Tech
UV light holds promise for energy-efficient desalination
A team of UC Riverside researchers has uncovered a potential breakthrough in solar desalination that could reduce the need for energy-intensive saltwater treatment.
Led by Luat Vuong, an associate professor of mechanical engineering in UCR’s Marlan and Rosemary Bourns College of Engineering, the team has demonstrated for the first time how the highest frequencies of sunlight—specifically invisible ultraviolet (UV) light—can break the stubborn bonds between salt and water.
“To our knowledge, nobody else has yet articulated this deep UV channel for salt-water separation,” Vuong said. “UV light in the wavelength range of 300–400 nanometers is used for disinfection, but this deep UV channel, around 200 nanometers, is not well known. We may be the first to really think about how you can leverage it for desalination.”
While much work remains before practical applications are developed, the discovery provides a clear path for further research and innovation.
Published in ACS Applied Materials & Interfaces, the study by Vuong and her colleagues details how the team made a wick from aluminum nitride—a hard, white ceramic—to separate salt from water by harnessing specific light wavelengths that interact with salt water without heating the bulk liquid.
Unlike traditional solar desalination methods, which rely on dark materials to absorb heat and boil water, Vuong’s approach could bypass the need for thermal processes altogether.
The experiments involved placing pairs of ceramic wicks in an enclosed chamber, with each allowed to equilibrate or adjust to similar environmental conditions. Under UV light, evaporation rates of salt water increased significantly compared to control samples kept in the dark or exposed to red, yellow, or infrared light.
“Aluminum nitride is well suited for emitting UV light due to its crystalline structure,” Vuong explained.
The material may be triggering a process called “photon upconversion,” in which low-energy photons combine into a single high-energy photon. That upconverted photon delivers a more powerful punch, potentially strong enough to break the salt-water bonds.
If this upconversion process occurs without generating excess heat, which is yet to be determined, the approach could offer a non-photothermal alternative to traditional solar desalination systems that boil or heat salt water to produce vapor, which then condenses into fresh water.
Such solar systems also could reduce the heavy electricity demands of reverse osmosis systems, which use high-pressure pumps to force salt water through membranes. The system could also address the concentrated reverse-osmosis brine waste, which is toxic to marine life when discharged into waterways.
Other potential applications for the wicking approach may be for other waste management processes, harvesting minerals in extreme environments, or replacing “swamp” coolers with salt water evaporation systems.
Still, Vuong emphasized that further research is needed before aluminum nitride-based solar desalination systems can be engineered for widespread use.
“Other materials may be designed to be just as effective, but aluminum nitride is practical. It is inexpensive, widely available, non-toxic, highly hydrophilic, and durable,” Vuong said.
Moving forward, Vuong’s group is designing system architectures, fabrication processes, and spectroscopic tools to better understand and enhance light-driven evaporation.
More information:
Navindra Singh et al, Spectrum Selective Interfaces and Materials toward Nonphotothermal Saltwater Evaporation: Demonstration with a White Ceramic Wick, ACS Applied Materials & Interfaces (2025). DOI: 10.1021/acsami.5c12331
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UV light holds promise for energy-efficient desalination (2025, November 4)
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Tech
New York Is the Latest State to Consider a Data Center Pause
Lawmakers in at least five other states—Georgia, Maryland, Oklahoma, Vermont, and Virginia—have also introduced bills this year that would impose various forms of temporary pauses on data center development. While Georgia, Vermont, and Virginia’s efforts are being led by Democrats, Oklahoma and Maryland’s bills were largely sponsored by Republicans. These bills mirror several moratoriums that have already passed locally: At the end of December, at least 14 states had towns or counties that have paused data center permitting and construction, Tech Policy Press reported.
There are some signs that the data center industry is beginning to respond to the backlash. Last month, Microsoft, with a boost from the White House, rolled out a set of commitments to be a “good neighbor” in communities where it builds data centers. In response to questions on how the industry is responding to the slew of state-level legislation, Dan Diorio, the vice president of state policy at the Data Center Coalition, an industry group, tells WIRED in a statement that it “recognizes the importance of continued efforts to better educate and inform the public about the industry, through community engagement and stakeholder education, which includes factual information about the industry’s responsible usage of water and our commitment to paying for the energy we use.”
Some of the states with moratorium bills have relatively few data centers: Vermont has just two, according to Data Center Map. But Georgia and Virginia are two of the national hubs for data center development and have found themselves at the center of much of the resistance, in both public reaction to data centers and legislative pushback. More than 60 data center-related bills have already been proposed in the Virginia legislature this year, according to Data Center Dynamics, an industry news site.
Josh Thomas is a state delegate in Virginia who has been at the forefront of leading the legislative charge to put limits on the expansion of data centers. During his first legislative session, in 2024, the caucus of self-identified data center “reformers” in both the House and Senate was just three politicians. That number grew to eight in 2025, “and now, it’s 12 or 13,” he says, with many more politicians willing to vote on reform bills. His fellow lawmakers, he says, now “understand that we need to negotiate where these things go.”
