Skip to main content

Scientists Discover Way to Send Information into Black Holes Without Using Energy

3 comments

World’s First “Self-Destructing” Sensor That Turn Into Rust After Use Has Been Created

Magnetic field sensors are everywhere in modern life—even if we rarely notice them. They are inside smartphones, cars, hard drives, window alarms, industrial machines, and even packaging systems. Every year, billions of these tiny components are produced and used across the world, quietly powering detection of motion, position, speed, and distance.

But now, scientists are rethinking how these essential components are made—and what happens to them after use. A research team working at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) in Germany has developed a new generation of sustainable magnetic field sensors that could reduce environmental damage and electronic waste. Their work introduces a major shift in how electronic materials can be designed, used, and eventually safely broken down.

Published in Nature Communications, the study shows that high-performance sensors can be built using earth-friendly materials like iron, cellulose, and starch—without relying heavily on toxic metals such as nickel or cobalt.

⚙️ Why Magnetic Sensors Need a Sustainable Upgrade

Today’s magnetic sensors are extremely advanced and highly sensitive. However, they come with a hidden cost.

Many commercial sensors depend on materials like nickel and cobalt. These metals are effective for performance, but they raise serious concerns:

  • They can be harmful to the environment if not properly disposed of

  • Mining and refining them require large amounts of energy

  • Their supply chains are expensive and not always sustainable

According to researchers, this creates a growing problem. As electronic devices increase in number every year, so does electronic waste. And most of this waste is difficult to recycle safely.

Dr. Denys Makarov, head of the Intelligent Materials and Systems Department at HZDR, highlights this issue clearly: the challenge is not just performance, but sustainability. The world needs sensors that are not only efficient but also safe for the planet.

🧲 The Big Idea: Using Iron in a Smarter Way

Iron is one of the most common and widely available materials on Earth. It is also biocompatible, meaning it is generally safe for biological and environmental systems.

However, iron alone is not sensitive enough for modern high-performance magnetic sensors.

To solve this problem, the research team developed a clever solution: core-shell particles.

In this design:

  • The core is made of iron

  • The outer shell is made of iron oxide

This combination improves performance while maintaining environmental safety. The iron core provides strong magnetic response, while the iron oxide layer stabilizes and protects the particle.

Instead of relying on rare or toxic materials, the team engineered a structure that uses simple, abundant elements in a smarter configuration.

🖨️ A Printing Method Inspired by Textile Technology

One of the most interesting parts of this research is how the sensors are made.

Instead of using traditional complex semiconductor manufacturing, the team uses screen printing, a technique more commonly associated with printing on fabrics or T-shirts.

Here’s how it works:

  • A special ink containing iron–iron oxide particles is prepared

  • This ink is printed only where the sensor is needed

  • The pattern is formed directly onto surfaces

This approach has several advantages:

  • Less material waste

  • Lower energy consumption

  • Simpler and cheaper production

  • Flexibility in design and shape

As researcher Lin Guo explains, the goal is to print sensors only where they are needed, rather than manufacturing large electronic structures and cutting them down later. This makes the process far more efficient and sustainable.

📊 Performance Close to Commercial Sensors

One of the most important questions in this research is simple:
Can sustainable materials match modern performance standards?

The answer is promising.

According to the research team, these printed sensors achieve sensitivity levels that are comparable to some commercial magnetic sensors in specific applications.

This is a major achievement because it shows that sustainability does not necessarily mean sacrificing performance. Instead, smart material design can bridge the gap between environmental responsibility and technological efficiency.

⏳ Sensors That Can Disappear After Use

Perhaps the most revolutionary idea in this research is not just how the sensors are made—but what happens after they are used.

Traditional electronics are designed to last as long as possible. Once they stop working, they become electronic waste, which is often difficult to recycle.

In contrast, these new sensors are designed with a different philosophy: temporary electronics.

The researchers embedded the magnetic particles into natural, biodegradable materials such as:

  • Cellulose (plant-based fiber)

  • Starch

  • Beeswax or biocompatible polymers

These materials act as both structure and protection. They control how long the sensor remains functional.

This means:

  • The sensor works for a defined period

  • Then gradually breaks down safely

  • Leaving behind mostly harmless iron oxide (rust)

As Dr. Makarov explains, what remains at the end is essentially rust—non-toxic and environmentally safe.

🌱 Controlling the Lifespan of Electronics

One of the most innovative aspects of this technology is lifespan control.

By changing the outer protective coating, researchers can decide:

  • How long the sensor stays stable

  • How quickly it degrades after use

  • What environmental conditions affect it

This makes the technology highly flexible. For example:

  • A short-life sensor could dissolve in days

  • A longer-life version could last months

This ability opens new possibilities for designing electronics that match their exact purpose—no more, no less.

