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Latest news of science and technology, new electronics:

The speech of sperm whales is similar to that of humans 18.05.2024

In the world of the ocean, where the mysterious and unknown coexists with the studied, sperm whales, with their huge brains, are of particular interest to science. Researchers, working with a huge array of audio recordings collected during the Dominica Sperm Whale Project (DSWP) - more than 8000 recordings, seek to unravel the secrets of their communication and understand the structure and complexity of the language of these mysterious creatures. By studying in detail the recordings of 60 sperm whales in the eastern Caribbean, scientists have revealed surprising features of their communication, revealing the complexity of their language. "Our observations indicate that these whales have a highly developed combinatorial communication system, including rubato and ornaments, which indicates their ability to quickly adapt and vary during communication. Despite significant differences in evolution, sperm whales have elements in their communication that are characteristic of human communication," says Shane Gero, a biologist at Carleton University and director of the CETI project. Issl ... >>

Electron spin for quantum information transfer 18.05.2024

The transfer of quantum information remains one of the key tasks of modern science. Recent advances in the use of electron spin to expand the capabilities of information transfer in quantum systems have become very important. Researchers at Lawrence Berkeley National Laboratory are pushing the frontiers of quantum information science by experimenting with the possibilities of electron spin. Electron spin, a natural quantum bit, is a potentially powerful means for storing and transmitting information in quantum systems. Magnon wave packets, collective excitations of electron spin, have revealed their potential to transmit quantum information over significant distances. The work of Berkeley Lab researchers has revolutionized the way such excitations propagate in antiferromagnets, opening up new prospects for quantum technologies. Using pairs of laser pulses, scientists disrupted antiferromagnetic order in one place and simultaneously studied it in another, creating ... >>

Sound-absorbing silk 17.05.2024

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 p ... >>

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Increased sodium-ion battery capacity 11.09.2021

Scientists at Chalmers University of Technology (Sweden) have used graphene to create a new type of anode for sodium-ion batteries, making them comparable in capacity to lithium-ion batteries.

Sodium-ion batteries are not used as often in mobile devices, since traditional lithium-ion batteries offer 2 times the energy density - 285 kWh / kg.

Sodium-ion battery (Na-ion) is a type of electric battery that has almost identical energy characteristics to a lithium-ion battery, but the cost of materials used in it is much lower. The big advantage of sodium-ion batteries is that they can be safely discharged to zero, which makes them safer to transport and store.

The specialists found that with a new type of graphene electrode, a sodium-ion battery is able to demonstrate similar performance: this material is able to hold the same number of sodium ions.

Sodium-ion batteries are more stable and have a lower cost - in electric vehicles and electronics they will prove useful, while lithium-ion batteries can be dangerous when overheated.

For fast charging and high battery capacity, ions must easily enter the anode material. The sodium-ion battery cathode is made from sodium oxides, and a carbon-based material is used as the anode. It can be activated carbon, but it is expensive and it is difficult to produce such cathodes. Graphite is an inexpensive analogue, but sodium ions cannot move efficiently between graphene layers.

To overcome this problem, scientists have created a new material that consists of alternating layers of graphene and benzene. The benzene layer increases the distance between the graphene layers, allowing sodium ions to move freely. In addition, benzene can form a strong bond with sodium ions.

According to the authors of the project, the capacity of such a battery is comparable to that of a lithium-ion battery: with pure graphite, the energy density is 30 mAh / g, and with the new material it rises to more than 330 mAh / g.

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