Hull coating responds to stimulus to remove bacteria

This build-up on ships increases drag and reduces the energy efficiency of the vessel, as well as blocking or clogging undersea sensors.

The material is said to work by physically moving at the microscopic level, thereby removing the bacteria away and avoiding the use of bacteria-killing paints, which can contain heavy metals or other toxic chemicals that might accumulate in the environment.

The Duke researchers also say that similar types of materials could be used in other settings where the build-up of bacteria (biofilms) presents problems, such as on the surfaces of artificial joint implants or water purification membranes.

‘We have developed a material that “wrinkles”, or changes its surface in response to a stimulus, such as stretching or pressure or electricity,’ said Duke engineer Xuanhe Zhao, assistant professor in Duke’s Pratt School of Engineering. ‘This deformation can effectively detach biofilms and other organisms that have accumulated on the surface.’

The results of the Duke studies were published online in the journal Advanced Materials.