Monday, April 20, 2026

 

A reusable chip for particulate matter sensing




Aerospace Information Research Institute, Chinese Academy of Sciences
Reusable SAW sensor for selective PM10 and PM2.5 detection. 

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eusable SAW sensor for selective PM10 and PM2.5 detection. Schematic overview of the reusable surface acoustic wave (SAW) particulate matter sensor system. The figure shows the porous membrane filter, sensor assembly, and sensing mechanism for particle-size-selective detection. A microperforated membrane is mounted above the SAW resonator to separate airborne particles by size, allowing simultaneous monitoring of particulate matter (PM) in the PM10 and PM2.5 ranges. The lower panel illustrates microheater-assisted particle detachment, which restores the sensor surface after dust exposure and enables repeated use. The frequency-shift curves on the right show the sensor response during particle capture and its recovery after heating.

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Credit: Microsystems & Nanoengineering






Air pollution is often monitored using instruments that are accurate but can be bulky, costly, or difficult to reuse continuously after particle accumulation. A new sensor system offers a compact alternative by combining surface acoustic wave (SAW) sensing with a porous membrane for particle-size separation and an integrated microheater for sensor recovery. In laboratory tests, the device simultaneously and selectively detected particulate matter in the PM10 and PM2.5 size ranges and then recovered toward its baseline after heating under vacuum. The study demonstrates a reusable sensing platform that may support future compact air-quality monitoring systems. 

Fine airborne particles are especially challenging to monitor because particle size affects both how long they remain suspended in air and how deeply they can penetrate into the respiratory system. PM2.5 is of particular concern because of its association with adverse health effects. Existing techniques, including beta-ray absorption, gravimetric methods, and light-scattering approaches, can provide useful measurements, but they may also involve tradeoffs such as system size, cost, humidity sensitivity, or reduced reliability under some conditions. Earlier SAW-based particulate sensors showed high sensitivity, but many relied on one-time particle attachment and did not provide a practical reusable format with clear size selectivity. Against this background, reusable and size-selective PM sensing remains an important research need.

Researchers from the Department of Electrical and Computer Engineering and the Department of Intelligence Semiconductor Engineering at Ajou University in Suwon, Republic of Korea, reported the study in Microsystems & Nanoengineeringpublished (DOI: 10.1038/s41378-025-01137-5) on 24 March 2026. Their system integrates two acoustic sensing channels, porous microstructured membranes, and an on-chip microheater to measure airborne particles and restore the sensor after particle buildup. The study presents the first SAW-based particulate matter sensor integrating a porous microstructure membrane for particle separation with an on-board microheater for particle detachment, enabling sensor reusability.

The design uses two porous filter membranes: one with pore diameters of approximately 11 μm for the PM10 channel and one with pore diameters of approximately 3 μm for the PM2.5 channel. These membranes were placed above two-port SAW resonator sensors operating at a center frequency of 222 MHz on 128° YX LiNbO₃ substrates. Simulations and experiments indicated that the 11 μm membrane allowed both larger and smaller particles to pass, while the 3 μm membrane preferentially passed smaller particles. In chamber tests, the PM2.5 sensor showed a sensitivity of 0.11 kHz/(μg/m³) to PM2.5 particles, while the PM10 channel showed 0.246 kHz/(μg/m³) to PM2.5 and, after subtraction-based calibration, 0.218 kHz/(μg/m³) to particles in the 2.5–10 μm range. When particles accumulated on the sensing surface, the integrated microheater was driven at 12 V, raising the device temperature to approximately 100 °C and enabling recovery under vacuum conditions. Over five days, the PM10 channel retained more than 90% of its relative response, while the PM2.5 channel remained above 80%.

The broader significance lies in integrating size-selective filtration and recovery into the chip itself. By combining particle separation and thermal recovery within a single SAW-based platform, the system may reduce reliance on conventional external separation components used in some particulate matter sensing setups. This approach could support the development of smaller, more reusable sensors for portable and continuous particulate matter monitoring. With further validation in real operating environments, such devices may be useful in a range of air-quality monitoring applications.

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References

DOI

10.1038/s41378-025-01137-5

Original Source URL

https://doi.org/10.1038/s41378-025-01137-5

Funding Information

This research was funded by the Ministry of Science and ICT (RS-2023-00278288, RS-2024-00457846, and RS2023-NR119846).

