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 22, 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 22, 2014).

Share This



More Matter & Energy News

Monday, September 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Thousands March in NYC Over Climate Change

Thousands March in NYC Over Climate Change

AP (Sep. 21, 2014) — Accompanied by drumbeats, wearing costumes and carrying signs, thousands of demonstrators filled the streets of Manhattan and other cities around the world on Sunday to urge policy makers to take action on climate change. (Sept. 21) Video provided by AP
Powered by NewsLook.com
What This MIT Sensor Could Mean For The Future Of Robotics

What This MIT Sensor Could Mean For The Future Of Robotics

Newsy (Sep. 20, 2014) — MIT researchers developed a light-based sensor that gives robots 100 times the sensitivity of a human finger, allowing for "unprecedented dexterity." Video provided by Newsy
Powered by NewsLook.com
MIT BioSuit A New Take On Traditional Spacesuits

MIT BioSuit A New Take On Traditional Spacesuits

Newsy (Sep. 19, 2014) — The MIT BioSuit could be an alternative to big, bulky traditional spacesuits, but the concept needs some work. Video provided by Newsy
Powered by NewsLook.com
New Music With Recycled Instruments at Colombia Fest

New Music With Recycled Instruments at Colombia Fest

AFP (Sep. 19, 2014) — Jars, bottles, caps and even a pizza box, recovered from the trash, were the elements used by four musical groups at the "RSFEST2014 Sonorities Recycling Festival", in Colombian city of Cali. Duration: 00:49 Video provided by AFP
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