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Three-layer microfluidic cooling device can remove heat from small electronics more efficiently

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Three-layer microfluidic cooling device can remove heat from small electronics more efficiently


Three-dimensional illustration of the overall microfluidic structure. The flow pathway is highlighted with the blue and red colors denoting low and high fluid temperatures, respectively. Credit: Wu et al. (Nature Electronics, 2025).

As electronic devices become increasingly powerful and compact, they can generate denser heat fluxes, or in other words, produce more heat in a smaller area. These heat fluxes raise the temperature of a device and can damage its underlying components, causing them to malfunction and, in time, even contributing to their failure.

To prevent this from happening, rely on thermal management systems and strategies. A promising strategy to dissipate heat in smaller electronics is known as microfluidic cooling. This technique prompts the flow of fluids through microscopic channels that are built into or in the proximity of integrated circuits, to remove heat and reduce the temperature inside a device.

Researchers at Peking University, the National Key Laboratory of Advanced Micro and Nano Manufacture Technology recently introduced a new microfluidic cooling approach that could remove heat from devices more effectively and efficiently than many previously introduced strategies. This approach, outlined in a paper published in Nature Electronics, relies on a newly developed three-layer microfluidic cooling device etched into a silicon substrate.

“The miniaturization of advanced electronics can lead to high heat fluxes, which must be dissipated before they cause device degradation or failure,” Zhihu Wu, Wei Xiao and their colleagues wrote in their paper. “Embedded microfluidic cooling is of potential value in such systems, but devices are typically limited to heat fluxes below 2,000 W cm−2. We report a microfluidic cooling strategy that can dissipate heat fluxes up to 3,000 W cm−2 at a pumping power of only 0.9 W cm−2 using single-phase water as the coolant.”

The cooling device developed by Wu, Xiao and their colleagues has a three-layer structure. The first layer is comprised of a tapered manifold, which distributes water across the surface of a chip and ensures that each microchannel receives an equal amount of coolant so that a device is uniformly cooled.

The middle layer, known as the microjet layer, consists of tiny nozzles that form microjets (i.e., high-speed streams of fluid that shoot directly onto a chip’s surface), improving the transfer of heat in devices by targeting the thermal boundary (i.e., the region where heat builds up). The third and final layer is comprised of microchannels, tiny grooves etched into silicon that carry the warm coolant out of an integrated chip.

“Our approach is based on a three-tier structure that consists of a tapered manifold layer on the top, a microjet layer in the middle and a microchannel layer with sawtooth-shaped sidewalls at the bottom,” Wu, Xiao and their colleagues wrote. “The structures are etched directly into the backside of the silicon substrate using standard microelectromechanical system technology. Moreover, the coefficient of performance can reach 13,000 and dissipate a heat of 1,000 W cm−2 at a maximum chip temperature rise of 65 K.”

In initial tests, the new microfluidic cooling approach proposed by these researchers was found to remove significantly more effectively than most previously introduced strategies. In addition, the team’s three-layered device requires little pumping power (0.9 W/cm²) to cool chips and could be fabricated on a large-scale using existing manufacturing processes.

In the future, the recent work by Wu, Xiao and his colleagues could support the development of smaller electronic devices that are also durable, highly performing and energy efficient. Moreover, their proposed cooling device could soon be improved and evaluated further in tests with a wider range of small electronics.

Written for you by our author Ingrid Fadelli, edited by Gaby Clark, and fact-checked and reviewed by Robert Egan—this article is the result of careful human work. We rely on readers like you to keep independent science journalism alive.
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More information:
Zhihu Wu et al, Jet-enhanced manifold microchannels for cooling electronics up to a heat flux of 3,000 W cm−2, Nature Electronics (2025). DOI: 10.1038/s41928-025-01449-4.