About Microsystems & Nanoengineering

Microsystems & Nanoengineering is an online-only, open access international journal devoted to publishing original research results and reviews on all aspects of Micro and Nano Electro Mechanical Systems from fundamental to applied research. The journal is published by Springer Nature in partnership with the Aerospace Information Research Institute, Chinese Academy of Sciences, supported by the State Key Laboratory of Transducer Technology.

 

Giant Magellan Telescope and Coquimbo Regional Government sign strategic partnership to strengthen Chile’s astronomy industry



New partnership advances regional economic growth through astronomy and positions Coquimbo region as Chile’s global hub for science, technology, and innovation




GMTO Corporation

Giant Magellan Telescope and Coquimbo Regional Government Sign Strategic Partnership 

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From left to right: Chilean Consul in Los Angeles, Mr. Francisco Leal; Governor of Coquimbo, Mr. Cristobal Juliá; Giant Magellan Telescope President, Daniel Jaffe; Giant Magellan Telescope Vice President and Representative in Chile, Oscar Contreras.

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Credit: Gonzalo Torres - GMTO Corporation





PASADENA, CA – April 17, 2026 – Today, the Giant Magellan Telescope and the Coquimbo Regional Government announced a strategic collaboration to advance Chile’s astronomy industry, drive regional economic growth, and position the Coquimbo region as a global hub for science, technology, and innovation. At the heart of this partnership is Chile’s first national visitor and education center for astronomy, designed in partnership with Exploratorium to bring the excitement of discovery, technological innovation, and astrotourism directly to the public.

“This partnership positions the Coquimbo Region at the forefront of an industry that is shaping the future of science, technology, and opportunity,” said Governor Cristóbal Juliá. “By working with the Giant Magellan Telescope, we are creating high-quality jobs, advancing innovation, and establishing our region as a leader in one of the most important industries in the world, all while connecting Chileans with the incredible discoveries happening from our skies.”

To support public engagement and communicate the progress of the partnership, the Giant Magellan Telescope and the Coquimbo Regional Government have launched a dedicated website at coquimbo.giantmagellan.org. The site will serve as a central platform to share updates, highlight regional impact, and showcase the significance of the collaboration.

The agreement was formalized during the Governor’s official visit to the Giant Magellan Telescope’s headquarters in Pasadena, where he met with the observatory’s international leadership, including President Daniel Jaffe, and with the attendance of the Chilean Consul in Los Angeles, Mr. Francisco Leal. The signing reflects a growing alignment between regional leadership and one of the most significant international scientific infrastructure projects underway today.

Chile is home to the majority of the world’s astronomical infrastructure and, by the 2030s, will host nearly 70 percent of it. The Coquimbo Region plays a central role in that leadership, hosting major observatories and operational centers, including the Vera C. Rubin Observatory, the world’s newest and most advanced survey telescope. The region’s growing infrastructure, observatory operators, and scientific workforce will also be celebrated through the proposed national visitor and education center, providing public access to Chile’s astronomy industry, technological innovations, and scientific discoveries.

“The Giant Magellan Telescope represents a multi-billion-dollar international investment in Chile, and this partnership ensures that its benefits extend well beyond the observatory site,” said Daniel Jaffe, President of the Giant Magellan Telescope. “Together, we are establishing a long-term foundation that supports scientific leadership, economic growth, expanded opportunity across the region, and a public-facing hub that will connect people directly with Chile’s world-class astronomy industry.”

Located at Las Campanas Observatory, the Giant Magellan Telescope is part of a new generation of “extremely large telescopes” that support a world-class scientific, engineering, and industrial ecosystem. Over nearly a century of operations, the observatory will anchor sustained demand for expertise in engineering, construction, data systems, and scientific research.

As part of this partnership, the Giant Magellan Telescope will establish its primary operations base in the Coquimbo Region, creating a central hub for telescope operations, data systems, and scientific activity. Within this campus is a flagship visitor and education center, a first-of-its-kind national landmark in Chile, developed in collaboration with the Exploratorium, a global leader in interactive science education. Envisioned as a world-class destination, the center will showcase technological innovation, and scientific discoveries, support workforce development, and promote astronomy tourism, making Chile’s leadership in the industry visible and inspiring to all.

