The study, published in the journal Science Advances, uses computer simulations to demonstrate that the chaotic swarming effect of dense active matter such as bacteria can be organised to turn cylindrical rotors and provide a steady power source.
Researchers say these biologically driven power plants could someday be the microscopic engines for tiny,
Dense bacterial suspensions are the quintessential example of active fluids that flow spontaneously. While swimming bacteria are capable of swarming and driving disorganised living flows, they are normally too disordered to extract any useful power from.
But when the Oxford team immersed a lattice of 64 symmetric microrotors into this active fluid, the scientists found that the bacteria spontaneously organised itself in such a way that neighbouring rotors began to spin in opposite directions — a simple structural organisation reminiscent of a windfarm.
Dr Shendruk added: ‘The amazing thing is that we didn’t have to
‘When we did the simulation with a single rotor in the bacterial turbulence, it just got kicked around randomly. But when we put an array of rotors in the living fluid, they suddenly formed a regular pattern, with neighbouring rotors spinning in opposite directions.’
‘At micro scales, our simulations show that the flow generated by biological assemblies is capable of reorganising itself in such a way as to generate a persistent mechanical power for rotating an array of microrotors.’
Senior author Professor Julia Yeomans, from Oxford University’s Department of Physics, added: ‘Nature is brilliant at creating tiny engines, and there is enormous potential if we can understand how to exploit similar designs.’