© 2025 Science X Network

Citation:
Three-layer microfluidic cooling device can remove heat from small electronics more efficiently (2025, October 26)
retrieved 26 October 2025
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I Wrote This While Trotting On a Dozen Different Walking Pads

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I Wrote This While Trotting On a Dozen Different Walking Pads


Most Versatile

Photograph: Kristin Canning

Lifesmart

TM2202 3-in-1 Treadmill

If you’re not keen on buying a standing desk, check out the Lifesmart 3-in-1 Treadmill. You can wheel the lightweight machine into any room, place the desk attachment across the handrail, and get to working and walking. The desk’s height won’t accommodate everyone—it was lower than I’d like, and I’m 5’4”. But for quick, basic work like answering emails or sitting in on a meeting, it got the job done just fine.

The 3-in-1 Treadmill gets its name from its ability to serve as a walking pad (with the rail down, the speed tops out at 3.7 mph), a treadmill (with the rail up, you can run up to 7.5 mph), and a workstation (with the rail up and desk attachment on).

It’s easy to set up, and transitioning between the walking pad, treadmill, and work modes is quick and simple (you just need to use a small tool to adjust the rail, which is magnetized so it can live on the rail and never get lost in a junk drawer). You can adjust the speed with buttons on the rails or with a Bluetooth remote, and a screen on the front of the machine cycles through your workout metrics. The sleek, modern design means you won’t be embarrassed to have it out in your living space. The only drawback is that it doesn’t have any incline options.

Quietest Pad

  • Photograph: Kristin Canning

  • Photograph: Kristin Canning

Flexispot

Auto Incline Walking Treadmill

This walking pad had the most intuitive setup of any on this list (likely thanks to its lack of a companion app, which oftentimes isn’t really necessary). I was able to set it up in minutes, and the remote connected right away, no Bluetooth pairing required. Like many walking pads, this one has a screen at the front that shows you your workout metrics. If you pause the machine to step off, you can pick right back up where you started, building on those metrics until you turn the machine off. One downside: It doesn’t track steps.

The Auto Incline Walking Treadmill offers a great incline range, going up to a level nine, or 12-percent incline. It’s one of the highest incline capabilities I’ve found in my testing. You can walk up to 4 mph on this machine, and you can connect your phone to play music through the speakers. The remote allows you to take on 30-minute, preprogrammed walking workouts, too, where the machine auto-adjusts the speed throughout (though not the incline). Otherwise, you can use it in manual mode and adjust the settings to your liking.



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It’s Not About the Bike: The Jackets and Lights to Keep You Cycling All Year Round

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It’s Not About the Bike: The Jackets and Lights to Keep You Cycling All Year Round


FAQs

We asked Joshua Hale, general manager of commuter bike specialists Quella, to answer all our questions on how to get your bike ready for winter and keep it running smoothly all year long.

How can cyclists stay visible to drivers without turning into a rolling Christmas tree?

It is not just the quantity of lights that’s important. Placement also makes a huge difference. A bright front and rear light are essential—ideally one steady and one flashing—to help you stand out without dazzling anyone on the road. Reflective details on moving parts like your jacket, ankles, or pedals also catch drivers’ eyes naturally. Good quality lights and reflective accents do a lot more than overloading on LEDs.

What’s the smartest way to layer clothing for warmth without overheating?

Layer clothing with breathability in mind. Start with a moisture-wicking base layer to keep sweat off your skin, add an insulating layer like a fleece or thermal jersey, and finish with a windproof or waterproof shell. You’ll warm up fast once you’re moving, so it’s better to start slightly cool. Zips and vents that can be opened on uphill climbs and closed on descents will come in handy. Other lightweight accessories such as gloves, a buff, and overshoes can also increase your comfort without adding bulk.

How can you adjust your tire size or pressure to ride safely on wet or icy roads?

In winter, opt for wider tires with a grippier tread—28 mm or more, if your bike allows it. The extra width increases contact with the road, giving better stability and traction. Lowering your pressure slightly (by around 10–15 psi) also improves grip on slippery surfaces without feeling sluggish. Avoid slick tires when it’s icy, and check your tires regularly, as wet roads pick up more glass and grit.

What are the easiest and most effective upgrades for commuters?

