Ceramic gets wet slowly. Free Technical Library News

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Ceramic gets wet slowly

17.02.2010

Chemist Moira Wilson from the University of Manchester (UK) has proposed a new method for determining the age of ancient pottery. It turns out that the minerals that make up ceramics, after firing and cooling, begin to slowly hydrate - to attach moisture from the air to themselves. By the amount of water in hydrated minerals, you can determine when the product was fired.

Experiments on bricks and vessels aged 2000 years, determined by other methods, showed the high accuracy of the new technique.

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Professor of Optics Federico Capasso (Federico Capasso) and his colleagues from Harvard University (USA) have developed the first ultra-thin flat lens that covers the entire spectrum of visible light. This technology is seen as revolutionary because in the near future it will be used in all new devices - from microscopes to cameras - replacing old-generation lenses.

As they worked, the team looked for a material that would not absorb or scatter light, as they needed to concentrate the red, blue, and green spectra of visible light into the lens. In addition, to be cost effective, material already available in the industry had to be used.

Scientists settled on titanium dioxide, a metal that is widely used today in all areas of production - from electronics to household chemicals. From this material, they made the "heart" of the lens - an array of smooth nanostructures with a clear aspect ratio.

“We wanted to create a flat lens with a high numerical aperture, that is, capable of focusing light in an area smaller than the wavelength of the light. The more densely you can focus the light, the smaller the focal area can be, potentially increasing image resolution,” said Mohammadreza Khorasaninejad, one of the authors of the project.

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The new technology not only promises to reduce the weight and bulk of lenses, making them thinner than paper, but it will also be substantially cheaper to manufacture.

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