“Together we’re creating a place where people can gather and directly experience the power of science and engineering,” said Anne Richardson, Chief Experience Officer at the Exploratorium. “Drawing on decades of experience creating spaces that spark curiosity and learning, we’re proud to partner on this effort. This center will connect communities to Chile´s astronomy research, inspire future generations and make discovery tangible and accessible to all.”

For regional commerce, the partnership will also establish the Port of Coquimbo as the main logistics hub for the project, supporting the transport of major telescope components and infrastructure from international partners as the observatory is constructed over the next few years. This coordinated approach strengthens regional supply chains and positions the Coquimbo region as a critical entry point for global scientific infrastructure.

“This is about connecting the development of the telescope with regional growth,” said Oscar Contreras, Vice President and Chile Representative for the Giant Magellan Telescope. “Through this partnership, we are strengthening local capabilities, expanding opportunities for Chilean talent, and ensuring that the benefits of this global scientific investment are realized within the communities closest to it.”

A central pillar of the partnership is the protection of Chile’s astronomical observing conditions as a strategic national resource, one that is becoming increasingly rare worldwide. Ensuring long-term astronomical site protection is essential for maintaining Chile’s leadership in a global industry that depends on stable, high-quality skies.

This strategic partnership establishes the Coquimbo Region as a global hub for astronomy, linking the operations center, the first-of-its-kind national landmark visitor center, and the protection of Chile’s world-class observing sites, while engaging the public in Chile’s astronomy industry. Together, these efforts will expand Chile’s leadership in the astronomy for generations to come.

Sunday, April 19, 2026

 

Family-led firearm strategy goes 'beyond the screen' to curb suicide risk




University of Michigan







Images                                                                

A family-centered approach to firearm safety can change how guns are kept in homes and may offer a new path to reducing suicide risk.

A new University of Michigan study, published in Injury Prevention, tested a method called the Family Safety Net in Alaska, which shifts suicide prevention away from individual screening and toward household action. This change, researchers say, could help reach people who are often missed by standard tools. 

"Currently, suicide is a leading cause of death, particularly for young people, and is not getting better with the same old approaches. said Lisa Wexler, research professor at the U-M Institute for Social Research and professor of social work. "Our typical suicide screening tools rely on individual self-report and miss people who are suicidal for a number of reasons, such as suicide behavior can be impulsive, not sure they want help, fear of losing personal agency in service of safety, etc." 

The approach suggests that caregivers take three actions. First, they answer brief screening questions about whether someone in the home may be at risk of suicide. Second, they participate in a brief motivational interviewing session, and receive free firearm safety and mental health awareness resources. Lastly, participants receive positive text messages for a month afterward that emphasize the person's good intentions in fun, culturally based ways. 

Wexler and colleagues developed this program with Alaska Native partners. They enrolled 62 adults who had firearms in the home and a young person under 29 in the household.

The average number of guns per household was 3.12.

The results showed high levels of feasibility and community support:

  • 93% of participants completed the follow-up study

  • 33% of participants identified concern for a household member and received the full Family Safety Net intervention

  • Safe storage scores increased across all participant groups

  • 15.5% of participants moved firearms to a different household to increase safety

"The vast majority of people who participated in the Family Safety Net gave us a 10 out of 10 in their experience," Wexler said. "The intervention really builds on family members' love for each other and helps to keep them safe. In this way, the intervention is universal and reduces suicide risk by helping people do what they want to do."

The study found that both delivery methods, such as a 30‑minute motivational interview or a 15‑minute scripted session, were practical in rural clinics. The scripted version requires less training and may be easier to scale.

Participants said the program also helped them talk with family members about safety and reduced their concerns. One participant said learning the "10‑minute rule," delaying access to a gun by even a few minutes, was a key lesson. 

"We know that if you can interrupt a suicidal impulse, make it 10 minutes harder to act on that impulse, you can save a life," Wexler said. "Half of the suicide deaths in the U.S. are by firearms, which cause more suicide deaths than any other kind of death." 

Findings point to a new direction for suicide prevention in high gun‑ownership regions and firearm injury prevention is essential to prevent suicide. The program also builds on family concern, household action and avoids stigma by focusing on safety rather than diagnosis. 

"Most people who die by suicide see a primary care provider in the year before their death, making this approach a potential fit for clinical settings," Wexler said. "Offering resources and support, without control, to help other people and teens in their lives is a promising, less professionalized and novel way to prevent suicide." 

