Keyword: chemistry

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  • Something odd: Tetraxenongold

    08/18/2010 8:51:31 AM PDT · by OneWingedShark · 23 replies
    Self ^ | 18 Aug 10 | Self
    I was browsing around wikipedia and came across this: http://en.wikipedia.org/wiki/Tetraxenonogold%28II%29 It's really odd because Gold and Xenon are both notoriously unreactive. Now I don't know a lot about chemistry, but this piques my interest (on account of its extreme weirdness) and I was wondering if any of my fellows here might know about its physical properties.
  • A Cheap, Fast Way to Write Nanoscale Patterns

    08/06/2010 9:33:02 PM PDT · by neverdem · 10 replies
    ScienceNOW ^ | August 6, 2010 | Robert F. Service
    Enlarge Image Hybrid. A new nanopatterning technique combines the advantages of near-field microscopy with photolithography. Credit: Mirkin Group/International Institute for Nanotechnology, Northwestern University Today's microchips, communications gear, and medical diagnostics are typically made by writing nanoscale patterns over large areas of silicon wafers and other high-tech materials. The process is either extremely expensive or painfully slow, however. Now scientists have come up with a hybrid approach that could offer researchers a way to craft prototype nanoscale devices quickly and cheaply, speeding up the already blistering pace of developments in the field. The standard computer chip–patterning technique, called photolithography, works...
  • Revealing fake money

    07/02/2010 10:00:04 PM PDT · by neverdem · 22 replies · 4+ views
    Highlights in Chemical Science ^ | 02 July 2010 | Rebecca Brodie
    A simple and fast technique to examine the surface of banknotes and identify counterfeits has been developed by scientists in Brazil and the US.The counterfeiting of banknotes is a global problem that is increasing in scale and sophistication. Counterfeiters now use computerised reproduction methods like scanners and laser printers to copy real notes, and gone are the days when a fake could be spotted by simply testing the look and feel of the paper.The new technologies used by counterfeiters have thrown out a challenge to law enforcement. 'Forensic laboratories are therefore confronted with an increasing demand to analyse larger numbers...
  • AQ IN NORTHERN IRAQ: SEEKING A CHEMIST OR BIOLOGIST

    06/07/2010 3:04:24 PM PDT · by Cindy · 9 replies · 37+ views
    INTERNET HAGANAH.com ^ | June 7, 2010 | n/a
    07 June 2010 "AQ IN NORTHERN IRAQ: SEEKING A CHEMIST OR BIOLOGIST"
  • Setting traps for uranium

    05/23/2010 8:58:49 PM PDT · by neverdem · 17 replies · 468+ views
    Highlights in Chemical Science ^ | 21 May 2010 | Yuandi Li
    It could be possible to get uranium from seawater in the future, claim US scientists who have devised a new way to extract uranyl ions from aqueous solutions. With the rapid depletion of fossil fuels, the search for alternative power sources is becoming increasingly important. One alternative is nuclear fission, making uranium - the fuel used in nuclear reactors - an important target for isolation. Although uranium is currently extracted from solid ores such as uraninite, it also exists in large quantities as uranyl ions (UO22+) in seawater. However, due to its distinctive shape that prevents the use of conventional...
  • Light sparks new approach to data storage

    05/23/2010 8:08:54 PM PDT · by neverdem · 17 replies · 688+ views
    Chemistry World ^ | 23 May 2010 | Jon Cartwright
    Chemists in Japan have created the first material that can undergo a photoreversible transition from metal to semiconductor. The breakthrough heralds applications in ultra high density data storage, with 500 times the density of a Blu-ray disc.The past decade has seen a growing interest in ways to switch the physical properties of matter. Temperature and pressure can both turn materials, say, from insulators to metals, or from non-magnetic to magnetic, but they are difficult to control in complex memory devices. As a result, researchers have been looking at photoinduced phase transitions, for which the key stimulus is laser light. Recently, laser...
  • Producing hydrogen from sea water

    05/03/2010 10:50:42 PM PDT · by neverdem · 54 replies · 1,257+ views
    Chemistry World ^ | 28 April 2010 | Mike Brown
    A new catalyst that generates hydrogen from sea water has been developed by scientists in the US. This new metal-oxo complex displays high catalytic activity and stability, whilst being low cost, the researchers say.Hydrogen is very attractive as a clean source of power. Currently, it is produced by natural gas reforming - where steam is reacted with methane in the presence of a nickel catalyst to form hydrogen - but this method produces the greenhouse gas carbon dioxide.Jeffrey Long and colleagues from the University of California, Berkeley, prepared a simple molybdenum-oxo complex that can serve as an electrocatalyst, reducing the energy required to generate hydrogen...
  • Jet fuels from biomass

    04/30/2010 8:15:19 PM PDT · by neverdem · 10 replies · 435+ views
    Highlights in Chemical Science ^ | 27 April 2010 | Nicola Wise
    Biomass-derived fuels take a step closer to solving the energy problem thanks to a new process developed by US scientists. As fossil fuel resources continue to diminish, there is a greater need for developing new approaches for producing fuels from renewable resources. Solar cells and hydrogen fuel could provide long term solutions but the most immediate option is substitution of petrol with biofuels. First-generation biofuels such as bioethanol and biodiesel have shown this is possible but they can only satisfy a small portion of the energy demands of the transportation sector and they also use edible biomass as a feedstock increasing competition...
  • New Element Discovered! But don't ask about its name.

