this process of opening and closing the channels hundreds of times over several hours. He described the reaction scheme as "robust and controllable."The system maintained its behavior without breaking down across 756 consecutive voltage cycles, which spanned more than ten hours.[indiandefencereview+2]
Precision Through Chemistry
One of the most remarkable features of this system is how precisely it can be controlled without any mechanical parts.Senior author Tomoji Kawai explained that researchers can adjust the size and transport properties of these tiny pores by changing the makeup and pH level of the solutions used in the reaction.For example, by lowering the pH on one side of the membrane with hydrochloric acid, the team could tune the average pore diameters from about 2 nanometers to 7 nanometers.This level of sub-nanometer precision was achieved purely through chemical adjustments to the solution.[indiandefencereview+3]
The type of ions present also plays a role in how the channels behave. Adding potassium fluoride, for instance, increased the rate of ionic current spiking by six times and led to larger electrical signals.This is because fluoride ions are smaller and can pass through channels that would block larger ions.In contrast, iodide ions were too large to pass through and created a distinct negative pulse, as their bulk at the pore entrance blocked the flow of other particles.The study showed that these different behaviors could coexist when both types of ions were present at the same time. This means pore selectivity can be precisely controlled just by choosing different ions.[indiandefencereview+3]
Impact and Future Potential
This breakthrough addresses a long-standing problem in nanopore research: generating enough reliable channel events to systematically study how ions move.The researchers compare this to a technique from the 1990s, called mechanically controllable break junctions, which transformed molecular electronics by allowing repeated formation and measurement of single-molecule contacts.They argue that their chemically controllable break membrane offers a similar capability for fluidic systems, allowing thousands of angstrom-scale channels to be formed, measured, and reformed within a single device.[indiandefencereview+2]
The ability to create and control these artificial "breathing" channels holds significant promise for various advanced technologies. It could revolutionize DNA sequencing by providing new ways to read genetic material.The technology also has potential for brain-inspired computing, also known as neuromorphic computing, which aims to mimic the human brain's neural networks.Furthermore, these channels could be used to develop molecular-scale reactors, which are tiny chemical factories operating at an incredibly small scale.[indiandefencereview+8]
The University of Osaka's research provides a fundamental new tool for understanding and manipulating molecular transport. This could lead to a new generation of devices that integrate biology-inspired functions into artificial systems.
