Featured Research

from universities, journals, and other organizations

Light In Liquids Can Be Regulated Electrically

Date:
June 16, 1999
Source:
Netherlands Organization For Scientific Research
Summary:
Chemists from Utrecht University and Philips Research have been able to regulate the flow of light through a liquid by means of an electrical field. As part of a project funded by the NWO’s Foundation for Fundamental Research on Matter (FOM), they developed a liquid containing metal "nano-rods". A liquid of this type can be used in electrical sun screens, for example in a car window, with the light transmission being adjusted by means of a knob.

Chemists from Utrecht University and Philips Research have been able to regulate the flow of light through a liquid by means of an electrical field. As part of a project funded by the NWO’s Foundation for Fundamental Research on Matter (FOM), they developed a liquid containing metal "nano-rods". A liquid of this type can be used in electrical sun screens, for example in a car window, with the light transmission being adjusted by means of a knob.

The ability of the liquid to screen out the sun is based on the tiny metal rods it contains, which move at random in suspension. The rods have a diameter which can be altered from 12 to 22 nanometres and an adjustable length of between 40 and 730 nanometres. They absorb light of a certain colour, and the electrons resonate with the light over the length of the rod. The colour of the light absorbed depends on the length of the rods. If all the rods are oriented in the same direction, the liquid hardly absorbs any light at all.

The orientation of the rods can be adjusted by means of an electrical field which causes the transport of a charge in the rods. This means that the mid-point of the positive charge no longer coincides with that of the negative charge, so that the rods are subject to a force which causes them to orient themselves in the direction of the electrical field. The chemists found that the strength of the field required to orient the rods in an alternating field is dependent on their length.

The phenomenon of light absorption by nano-rods was already known in the 1930s. However, there had up to now been hardly any systematic research, because it proved to be a difficult matter to produce a liquid in which all the rods are of equal size and do not coagulate. To produce such a liquid, the Dutch chemists filled a finely perforated mould with gold. They then dissolved the membrane of the mould so that the rods remained behind on the base. These were then transferred to water by means of ultrasonic vibration. A special anticoagulant ensured that the gold rods did not form aggregates.


Story Source:

The above story is based on materials provided by Netherlands Organization For Scientific Research. Note: Materials may be edited for content and length.


Cite This Page:

Netherlands Organization For Scientific Research. "Light In Liquids Can Be Regulated Electrically." ScienceDaily. ScienceDaily, 16 June 1999. <www.sciencedaily.com/releases/1999/06/990616063542.htm>.
Netherlands Organization For Scientific Research. (1999, June 16). Light In Liquids Can Be Regulated Electrically. ScienceDaily. Retrieved September 18, 2014 from www.sciencedaily.com/releases/1999/06/990616063542.htm
Netherlands Organization For Scientific Research. "Light In Liquids Can Be Regulated Electrically." ScienceDaily. www.sciencedaily.com/releases/1999/06/990616063542.htm (accessed September 18, 2014).

Share This



More Matter & Energy News

Thursday, September 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Virtual Reality Headsets Unveiled at Tokyo Game Show

Virtual Reality Headsets Unveiled at Tokyo Game Show

AFP (Sep. 18, 2014) Several companies unveiled virtual reality headsets at the Tokyo Game Show, Asia's largest digital entertainment exhibition. Duration: 00:48 Video provided by AFP
Powered by NewsLook.com
Stocks Hit All-Time High as Fed Holds Steady

Stocks Hit All-Time High as Fed Holds Steady

AP (Sep. 17, 2014) The Federal Reserve signaled Wednesday that it plans to keep a key interest rate at a record low because a broad range of U.S. economic measures remain subpar. Stocks hit an all-time high on the news. (Sept. 17) Video provided by AP
Powered by NewsLook.com
Space Race Pits Bezos Vs Musk

Space Race Pits Bezos Vs Musk

Reuters - Business Video Online (Sep. 16, 2014) Amazon CEO Jeff Bezos' startup will team up with Boeing and Lockheed to develop rocket engines as Elon Musk races to have his rockets certified. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
MIT's Robot Cheetah Unleashed — Can Now Run, Jump Freely

MIT's Robot Cheetah Unleashed — Can Now Run, Jump Freely

Newsy (Sep. 16, 2014) MIT developed a robot modeled after a cheetah. It can run up to speeds of 10 mph, though researchers estimate it will eventually reach 30 mph. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins