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From prediction to reality - a new class of bulk insulator but surface conductor material

As a result of a joint intensive work of several groups from five different countries, including Basque Country, a new wide class of topological insulators —materials that are insulators in the bulk but conductors at the surface— with technologically very promising properties has been discovered.

Topological insulators, first observed in 2007, are materials that, while being an insulator inside or in the bulk, behave as metals at the surface. Their unique properties can be used for new applications in spintronics and quantum computation as well. Physicists from Donostia International Physics Center (DIPC) and Centro de Física de Materiales (CFM) - joint center CSIC-UPV/EHU - have participated in this research project. The results have been just published in the prestigious journal Nature Communications.

The surface metallic character of these only-bulk-insulators is due to a special electronic state confined at the surface. However, to take advantage of this singular phenomenon, a tuning of this conducting state is often required. The international research team has demonstrated that most of the ordered ternary compounds (Germanium, Tin, Lead, Bismuth, Antimony, Tellurium and Selenium complexes) are actual three dimensional topological insulators showing properties distinct from those found in other binary compounds. In particular, their metallic state is buried 1-2 nm in depth, making it more stable and more protected against any surface modification, while its spin characteristics allow magnetic modifications of the material.

The existence of these exotic topological insulators was first theoretically predicted by scientists from Tomsk (Russia), Halle (Germany) and Donostia. Following this prediction, chemists from Baku (Azerbajan) grew a single crystal sample of one of those compounds. The sample was then studied by experimentalists in Zurich (Switzerland) and Hamburg (Germany), confirming all theoretical predictions.

The finding provides a promising pathway to tune both electronic and spin (that is, magnetic) properties by using different compounds and confirms the possibility to grow topological insulators with deep-laying, self-protecting and, thus, technologically relevant conducting states.

Source: http://www.basqueresearch.com/berria_irakurri.asp?Berri_Kod=3774&hizk=I

Conflict-Free Minerals Reform In The Congo: What You Can Do

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The Democratic Republic of the Congo: a region marked by violent conflict since 1996 in which torture, mass rape, forced displacement, and mass murder have been going on for years without much relief. It is a region in which armed groups are able to propagate the violence through the sale of the Congo’s mineral resources.

According to the Enough Project’s Raise Hope for Congo Campaign,

“Armed groups earn hundreds of millions of dollars per year by trading four main minerals: the ores that produce tin, tantalum, tungsten, and gold. This money enables the militias to purchase large numbers of weapons and continue their campaign of brutal violence against civilians, with some of the worst abuses occurring in mining areas.”

Most of these “conflict minerals” are used in the production of electronic devices in a process involving supply chains marked by a disturbing lack of transparency, so that by the time products such as cell phones or laptops end up in the hands of consumers, there is no way to know whether the purchase of those products contributed to the income of armed groups in the Congo.

The goals of many concerned activists are to find a way to ensure transparency in companies’ supply chains and to pressure companies found to be using conflict minerals to discontinue purchasing those minerals. The market for conflict minerals then, ideally, would be limited in terms of profit, reducing resources available to the armed groups, and thus pushing the armed groups toward peaceful resolution of the conflict which could open the region to other reforms.

There have been arguments that the initial attempts toward conflict-free policies have actually been detrimental to the Congo, by driving companies to search for minerals elsewhere, therefore crippling the economy and reducing the income of the general population. However, the UN Group of Experts recently issued a report stating that a conflict-free resolution proves to be an “important catalyst for traceability and certification initiatives and due diligence implementation in the minerals sector regionally and internationally,” and serves to reduce “the level of conflict financing provided by these minerals” in regions that have begun to comply to the due diligence guidelines. So, it seems that passing and implementing conflict-free resolutions are the first steps toward true reform and peace in the Congo.

Why not focus the fight for conflict-free reform on college campuses, which house a “particularly coveted demographic of electronics companies,” namely, students?

