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Category: materials – Page 268

Scraping an icy windshield can be a seasonal struggle for those that live in colder climates. But engineers from UBC’s Okanagan campus are aiming to ease that winter frustration with a new surface coating that can shed ice from large areas using little effort.

The new anti-ice coating is a new class of surfaces called low interfacial toughness (LIT) and were developed by UBC Okanagan researchers in a new study published this week in the journal Science.

“For those experienced in the early morning scrape, it should come as no surprise that it normally takes quite a lot of force to remove large areas of ice,” explains Kevin Golovin, assistant professor at the UBCO School of Engineering and study lead author. “That’s not the case with LIT materials. Imagine simply brushing the ice away or letting it sliding off the windshield from its own weight—that’s how effective LIT materials can be.”

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Circa 2014

Be amazed as Adam Savage and Jamie Hyneman introduce us to a whole new way of thinking about glass. Learn the history of glass innovation and watch incredible demonstrations of bendable optical fiber and thin, ultra-flexible glass. This is the Glass Age, where materials science is constantly pushing boundaries and creating new possibilities for glass-enabled technology and design. See how glass is shaping the future at www.TheGlassAge.com

Presented by Corning.

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Scientists find surprising way to affect information storage properties in metal alloy.

Sometimes scientific discoveries can be found along well-trodden paths. That proved the case for a cobalt-iron alloy material commonly found in .

As reported in a recent issue of Physical Review Letters, researchers from the U.S. Department of Energy’s (DOE) Argonne National Laboratory, along with Oakland University in Michigan and Fudan University in China, have found a surprising quantum effect in this alloy.

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This article is the first part in a series on smart cities. See more from Christine Wong.

Smart cities are coming under siege.

In Songdo, South Korea, clusters of concrete high-rises sit empty, waiting for an influx of foreign workers that hasn’t materialized. The $40 billion smart city, which was to be completed last year, is only 70 percent finished. Just 100,000 people live in Songdo so far, well short of its target population of 300,000.

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A team of Japanese researchers has—for the first time—demonstrated preserving frozen animal cells without a cryoprotectant agent (CPA), a substance that can protect biological material from freezing damage. To keep cells alive, all the conventional freezing methods needed to add a CPA, which can be potentially toxic and associated with cell damage and death. Their method only relies on ultrarapid cooling—or really fast freezing—for cells and vital biological material during freezing process. A safe freezing without CPA method would not only revolutionize how important research and medical material is stored, but greatly advance any and all research methods within those fields. The study was published in Proceedings of the National Academy of Sciences (PNAS) on April 1st, 2019.

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A pair of researchers at Tokyo Institute of Technology (Tokyo Tech) describes a way of making a submicron-sized cylinder disappear without using any specialized coating. Their findings could enable invisibility of natural materials at optical frequency and eventually lead to a simpler way of enhancing optoelectronic devices, including sensing and communication technologies.

Making objects invisible is no longer the stuff of fantasy but a fast-evolving science. ‘Invisibility cloaks’ using metamaterials—engineered materials that can bend rays of light around an object to make it undetectable—now exist, and are beginning to be used to improve the performance of satellite antennas and sensors. Many of the proposed metamaterials however only work at limited wavelength ranges such as microwave frequencies.

Now, Kotaro Kajikawa and Yusuke Kobayashi of Tokyo Tech’s Department of Electrical and Electronic Engineering report a way of making a without a cloak for monochromatic illumination at optical frequency—a broader range of wavelengths, including those visible to the human eye.

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Scientists from Tomsk Polytechnic University (TPU), together with colleagues from the United States and Germany, have found a way to obtain inexpensive catalysts from hexagonal boron nitride or “white graphene.” The technology can be used in the production of environmentally friendly hydrogen fuel.

The researchers have found a new way to functionalize a dielectric, otherwise known as white graphene, i.e. (hBN), without destroying it or changing its properties. Thanks to the new method, the researchers synthesized a polymer nano carpet with strong covalent bond on the samples.

Prof Raul Rodriguez from the TPU Research School of Chemistry & Applied Biomedical Sciences explains:

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Researchers at the University of Fribourg’s Adolphe Merkle Institute (AMI) and Hokkaido University in Japan have developed a method to tailor the properties of stress-indicating molecules that can be integrated into polymers and signal damages or excessive mechanical loads with an optical signal.

As part of their research activities within the National Center of Competence in Research Bio-inspired Materials, Professor Christoph Weder, the chair of Polymer Chemistry and Materials at AMI, and his team are investigating polymers that change their color or characteristics when placed under mechanical load. The prevailing approach to achieve this function is based on specifically designed sensor that contain weak chemical bonds that break when the applied mechanical force exceeds a certain threshold. This effect can cause a color change or other pre-defined responses. A fundamental limitation of this approach, however, is that the weak bonds can also break upon exposure to light or heat. This lack of specificity reduces the practical usefulness of stress-indicating polymers. It normally also makes the effect irreversible.

Addressing this problem, Weder and Dr. Yoshimitsu Sagara—a Japanese researcher who spent two years in Weder’s group at AMI before joining Hokkaido University as an Assistant Professor—devised a new type of sensor molecule that can only be activated by mechanical force. Unlike in previous force-transducing molecules, no chemical bond breaking takes place. Instead, the new sensor molecules consist of two parts that mechanically interlock. This interconnection prevents the separation of the two parts, while still allowing them to be pushed together or pulled away from each other. Such molecular pushing and pulling causes the molecule’s fluorescence to change from off to on.

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A new and greatly improved version of an electronic tag, called Marine Skin, used for monitoring marine animals could revolutionize our ability to study sea life and its natural environment, say KAUST researchers.

Marine Skin is a thin, flexible, lightweight polymer-based material with integrated electronics which can track an animal’s movement and diving behavior and the health of the surrounding . Early versions of the sensors, reported previously, proved their worth when glued onto the swimming crab, Portunus pelagicus.

The latest and much more robust version can operate at unprecedented depths and can also be attached to an animal using a noninvasive bracelet or jacket. This can, when necessary, avoid the need for any glues that might harm an animal’s sensitive skin.

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The strongest synthetic materials are often those that intentionally mimic nature.

One natural substance scientists have looked to in creating is , also known as mother-of-pearl. An exceptionally tough, stiff material produced by some mollusks and serving as their inner shell layer, it also comprises the outer layer of pearls, giving them their lustrous shine.

But while nacre’s make it an ideal inspiration in the creation of synthetic , most methods used to produce artificial nacre are complex and energy intensive.

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