The phenomenon of Brownian motion (after botanist Robert Brown, who discovered it 1828) was described by Albert Einstein in 1905, when he published his statistical molecular theory of liquids. Brownian motion is basically the random movement of particles within a fluid.
As a new study by University of Illinois scientists shows, Brownian motion is, perhaps, not as mathematically applicable as previously thought. Einstein thought if the motions of many particles were watched, and the distance each moved in a certain time were recorded, the distribution would resemble the familiar Gaussian, bell-shaped curve used to assign grades in a science class. But was Einstein right?
A team of scientists say they have discovered a method for attaching molecules to semiconducting silicon that may help manufacturers end-run the current limits of Moore's Law in the quest to make microprocessors smaller and more powerful. Moore's Law is named after Intel co-founder Gordon Moore who said in 1965 that the number of transistors that can be placed on an integrated circuit doubles about every two years. But even Moore said the law cannot be sustained indefinitely. Or can it?
Nicolaus Copernicus (1473-1543) discovered that the Earth orbits the Sun, thus paving the way for our modern view of the world. It took a few hundred years for religion to apologize for the reception his discovery got but luckily the the International Union of Pure and Applied Chemistry (IUPAC) only took a dozen years after the discovery of element 112 to honor him.
Element 112 was discovered at the GSI Helmholtzzentrum für Schwerionenforschung (Center for Heavy Ion Research) in Darmstadt.
Researchers have developed an environmentally-friendly lubricating grease based on ricin oil and cellulose derivatives, according to the journal Green Chemistry. Bonus: the new formula does not include any of the contaminating components used to manufacture traditional industrial lubricants.
Lubricants used in industry are made from non-biodegradable components, such as synthetic oils or petroleum derivatives, and thickeners made with metallic soaps or polyurea derivatives (a family of synthetic polymers). These are currently the best performers, but they also imply more problems from an environmental perspective.
Stress and strain research got a boost thanks to research from NIST, where scientists have recently found evidence of an important similarity between the behavior of polycrystalline materials, like metals and ceramics, and glasses.
Most metals and ceramics used in manufacturing are polycrystals. The steel in a bridge girder is formed from innumerable tiny metal crystals that grew together in a patchwork as the molten steel cooled and solidified. Each crystal, or “grain,” is highly ordered on the inside, but in the thin boundaries it shares with the grains around it, the molecules are quite disorderly.
A new National Institute of Standards and Technology (NIST) assay using a “glow or no glow” technique may soon help the U.S. Department of Homeland Security (DHS) defend the nation against a spectrum of biological weapons that could be used in a terrorist attack.
One very dangerous toxin on the list is ricin, a protein derived from castor beans that is lethal in doses as small as 500 micrograms—about the size of a grain of salt.
There is beauty in strange places. An ordinary life can leave traces of us that gather into something oddly appealing. Something more than the sum of its parts.
Five-fold symmetry is considered to be impossible in crystallography for the same reason that pentagonal tiles do not exist - it is not possible to cover a floor or wall simply using tiles with five sides of all the same length.
The only way around the problem is to use other geometrical shapes to fill in the gaps, a principal used by the builders of mosques as long ago as the 15th century. The complex ornamental structure was "rediscovered“ by mathematicians last century.
Roger Penrose demonstrated a pattern named the Penrose Parquet, which achieves complete coverage following simple rules using two periodically repeating geometrical forms.
Scientists in Germany and India are reporting development of a new cobalt imprinted polymer that reduces the amount of radioactive waste produced during routine operation of nuclear reactors. Their study, which details a first-of-its-kind discovery, has been published in Industrial&Engineering Chemistry Research.