The Enough Project’s Raise Hope for Congo Campaign and STAND, a Student Anti-Genocide Coalition, have created the Conflict-Free Campus Initiative, a “nation-wide campaign to build the consumer voice for conflict-free electronics, such as cell phones, laptops, and other devices that will not finance war in eastern Congo.” By focusing on college campuses, the initiative “draws on the power of student leadership and activism to encourage university officials and stakeholders, both of whom are large purchasers of electronics and powerful spokespersons, to commit to measures that pressure electronics companies to take responsibility for the minerals in their supply chains.”

Organizing the student voice at the university level not only expresses the collective desire of individuals to ensure that they and their university do not participate in the perpetuation of the conflict in the Congo, but it also sends a powerful message to both political and corporate entities that consumers care about policies of those entities that may support the conflict. The Conflict-Free Campus Initiative explains:

“Universities are also a large client for most electronics companies and represent a large section of the buyers’ market for consumer electronics. By raising our collective voice as consumers, we can actually bring about a shift in corporate and government policy and help bring peace to Congo.”

Eight universities have issued conflict-free resolutions, including Stanford University, the University of Pennsylvania, and Duke University; more than sixty other colleges and universities throughout the United States and Canada have begun campaigns to do the same (including Yale University, Harvard University, Dartmouth College, Brown University, UC Davis, UCLA, UCSB, UCSC, Notre Dame, and Georgetown University).

The activism geared toward passing these conflict-free initiatives on college campuses has been successful in inspiring activity at the government level. California passed a bill prohibiting “state agencies from signing contracts with companies that fail to comply with federal regulations aimed at deterring business with armed groups in eastern Congo,” the first state bill to be passed regarding conflict minerals. Massachusetts is now also considering a conflict-free bill. Two cities, Pittsburgh, PA and St. Petersburg, FL, have also passed conflict-free resolutions.

If enough colleges, universities, towns, cities and states take the initiative in decisively acting to prevent the perpetuation of the conflict in the Congo by taking steps toward becoming conflict-free, perhaps the income of the armed groups committing mass rape and murder will be decreased sufficiently to prompt the beginnings of an end to the conflict.

Once the fighting ends, addressing the root causes of the conflict – including ethnic tensions – can be addressed through effective institutional reforms. But the fighting has to end before that can happen, and the fighting cannot end unless the actors in the conflict cannot afford to fight.

By: Cara Palmer
Source: http://www.neontommy.com/news/2012/01/conflict-free-minerals-congo-reform

Cracking Down on Conflict Minerals

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Photo: Matt Moyer/Getty Images DIRTY JOB: Men and children work at a gold mine in Mongbwalu, Democratic Republic of the Congo, in 2005. The mine is controlled by one of the many warring militias in the area. Electronics firms could face bad publicity for using gold from such mines.

In the jungles and mountains of the Democratic Republic of the Congo, battles are raging, part of a 13-year-long civil war. Most of the world has paid little attention to the murder and rape that still dominates life in the DRC’s eastern provinces. But U.S. electronics companies like HP, Intel, and Apple recently became deeply interested, thanks to a provision on “conflict minerals” that was slipped into a 2010 financial reform law, the Dodd-Frank Act.

The minerals provision is intended to deprive the Congo’s warlords of funds by cutting off sales from the mines they ­control. It focuses on the ores that ­produce the “three Ts”: tin, ­tantalum, and tungsten, as well as gold. Public companies that use these ­metals in their products will be required to investigate their supply chains, determine if they use metals that were mined in the DRC, and disclose their findings to the U.S. Securities and Exchange Commission (SEC), in their annual reports, and on their websites. If its minerals did originate in the DRC, a company must submit a larger report on whether the purchase of these minerals financed or benefited armed groups in that part of Africa. The SEC is expected to issue final rules for implementing the law before the end of the year, and companies are scrambling to get ready.

