Articles tagged with Gold
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Study of abstract structures, patterns, quantities, relationships, and logical reasoning through pure and applied mathematical disciplines. Encompasses algebra, calculus, geometry, topology, number theory, analysis, discrete mathematics, mathematical logic, set theory, probability, statistics, and computational mathematics. Investigates mathematical structures, theorems, proofs, algorithms, functions, equations, and the rigorous logical frameworks underlying quantitative reasoning. Provides the foundational language and tools for all scientific fields, enabling precise description of natural phenomena, modeling of complex systems, and the development of technologies across physics, engineering, computer science, economics, and all quantitative sciences.
Researchers have discovered unique structures of uncharged gold nano particles, which could lead to breakthroughs in catalysts for chemical reactions. The structures, formed by arranging seven gold atoms in a triangle with an additional vertex, were revealed through innovative combination of infrared spectrometry and mass spectrometry.
Researchers confirm the 'divide and protect' bonding structure in metallic gold nanoclusters, finding stability due to surface-chemical bonds and a filled electron shell. The study reveals distinct electronic properties and potential applications for nanoparticle chemistry.
Researchers have identified natural gold nanoparticles in Western Australia's groundwater, providing new insights into geological processes and potential gold deposits. The discovery could aid explorers in finding new gold deposits due to the unique properties of these nanoparticles.
Researchers found that gold nanoclusters can change shape under an applied electric field, transforming from a three-dimensional structure to a planar flat structure. Oxygenation of gold nanowires also enables magnetic properties, with conductive behavior up to a certain length and insulating behavior beyond.
Using a tabletop laser, researchers have successfully transformed pure metals into various colors, including gold, aluminum, black platinum, and blue silver. The process involves creating nanostructures on metal surfaces that selectively reflect specific colors.
Researchers at Brookhaven National Laboratory have discovered a way to use gold to prevent the destruction of platinum in fuel cell reactions, enhancing the metal's value. The new method, which involves adding gold clusters to platinum electrocatalysts, keeps the precious metal stable during accelerated stability tests.
Researchers have found a new class of gold catalysts that can act as both an acceptor and a donor of electrons in chemical reactions. This unique property allows gold to participate in reactions at carbon-carbon bonds, leading to the creation of novel organic molecules.
Researchers have unveiled the size-dependent evolution of structural and electronic structural motifs of gold nanoclusters. The experiments show near perfect agreement pertaining to the cluster structures occurring in the experiments, which is crucial for understanding their behavior as nanocatalysts or in medical applications.
Researchers at Max Planck Institute for Microstructure Physics developed single crystal silicon nanowires using an aluminium catalyst, reducing the size of microchips. The new process fulfils key criteria for industrial-scale production and could lead to improved semiconductor components.
A recent discovery in Syria has uncovered an ancient mortuary complex containing human and animal remains, gold, and silver treasures. The site, dated to the third millennium B.C., suggests a royal cemetery with signs of ritual sacrifice, including infant and animal remains.
A study by University College London archaeologists found that the humble shoelace tags were more valuable to indigenous Cubans than gold, suggesting a significant shift in trade priorities. The discovery challenges traditional views of gold's value and highlights the importance of alternative materials in pre-Columbian societies.
Researchers at JILA demonstrated that gold nanoparticles can be trapped and detected six times more easily than polystyrene particles of similar size. However, the high heating effect could damage molecules under study, limiting their use in temperature-sensitive experiments.
Researchers used X-ray spectroscopy to observe gold nano-particles' reaction with oxygen and carbon monoxide, revealing the activation mechanism of oxygen. The findings have potential applications in pollution control and hydrogen purification.
Researchers have found metal fullerene clusters, also known as hollow golden cages, composed of gold atoms. These structures are stable at room temperature and can cage smaller atoms, opening up new possibilities for influencing physical and chemical properties.
Researchers at Ohio University have discovered that gold nanoparticles can heat an area significantly larger than the nanoparticle itself, making them useful for targeting specific cells or objects. The particles' heating properties are precise and can be controlled using bio-linkers to affect specific targets.
A large-scale search for new drugs to suppress autoimmune disease symptoms led researchers to a biochemical mechanism involving gold compounds. Gold, particularly in its special form, renders MHC class II proteins inactive, a key component of the immune system involved in autoimmunity.
Researchers from Max Planck Institute and European Synchrotron Radiation Facility study gold-copper alloy corrosion process, revealing protective surface layer and gold nano-islands. The discovery provides insights into preventing corrosion in alloys used in corrosive environments.
The Homestake underground lab will host a comprehensive suite of experiments in physics and geosciences. The site's deep depths will enable studies of neutrinos, gravity, dark matter, and proton decay.
A team of Purdue chemists has found that amines can form stable bonds with gold surfaces, making them suitable for coating sensors and other devices. This discovery could expand the range of molecules used in biotech applications, particularly in biosensors that detect proteins in the blood to indicate disease.
Researchers at Michigan State University recreated a rare isotope of nickel called Ni-78, which existed briefly in the chain of events that formed elements. This breakthrough reveals that Ni-78 decays up to three times quicker than expected, changing models of element formation before Earth's creation.
Computer simulations have revealed that gold is an effective catalyst when it's in clusters of eight to two dozen atoms, and electrical charging plays a crucial role. This breakthrough has opened up new avenues for exploring environmental effects on catalysis.
