Researchers are looking for the super battery(B)

Posted by admin on Sep 3rd, 2010 | 0 comments

Researchers are looking for the super battery(B)

A key problem is to concentrate as much as electrical energy in the smallest space. Researchers at the Fraunhofer Institute for Chemical Technology (ICT) in Pfinztal near Karlsruhe, therefore, attempt to replace conventional graphite electrodes from a1185 battery with materials from tiny, only a few hundred nanometers thick carbon tubes and fibers. This would dramatically increase the inner electrode surface. Normally, lithium ions move only between the graphite layers of the host lattice. A task that is called intercalation. The Nanokohlenstoff from Pfinztal is also different here: “If nanotubes are deposited lithium-ion addition to the edges and surfaces of material layers. Nanotubes can also be manufactured so that a much larger proportion of occupied Interkalationsschichten of lithium-ion battery ,” says Jens Tübke head of ICT at the Department of Applied Electrochemistry.

Meanwhile, the researchers were able to increase the discharge capacity of nano-batteries to about 800 milliampere hours per gram (mAh/g). Classical graphite vgp-bps5 battery provide only 300 mAh / g. Nor is the production of micro-carbon nanotubes-consuming and expensive.

Ten times more lithium ions per gram of silicon can store as an electrode material in comparison to graphite. To the chagrin of the researchers, however, increased fourfold while the original volume of the brittle semiconductor materials. The result: After a few charge cycles to show cracks. Here, too nanostructures to solve the problem. For example, researchers at Stanford University are experimenting with micro-fine silicon tube as an electrode material of battery . In the nanofibers mechanical stresses during loading and unloading can survive obviously much better than normal silicon crystals. In addition, the mini-tubes can be produced with the chip production process from relatively inexpensive.

In the laboratories of Stefan Koller, Institute of Chemical Technology of Materials at the Technical University of Graz are also lithium-ion inspiron 1520 batterytested with silicon electrodes. The Austrian researchers battery is however a containing silicon gel which is deposited on graphite as a substrate material. “It has graphite as a buffer to absorb the large volume changes of silicon in the ion absorption and emission,” said Koller. The new material could thus save an unchanged lifetime, more than double the amount of lithium ions. Challenge, however, remains the poor density of the materials in the electrode.

High-performance battery  should base on lithium-ion plating,and are used for electric vehicles such as energy, the relatively long time to load the batteries can quickly be the Achilles heel of the technique. Until now, battery experts have always assumed that lithium ions during charging is not fast enough to move through the respective electrode material. A computer simulation, carried out the Gerbrand Ceder, Massachusetts Institute of Technology (MIT) in Cambridge (USA), but then placed near the opposite: the example of the standard material lithium iron phosphate (LiFePO (-4)) showed cedar that lithium-ion moving within the electrode downright brisk. But they are thwarted by the limited number of access channels in the crystal lattice, which are also difficult to reach. The result is a jam of the charge carriers.

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The Science and Technology of Carbon Nanotubes

Posted by admin on Aug 30th, 2010 | 1 comment

The Science and Technology of Carbon Nanotubes

Carbon Nanotubes (CNT) is the material lying between fullerenes and graphite as a new member of carbon allotropes. The study of CNT has gradually become more and more independent from that of fullerenes. As a novel carbon material, CNTs will be far more useful and important than fullerenes from a practical point of view, in that they will be directly related to an ample field of nanotechnology. This book presents a timely, second-generation monograph covering as far as practical, application of

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New Lithium Batteries Could Last 10 Times Longer

Posted by admin on Aug 29th, 2010 | 0 comments

New Lithium Batteries Could Last 10 Times Longer

The most consistent complaint I ever hear (or make) about smart phones is they eat up power like a fat kid eats candy. But a new development in how to manufacture rechargeable batteries for portable electronics could allow batteries to hold ten times more power than they do now.

Researchers at MIT found that using carbon nanotubes for one of the battery’s electrodes hold much more energy than the current breed of lithium-ion batteries. The experimental batteries use layered carbon nanotubes as the positive electrode and a lithium titanium oxide as the negative electrode. The batteries deliver power at the high-speed rates of capacitors while being able to store more energy than even the best lithium-ion batteries available today.

The carbon nanotube electrodes also proved their longevity. After 1,000 cycles of charging and discharging a test battery, there was no detectable change in the material’s performance.

That’s good news for anyone with an electric device that runs on batteries, your humble blogger included. I have to charge my Android phone each night just to get through the next day. If these batteries come to market, my little Droid Eris could last for days without a charge.

But that’s still a big if. The electrode material was produced by dipping a substrate into two different solutions, a pretty time-consuming process. One of the researchers leading the project, MIT professor of chemical engineering, Paula Hammond, says her team may have a solution. Hammond suggests that the process could be modified by spraying the alternate layers onto a moving ribbon of material, a technique now being developed in her lab.

Until then, I’m stuck charging my smart phone every night.

Australia largest laptop battery and laptop adapter supplier provide cheap laptop batteries: dell U4873 battery, dell latitude d610 battery, dell inspiron 6400 battery and so on.

