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Sound-absorbing silk


In a world where noise is becoming increasingly intrusive, the emergence of innovative materials that can reduce its impact is of great interest. MIT researchers have unveiled a new sound-absorbing silk fabric that promises to revolutionize quiet spaces.

The Massachusetts Institute of Technology (MIT) has made significant breakthroughs in the field of sound absorption. Researchers have developed a special silk fabric that can effectively absorb sound and create cozy, quiet environments.

The fabric, thinner than a human hair, contains a unique vibrating fiber that is activated when voltage is applied to it. This feature allows the fabric to be used to suppress sound waves in two different ways.

The first method uses fabric vibrations to generate sound waves that cover and cancel out unwanted noise, similar to noise-canceling headphones. This approach is effective in confined spaces such as airplane cockpits or indoor spaces.

The second method is more surprising: the fabric is fixed to suppress vibrations, which play a key role in sound transmission. This helps reduce noise in large spaces such as offices or cars.

Using common materials such as silk and muslin, the researchers created noise-absorbing fabrics that can be used in real-world environments. This material can be used to create partitions in offices, quiet areas in public areas or even in the automotive industry to reduce interior noise.

The development of sound-absorbing silk fabric at MIT is breaking new ground in acoustic technology. This material not only provides noise reduction, but also offers a wide range of applications in various areas of life, from office spaces to the automotive industry.

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A team of scientists working with a professor of inorganic and organometallic chemistry at the Technical University of Munich (TUM) has developed a new, powerful and stable graphene hybrid material for supercapacitors. It serves as the positive electrode in the energy storage device. The researchers combine it with a proven negative electrode based on titanium and carbon.

The new energy storage device not only provides an energy density of up to 73 kWh per kg, which is roughly equivalent to the energy density of a NiMH battery. At the same time, the new device performs much better than most other supercapacitors, at a power density of 16 kWh per kg. The secret of the new supercapacitor lies in the combination of different materials, which is why chemists call the supercapacitor "asymmetrical".

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A stable connection between nanostructured components has huge advantages in terms of long-term stability: the more stable the connections, the more charge and discharge cycles possible without significant degradation in performance.

A classic lithium battery has a lifespan of about 5000 cycles. The new cell, developed by TUM researchers, retains nearly 90% capacity even after 10 cycles.

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