Researchers have discovered a new class of water-soluble gold quantum dots with discrete excitation and emission spectra, making them potentially useful for biological labeling. The nanodots exhibit bright fluorescence and high fluorescence quantum yields, with controlled size-tunable emissions.
Scientists uncover proof Frobisher's assayers intentionally added gold to worthless black rocks, fueling an investment frenzy. Lead samples analyzed for the first time show no contamination, confirming a massive fraud.
Researchers at Lehigh University are exploring the properties of nanogold, creating nanoparticles with defined shapes and sizes to exhibit distinct properties. They can tailor these properties by varying particle size and elemental composition.
Researchers at the Weizmann Institute developed a novel nanotube composed of nanoparticles, offering tailored properties for various applications. The tubes' unique characteristics enable design of future sensors and catalysts.
The US team won a total of four medals, including two bronze and one silver each for Wei-Han Liu and Eric Brown. Benjamin Kaduk, Frances Hocutt also received two silvers respectively. The Chinese team earned the top spot with four gold medals.
The discovery could significantly reduce costs associated with producing clean energy from fuel cells. Researchers found that a tiny amount of gold or platinum is sufficient to create an active catalyst, paving the way for cost-effective hydrogen production.
Researchers have successfully created electrical wire using prions as a template, which can be coated with gold and silver particles to conduct electricity. This bottom-up approach could revolutionize the manufacturing of nanoscale microcircuits and machines.
Researchers have developed DNA scaffolding for arrays of nanoparticles, enabling the processing of large amounts of information. The technology could lead to real-time image processing and improved noise filtering, potentially even rivaling human eye speed.
The Purdue team has found a way to connect the interior of a computer with the biological world by using nanoparticles as a bridge. This technology could lead to advances in detecting biohazards such as bacteria, nerve gas, or other chemical agents.
A geologist's study suggests that melting ocean crust under volcanoes can create rich mineral deposits, such as gold and copper. The research provides new insights into the formation of these deposits, which could help identify regions with high potential for mining.
Researchers discovered a molecular phase when a cluster of atoms develops into a solid structure, revealing the smallest size of functional molecules. The study also suggests a limit on the tiniest size that electrically conductive molecules can be constructed.
Researchers have successfully used alfalfa plants as miniature factories to extract and store gold nanoparticles, offering a potential alternative to harsh chemical methods. The process uses the plant's natural physiological need to extract metals from its growth medium.
Researchers have successfully used alfalfa plants to extract gold nanoparticles from the soil, a breakthrough that eliminates the need for harsh chemicals. The study published in Nano Letters demonstrates the potential of using plants as tiny factories to produce gold nanoparticles.
The US team achieved top honors with three gold medals in 1999, including the top gold, and one silver. The students were selected from a rigorous two-week training camp and received college-level training on organic chemistry.
Scientists have discovered gold in an ancient star located 2,500 light years from Earth, providing significant insights into the formation of elements and the age of the Milky Way galaxy. The discovery was made using the Hubble Space Telescope and Keck Telescope, revealing the presence of other elements including thorium and uranium.
Researchers at Texas A&M University are refining a process using small gold clusters to improve materials, including textiles and antifreeze. This could lead to more efficient and environmentally superior production methods.
Researchers at Ohio State University have identified potential metal deposits in Saudi Arabia's western Shield area using GIS software. The analysis of over 2,100 known occurrences of gold, silver, copper, and other metals revealed large quantities of lower-grade metal, ideal for open-pit mining.
The American Chemical Society recognizes Charles Martin Hall's groundbreaking work on producing aluminum metal from ore, revolutionizing modern life. The ceremony commemorates the commercialization of aluminum in North America, marking a significant milestone in the history of chemistry.
A multidisciplinary team has successfully created through-bond electrical contacts with single molecules and achieved reproducible measurements of their conductivity. The breakthrough resolves a decades-long problem in understanding the electrical properties of small numbers of molecules.
Researchers at Penn State University and SurroMed, Inc. have developed a novel method for encoding information on the submicron scale using microscopic metallic barcodes. These patterned metallic particles can simultaneously monitor multiple biological reactions in very small volumes of fluid.
A team of UMass microbiologists led by Derek Lovley has extracted solid gold from water containing dissolved gold using iron-reducing microbes. The process involves the transfer of electrons to form a more valuable metal form, resulting in the formation of gold deposits.
The four-member US team, consisting of Sean Kedrowski, Binghai Ling, Collin Martin and Albert Wang, will participate in the international contest alongside two alternates Andrew Chi and Jonathan Choi. The competition tests high school students' proficiency in chemistry theory and laboratory experiments.
Tiny gold nanoclusters exhibit distinctly chiral properties, dramatically affecting polarized light absorption. The clusters' unique structure and conduction electron circulation produce a helical effect comparable to naturally-helical structures.
Researchers have discovered gold grains, tin-based pewter plates, and lead shots at the Blackbeard's flagship wreck, providing insights into the treasure's composition and burial conditions. The findings are part of two studies presented at the Southeastern Section Geological Sciences Association Meeting on March 23.
Researchers at the Fritz Haber Institute developed a method to form nanometer-sized clusters and etch metal surfaces using ultrashort voltage pulses. This technique enables the creation of structures on the atomic scale, opening new avenues for electronics and micromachining.
Researchers at Ohio State University developed a technique to create ultra-smooth gold surfaces, more than 10 times smoother than existing ones. This breakthrough can be used for scanning tunneling microscopy of biological molecules and making reflective coatings for large X-ray mirrors.