Engineers at The Australian National University (ANU) have developed a new spray-on material with a remarkable ability to repel water.
The new protective coating could eventually be used to waterproof mobile phones, prevent ice from forming on aeroplanes or protect boat hulls from corroding.
“The surface is a layer of nanoparticles, which water slides off as if it’s on a hot barbecue,” said PhD student William Wong, from the Nanotechnology Research Laboratory at the ANU Research School of Engineering.
The team created a much more robust coating than previous materials by combining two plastics, one tough and one flexible.
“It’s like two interwoven fishing nets, made of different materials,” Mr Wong said.
The water-repellent or superhydrophobic coating is also transparent and extremely resistant to ultraviolet radiation.
Lead researcher and head of the Nanotechnology Research Laboratory, Associate Professor Antonio Tricoli, said the new material could change how we interact with liquids.
“It will keep skyscraper windows clean and prevent the mirror in the bathroom from fogging up,” Associate Professor Tricoli said.
“The key innovation is that this transparent coating is able to stabilise very fragile nanomaterials resulting in ultra-durable nanotextures with numerous real-world applications.”
The team developed two ways of creating the material, both of which are cheaper and easier than current manufacturing processes.
One method uses a flame to generate the nanoparticle constituents of the material. For lower temperature applications, the team dissolved the two components in a sprayable form.
In addition to waterproofing, the new ability to control the properties of materials could be applied to a wide range of other coatings, said Mr Wong.
“A lot of the functional coatings today are very weak, but we will be able to apply the same principles to make robust coatings that are, for example, anti-corrosive, self-cleaning or oil-repellent,” he said.
The research is published in ACS Appl. Mater. Interfaces 2016, 8, 13615−13623.