Study: Are you worried someone in your household is at risk of suicide? Piloting ways to acceptably and feasibly increase safe firearm storage in rural Alaska (DOI: 10.1136/ip-2025-045917)

 

3D-printed brain sensors may unlock personalized neural monitoring




Penn State

3D Printed Bioelectrode 

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The soft bioelectrodes use a honeycomb-inspired design that allows researchers to stretch them onto the specific geometry of a patient’s brain, without sacrificing structural strength or sensitivity to electrical and physiological signals.

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Credit: Provided by Tao Zhou





UNIVERSITY PARK, Pa. — Soft electrodes designed to perfectly match a person’s brain surface may help advance neural interfaces for neurodegenerative disease monitoring and treatment, according to a new study led by Penn State researchers. Neural interfaces are powered by tiny sensors capable of tracking biophysical signals, known as bioelectrodes. These sensors are usually made from stiff materials in a one-size-fits-all design that struggles to match the brain’s complex structure. The researchers have created a novel approach to 3D printing bioelectrodes that can stretch and morph to fit the minor differences that make every brain unique.

The team used software to simulate detailed brains based on MRI scans taken from 21 human patients, shaping a set of electrodes tailored for brains’ specific structures before 3D printing the electrodes and models of the brains. In a paper published in Advanced Materials, they reported that their electrodes better fit the structure of the brain than traditional designs, while remaining effective and biologically compatible, even in tests done in rats.

The folds in the human brain are created through a process known as gyrification, where the cortical sheet on the outer wall of the brain bunches up into ridges, known as gyri, and grooves, known as sulci. This helps cells across the brain communicate at high speeds, and allows for a relatively large organ to fit compactly in the skull — a spread-out adult brain would be around 2,000 square centimeters, or about the size of two large pizzas.

Although the major cortical folds are consistent across individuals, the precise layout of the brain’s gryi and sulci changes substantially from person to person, according to Tao Zhou, Wormley Family Early Career Professor, assistant professor of engineering science and mechanics and corresponding author on the paper. However, traditional bioelectrode designs don’t take this into account.

“Each person has a different brain structure, depending on their height, weight, age, sex and more,” said Zhou, who also holds an affiliation in biomedical engineering and the center for neural engineering at Penn State. “Despite this, we try to fit neural interfaces onto brains like they have identical structures. This motivated us to create electrodes that are tailored for each individual, based on the structure of their brain.”

The electrodes are built mainly from a water-rich material known as hydrogel to better match with the soft tissues and patient-specific geometry of a brain. Furthermore, the team used a novel honeycomb-inspired structure that offers flexibility and strength, while remaining cost-effective and quick to print, according to Zhou.

“The honeycomb structure helps us significantly reduce the stiffness of the electrodes, without sacrificing their mechanical strength,” Zhou said. “What’s more, the structure helps us reduce the overall material used during fabrication, reducing production time, cost and environmental impact.”

Production starts by taking an MRI scan of a patient's brain, which is used to conduct finite element analysis — a process that creates a detailed simulation of a person’s neural structure. This analysis is then rendered as a 3D model of the patient's brain, where the team uses computer software to tailor a bioelectrode specifically morphed to fit the ridges and grooves of the cerebral cortex.

After shaping, the team 3D prints the hydrogel electrode using direct ink printing, a technique that can create electrodes capable of monitoring and transmitting brain signals over a relatively small surface. For this study, the team 3D printed models of 21 different participant brains, applying their electrodes and physically measuring how accurately the electrodes could fit the brain surface. Zhou explained how traditional fabrication approaches require specialized facilities like clean rooms, making them incredibly expensive to customize — 3D printing allows the team to personalize and manufacture electrodes much faster, for a fraction of the price.

Compared to traditional approaches, the hydrogel-based electrodes follow the structure of the brain more precisely. Zhou said their approach produces electrodes that exhibit nearly perfect connectivity to electrical signals present in the brain. Additionally, because the stretchy gel is so malleable, it can be applied to the soft brain tissue without causing damage, compared to the stiff materials comprising other designs that could damage tissue.

According to Zhou, the softness of their electrodes enables closer and more stable contact with the brain, in turn facilitating higher-quality, more reliable monitoring. Moreover, bioelectrodes made with this approach don’t impact fluid transport around the brain, a critical aspect of brain function that many traditional electrodes disrupt.

