Researchers Built Salt-Shedding Solar Evaporator
A new bilayer device manages hypersaline brines by limiting crust accumulation to under 10% through passive shedding.
Updated on Sept. 28, 2026 in Energy
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Researchers have developed a solar-driven evaporator-crystallizer that maintains operational stability when treating extreme hypersaline brines. The system is a research-stage device designed to address the persistent salt accumulation that historically hinders the long-term performance of solar evaporators.
Why it matters
Persistent salt crystallization on evaporator surfaces restricts fluid evaporation, limiting the viability of passive solar-driven water treatment. This research provides a mechanical approach to managing extreme salinity levels, which are essential for sustainable mineral extraction and brine desalination.
The device operates at a net evaporation flux of 1.2 kg per square meter per hour under extreme salinity conditions of 20 weight percent. This performance is maintained by restricting salt crust coverage to less than 10% during testing.
The players
Nature
An international scientific journal that publishes peer-reviewed research across all areas of science and technology.
The details
The system utilizes a bilayer architecture consisting of a nanostructured titanium mesh and a photothermal b-PDMS (polydimethylsiloxane) layer. By localizing light absorption at the top surface, the device promotes unidirectional vapor generation, which pushes salt crystallization toward the edges. Because the material maintains low interfacial adhesion, the salt crust is passively shed from the structure overnight.
Timeline
12 hours was the duration of the device illumination test.
The Tech Race
This development pushes forward the field of solar-driven interfacial evaporation research by addressing the critical issue of salt-induced degradation. It marks a departure from traditional passive systems that rely on external maintenance or cleaning to clear crust buildup.
The technology is currently at the research stage and is not available for immediate deployment in industrial or personal water treatment settings. Future applications will depend on successful scaling of the titanium mesh architecture to larger, cost-effective surface areas.
The takeaway
The successful application of passive salt-shedding architectures is a key step toward making hypersaline brine treatment economically viable. Future developments to watch include the transition of this titanium-mesh design from lab-scale prototypes to long-term endurance field trials.
Further reading
For broader context on current innovations in sustainable power and water, visit our Energy section.
More information
View the peer-reviewed research article for a complete breakdown of the device's experimental performance.
Source note: This article includes information reported by Nature.
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