How to bend flat glass perfectly around corn…

How to bend flat glass perfectly around corners

Researchers from the Fraunhofer Institute for Mechanics of Materials IWM have developed a new process that can bend sheets of glass to produce angular corners. Unlike conventional processes, this does not impair the optical properties of the glass. Bent glass looks destined to play a key role in future building design, and there are also potential applications in the fields of medical technology and industrial design.

Generally speaking, window glass is flat. When constructing the walls of a building, apertures are therefore left for windows to later be inserted. Occasionally, however, smart office blocks and apartment buildings feature windows that wrap around the corners of the structure. To achieve this, window manufacturers join two panes of glass at an angle, using either a metal profile or an adhesive bond. Now, however, researchers from the Fraunhofer Institute for Mechanics of Materials IWM in Freiburg have developed a spectacular way of bending sheets of glass—to angles of 90°, for example—so that the corner thereby produced is sharp and angular. In other words, they have made the corner an integral part of a single sheet of glass. “We’ve already had lots of positive feedback from architects,” says Tobias Rist, a specialist in glass forming at Fraunhofer IWM and head of the Glass Forming and Machining group.“ A lot of them are now keen to know when this corner glass will be available. But our lab system only processes sheets of glass one square meter in size, so we’re only able to produce prototypes.” The research team is therefore eager to join forces with partners and scale up the process to produce larger formats.

Read more.

Regular

bubbaaaaette
replied to your photo “compoundchem: ‪Element 76 in our #IYPT2019 series with @RoySocChem is…”

How much is their in a pen nib is it entirely made out of it or just plated in it?

Typically, it’s just the tipping material in a fountain pen that needs to be wear resistant, so a very small amount:

image

Check out these sources for more info on fountain pens and tipping materials: 

( 1 – image source, on fountain pens ) ( 2 – fountain pens ) ( 3 – tipping alloys )

Researchers synthesize new liquid crystals a…

Researchers synthesize new liquid crystals allowing directed transmission of electricity

Liquid and solid—most people are unaware that there can be states in between. Liquid crystals are representative of one such state. While the molecules in liquids swim around at random, neighboring molecules in liquid crystals are aligned as in regular crystal grids, but the material is still liquid. Liquid crystals are thus an example of an intermediate state that is neither really solid nor really liquid¬¬. They flow like a liquid, and yet their molecules are grouped in small, regularly ordered units. A particular application of liquid crystals is optical imaging technology as in the screens of televisions, smartphones, and calculators. All LCD—or liquid crystal display—devices use these molecules.

Researchers at the Institute of Organic Chemistry at Johannes Gutenberg University Mainz (JGU) have synthesized novel liquid crystals in a project sponsored by the German Research Foundation (DFG). “If you slowly cool our liquid crystalline materials, the molecules align in a self-assembly process to form columns,” explained Professor Heiner Detert of JGU. “We can imagine these columns like piles of beer mats stacked one on top of the other. But the special thing is that these columns conduct electrical energy along their whole length.” The materials can thus serve as organic, liquid crystalline “power cables” and provide targeted electricity transmission in electronic components. While most materials conduct positive charges carried by holes, the new molecules actually conduct electrons. An additional advantage of a liquid crystalline power cable is that if it ruptures, any such rupture will heal entirely by itself.

Read more.

Researchers develop 3-D printing substrate w…

Researchers develop 3-D printing substrate with dynamic bonds for adjustable properties

Fantastic shapes can be made using 3-D printing, but for many applications the material used needs to be much stronger than what is currently available. This is something that chemists in Eindhoven are working on: “The material used by the current generation of 3-D printers is similar to spaghetti. We’re making spaghetti that sticks together like Velcro.”

“The research we are doing is somewhat generic, whereas in Maastricht it is more application based. That is evident from their presentations, which feature images of animals that have been cut open,” says Hans Heuts. His voice betrays a mild sense of horror, causing his colleague Rint Sijbesma to laugh out loud. Not a single drop of blood runs from their own research at the chemistry faculty of the Eindhoven University of Technology, even though it is ultimately applied in the 3-D printing of prosthetics and implants. There is an area where they and their Maastricht colleagues do have something in common, though: the groups of researchers are both developing new plastics and gels based on dynamic chemical bonds. These are chemical compounds in a substance that easily separate and yet easily rebond.

Read more.

Shape affects performance of micropillars in…

Shape affects performance of micropillars in heat transfer

As our electronic devices get more sophisticated, they also generate more heat that must be released for maximum performance. Damena Agonafer, a mechanical engineer and materials scientist in the McKelvey School of Engineering at Washington University in St. Louis, is perfecting a way to dissipate the heat through a unique process involving tiny liquid drops on top of an array of micropillars.