While the conflict minerals law applies only to companies that are required to file annual reports in the United States, it’s expected to have an international impact. Since mineral suppliers sell to electronics companies around the world, any change in operations they make for the U.S. market will have ripple effects elsewhere.

The law doesn’t only affect the electronics industry. But the conflict mineral issue has been linked in the public mind to ­electronics because the three Ts play ­crucial roles in smartphones, TVs, and laptops. Tin is used in solder and thus found on every circuit board, tantalum is used in capacitors, and tungsten is used in the vibrating motors of many phones.

Electronics companies had been warned that they’d eventually have to account for their use of these minerals. So firms like HP and Intel asked the Electronic Industry Citizenship Coalition (EICC) and the Global e-Sustainability Initiative, two trade groups, to investigate the industry’s options.

The groups found that it’s extremely difficult to determine the origin of the tantalum used in a certain batch of smartphones. But they also realized that only about 45 smelters worldwide deal with the three Ts, buying the ores from suppliers and turning them into pure metals. After several years of research, the industry groups came up with the Conflict-Free Smelter Program, which is currently in the pilot phase for its first metal, tantalum.

The program asks each smelter to allow an annual independent audit of its mineral procurement process. If the auditors are convinced that no minerals are sourced from the Congo’s conflict mines, that smelter is certified as “conflict free,” allowing companies to buy its metals without worry. While the program is voluntary, EICC spokeswoman Wendy Dittmer says many smelting firms believe it’s in their interest to participate.

“Electronics companies are starting to ask questions all the way down their supply chains,” she says. “That certainly makes the buyers of the minerals very interested in being able to talk about their own due diligence.”

There are concerns that the law may backfire. By making the reporting requirements more onerous for companies that source minerals from the DRC, the law may reduce demand from all DRC mines, even those that aren’t in conflict regions and don’t finance armed groups.

These concerns about such a de facto ban led Motorola Solutions to initiate the Solutions for Hope Project, in which Motorola and several other companies formed a relationship with a conflict-free tantalum mine in the DRC’s Katanga province.

To establish the program, Michael Loch, Motorola’s director of supply-chain corporate responsibility, visited the mine and accompanied a shipment of ore along its export route. “This pilot allows our industry to stay engaged in the area,” says Loch. “We didn’t want to abandon the region.” But he acknowledges that it took a lot of effort to get the process in place for one mine and says it may be difficult to scale up the program.

The pilot programs should ­provide a framework to make ­compliance easier. Still, ­companies around the world are waiting for the SEC’s final rules with some anxiety. And there may be some efforts to block the rules’ enforcement through U.S. courts. The U.S. Chamber of Commerce, for one, has discussed the possibility of a lawsuit. The chamber disagrees with the SEC’s initial compliance cost estimate of US $71 million, saying that costs will instead be counted in the billions of dollars.

One thing is already certain about the SEC rules: There will be no fines for using conflict minerals. Even so, activists think it will have its intended effect, because companies will want to avoid bad publicity.

“For years we have been unknowing consumers of these minerals because companies have turned a blind eye,” says Sasha Lezhnev, a policy consultant on conflict minerals with the human rights group Enough. “This will enable consumers to make choices on whether or not to buy products from companies that are sourcing from these mines.”

By: ELIZA STRICKLAND
Source: http://spectrum.ieee.org/semiconductors/materials/cracking-down-on-conflict-minerals

Forget oil, Indium may be the next most precious resource

by Thomas J Thompson on October 30, 2010

Indium Ingots

I will grant you that Indium finger isn’€™t a good title for a Bond movie, but Indium may certainly be worth hoarding.

Let’s start with the basics. Indium is a chemical element with chemical symbol In and atomic number 49. It is rare, very soft, malleable and is easily fusible. It is a post-transitional metal that is chemically similar to aluminum or gallium. Zinc ores are the primary source of indium and is named for the indigo blue line in its spectrum that was the first indication of its existence in ores, as a new and unknown element.

