[ bigvlada @ 20.06.2010. 08:40 ] @
Researchers Develop First Paper Supercapacitor
by Ariel Schwartz, 05/21/10



In the near future, we might have electronic devices made entirely out of paper–with paper displays, paper transistors, and even paper supercapacitors. Researchers at Stanford University have developed the first paper supercapacitor by printing carbon nanotubes onto paper. Similar paper supercapacitors can be printed on everything from grocery ads to Xerox paper.



Stanford researchers developed the supercapacitor by coating both sides of a piece of paper with polyvinylidene fluoride (PVDF), causing it to function as an electrolyte separator and membrane. The treated paper allows the supercapacitor, made entirely out of single walled carbon nanotubes (SWNTs), to bond to the paper — much like ink from a pen bonds to paper. It works well, too — the device loses minimal capacitance after 2500 charge-discharge cycles.

Most importantly, the development of paper supercapacitors could usher in an era where we can simply toss small electronic devices in the recycling bin when we’re done with them–no need to hunt for electronics recycling centers. Because the easier it is to recycle, the less likely it is that electronics will end up in our landfills.

Izvor: Inhabitat
http://inhabitat.com/2010/05/2...op-first-paper-supercapacitor/
[ Nemanjich @ 21.06.2010. 09:31 ] @
Evo samo da kazem, posto se ovde spominju karbonske nanotube, da nam je profesor rekao, koji je inace strucnjak iz kvantne i nano elektronike, da on licno, a zna jos dosta ljudi koji ocekuju da se nobelova nagrada iz fizike dodeli bas iz oblasti karbonskih nanotuba.
[ bigvlada @ 28.08.2010. 16:58 ] @
LG to Make E-paper for New Generation of Devices

LG Display says it is developing a new generation of color and flexible e-paper that may go into future products such as e-readers or tablets.

The company expects to begin mass producing 9.7-inch color and 19-inch flexible e-paper, according to an SEC filing it made on Friday. E-paper, or electronic paper, is a display used in e-readers on which text appears as it would on printed paper.

LG introduced the 9.7-inch IPS LCD screen used in Apple's iPad, and remains a main display supplier for the tablet. LG also is one of the suppliers of the 9.7-inch e-paper display Amazon uses in its Kindle DX e-reader.

It is hard to predict LG's direction, but the 9.7-inch color e-paper may go into future generations of e-readers like Kindle or even multimedia devices like tablets, if they fit the size and profile, said Vinita Jakhanwal, director of small and medium-sized displays at market research firm iSuppli.

Many e-readers use monochrome screens based on technology from E-Ink, but LG has been independently researching development of color e-paper, Jakhanwal said. LG in the past showed flexible color e-paper displays, including a 14-inch A4-sized e-paper that could display 16.7 million colors.

"What device it'll be used in will be interesting," Jakhanwal said.

Analysts agreed that color e-paper could bring a new level of multimedia entertainment to e-readers and portable devices. But there are cost and usage issues that need to be overcome before they become popular.

Color e-paper could be more expensive and consume a lot of power, said Lawrence Gasman, principal analyst at NanoMarkets.

Users like the Kindle because it can be left on for long stretches of time without depleting the battery. Color e-paper may not only reduce battery life, but also increase the price of the device. Existing e-paper displays do not require backlights like traditional LCD screens, which make them power efficient.

"If they've got decent color and give reasonable battery life, that's pretty good news," Gasman said.

LG also has a large distribution channel, so it has the capability to push the new screens to device makers, Gasman said.

But color e-paper remains unproven, and analysts said it is not yet ready to replace traditional LCD screens. E-Ink is developing color e-paper technology and has already displayed prototypes, but the results were underwhelming, analysts said.

E-Ink will announce color e-paper plans and availability at the end of this year, a company spokesman said.

There are also some other e-paper technologies apart from E-Ink like electrowetting that can produce fairly deep colors, but the displays are expensive and consume more power, Gasman said.

LG also said it may start manufacturing flexible 19-inch monochrome e-paper. LG could use that for new e-reading devices the size of traditional newspapers, iSuppli's Jakhanwal said.

The e-paper has already been shown in devices at trade shows, Jakhanwal said, adding that she saw the e-paper encased in steel, with a glass panel at front.