    04/07/2010 12:47:04 AM PDT · by smokingfrog · 8 replies · 474+ views
    discoverymag ^ | 4-6-10 | Smriti Rao
    A little square that has been left blank on the periodic table for all these years might finally be filled in. A team of American and Russian scientists have just reported the synthesis of a brand new element–element 117. Says study coauthor Dawn Shaughnessy: “For a chemist, it’s so fundamentally cool” to fill a square in that table [The New York Times]. If other scientists confirm the discovery, the still-unnamed element will take its place between elements 116 and 118, both of which have already been tracked down. A paper about element 117 will soon be published in Physical Review...
  • Hydrocarbon turns superconductor

    03/04/2010 6:44:19 PM PST · by neverdem · 15 replies · 659+ views
    Chemistry World ^ | 03 March 2010 | Jon Cartwright
    Researchers in Japan have created the first superconducting material based on a molecule of carbon and hydrogen atoms. Although the superconducting transition occurs at a chilly 18K, the simplicity of the molecule, which consists of just five benzene rings, suggests that it will open the door to other molecules that have higher transition temperatures.Superconductivity occurs when a material is cooled below a certain transition temperature (Tc) so that its electrical resistance disappears. The first superconductors were pure metals and had Tc  values close to absolute zero, but over the past 25 years scientists have begun to discover various 'high-Tc' materials, including...
  • To catch a cheating athlete (2010 Winter Olympics)

    02/20/2010 3:12:12 PM PST · by neverdem · 13 replies · 824+ views
    Chemistry World ^ | 08 February 2010 | Rajendrani Mukhopadhyay
    /Washington DC, USAs the athletes take centre stage at the Vancouver 2010 Winter Olympics and Paralympic Winter Games this month, chemists will be hard at work behind the scenes to catch athletes looking to win by taking drugs or blood products to artificially boost their performance during the competition.Doping is as old as the games - the ancient Greeks ate special diets and potions to enhance their athletic prowess - but over time, the practice has become considerably more sophisticated. Sports authorities began introducing drug testing in the 1970s and today, a variety of techniques exist in specialised anti-doping laboratories to catch...
  • Dipstick test for toxic lead

    02/01/2010 1:29:34 PM PST · by neverdem · 10 replies · 283+ views
    Highlights in Chemical Science ^ | 01 February 2010 | Victoria Steven
    Scientists in the United States have produced a simple dipstick test for detecting lead levels in paints. Easy-to-use biosensors are important for detection of highly toxic trace metal ions in the environment. Cross-linked gold nanoparticles modified with metal-specific DNAzymes have been used in solution to create highly sensitive and selective colorimetric metal sensors based on the colour change between aggregated (blue) and dispersed (red) gold nanoparticles. However, in solution the colour change can be difficult to distinguish and nanoparticle stability is poor, explains Yi Lu at the University of Illinois at Urbana Champaign. Lu and colleagues have developed a sensor that uses...
  • Symmetry springs a surprise

    01/13/2010 4:49:33 PM PST · by neverdem · 10 replies · 522+ views
    Highlights in Chemical Science ^ | 12 January 2010 | David Barden
    Usually, you'd expect two compounds with the same composition, atom-to-atom connectivity and symmetry to be chemically identical too. But scientists investigating metal-organic frameworks have discovered a surprising exception to this rule by identifying two isomers with the same symmetry and bonding but different gas storage properties. A team led by Shengqian Ma at the Argonne National Laboratory, Illinois, US, investigated a rod-like tetracarboxylate molecule (ebdc) which can bind to a metal atom from any one of four binding points, one at each corner of a rectangle. When it was heated with a copper salt at 75 °C, a crystal phase formed...
  • Cutting edge chemistry in 2009

    12/27/2009 7:39:58 PM PST · by neverdem · 7 replies · 646+ views
    Chemistry World ^ | 18 December 2009 | Nina Notman
    What revelations caused the biggest buzz in chemistry labs around the globe during 2009? With the help of an expert panel of journal editors, Chemistry World reviews the ground-breaking research and important trends of the year's published chemical science papers. Life in 3D DNA origami, the folding of DNA into shapes on the nanoscale, moved from 2D into 3D during 2009. Hao Yan's team at Arizona State University kicked off this craze with a tetrahedron shaped 3D container made of DNA.1 A day later, Danish researchers led by Kurt Gothelf, from Aarhus University, published details of a nanosized 3D DNA...
  • By Happy Accident, Chemists Produce a New Blue

