Articles tagged with Gold
Researchers at Aalto University have developed a non-toxic alternative to traditional cyanide-based gold extraction processes. The new chloride-based method, called EDRR, achieves an impressive 84% gold recovery rate, surpassing the 64% recovered with traditional cyanide methods.
Researchers have found compounds based on gold, silver, and copper that can store hydrogen in a stable manner. These 'metal hydride' complexes could be used to store hydrogen for use in vehicles, potentially revolutionizing the production of clean energy.
A team of researchers at Tokyo University of Science has developed a stable and highly active photocatalyst from gold nanoclusters. By removing the protective molecules around the nanoclusters, they were able to increase their catalytic activity and stability, opening up new possibilities for hydrogen generation and other applications.
Researchers have developed a flexible and wearable X-ray detector using metal-organic frameworks (MOFs) that don't contain harmful heavy metals. The device shows high-sensitivity sensing and imaging capabilities, making it suitable for various radiation monitoring and medical imaging applications.
Researchers found that arsenic drives the concentration of gold, explaining how iron sulfides capture and release gold. The study may lead to new sources of gold and improved processing methods.
Researchers have discovered a new type of 'invisible' gold hosted in nanoscale crystal defects within pyrite. The study provides insights into a potentially more environmentally friendly gold extraction method using selective leaching.
Researchers developed a gold leaf electrode system that sensitively detects human papillomavirus (HPV) DNA using CRISPR-based assay. The method is simple, affordable and adaptable to detect other viral infections, addressing a need for diagnostic tests in low-resource settings.
Researchers at Brown University have developed a method to create solid metal structures by smashing individual metal nanoclusters together. The technique, which involves chemical treatment and pressure, produces metals with uniform grain sizes that can be precisely tuned for enhanced properties.
A new study finds that mine ponds created by artisanal gold miners have increased the risk of mercury poisoning in Peru's Amazon. The proliferation of these ponds has amplified the environmental and human health risks associated with mercury exposure.
Researchers have synthesized a porphyrin polymer that can capture precious metals from chemically digested electronic waste. The polymer, COP-180, shows high efficiency in capturing gold, with an estimated worth of $64 per $5 of the material.
Researchers successfully pressured tiny gold particles to assess their behavior under current flow, finding that gold behaves like a solid even at nanoscale. This discovery allows chip designers to continue using gold for critical wires in next-generation data processing devices.
Twelve UNIST students have won a total of 2 Gold, 3 Silver, and 5 Bronze awards at the 2020 Samsung Humantech Paper Awards. The winners include TaeJung Lim and MinHo Seong for their innovative research in mechanical engineering and energy/environment.
Researchers developed a Noncontact Catalysis System (NCCS) to accelerate chemical reactions using gold nanoclusters as intermediaries, enabling independent reactions of normally incompatible substances. This breakthrough could lead to more versatile, efficient, and cost-effective industrial chemical production processes.
Researchers at NRL have discovered a new platform for quantum technologies by suspending two-dimensional (2-D) crystals over pores in a slab of gold. This approach may help develop new materials for secure communication and sensing technologies based on unique atomic laws.
The study found that the depth of porphyry copper and gold deposits influences their composition, with deeper deposits containing more copper and shallower deposits containing more gold. Over 95% of gold is lost to the atmosphere through volcanic emissions, making it challenging for companies to extract this metal.
Researchers at ETH Zurich develop a new form of 18-carat gold that weighs about five to ten times less than traditional gold, with a density of just 1.7 g/cm3. The lightweight gold is created by embedding thin discs of gold nanocrystals in a matrix of protein fibres and polymer latex.
Researchers have discovered that freestanding gold clusters of twenty atoms take on a pyramidal shape with a triangular ground plane and additional triangles. The study reveals the cluster's unusual electronic structure, which is similar to noble gas atoms or aromatic molecules, making them less reactive.
Osaka University researchers use in situ environmental transmission electron microscopy to visualize atomic dynamics on metal surfaces under atmospheric conditions. They track progressive changes at the surface of gold electrodes during oxidation reactions, providing new insights into materials science.
Researchers at the University of Leeds have created a new form of gold that is just two atoms thick, making it the thinnest unsupported gold ever created. The ultra-thin gold material has been shown to be 10 times more efficient as a catalytic substrate than traditional gold nanoparticles.
Researchers at Tokyo Tech and NTT Advanced Technology Corporation have developed a low noise and high sensitivity MEMS accelerometer with a mass per area increase using multi-layer gold structures. This breakthrough enables high-resolution accelerometers to detect 1 μG level input acceleration, with applications in medical technology, ...
