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

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These Tiny Robots Swim, Glow & Power Themselves. A Breakthrough You Need to See!

Imagine a tiny object swimming freely in water, glowing like a miniature light bulb, sensing its surroundings, and even transmitting signals—without any wires or batteries. This may sound like science fiction, but scientists have now taken a big step toward making it real. Researchers have introduced a new concept called electronic swimmers (e-swimmers)—miniaturized structures that can move in water while also performing electronic functions such as lighting, sensing, and signal processing.

This innovation opens the door to a new generation of smart micro-machines with applications in medicine, environmental monitoring, and advanced robotics.

What Are E-Swimmers?

E-swimmers are tiny engineered objects designed to move in liquids in a controlled direction while simultaneously performing electronic tasks. Unlike traditional small robots, these devices do not rely on onboard batteries or wires. Instead, they are powered wirelessly using electric fields applied to the surrounding liquid.

The key idea is simple yet powerful: combine motion and electronics into one tiny, self-sufficient system. These swimmers can emit light, detect changes in their environment, convert signals, and potentially deliver treatments—all while moving through water.

How Do They Move?

The motion of e-swimmers is based on a phenomenon called electric field-induced polarization.

When an electric field is applied to water containing a conducting object:

  • The object becomes polarized (one side positive, the other negative).

  • This creates different chemical reactions at each end.

  • Water molecules split into hydrogen and oxygen gases.

  • Tiny bubbles form on the surface.

These bubbles act like microscopic engines. As they grow and detach, they push the object forward—similar to how a rocket works, but at a very small scale.

This process is known as bubble propulsion, and it creates directional movement without any mechanical parts.

Powering Electronics Without Wires

One of the most exciting aspects of e-swimmers is that they can generate their own electrical current locally.

As chemical reactions occur on opposite sides of the swimmer:

  • Electrons flow through the object.

  • This creates a small but usable electric current.

  • That current can power electronic components like LEDs or sensors.

In experiments, scientists successfully powered tiny light-emitting diodes (LEDs) attached to these swimmers. This means the swimmer can literally glow while moving, making it easy to track and opening possibilities for communication and sensing.

Why Is This Different From Previous Technologies?

Earlier micromachines often relied on chemical fuels like hydrogen peroxide to move. While effective, such fuels are not suitable for biological environments because they can be harmful.

Other approaches include:

  • Magnetic field-driven motion

  • Light-powered propulsion

  • Electroosmotic flow systems

E-swimmers offer a major advantage:
they do not require harmful chemicals and can be controlled externally using electric fields.

Additionally, unlike some systems that only move in one direction, e-swimmers powered by direct current (DC) can reverse direction simply by changing the electric field. This makes them easier to control and more flexible.

Controlling the Motion

The movement of e-swimmers can be finely tuned by adjusting several factors:

  • Strength of the electric field

  • Composition of the liquid (electrolyte)

  • Shape and design of the swimmer

  • Weight of the object

  • Size of the bubbles (affected by surfactants)

By changing these parameters, scientists can control speed, direction, and behavior. In experiments, swimmers reached speeds of around 3 cm per second, which is quite fast at this scale.

Efficiency: A Challenge to Overcome

Despite their impressive abilities, e-swimmers are currently not very energy efficient.

There are two main efficiency concerns:

1. Electrical Efficiency

Only a small fraction of the total electric current actually passes through the swimmer. Most of it is lost in the surrounding liquid.

  • Efficiency ranges roughly between 0.2% and 4%

2. Propulsion Efficiency

The conversion of electrical energy into motion is extremely low.

  • Overall efficiency can be as low as 0.00002%

While these numbers may seem disappointing, they are actually similar to other bubble-driven micromotors. More importantly, the goal of this technology is not high efficiency, but functionality and control at small scales.

Real-World Applications

E-swimmers could revolutionize multiple fields:

1. Medicine

  • Targeted drug delivery inside the body

  • Minimally invasive diagnostics

  • Real-time sensing in fluids like blood

2. Environmental Monitoring

  • Detect pollutants in water

  • Monitor chemical changes in real time

  • Explore hard-to-reach aquatic environments

3. Micro-Robotics

  • Swarm robotics systems

  • Smart micro-sensors that move and communicate

  • Tiny devices capable of performing multiple tasks simultaneously

Challenges and Limitations

While promising, the technology still faces important challenges:

  • Scaling down: Making these devices extremely small is difficult because stronger electric fields are needed at smaller sizes.

  • Energy losses: Most energy is wasted in the surrounding liquid.

  • Complex control systems: Precise navigation in real environments remains challenging.

Because of these limitations, current designs are most practical at sub-millimeter scales, rather than true nanoscale.

The Future of E-Swimmers

The most exciting aspect of this research is the idea of wireless energy transfer to moving objects. Multiple swimmers can be controlled and powered simultaneously without direct contact.

Future developments may include:

  • 3D movement control (up, down, sideways)

  • More advanced onboard electronics

  • Integration with sensors and communication systems

  • Swarms of coordinated micro-robots

These advancements could lead to intelligent, mobile systems that operate autonomously in complex environments.

Conclusion

E-swimmers represent a major step forward in the world of miniaturized robotics. By combining motion, power generation, and electronic functionality into a single system, scientists have created a new class of devices that blur the line between machines and living systems.

Although challenges remain, the potential applications—from healthcare to environmental science—are vast. As research progresses, these tiny glowing swimmers could become powerful tools that operate invisibly in the smallest corners of our world, performing tasks that were once impossible.

The future of robotics may not be big and mechanical—but small, smart, and swimming silently through water.

Reference: Roche, J., Carrara, S., Sanchez, J. et al. Wireless powering of e -swimmers. Sci Rep 4, 6705 (2014). https://doi.org/10.1038/srep06705

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