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Nanowerk (EUA)
Em 2025: 0 notícias
Desde 1995: 36 notícias
Quantum phase transition discovered in a quasi-2D system consisting purely of spins
Publicado em 12 de julho de 2021
(Nanowerk News) Pure quantum systems can undergo phase transitions analogous to the classical phase transition between the liquid and gaseous states of water. At the quantum level, however, the particle spins in states that emerge from phase transitions display collective entangled behavior. This unexpected observation offers a new avenue for the production of materials with topological properties that are useful in spintronics applications and quantum computing.
The discovery was made by an [...]
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Use of perovskite nanomaterials will be a key feature of the next generation of electronic appliances
Publicado em(Nanowerk News) Quantum dots are manmade nanoparticles of semiconducting material comprising only a few thousand atoms. Because of the small number of atoms, a quantum dot's properties lie between those of single atoms or molecules and bulk material with a huge number of atoms. By changing the nanoparticles' size and shape, it is possible to fine-tune their electronic and optical properties - how electrons bond and move through the material, and how light is absorbed and emitted by [...]ver notícia -
Industrial waste is reused to produce alternatives to plastic
Publicado em 14 dezembro 2020(Nanowerk News) Researchers at São Paulo State University (UNESP) in Ilha Solteira have developed a film that can replace plastic in food packaging. The film is made from hydroxypropyl methylcellulose (HPMC) and bacterial cellulose scraps left over from industrial processing. Both raw materials are sustainable. They are combined to produce a biodegradable film of bacterial cellulose nanocrystals and HPMC. The product outperforms film made of HPMC alone. An article on the research [...]ver notícia -
Researchers develop flat lens a thousand times thinner than a human hair
Publicado em 24 agosto 2020(Nanowerk News) A lens that is a thousand times thinner than a human hair has been developed in Brazil by researchers at the University of São Paulo’s São Carlos School of Engineering (EESC-USP). It can serve as a camera lens in smartphones or be used in other devices that depend on sensors. “In the present technological context, its applications are almost unlimited,” says Emiliano Rezende Martins, a professor in EESC-USP’s Department of Electrical [...]ver notícia -
Edible, biocompatible and biodegradable optical fiber made of gel derived from marine algae
Publicado em 24 julho 2020(Nanowerk News) - An optical fiber made of agar has been produced at the University of Campinas (UNICAMP) in the state of São Paulo, Brazil. This device is edible, biocompatible and biodegradable. It can be used in vivo for body structure imaging, localized light delivery in phototherapy or optogenetics (e.g., stimulating neurons with light to study neural circuits in a living brain), and localized drug delivery. Another possible application is the detection of microorganisms in [...]ver notícia -
A population of asteroids of interstellar origin inhabits the Solar System
Publicado em 17 julho 2020(Nanowerk News) - A study conducted by scientists at São Paulo State University's Institute of Geosciences and Exact Sciences (IGCE-UNESP) in Rio Claro, Brazil, has identified 19 asteroids of interstellar origin classified as Centaurs, outer Solar System objects that revolve around the Sun in the region between the orbits of Jupiter and Neptune. An article on the study is published in the Royal Astronomical Society's Monthly Notices ("An interstellar origin for [...]ver notícia -
Solar system acquired current configuration not long after its formation
Publicado em(Nanowerk News) The hypothesis that the Solar System was born from a gigantic cloud of gas and dust was first floated in the second half of the eighteenth century. It was proposed by German philosopher Immanuel Kant and developed by French mathematician Pierre-Simon de Laplace. It is now a consensus among astronomers. Thanks to the enormous amount of observational data, theoretical input and computational resources now available, it has been continually refined, but this is not a linear [...]ver notícia -
Theorem explains why quantities such as heat and power can fluctuate in microscopic system
Publicado em 26 novembro 2019(Nanowerk News) - The second law of thermodynamics states that the total entropy of an isolated system always tends to increase over time until it reaches a maximum. In other words, disorganization increases without outside intervention. Even the best electrical equipment inevitably heats up, as part of the energy that should be converted into mechanical work is dissipated in the form of heat, and supposedly inanimate objects deteriorate as time progresses but do not spontaneously [...]ver notícia -
Ultrafast particle interactions could help make quantum information devices feasible
Publicado em 16 outubro 2019(Nanowerk News) Energy is information. Lengthening the time during which a system is capable of retaining energy before losing it to the local environment is a key goal for the development of quantum information. This interval is called the "coherence time". Several studies have been performed with the aim of retarding decoherence. A study conducted by researchers at the University of Campinas's Gleb Wataghin Institute of Physics (IFGW-UNICAMP) in São Paulo State, Brazil, [...]ver notícia -
Nanostructured material with potential for use in catalyzers
Publicado em 30 agosto 2019(Nanowerk News) Titanium oxide (TiO2) nanofibers can have various applications, such as in catalyzers and filters. When TiO2 is excited by ultraviolet light, it degrades organic material. Hence, TiO2 can be applied to filter wastewater for reuse, for example. A new method of fabricating these fibers has been developed in Brazil by Rodrigo Savio Pessoa and Bruno Manzolli Rodrigues, researchers at the Aeronautical Technology Institute's Plasma and Process Laboratory (LPP-ITA) and the Science [...]ver notícia