Researchers at Tata Institute of Fundamental Research have developed black (nano)gold that can catalyze CO2 conversion to methane at atmospheric pressure and temperature, utilizing solar energy. The material exhibits significant effects on purification of seawater, protein unfolding, and chemical reactions.
New research suggests that most of Earth's heavy elements, including gold and platinum, were spewed from collapsars, a rare type of star explosion. This finding challenges the widely held belief that these elements come from collisions between neutron stars or black holes.
Researchers from Moscow Institute of Physics and Technology have synthesized a quasi-2D gold film by using monolayer molybdenum disulfide as an adhesion layer. The resulting ultrathin films conduct electricity well and are useful for flexible and transparent electronics.
Scientists have developed a technique to produce highly ordered particle layers using tiny gold particles encapsulated in soft polymer beads. The resulting ultrathin superlattices exhibit collective resonances when excited by light, enabling potential applications in optoelectronics and nanophotonics.
A team of researchers has discovered that arsenic plays a crucial role in extracting gold from hot solutions and forms large gold deposits. The study found that the concentration of arsenic directly affects the formation of giant gold deposits, with higher arsenic levels leading to more frequent gold binding with pyrite.
Scientists from Michigan Technological University have successfully created 2D gold quantum dots that can be customized at the atomic level on boron nitride nanotubes. This breakthrough enables the creation of tunable semiconducting materials with potential applications in future electronics and quantum computing.
Researchers at Tohoku University have developed a technique to transform copper into a material that mimics properties of gold and silver. The new medium, made of copper nanoparticles, has applications in the production of electronic devices and is suitable for environmentally friendly printing technologies.
Researchers at University of Oxford and University of Jyväskylä have discovered a gold compound that reacts with carbon dioxide to form a product where the gold atom attacks the central carbon atom. This finding marks the first example of nucleophilic reactivity by molecular gold, enabling new applications in chemical reactions.
Scientists at Brookhaven National Laboratory engineered hollow metallic nanoscale boxes, or 'nanowrappers,' to carry and release DNA-coated nanoparticles in a controlled way. The researchers demonstrated the ability to load and unload materials using these nanostructures for various applications.
A new gold recycling method has been developed using pyridinethiols and hydrogen peroxide, allowing for efficient extraction of gold from electronic waste. The process produces a stable cationic gold-containing product in organic solution, with nearly quantitative dissolution of gold after 20 minutes.
A study published in PLOS ONE found that recycling old mobile phones can recover valuable metals, such as gold and coltan, used in their construction. This reduces the incentive to mine gorilla habitats for these minerals, helping to save the species from extinction.
Researchers at FAU have developed a new method for measuring the length and diameter distribution of plasmonic gold nanorods in one single experiment. The method combines multi-wavelength absorption optics and analytical ultracentrifugation, allowing for accurate analysis of nanoparticles in dispersions.
Researchers at Empa develop high-performance watch springs through electroplating, enabling improved accuracy and long-term stability. The team's goal is to master the process of miniaturization and understand its effects on material properties.
A study by environmental engineers at Duke University found that gold nanoparticles can be dismantled by microorganisms on aquatic plants, complicating laboratory experiments. This discovery highlights the importance of considering complex ecosystems in research design to ensure accurate results.
Sandia National Laboratories engineers a platinum-gold alloy that surpasses diamond and sapphire in wear resistance, making it ideal for high-friction applications. The new alloy could save the electronics industry over $100 million annually by reducing material costs and improving durability.
Researchers from Kanazawa University developed a method for rapid, high-precision on-site analysis of precious metals in wastewaters. The technique combines Liquid-electrode plasma-optical emission spectrometry (LEP-OES) with solid-phase extraction (SPE), achieving over 95% recovery of gold, palladium, and platinum.
Researchers at Osaka University have elucidated the activation mechanism of nanoporous gold catalysts, making poisonous CO gas harmless. The study used atomic-scale resolution environmental transmission electron microscopy and computer simulations to reveal the role of residual impurities in catalyzing chemical reactions.
Researchers recorded atomic-level details of gold melting after laser heating, gaining clues for designing materials that can withstand extreme temperatures and radiation. The study's findings have potential applications in fusion power reactors, steel processing plants, and spacecraft.
Scientists at the University of Tokyo's Institute of Industrial Science have successfully created chiral nanostructures from gold particles by exploiting plasmon resonance. The method uses circularly polarized light to induce chirality in electric fields, which are then transferred to a dielectric material.