Here€™s why it’€™s important€“ today’€™s mobile touchscreen gadgets, along with all liquid crystal displays, rely on it, and it could be gone within the decade.

Indium is the principal component in indium tin oxide (ITO). ITO has unique qualities that make it unique. It is a rare example of a material that is both electrically conducting and optically transparent, which means it does not absorb photons of light. Absorption occurs when a photon’€™s energy matches that needed to knock an electron into an excited state. In a metallic conductor, where there is a free-flowing “€œsea”€ of electrons with many different energy states, his almost always happens. Accordingly, almost all metals are highly absorbing and entirely opaque. Not so ITO. It is transparent like glass, but also conducts.

ITO changed the way touchscreen works. The common methods, prior to ITO, were to use infrared LEDs ranged around the screen to fire beams that are blocked by a touch, but those were bulky and required a lot of power to run; or to use a stylus and two layers of ITO separated by a slight gap. Tapping this resistive screen with the stylus brought the two layers together, allowing a current to pass. New touchscreen devices utilize the fact that your finger is conductive to do away with the stylus. Touching the screen changes its capacitance at that location, a change picked up by a single layer of ITO.

The problem is that no one is sure how much indium there is left. The US Geological Survey estimates that known reserves of indium worldwide amount to 16,000 tons (63% in China). At the current rate of consumption, those reserves will be exhausted by 2020. Those numbers don’t take into account recycling or any new sources of indium. According to Indium Corporation, the largest processor of indium, claims that, on the basis of increasing recovery yields during extraction, recovery from a wider range of base metals (including tin, copper and other polymetallic deposits) and new mining investments, the long-term supply of indium is sustainable, reliable and sufficient to meet increasing future demands.

According to James Mitchell Crow writing in New Scientist magazine, the increasing demands for ITO promise to make ITO rare and, therefore, more expensive. The touchscreen market is currently projected at $1.47 billion and will balloon to $2.5 billion by 2017. This means that the race to find a replacement for ITO are on! Some of the replacements under consideration are zinc oxide, but it’€™s not as conductive, transparent or physically resilient as ITO. Another consideration is to stretch the current reserves of indium by mixing it with cadmium oxide. Doing so may reduce the amount of indium necessary per screen by 80%. Unfortunately, cadmium is highly toxic and prone to cracking. More futuristic thoughts include the development of conducting polymers, but these are often prone to ultraviolet light and oxygen.

So is it the end of the touchscreen era? Probably not €“ thanks to nanotechnology.

One solution may be carbon nanotubes. Carbon is a chemical chameleon. In some guises, it is the most light-absorbing material known. Pare it down to nanoscale structures, however, and it becomes transparent. Carbon nanotubes are essentially graphene sheets rolled up into tiny cylinders. Graphene, the wonder material behind the award of this year’€™s Nobel prize in physics, consists of sheets of graphite just a single atom thick. The problem is that individual nanotubes are highly conductive, but the electrons racing across their surface stop dead when they get to the end of a nanotube and have to jump to the next.

Another idea may be metal nanowires. Experiments with silver nanowires have shown transparency of 85 percent and a conductivity only a fraction behind that of ITO. Unfortunately, silver nanowires are 10 times as expensive to produce as top-grade ITO. Other concepts include a mechanical switch behind every pixel, registering the force as the screen is touched, but using pressure-sensing technology means doing away with the protective glass cover, making it more susceptible to damage. Another possibility is an optical technology that incorporates a light-detecting element into each pixel. These light sensors turn the screen into a scanner that can detect and follow a finger. However, it needs significant processing power to continually analyze the screen surface and works only a quarter as fast as a traditional laptop touchpad.

In any case, such innovations do not address the more fundamental problem that, touch or no touch, the electrodes that supply power to the pixels of LCD displays themselves depend on ITO. That will be solved only by the development of new materials that mimic ITO’€™s intensely desirable combination of transparency and conductivity.

Swiss Metal Assets appears on Deutsche Welle Television Show