In new research published on the cover of the journal Langmuir Sept. 17, Agonafer, assistant professor of mechanical engineering & materials science, worked with droplets of different liquids on micropillar structures of different shapes: triangles, squares and circles. The drops on the tops of the micropillars are similar to when a glass of water is overfilled just enough to make a hemispheric shape, or a meniscus, on the top of the glass before one more drop causes it to spill over.

Agonafer’s micropillar structures hold droplets of liquid with their sharp edges that form an energy barrier on the surface that keeps the liquid from spilling over. Some liquids, such as water, create high surface tension and create maximum pressure when the contact line is pinned on the edge of the inner pore of the micropillar. Other liquids, such as isopropyl alcohol or refrigerant, create low surface tension and create maximum pressure when the contact line is pinned on the outer edge of the structure.

Read more.

Strengths & Weaknesses of Super Material…

Strengths & Weaknesses of Super Material – Soft, Light, yet Strong Enough to Stop a Bullet

Scientists from Aarhus University and the University of Cambridge are the first to measure and set guidelines for bolted joints using the up-coming replacement for Kevlar: the ultra-strong material with the catchy name ultra-high molecular weight polyethylene.

Imagine a velvety, soft material that is extremely light, but also strong enough to stop a bullet. This is close to a description of ultra-high molecular weight polyethylene (UHMWPE), a super-plastic material commercially known as Dyneema or Spectra, which is already taking over from the para-aramid fibrous material, Kevlar, in e.g. bullet-proof jackets.

There is also much need for the super material in many other applications than body armor, and therefore researchers have now set up guidelines and failure maps for use of the material in joints with steel bolts. The research team is being led by Simon Skovsgård, PhD and MSc in engineering at the Department of Engineering, Aarhus University, and Professor Norman Fleck at the University of Cambridge.

The results have just been published in the International Journal of Solids and Structures.

“The tests we’ve done showed that the material began to deform at the joints, but the fibers weren’t broken. This is interesting in relation to other popular composite materials, such as carbon fiber composites, which snaps suddenly. Here, although we can tear the material, it’s really difficult to actually break the fibers,” says Simon Skovsgård.

Read more.

A new concept could make more environmentall…

A new concept could make more environmentally friendly batteries possible

A new concept for an aluminium battery has twice the energy density as previous versions, is made of abundant materials, and could lead to reduced production costs and environmental impact. The idea has potential for large scale applications, including storage of solar and wind energy. Researchers from Chalmers University of Technology, Sweden, and the National Institute of Chemistry, Slovenia, are behind the idea.

Using aluminium battery technology could offer several advantages, including a high theoretical energy density, and the fact that there already exists an established industry for its manufacturing and recycling. Compared with today’s lithium-ion batteries, the researchers’ new concept could result in markedly lower production costs.

“The material costs and environmental impacts that we envisage from our new concept are much lower than what we see today, making them feasible for large scale usage, such as solar cell parks, or storage of wind energy, for example,” says Patrik Johansson, Professor at the Department of Physics at Chalmers.

“Additionally, our new battery concept has twice the energy density compared with the aluminium batteries that are ‘state of the art’ today.”

Read more.

Water + air + electricity = hydrogen peroxide:…

Water + air + electricity = hydrogen peroxide: Rice University breakthrough produces valuable chemical on demand at point of use

A reactor developed by Haotian Wang and his colleagues at Rice’s Brown School of Engineering requires only air, water and electricity to make the valuable chemical in the desired concentration and high purity.

Their electrosynthesis process, detailed in Science, uses an oxidized carbon nanoparticle-based catalyst and could enable point-of-use production of pure hydrogen peroxide solutions, eliminating the need to transport the concentrated chemical, which is hazardous.

By using a solid electrolyte instead of traditional liquid electrolyte, it also eliminates the need for product separation or purification used in current processes, so no contaminating ions will be involved.

“If we have electricity from a solar panel, we can literally get hydrogen peroxide from just sunlight, air and water,” said Wang. “We don’t need to involve organics or fossil fuel consumption. Hydrogen peroxide synthesis by traditional, huge chemical engineering plants generates organic wastes, consumes fossil fuels and emits carbon dioxide. What we’re doing is green synthesis.”

Read more.

The Big Sort: An Insider’s Tour of a R…

The Big Sort: An Insider’s Tour of a Recycling Plant

Every day at the Sims Municipal Recycling facility in Sunset Park, Brooklyn, roughly 800 tons of recyclables meander through a tangle of machines, scanners, and conveyor belts. Mountains of discarded metals, glass, and plastic are sifted, sorted, and bundled into bails, eventually transforming into marketable commodities.

Do NOT follow this link or you will be banned from the site!