“Personalizing the electrodes to the brain’s specific structure substantially improves their reliability,” Zhou said. “Because they conform to the brain better, the signal quality itself is significantly improved.”

To further study their electrodes, the team placed them onto the brains of rat models over a period of 28 days. The rats did not exhibit any immune response to the printed electrodes, a key consideration in biodevice development, Zhou said. Additionally, the electrodes did not exhibit performance degradation, while offering sensitive and accurate readings of the electric and physiological signals in the brain.

Zhou said he believes that this printing method could serve as a framework for the commercial-scale printing of bioelectrodes customized for specific patients. Although these systems are traditionally used for monitoring neural activity, the team plans to explore how personalized electrodes may contribute to neurological treatments.

“We are looking to further improve this technology to optimize the electrodes to monitor for specific diseases,” Zhou said. “In the future, we would really like to work with patients to see how this approach could support brain monitoring and disease treatment in clinical settings.”

Additional co-authors affiliated with Penn State include Nanyin Zhang, professor of biomedical engineering and Dorothy Foehr Huck and J. Lloyd Huck Chair in Brain Imaging; Sulin Zhang, professor of engineering science and mechanics and of biomedical engineering; engineering science and mechanics doctoral candidates Marzia Momin, Luyi Feng, Salahuddin Ahmed and Jiashu Ren; biomedical engineering doctoral candidates Xiaoai Chen, Hyunjin Lee and post-doctoral scholar Samuel R. Cramer; mechanical engineering doctoral candidate Xinyi Wang; Basma AlMahood, an undergraduate student studying physics at the time of research who is now a physics doctoral candidate at Michigan State University; and Li-Pang Huang, a research assistant.

This work was supported by the U.S. National Science Foundation and the National Institutes of Health.

At Penn State, researchers are solving real problems that impact the health, safety and quality of life of people across the commonwealth, the nation and around the world.    

For decades, federal support for research has fueled innovation that makes our country safer, our industries more competitive and our economy stronger. Recent federal funding cuts threaten this progress.  

Learn more about the implications of federal funding cuts to our future at Research or Regress.

  

Using 3D-printed models of several patients' brains, the team tested how well their electrodes could stretch to fit the individual cortical geometry – their electrodes can snugly fit atop the geometry of a patient’s brain with more precision than systems created with traditional methods.

Credit

Provided by Tao Zhou

 

Researchers combine carbon dioxide capture and conversion into one system


The new approach, developed by the University of Chicago Pritzker School of Molecular Engineering and Argonne National Laboratory researchers, offers a streamlined and cost-effective pathway toward decarbonization




University of Chicago

Reginaldo Gomes 

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University of Chicago Pritzker School of Molecular Engineering researcher Reginaldo Gomes, PhD'25, is the first author on a new study from the lab of Asst. Prof. Chibueze Amanchukwu that modeled a system that can simultaneously capture and convert CO₂. (Photo by John Zich)

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Credit: UChicago Pritzker School of Molecular Engineering / John Zich





Every year, power plants and factories release billions of tons of carbon dioxide (CO₂) into the atmosphere. Methods exist to capture that CO₂ using chemical solutions and, separately, to convert pure CO₂ into useful fuels and chemicals. But doing both steps at once, in a cost-efficient and scalable way, has been difficult.

Now, researchers at the University of Chicago Pritzker School of Molecular Engineering (UChicago PME) and the U.S. Department of Energy’s Argonne National Laboratory have developed a system that can simultaneously capture and convert CO₂. The approach, they reported in Nature Energy, offers a more efficient and potentially lower-cost approach than carrying out each step separately.  

By swapping the water usually used in carbon capture and conversion systems for a different solvent, the team was able to capture CO₂ more efficiently and convert it into carbon monoxide, an industrially relevant building block for the chemical industry used to make a wide range of fuels and chemicals today. They also turned to zinc, rather than the usual silver, to catalyze the conversion reaction, bringing costs for the process down further. 

“The concept of being able to integrate capture and conversion into a single step is a relatively new one, and we’ve made significant headway in not only showing that this is possible but that it can be done under conditions that are relevant for industrial deployment,” said Chibueze Amanchukwu, Neubauer Family Assistant Professor of Molecular Engineering at UChicago PME and senior author of the new study.