Researchers at Stanford University have discovered a new method for creating gold nanoparticles in water droplets, which could lead to more sustainable ways of producing these materials. The technique uses microdroplets as reactors and eliminates the need for potentially toxic reducing agents.
A new database charts Europe's urban mine, revealing vast quantities of scarce metals in vehicles and electrical equipment. The EU's dependence on imported metals poses a strategic and economic risk, and recycling is crucial for the transition to greener technologies.
Researchers have discovered the molecular processes that allow bacteria to extract valuable trace elements from heavy metal compounds without poisoning themselves. The process results in the formation of tiny gold nuggets.
Physicists at Mainz University have successfully manipulated the Néel vector orientation in metallic thin films of Mn2Au, a compound featuring much faster information-writing and stability. The discovery could lead to ultrafast and stable magnetic memory.
Researchers at University of Tokyo's Institute of Industrial Science report the first direct observation of gold ions moving in liquid using ADF-STEM. The study reveals heterogeneous dynamics and trapped gold ions in small spaces, which could improve battery performance and energy efficiency.
Researchers propose using titanium nitride to replace gold and silver in optoelectronic devices, offering improved anti-corrosion and thermal stability properties. The material has shown significant Q-factor improvement in plasmon resonance, enabling the preservation of energy and wave oscillations.
Researchers find evidence of gold particles in Antarctic xenoliths, tracing them to the deep mantle. The study suggests that the mantle's history and tectonic movements led to gold deposit formation.
Researchers at MIPT have conducted precise measurements of ultrathin gold films, which are key components of modern micro- and nanoscale optical and optoelectronic devices. The findings reveal that the properties of thin gold films are heavily dependent on their structure and average grain size.
Researchers discovered medieval artisans used an ancient method to coat silver threads with gold, revealing a technique that endured for centuries. The study employed lab techniques to characterize the chemistry of the threads and strips, showing the gold coating was applied using heat and hammering.
Professor Graham Hutchings' groundbreaking work on gold catalysis has led to the development of a substitute for mercury, significantly reducing environmental harm. The gold catalyst has replaced mercury in PVC production, meeting international regulations and benefiting human health.
Scientists at Johannes Gutenberg University Mainz isolate and analyze gold in the rare +II oxidation state for the first time. The stabilization of this labile ion is achieved by a porphyrin macrocycle, allowing researchers to investigate its unique properties and behavior.
In a breakthrough study, Uppsala researchers demonstrate magnetic order in a two-dimensional molecular chessboard lattice consisting of organometallic molecules. The researchers created long-range magnetic order at low temperatures through the transmission of Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions and Kondo screening.
Scientists at Ludwig-Maximilians-Universität München demonstrate that tiny spots of silver can significantly reduce energy consumption in light-based computation. By exploiting the properties of plasmon oscillations, they achieve a balance between nanometer-scale dimensions and low energy loss.
Scientists have identified 'nugget-producing' bacteria that can dissolve and re-concentrate gold in just years to decades. This breakthrough could lead to more efficient gold extraction from ore and recycled materials, as well as aid in mineral exploration for new deposits.
Researchers from Canada and GEOMAR discover fossil oil mobilized uranium, forming complex-structured gold and uranium ore. High-resolution imaging techniques reveal an intimate spatial relationship between oil products and metals.
Researchers have successfully delivered a gold catalyst to a target organ in a mouse, enabling in vivo metal-complex catalysis. This innovation paves the way for potential biomedical applications, including therapy and diagnostics.
Researchers analyzed hair samples from Tycho Brahe's remains and found significantly higher levels of gold than expected in a typical person. This suggests that Brahe was exposed to gold through his daily life, potentially through jewelry, elixirs, or alchemy.
Researchers at NIST have developed a way to build safe, nontoxic gold wires onto flexible plastic film, potentially enabling wearable health monitors. The discovery uses porous membranes with tiny holes, which keep the gold from cracking and improving conductivity.
Researchers at TU Wien have successfully created nanostructures made of pure gold using an additive direct-write lithography technique. The new method allows for the fabrication of three-dimensional gold structures, which are essential for various applications in electronics and sensor technology.
Researchers at Chalmers University of Technology have developed a new electronic 'paper' that is bendable and gives all the colors of a standard LED display. The material requires significantly less energy than a Kindle tablet, making it suitable for well-lit places such as outdoor displays.
A simple chemical method has been developed to extract gold from old mobile phones, potentially recovering up to 300 tonnes of gold per year. The new process uses a mild acid and an oily liquid containing a specific compound to selectively extract gold from other metals, eliminating the need for toxic chemicals.