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Gravity can stretch a liquid into a thread, and focused ultraviolet light can freeze that thread in place. A team led by Jan Siemen Smink at the University of Twente has combined the two in a laboratory setup: a falling jet of highly reactive, UV-curable resin is pulled thin by its own weight while a point along the jet is hardened by light. A model that accounts for gravity, inertia and capillarity predicted the final fiber radii the team measured. The result is a controlled laboratory study. Its manufacturing value is a possibility, not something the work has demonstrated.
How a falling liquid becomes a fiber
The apparatus is simple to describe, even if the physics is subtle. The process is continuous, so each step happens at the same time rather than in sequence.
- A photocurable liquid is pumped downward through a vertical nozzle. The liquid is a reactive resin that hardens when exposed to UV light.
- Gravity accelerates the stream. With the UV light off, the falling stream speeds up and eventually breaks apart into droplets, as an ordinary liquid jet does.
- Focused UV LEDs switch the stream from liquid to solid. The high-intensity LEDs sit about 5 mm below the nozzle. Where they strike the stream, polymerization happens quickly and the jet becomes a solid-like thread.
- The solid section pulls the liquid above it. The hardened portion hangs below the illuminated zone and keeps tugging on the still-liquid material above, so gravity continues to draw the filament thinner.
The solidified region is the key to the whole process. Because the thread is locked in place at the illumination point, the stretching stops being a race against droplet breakup and becomes a controlled drawing process.
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Light intensity sets where the fiber forms
Changing the UV intensity moves the point where liquid turns into solid. That gives the operator a dial over the location of the transition zone, and the location affects the final shape. According to the American Physical Society’s Physics Magazine overview, the outcomes range across three types:
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- A smooth, continuous fiber, when the jet solidifies in a way that keeps it intact.
- Connected beads, where solid sections are linked by thinner material.
- Separate droplets, where the stream still fragments before it can be fixed in place.
The team’s theory treats the transition zone with a momentum balance, combined with a chemical-kinetics model of how the resin hardens. The outcome is a parameter-free equation for the final fiber radius that depends on gravity, inertia and capillarity. The APS overview says the equation reliably predicted the radii measured in the experiment. That is a statement about this apparatus and this liquid, and it should not be read as a general rule for every polymer.
Where the work was published
The paper, “Fast Solidification of a Gravity-Stretched Liquid Jet,” is by J.S. Smink, C.W. Visser and H. Lhuissier. It appeared in Physical Review Letters, volume 137, article 144004, on October 2, 2026. The same day, APS published its Physics Magazine overview, “Spinning Liquid into Solid.” The University of Twente announced the work on October 8, 2026, noting that the paper was selected as both an Editors’ Suggestion and Featured in Physics.
Those selections signal that editors judged the paper to be of wide interest. They do not add independent evidence about the fiber results.
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What the experiments show, and what they do not
The evidence supports three conclusions. First, gravity can stretch a reactive liquid jet in a controlled way. Second, focused UV light can solidify that jet at a chosen point. Third, a model built from momentum balance and reaction kinetics matched the fiber radii measured in the same experiment.
The University of Twente describes a simple demonstration. Illuminated and unilluminated jets were collected on a plate, and only the illuminated jet kept its shape. That confirms that light solidified the material in the demonstration. The announcement does not report a standardized fiber-strength test, so the work says nothing about how strong or durable the fibers are for textile or industrial use.
Several claims are outside the evidence:
- No manufacturing cost reduction has been measured.
- No commercial deployment is described.
- No textile performance advantage has been shown.
- The model has not been shown to predict every polymer-spinning process.
The APS overview says the team hopes to examine how the simplified dynamics hold when solidification is more gradual or when air drag plays a bigger role. Those are the conditions under which the current model’s simplifications would be tested, and they remain open.
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What the researchers said
Henri Lhuissier, a fluid-mechanics expert at Aix-Marseille University, put the problem in context: “Most manufactured fibers are spun, but what happens is mostly unpredictable due to the complexity of chemistry, phase changes, fluid mechanics, and other factors.” The gravity-and-light approach is an attempt to make part of that process measurable.
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Detlef Lohse, a fluid-dynamics expert at the University of Twente, offered a broader assessment: “Using light to induce solidification in a liquid jet is a highly original idea that opens up great opportunity for controlling spinning and fiber production.” He also said, “This work nicely combines very careful experiments with a deep theoretical analysis.”
Numbers and what they measure
Neither the University of Twente announcement nor the APS overview gives a headline performance statistic that is suitable for quoting. The most concrete figure is the LED placement: the focused UV LEDs sit about 5 mm below the nozzle. That is an apparatus dimension. It describes where the experiment was run, not how much the process improves anything.
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Can this be reproduced with ordinary equipment?
The sources describe a specialized photocurable liquid and focused, high-intensity UV LED apparatus. They do not recommend a consumer resin, lamp, nozzle or kit, and they do not establish that the effect can be reproduced with generic craft or hobby supplies. Readers should treat the work as a laboratory demonstration, not a home project.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to compare it with other fiber-spinning methods
The cited coverage does not include a head-to-head comparison with commercial spinning, so the following list gives the questions a fair comparison should answer rather than verdicts:
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware match- How the fiber is stretched: gravity here, versus imposed drawing in other methods.
- How and where solidification is triggered: a focused light point here, versus the triggers used elsewhere.
- How the final radius and continuity are controlled: here, through light intensity and the model.
- How far the behavior has been validated: so far, within the reported laboratory setup.
Until a method has been tested under the same conditions, any claim that one approach is better than another should be treated as unproven.
What to watch next
The next useful evidence will come from work that tests the model beyond the current setup. The most important checks are whether the model holds when solidification is slower and when air drag becomes more important, and whether fibers made this way meet established strength and durability measures. Until those results exist, the work’s significance is that it links gravity, light and solidification in a way that can be predicted.
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Can I recreate this with household UV lamps and craft resin?
The sources describe a specialized photocurable liquid and focused, high-intensity UV LEDs placed about 5 mm below a nozzle. They do not recommend any consumer product and do not show that the effect works with generic supplies. Treat it as a laboratory result.
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