📦 Real-World Applications

This technology is not just theoretical. The research team has already licensed the printing method and is now exploring practical applications.

Some promising use cases include:

1. Smart Packaging

Sensors could monitor temperature, movement, or tampering in food and medicine packaging, then safely degrade after use.

2. Disposable Medical Devices

Temporary sensors could be used inside medical patches or diagnostic tools that do not require retrieval.

3. Agriculture

Sensors in soil or crop systems could track environmental conditions and then naturally break down.

4. Short-Term Industrial Monitoring

Machines and logistics systems could use temporary sensors for specific monitoring tasks.

In all these cases, the key advantage is clear: electronics that do their job and then safely disappear.

🔬 The Future of Sustainable Electronics

The research team is already working on the next steps. Future developments aim to:

  • Improve durability control of biodegradable coatings

  • Explore new eco-friendly materials

  • Integrate sensors into flexible electronic systems

  • Expand performance for wider industrial use

This direction could reshape how electronics are designed globally.

Instead of asking “How long can this device last?”, engineers may soon ask:
“How long should this device last before it safely disappears?”

🌏 Conclusion

The development of eco-friendly magnetic field sensors marks an important shift in electronics research. By combining simple materials like iron with biodegradable compounds, scientists have shown that sustainability and high performance can coexist.

This innovation could help reduce electronic waste, lower environmental damage, and open the door to a new generation of “temporary electronics” designed for specific tasks and limited lifetimes.

In a world rapidly filling with electronic devices, this approach offers a powerful new idea: technology that not only serves us—but also responsibly leaves when its job is done.

Reference: Guo, L., Xu, R., Das, P.T. et al. Eco-sustainable magnetoresistive sensors towards disposable magnetoelectronics. Nat Commun 17, 3034 (2026). https://doi.org/10.1038/s41467-026-71077-9

Comments

Post a Comment

Popular

Scientists Discover Way to Send Information into Black Holes Without Using Energy

For years, scientists believed that adding even one qubit (a unit of quantum information) to a black hole needed energy. This was based on the idea that a black hole’s entropy must increase with more information, which means it must gain energy. But a new study by Jonah Kudler-Flam and Geoff Penington changes that thinking. They found that quantum information can be teleported into a black hole without adding energy or increasing entropy . This works through a process called black hole decoherence , where “soft” radiation — very low-energy signals — carry information into the black hole. In their method, the qubit enters the black hole while a new pair of entangled particles (like Hawking radiation) is created. This keeps the total information balanced, so there's no violation of the laws of physics. The energy cost only shows up when information is erased from the outside — these are called zerobits . According to Landauer’s principle, erasing information always needs energy. But ...
3 comments
Read more

Black Holes That Never Dies

Black holes are powerful objects in space with gravity so strong that nothing can escape them. In the 1970s, Stephen Hawking showed that black holes can slowly lose energy by giving off tiny particles. This process is called Hawking radiation . Over time, the black hole gets smaller and hotter, and in the end, it disappears completely. But new research by Menezes and his team shows something different. Using a theory called Loop Quantum Gravity (LQG) , they studied black holes with quantum corrections. In their model, the black hole does not vanish completely. Instead, it stops shrinking when it reaches a very small size. This leftover is called a black hole remnant . They also studied something called grey-body factors , which affect how much energy escapes from a black hole. Their findings show that the black hole cools down and stops losing mass once it reaches a minimum mass . This new model removes the idea of a “singularity” at the center of the black hole and gives us a better ...
Post a Comment
Read more

How Planetary Movements Might Explain Sunspot Cycles and Solar Phenomena

Sunspots, dark patches on the Sun's surface, follow a cycle of increasing and decreasing activity every 11 years. For years, scientists have relied on the dynamo model to explain this cycle. According to this model, the Sun's magnetic field is generated by the movement of plasma and the Sun's rotation. However, this model does not fully explain why the sunspot cycle is sometimes unpredictable. Lauri Jetsu, a researcher, has proposed a new approach. Jetsu’s analysis, using a method called the Discrete Chi-square Method (DCM), suggests that planetary movements, especially those of Earth, Jupiter, and Mercury, play a key role in driving the sunspot cycle. His theory focuses on Flux Transfer Events (FTEs), where the magnetic fields of these planets interact with the Sun’s magnetic field. These interactions could create the sunspots and explain other solar phenomena like the Sun’s magnetic polarity reversing every 11 years. The Sun, our closest star, has been a subject of scient...
Post a Comment
Read more