Feeds

The nanotube light bulb: bright idea

First major change since Edison

  • alert
  • submit to reddit

Application security programs and practises

Chinese scientists working in collaboration with Louisiana State University have demonstrated a light bulb in with a carbon nanotube filament. As well as being the only real change in design in the last 125 years, the nano-filament bulb has several advantages over traditional tungsten.

Firstly, the researchers, lead by Tsinghua University's Jinquan Wei, found that the nano-filament emitted more light than tungsten at the same voltage. It also has a lower threshold for light emission: a mere three volts, as opposed to six for Tungsten. The bulbs still worked after being switched on and off 5000 times, and could operate at 25 volts for more than 360 hours.

The filament also behaves as a precise resistor over a wide temperature range: producing consistent resistance at up to 1750 Kelvin.

The experiment involved replacing the tungsten filament with a highly pure carbon nanotube version. The team made the tubes by chemical vapour deposition. After soaking in alcohol, the tubes self-organise into long filaments. The new filament was sealed, under vacuum, into an ordinary 40 watt bulb.

According to PhysicsWeb, the researchers say that although more work is needed, the bulbs could be commercially available in the next five years. ®

Relates stories

Boffins build room-temperature nano transistor
Europe slips behind on nano technology
DNA-based nanobot takes a stroll

Build a business case: developing custom apps

More from The Register

next story
Asteroid's DINO KILLING SPREE just bad luck – boffins
Sauricide WASN'T inevitable, reckon scientists
BEST BATTERY EVER: All lithium, all the time, plus a dash of carbon nano-stuff
We have found the Holy Grail (of batteries) - boffins
The Sun took a day off last week and made NO sunspots
Someone needs to get that lazy star cooking again before things get cold around here
Boffins discuss AI space program at hush-hush IARPA confab
IBM, MIT, plenty of others invited to fill Uncle Sam's spy toolchest, but where's Google?
Famous 'Dish' radio telescope to be emptied in budget crisis: CSIRO
Radio astronomy suffering to protect Square Kilometre Array
Bad back? Show some spine and stop popping paracetamol
Study finds common pain-killer doesn't reduce pain or shorten recovery
Forty-five years ago: FOOTPRINTS FOUND ON MOON
NASA won't be back any time soon, sadly
prev story

Whitepapers

Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
Application security programs and practises
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
How modern custom applications can spur business growth
Learn how to create, deploy and manage custom applications without consuming or expanding the need for scarce, expensive IT resources.
Securing Web Applications Made Simple and Scalable
Learn how automated security testing can provide a simple and scalable way to protect your web applications.