Featured Research

from universities, journals, and other organizations

Detecting cesium with naked eyes

Date:
March 11, 2013
Source:
International Center for Materials Nanoarchitectonics (MANA)
Summary:
Micrometer-level naked-eye detection of cesium ions, a major source of contamination in the vicinity of radioactive leaks, is demonstrated in a material developed by researchers in Japan.

Photographs of fluorescence changes of a mixture of the phenol compound and various carbonate salts after addition of a drop of methanol. (a) Fluorescence change of a powdered mixture of the compound and Cs2CO3 under UV irradiation (365 nm) after addition of a drop of methanol. (b) Photographs of a mixture of the compound and various carbonate salts of other metals under UV irradiation (365 nm) after addition of a drop of methanol. (c) Photographs of the compound with caesium cations on dirt under room light (left) and under UV irradiation (365 nm, right) after spraying with methanol. (d) Photographs of the compound with caesiumcation particles on filter paper (diameter 110 mm) under UV irradiation (365 nm) after spraying with methanol.
Credit: Image courtesy of International Center for Materials Nanoarchitectonics (MANA)

Micrometer-level naked-eye detection of cesium ions, a major source of contamination in the vicinity of radioactive leaks, is demonstrated in a material developed by researchers in Japan.

Radioactive cesium 137 has a half-life of 30.17 years, and its accumulation in organisms in exposed regions, such as around the Fukushima Daiichi nuclear plant, amplifies the hazard it poses. A new material reported by researchers in Japan may help.

"We have developed molecular materials as an optical probe for cesium cation-containing particles with implementation based on simple spray-on reagents and a commonly available fluorescent lamp for naked-eye detection in the solid state," explain Jonathan P Hill, Katsuhiko Ariga and colleagues at the WPI-International Center for Materials Nanoarchitectonics, Tokyo University and the Japan Science and Technology Agency (JST).

The researchers based the probe on changes in the fluorescence of organic compounds called phenols in the presence of alkali metals. They designed a substituted phenol compound with an electron-accepting 4-nitrophenyl ether (4-NPE) group. The compound showed a distinctive green fluorescence in the presence of cesium cations and methanol. In comparison, other alkali metals gave rise to dimmer blue fluorescence.

The researchers noted that the fluorescence peak shifted with increasing cesium concentration so that the probe could be calibrated. The probe was sensitive to cesium concentrations of 1 part per million. This is the concentration naturally occurring in the Earth's crust meaning excess to the norm can be detected.

Alongside molecular dynamics calculations these observations suggested the mechanism behind the fluorescent behavior, for which the geometry of the compound molecules and interactions between different constituents seem key.

As the authors suggest, "The availability of this and other similarly easily implemented tests for environmental contaminants is likely to increase the volume of data regarding rates of contamination around chemical and radiological hazards."


Story Source:

The above story is based on materials provided by International Center for Materials Nanoarchitectonics (MANA). Note: Materials may be edited for content and length.


Journal Reference:

  1. Taizo Mori, Masaaki Akamatsu, Ken Okamoto, Masato Sumita, Yoshitaka Tateyama, Hideki Sakai, Jonathan P Hill, Masahiko Abe, Katsuhiko Ariga. Micrometer-level naked-eye detection of caesium particulates in the solid state. Science and Technology of Advanced Materials, 2013; 14 (1): 015002 DOI: 10.1088/1468-6996/14/1/015002

Cite This Page:

International Center for Materials Nanoarchitectonics (MANA). "Detecting cesium with naked eyes." ScienceDaily. ScienceDaily, 11 March 2013. <www.sciencedaily.com/releases/2013/03/130311090852.htm>.
International Center for Materials Nanoarchitectonics (MANA). (2013, March 11). Detecting cesium with naked eyes. ScienceDaily. Retrieved July 22, 2014 from www.sciencedaily.com/releases/2013/03/130311090852.htm
International Center for Materials Nanoarchitectonics (MANA). "Detecting cesium with naked eyes." ScienceDaily. www.sciencedaily.com/releases/2013/03/130311090852.htm (accessed July 22, 2014).

Share This




More Matter & Energy News

Tuesday, July 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Government Approves East Coast Oil Exploration

Government Approves East Coast Oil Exploration

AP (July 18, 2014) The Obama administration approved the use of sonic cannons to discover deposits under the ocean floor by shooting sound waves 100 times louder than a jet engine through waters shared by endangered whales and turtles. (July 18) Video provided by AP
Powered by NewsLook.com
Sunken German U-Boat Clearly Visible For First Time

Sunken German U-Boat Clearly Visible For First Time

Newsy (July 18, 2014) The wreckage of the German submarine U-166 has become clearly visible for the first time since it was discovered in 2001. Video provided by Newsy
Powered by NewsLook.com
Obama: U.S. Must Have "smartest Airports, Best Power Grid"

Obama: U.S. Must Have "smartest Airports, Best Power Grid"

Reuters - US Online Video (July 17, 2014) President Barak Obama stopped by at a lunch counter in Delaware before making remarks about boosting the nation's infrastructure. Mana Rabiee reports. Video provided by Reuters
Powered by NewsLook.com
Crude Oil Prices Bounce Back After Falling Below $100 a Barrel

Crude Oil Prices Bounce Back After Falling Below $100 a Barrel

TheStreet (July 16, 2014) Oil Futures are bouncing back after tumbling below $100 a barrel for the first time since May yesterday. Jeff Grossman is the president of BRG Brokerage and trades at the NYMEX. Grossman tells TheStreet the Middle East is always a concern for oil traders. Oil prices were pushed down in recent weeks on Libya increasing its production. Supply disruptions in Iraq fading also contributed to prices falling. News from China's economic front showing a growth for the second quarter also calmed fears on its slowdown. Jeff Grossman talks to TheStreet's Susannah Lee on this and more on the Energy Department's Energy Information Administration (EIA) report. Video provided by TheStreet
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