Nanotechnology researchers at Rice University in Houston, Texas, US have unveiled a solar-powered sterilisation system that could be used to sterilise medical instruments and help more than 2.5 billion people who lack adequate sanitation. The 'solar steam' system uses nanomaterials to convert as much as 80% of the energy in sunlight into germ-killing heat.
The technology is described online in the Proceedings of the National Academy of Sciences Early Edition. In the paper, researchers from Rice’s Laboratory for Nanophotonics (LANP) show two ways that solar steam can be used for sterilisation — one set up to clean medical instruments and the other to sanitise human waste.
'Sanitation and sterilisation are enormous obstacles without reliable electricity,' said Rice photonics pioneer Naomi Halas, Director of LANP and leading researcher on the project, with senior co-author and Rice professor Peter Nordlander. 'Solar steam’s efficiency at converting sunlight directly into steam opens up new possibilities for off-grid sterilisation that simply aren’t available today.'
In a previous study last year, Halas and colleagues showed that solar steam was so effective at direct conversion of solar energy into heat that it could even produce steam from ice water.
'It makes steam directly from sunlight,' she said. 'That means the steam forms immediately, even before the water boils.'
Solar steam’s efficiency at converting sunlight directly into steam opens up new possibilities for off-grid sterilisation
Halas, Rice’s Stanley C. Moore Professor in Electrical and Computer Engineering, professor of physics, professor of chemistry and professor of biomedical engineering, specialises in creating and studying light-activated particles. One of her creations, gold nanoshells, is the subject of several clinical trials for cancer treatment.
Solar steam’s efficiency comes from light-harvesting nanoparticles that were created at LANP by Rice graduate student Oara Neumann, the leading author on the PNAS study. Neumann created a version of nanoshells that converts a broad spectrum of sunlight — including both visible and invisible bandwidths — directly into heat. When submerged in water and exposed to sunlight, the particles heat up so quickly that they instantly vaporise water and create steam. The technology has an overall energy efficiency of 24%. Photovoltaic solar panels, by comparison, typically have an overall energy efficiency of around 15%.
When used in the autoclaves in the tests, the heat and pressure created by the steam were sufficient to kill not just living microbes but also spores and viruses. The solar steam autoclave was designed by Rice undergraduates at Rice’s Oshman Engineering Design Kitchen and refined by Neumann and colleagues at LANP. In the PNAS study, standard tests for sterilisation showed the solar steam autoclave could kill even the most heat-resistant microbes.
Halas said her team hopes to work with waste-treatment pioneer Sanivation to conduct the first field tests of the solar steam waste steriliser at three sites in Kenya.
The research was supported by a Grand Challenges grant from the Bill & Melinda Gates Foundation and by the Welch Foundation.