One process instead of two

In conventional carbon capture, amines — nitrogen-based compounds that bind readily to CO₂ — are dissolved in water. Releasing the captured CO₂ for later use requires heating the solution to temperatures as high as 150°C and compressing the CO₂. Meanwhile, if that captured CO2 was converted in water, water carries out unwanted side reactions, ultimately leading to hydrogen gas. 

Amanchukwu, whose lab focuses on electrochemistry in non-aqueous solvents, was brought together with scientists at Argonne National Laboratory through the University of Chicago Joint Task Force Initiative, a program designed to foster collaboration between the two institutions. About four years ago, the group formed a team and asked themselves what big problem was worth tackling together. They landed on reactive capture — the idea that CO₂ could be converted directly into a useful product while still bound to the amine. 

“The challenge with current capture methods comes when you need to recover that CO₂. You need to boil the solution, which requires significant energy,” said first author of the study Reginaldo Gomes, who completed his PhD at UChicago PME and is now a postdoctoral researcher at Argonne. “We asked whether, instead of going though those costly steps, we could use electricity to convert the captured CO₂ directly into something valuable."

Changing the solvent changes the chemistry

Many of the challenges around combining current capture and conversion methods revolve around water’s unwanted chemical reactions. So the team began by replacing water with DMSO — a widely used industrial solvent.

In water, two amines must come together to bind each captured CO₂ molecule. Amanchukwu, Gomes, and their colleagues showed that in DMSO, the same amines form a different arrangement and can capture one CO₂ for every amine, doubling the system’s capture capacity. At the same time, no CO₂ is lost to the competing chemical pathways that occur in water. Overall, the team observed nearly three times higher CO₂ uptake per amine molecule in DMSO compared to water.

With fewer hydrogen-forming side reactions, the group realized they could also make another change to the system. Silver catalysts, used in water-based capture approaches because they are resistant to making hydrogen, could be swapped for zinc — an earth-abundant metal far less expensive than the silver. 

“We didn’t anticipate how removing water would open up all these other new ways to make capture and conversion more efficient,” said Amanchukwu. “It worked better than we had even hoped for.”

Under lab conditions with pure CO₂, the zinc catalyst achieved 78% efficiency in converting captured CO₂ to carbon monoxide, a key industrial feedstock. Computational work by collaborator Cong Liu at Argonne revealed exactly why the zinc outperformed the silver in the DMSO system, requiring less energy.

Performing under real-world conditions

A critical test for any carbon capture technology is whether it works under actual industrial exhaust conditions rather than only with pure CO₂ in the lab. The team tested their system using simulated flue gas mixtures containing oxygen, which typically interferes with chemical reactions and can lower the efficiency of carbon capture and conversion. 

The new approach still achieved up to 43% efficiency in converting CO₂ to carbon monoxide over multiple capture-and-conversion cycles. That figure matches what state-of-the-art water-based systems achieve using silver under pure CO₂, a far less challenging condition.

Collaborators at Argonne, led by Dr. Chukwunwike Iloeje, carried out a techno-economic analysis to estimate the cost of using DMSO instead of water. They found that the improved performance of the system, particularly higher CO₂ conversion, can substantially offset the higher solvent cost. Replacing silver with zinc in the DMSO system could further reduce costs by using a more active and abundant catalyst.

The researchers are candid that significant work remains before the system can be scaled up. It must be able to run for thousands of hours rather than days, and reaction rates must increase roughly tenfold to reach commercial viability. New reactor designs better suited to industrial scale will also be required. Still, a patent disclosure has been filed, and the team has already been contacted by industry.

“We established the scientific foundation for this system,” said Gomes. “We’re not just working with a pure, controlled CO₂ stream in the lab — we developed something that can start to handle the complexity of real-world challenges.”

Citation: “Reactive CO₂ Capture via Controlled Amine Speciation in Nonaqueous Electrolytes,” Gomes et al, Nature Energy, April 17, 2026. DOI: 10.1038/s41560-026-02035-4

Funding: This work was primarily funded by the University of Chicago Joint Task Force Initiative and the U.S. Department of Energy (DE-SC0024103, DE-AC02-06CH11357). Additional support was provided by the CIFAR Azrieli Global Scholars Program and the Research Corporation for Science Advancement Negative Emissions Science program.