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Researchers are looking for the super battery(B)

Posted by admin on Aug 27th, 2010 | 0 comments

Researchers are looking for the super battery(B)

A key problem is to concentrate as much as electrical energy in the smallest space. Researchers at the Fraunhofer Institute for Chemical Technology (ICT) in Pfinztal near Karlsruhe, therefore, attempt to replace conventional graphite electrodes with materials from tiny, only a few hundred nanometers thick carbon tubes and fibers. This would dramatically increase the inner electrode surface. Normally, lithium ions move only between the graphite layers of the host lattice. A task that is called intercalation. The Nanokohlenstoff from Pfinztal is also different here: “If nanotubes are deposited lithium-ion addition to the edges and surfaces of material layers. Nanotubes can also be manufactured so that a much larger proportion of occupied Interkalationsschichten of lithium-ion inspiron e1505 battery ,” says Jens Tübke head of ICT at the Department of Applied Electrochemistry.

Meanwhile, the researchers were able to increase the discharge capacity of nano-batteries to about 800 milliampere hours per gram (mAh/g). Classical graphite battery provide only 300 mAh / g. Nor is the production of micro-carbon nanotubes-consuming and expensive.

Ten times more lithium ions per gram of silicon can store as an electrode material in comparison to graphite. To the chagrin of the researchers, however, increased fourfold while the original volume of the brittle semiconductor materials. The result: After a few charge cycles to show cracks. Here, too nanostructures to solve the problem. For example, researchers at Stanford University are experimenting with micro-fine silicon tube as an electrode material . In the nanofibers mechanical stresses during loading and unloading can survive obviously much better than normal silicon crystals. In addition, the mini-tubes can be produced with the chip production process from relatively inexpensive.

In the laboratories of Stefan Koller, Institute of Chemical Technology of Materials at the Technical University of Graz are also lithium-ion inspiron 1520 batterytested with silicon electrodes. The Austrian researchers battery is however a containing silicon gel which is deposited on graphite as a substrate material. “It has graphite as a buffer to absorb the large volume changes of silicon in the ion absorption and emission,” said Koller. The new material could thus save an unchanged lifetime, more than double the amount of lithium ions. Challenge, however, remains the poor density of the materials in the electrode.

High-performance battery should base on lithium-ion plating,and are used for electric vehicles such as energy, the relatively long time to load the batteries can quickly be the Achilles heel of the technique. Until now, battery experts have always assumed that lithium ions during charging is not fast enough to move through the respective electrode material. A computer simulation, carried out the Gerbrand Ceder, Massachusetts Institute of Technology (MIT) in Cambridge (USA), but then placed near the opposite: the example of the standard material lithium iron phosphate (LiFePO (-4)) showed cedar that lithium-ion moving within the electrode downright brisk. But they are thwarted by the limited number of access channels in the crystal lattice, which are also difficult to reach. The result is a jam of the charge carriers.

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Man Advancing Ahead With Buckyballs

Posted by admin on Aug 25th, 2010 | 0 comments

Man Advancing Ahead With Buckyballs

Buckyballs are a form of elemental carbon in recent discoveries. Due to the nature of its arrangement, atom clusters form a structure which closely resembles a soccer ball, complete with facets. In trying to name it, the scientists decided to pay homage to a famous architect who used to design structures which struck a close resemblance to this carbon form.

What are buckyballs used for in this day and age? One of its most common uses is in the nanotube technology. By its name, you can guess that this is technology dealing with very minute measurements. This technology demonstrates unique capabilities in terms of high electrical and thermal conductivity. Since the atoms are tightly knitted together and separated by a hair’s breadth in nano terms, they possess great strength. Due to the many facets surrounding each nanotube, it has a very high surface area. With all these combined properties, these carbon nanotubes emerge as the next best alternatives to super and semi-conductors as well as full conductors such as metals.

In further studies regarding our planet’s history, its biological and geological elements can be explored through the use of buckyballs as every life form stems from carbon. Due to an internal hollow sphere within each buckyball, gases or other elements trapped within gives cause to study what the planet was like eons back. Studies have also extended beyond the planet into discovered meteorites and carbon properties they hold within.

In a more practical sense, what are buckyballs used for? Research work has gone into using these buckyballs in the medical field. , As mentioned earlier, buckyballs have these elements have a strong structure. As such, certain drugs can be attached to them. These buckyballs function as drug carriers and are then administered into patients as part of a drug treatment procedure for specific diseases. These elements are also used in medical diagnostics. By introducing certain contrast indicators to be stored within the hollow void of buckyballs, they are then administered into patients. Due to the same principle of structural integrity, hazards of using these contrast materials are supposedly reduced as they are encased within the strong walls of the buckyballs. Significant advancements of buckyballs in the medical field are certainly worth the investment in research work.

By combining these carbon elements with other chemical components, it is formed into a thin film. When placed on a flat surface, it demonstrates wondrous capability in transmitting light thus making it an excellent option in fiber optics development. Due to their spherical shape, these carbon wonders perform the equivalent of ball bearings. This implies their use in the area of lubrication as the conventional oils and greases may still pose some amount of friction.

An international team of researchers have captured a video of the reactions of dysprosium atoms trapped inside fullerene cages encased in a carbon nanotubes. The Dy+ ions (black blobs) move around inside the fullerene cages and eventually meld them all together into a coherent tube. The tube is then severed by further reaction with the metal ions. Read more at chemistry world here (www.chemistryworld.org) and see the full paper in Angewandte Chemie http
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