Last year, a proposal introduced by Thomas which would have required data centers to perform more in-depth environmental, noise, and community impact site assessments passed the legislature, but was vetoed by then-governor Glenn Youngkin. Newly-elected Governor Abigail Spanberger, a Democrat who talked about making data centers “pay their own way” on the campaign trail, seems much more likely to reconsider this year’s version of the bill, which has already passed the House.
“I’m much more optimistic that [Spanberger] will sign,” Thomas says.
Thomas, who was not involved in shaping the moratorium in the Virginia house, thinks that a moratorium on data centers is much more likely to pass in states where the industry has less of a foothold than Virginia. Still, he says, “it’s not a bad idea.”
Tech
More Than 800 Google Workers Urge Company to Cancel Any Contracts With ICE and CBP
More Than 800 employees and contractors working for Google signed a petition this week calling on the company to disclose and cancel any contracts it may have with US immigration authorities. In a statement, the workers said they are “vehemently opposed” to Google’s dealings with the Department of Homeland Security, which includes Immigration and Customs Enforcement (ICE) and Customs and Border Protection (CBP).
“We consider it our leadership’s ethical and policy-bound responsibility to disclose all contracts and collaboration with CBP and ICE, and to divest from these partnerships,” the petition published on Friday states. Google didn’t immediately respond to a request for comment.
US immigration authorities have been under intense public scrutiny this year as the Trump administration ramped up its mass deportation campaign, sparking nationwide protests. In Minneapolis, confrontations between protesters and federal agents culminated in the fatal shooting of two US citizens by immigration officers. Both incidents were captured in widely disseminated videos and became a focal point of the backlash. In the wake of the uproar, the Trump administration and Congress say they are negotiating changes to ICE’s tactics.
Some of the Department of Homeland Security’s most lucrative contracts are for software and tech gear from a variety of different vendors. A small share of workers at some of those suppliers, including Google, Amazon, and Palantir, have raised concerns for years about whether the technology they are developing is being used for surveillance or to carry out violence.
In 2019, nearly 1,500 workers at Google signed a petition demanding that the tech giant suspend its work with Customs and Border Protection until the agency stopped engaging in what they said were human rights abuses. More recently, staff at Google’s AI unit asked executives to explain how they would prevent ICE from raiding their offices. (No answers were immediately provided to the workers.)
Employees at Palantir have also recently raised questions internally about the company’s work with ICE, WIRED reported. And over 1,000 people across the tech industry signed a letter last month urging businesses to dump the agency.
The tech companies have largely either defended their work for the federal government or pushed back on the idea that they are assisting it in concerning ways. Some government contracts run through intermediaries, making it challenging for workers to identify which tools an agency is using and for what purposes.
The new petition inside Google aims to renew pressure on the company to, at the very least, acknowledge recent events and any work it may be doing with immigration authorities. It was organized by No Tech for Apartheid, a group of Google and Amazon workers who oppose what they describe as tech militarism, or the integration of corporate tech platforms, cloud services, and AI into military and surveillance systems.
The petition specifically asks Google’s leadership to publicly call for the US government to make urgent changes to its immigration enforcement tactics and to hold an internal discussion with workers about the principles they consider when deciding to sell technology to state authorities. It also demands Google take additional steps to keep its own workforce safe, noting that immigration agents recently targeted an area near a Meta data center under construction.
Tech
NordProtect Makes ID Theft Protection a Little Easier—if You Trust That It Works
Once I signed up, I had to fill out several online forms. These include information that might personally identify me, like my Social Security number, phone numbers, email addresses, credit/debit cards, and so on. Filling out the information took about 20 minutes. It’s not effortless, but NordProtect’s interface is clean and intuitive. It puts the information you want to see on top, often alongside brief but informative details, with the option to dive deeper. Notifications are rare, too, so you’re not peppered with distracting alerts.
The exception to this was the first time I logged in. I saw dozens of alerts associated with data breaches that occurred over the past two decades. Once those were dismissed, new notifications were uncommon. The interface can seem a bit too simple. I found it easy to forget exactly what the service was doing for me. NordProtect lacks a mobile app. The website works well enough on a smartphone, but a dedicated app would look better.
NordProtect didn’t provide me with any information or take any actions that had an easily quantifiable impact on my privacy. I looked at each of the 48 data breach alerts that appeared and found that none of them contained worrying information. Much of it was out of date (old passwords, ancient addresses, and so on). Some of it was just straight-up wrong.
NordProtect can offer financial safeguards, but I already have a freeze on my credit, and my bank provides free credit monitoring services. I already use a VPN, so NordVPN wasn’t new to me. The most tangible services I gained were identity theft insurance and access to Incogni. On the other hand, I gained less because I’m already somewhat active in monitoring my personal data. NordProtect would be more valuable if I were starting from scratch.
Doing the Math
NordProtect via Matthew Smith
NordProtect offers monthly, annual, and two-year plans, but the pricing pushes you hard toward yearly subscriptions. Silver is $16, Gold is $24, and Platinum is $32 if you pay monthly. That’s pricey! However, the yearly plans are $84, $114, and $144 for the same tiers, respectively, and the two-year plans are $120/$180/$240.
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