    11/27/2009 10:40:14 PM PST · by neverdem · 30 replies · 2,297+ views
    NY Times ^ | November 24, 2009 | KENNETH CHANG
    Blue is sometimes not an easy color to make. Blue pigments of the past have often been expensive (ultramarine blue was made from the gemstone lapis lazuli, ground up), poisonous (cobalt blue is a possible carcinogen and Prussian blue, another well-known pigment, can leach cyanide) or apt to fade (many of the organic ones fall apart when exposed to acid or heat). So it was a pleasant surprise to chemists at Oregon State University when they created a new, durable and brilliantly blue pigment by accident. The researchers were trying to make compounds with novel electronic properties, mixing manganese oxide,...
  • How Crystals Get Their Groove Back

    11/22/2009 10:32:39 AM PST · by neverdem · 11 replies · 703+ views
    ScienceNOW Daily News ^ | 20 November 2009 | Michael Torrice
    Enlarge ImageBetter angle. Computer-simulated molecules crystallize faster in the more comfy 70-degree groove (left) than the cramped 45-degree wedge (right). Credit: A. J. Page and R. P. Sear, J. A. Chem. Soc., Online publication (11/13/2009) If you ever took a chemistry lab class in college, chances are you once stared desperately at a flask of liquid, crossing your fingers for tiny crystals to appear. Your lab instructor may have offered advice that sounded like voodoo: "Scratch the inside of the flask to make the crystal grow." But the trick worked--and now scientists have uncovered new details behind it. Compared...
  • Insect Wing Photocopied for Good

    11/16/2009 9:05:06 AM PST · by GodGunsGuts · 39 replies · 1,922+ views
    CEH ^ | November 15, 2009
    Nov 15, 2009 — Biomimetics is the new science of imitating nature – but why not save a step, and just copy the design directly?  That’s what Aussie and British researchers did.  They wanted a self-cleaning surface that could repel moisture and dust, so they made a template of an insect wing.  And why not?  “Insects are incredible nanotechnologists,” reported Science Daily.  Their wings are self-cleaning, frictionless and super-water-repellant. Insect wings have these properties due to their properties at the scale of billionths of a meter.  “For instance, some wings are superhydrophobic, due to a clever combination of natural chemistry...
  • Carbonic acid captured

    11/13/2009 11:09:45 PM PST · by neverdem · 9 replies · 739+ views
    Chemistry World ^ | 12 November 2009 | Simon Hadlington
    Scientists from Germany and Israel have caught a fleeting glimpse of carbonic acid, the simple yet elusive molecule that plays a key role in nature, from regulating the pH of blood to mediating crucial events in the global carbon cycle. And it appears that the acid is not as weak as the textbooks would have us believe.Carbonic acid, the hydrated form of carbon dioxide, is an important molecule that is involved in buffering biological fluids such as blood and is a key intermediate in the exchange of carbon dioxide between the atmosphere and the oceans. However, it is so short-lived in solution...
  • Sir Ambrose Fleming: Father of Modern Electronics (and Creationist!)

    11/09/2009 5:50:41 PM PST · by GodGunsGuts · 18 replies · 1,081+ views
    ACTS & FACTS ^ | November 2009 | Jerry Bergman, Ph.D.
    Sir Ambrose Fleming: Father of Modern Electronics --snip-- Sir John Ambrose Fleming was a leader in the electronics revolution that changed the world. As a professor at a major university, he carefully researched the evidence for Darwinism, concluding that the theory is not supported by science. He also influenced hundreds of students to evaluate the evidence in science for Darwinism. An outstanding scientist and creationist, he played a significant role in the development and maturation of the early creation movement. As Travers and Muhr wrote, he "had an unusually long and active life," and his life changed the world as...
  • Nerve gas detection in a fraction of a second

    10/03/2009 10:23:04 PM PDT · by neverdem · 6 replies · 701+ views
    Chemistry World ^ | 24 September 2009 | Lewis Brindley
    A new molecule that detects and destroys lethal nerve gases has been developed by researchers in the US. It is hoped that the research will help develop new early-warning systems against chemical weapon attacks, and possibly give rise to an effective antidote. Originally developed during the lead up to the second world war, organophosphorus nerve gases such as sarin, tabun and soban are odourless and colourless - and exposure to even a small amount can be fatal within minutes. Despite being outlawed by chemical weapons conventions in the 1990s, their relatively straightforward chemical structure means they could conceivably be deployed by...