"It's more to reflect the size of a newspaper," Jakhanwal said. "It's high time they put something out."

Flexible displays have been out for a while, analysts said. For example, the Kindle's front panel has a flexible substrate, but electronics on the back panel to manage pixels on the screen cannot be flexed. Most of these flexible displays are encased in steel.

A company called Plastic Logic had plans to release an e-reader called Que with a flexible substrate and organic transistors. However, the company cancelled the product this month, and said it was redirecting its focus on its next-generation e-reader.

Izvor:PC world
http://www.pcworld.com/article...new_generation_of_devices.html

navodno, ovako bi trebalo da izgleda


Koliko je realno da u sledećih pet godina dnevne novine kupujemo samo jednom nedeljno a dopune dobijemo preko bežične mreže?
[ Horvat @ 12.09.2010. 21:53 ] @
a di je tu baterija?
[ bigvlada @ 04.10.2010. 09:11 ] @
Electrochemistry: Paper Li-ion Batteries Offer Flexible Power Options
Mitch Jacoby

October 4, 2010



Ultrathin rechargeable lithium-ion batteries have been fabricated on a single sheet of paper, resulting in highly flexible and lightweight portable power sources, according to a study published in ACS Nano by Stanford University researchers (DOI: 10.1021/nn1018158). The advance may provide an integrated power solution for the developing field of paper-based electronics and lead to applications in “smart” packaging and radio-frequency sensing.

To make the batteries, Stanford materials scientists Liangbing Hu, Hui Wu, Yi Cui, and coworkers coated a solid support with a thin film of carbon nanotubes and deposited a film of a metal-containing lithium compound on top of the nanotubes. Then the team deposited the double-layer films on both sides of ordinary paper. In that design, the lithium layers function as battery electrodes and the nanotube films serve as current collectors. The paper is the electrode separator and also serves as a mechanical support.

The new batteries, which are just 300 μm thick, are thinner and more flexible, and they exhibit higher energy density and other electrical advantages, compared with other types of thin batteries, the scientists say. They add that battery performance did not degrade over the course of a 300-cycle recharging test.

Juxtaposing carbon nanotubes and lithium compounds with paper has enabled the team to optimize the device in an ultrathin architecture, says Rice University’s Pulickel M. Ajayan. “Such simple fabrication techniques could prove useful for integrating other nanomaterials for building the next generation of energy-storage devices,” he says.
Chemical & Engineering News
ISSN 0009-2347
Copyright © 2010 American Chemical Society

http://pubs.acs.org/cen/news/88/i38/8838notw7.html
[ bigvlada @ 04.10.2010. 09:22 ] @
Nano Ink Allows Simple Office Paper to Conduct Electricity
by Bridgette Meinhold, 09/30/10 filed under: Green Materials, green technology



Decker Yeadon is back at it, inventing incredible materials with architectural applications. This time they’ve made simple office paper capable of conducting electricity with ink made out of nanoparticles. Their amazing discovery, which also works with cotton fabric, has the potential to revolutionize buildings, design, textiles and medical applications. The design firm recently demonstrated how they could power an LED bulb with a mere strip of the conductive office paper.



The New York design firm is known for coming up with innovative and novel applications for advanced materials, including nano materials and even architectural Buckypaper. For their latest project, they made a nano solution that they’re calling NanoINK, which consists of carbon nanotubes, deionized water, and a chemical surfactant that helps the nanotubes disperse in the water. The nanotubes are only 1.5 nm in diameter, which is smaller than a DNA molecule.

Then the ink was applied to a number of different surfaces, including regular office paper (Decker Yeadon letterhead), cotton fabric and cotton pads, resulting in the areas with ink having electrical properties. First they tested each material with a voltage meter to see if the paper or cotton was conductive, which the video clearly shows to be the case. Afterwards the tester also showed how a single strip of office paper coated in the NanoInk could conduct electricity from batteries to power an LED light.

Decker Yeadon’s discovery could have a wide range of applications from architecture to electronics, textiles, even medicine. If the ink could be controlled properly, it could even be applied by printers in a specific pattern to yield exact and predetermine electrical circuits.



http://inhabitat.com/2010/09/3...nduct-electricity/#more-167874