Mudguards are top of the list. They keep both you and your bike cleaner and drier. Good-quality lights with USB charging make daily use simpler, and winter-specific gloves can save your fingers on frosty mornings. Wider handlebars and padded bar tape also add comfort when the roads get rough. It’s all about small upgrades that make you want to keep riding, even when it’s cold and dark.

Why does your bike need more maintenance in the winter, and what quick maintenance tips can you suggest?

Winter is tough on bikes, with grit, salt, and moisture working their way into every moving part. Regular cleaning is the single best thing you can do, even if it’s just a quick rinse and wipe-down after wet rides. Keep your chain clean and lightly oiled, check brake pads more often, and make sure cables or hydraulic lines aren’t sticking. A few minutes of care each week prevents costly repairs later, and your bike will feel smoother and quieter every ride.



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PlayStation Portal’s Latest Update Proves Sony Needs a Real Handheld Console Again

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PlayStation Portal’s Latest Update Proves Sony Needs a Real Handheld Console Again


Another year, another update to Sony’s PlayStation Portal. The latest tweak to the hardware considerably expands the roster of games playable on the device—but the end result only highlights how urgently PlayStation needs to re-enter the gaming handheld market for real.

The evolution of PlayStation Portal has been fascinating to watch, mainly to see Sony practically scrambling to keep up with the gadget’s unexpected popularity. Launched November 2023, Portal was intended as a mere accessory for PlayStation 5. It had no native processing abilities, simply using Sony’s Remote Play technology to stream whatever happened on players’ personal PS5 to the portable’s screen.

Although it could technically be used anywhere with a strong Wi-Fi signal, difficulties connecting to public networks and high speed requirements to even launch a stream meant the Portal was effectively only suitable for in-home use, to free up the main TV or play in another room.

Somehow, it still took off, with Sony Interactive Entertainment CEO Hideaki Nishino saying in 2024 that the Portal had been a “huge success.” The same year, Sony made it easier to connect to public Wi-Fi and added actual cloud gaming support to Portal, with a selection of games on offer to players subscribing to PlayStation Plus Premium. The initial offering included “over 120 PS5 games from the PS Plus Game Catalog,” though the curated library was subject to change. It could have been a big shift in how players approached hardware and software alike, but, in practice, didn’t really deliver.

Even so, another year on and the Portal’s success seems unstoppable. Sony’s Takuro Fushimi recently told TechRadar that “the community’s response has been overwhelming” and that Portal is now the “most widely used device for PS5 Remote Play.” It’s little surprise, then, that Sony keeps trying to hammer it into something that looks, if you squint, like the standalone gaming handheld it was never intended to be, but that players so desperately want.

Clearer Skies?

Enter the newest update to PlayStation Portal. It takes Cloud Streaming out of its beta phase, expanding the streamable library from only those titles included in the PS Plus selection to many games digitally owned by players. Until now, if you didn’t have a game installed locally on your PS5 or it wasn’t included in that cloud catalog, too bad, no Portal play for you. Going forwards, you’ll be able to cloud stream many titles if they’re tied to your PlayStation account through purchase on the PlayStation Store—although you will still need to be subscribed at the PS Plus Premium tier to use the feature, which will set you back $160 for a full year.

The assortment available is already vast—more than 3,000 games at time of writing. On the face of it, this should be a transformative development for not just the Portal, but PlayStation as a gaming ecosystem. It potentially extends availability of titles you own to wherever you want to play them, and could even help alleviate data storage woes. Although the PS5’s internal drives can be expanded, SSDs can be pricey at higher capacities, and players with large digital collections often can’t install everything they own. Being able to stream games tied to your account without eating up drive space could be a great workaround.

The update also aims to improve the broader player experience on Portal. It finally adds the ability to make in-game purchases when cloud streaming (potentially useful if you want to buy some DLC or virtual currency), and allows players to receive game invites to multiplayer sessions when playing a game via the cloud. Previously, these features were only enabled for Remote Play gaming on Portal, since they were effectively being done through the PS5 and mirrored on the Portal’s screen. Accessibility features have also been improved, adding a screen reader tool and adjustable text sizes.



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