HOME >> BIOLOGY >> NEWS
Water world: The sequel

Scientists at the Lawrence Berkeley National Laboratory (Berkeley Lab) have produced the first ever action movies starring individual water molecules on a metal surface. The ending was a surprise even to the producers.

Working with a unique scanning tunneling microscope (STM), a team led by Miquel Salmeron, a physicist with Berkeley Lab's Materials Sciences Division, cooled the surface of a single crystal of palladium, a good catalyst for reactions involving hydrogen and water, to a temperature of about 40 Kelvins(-233 degrees Celsius) in an ultrahigh vacuum. Water molecules were then introduced onto this surface and their motion was tracked with the STM. As expected from previous studies, single molecules migrated across the surface to aggregate into clusters of two (dimers), three (trimers), four (tetramers) five (pentamers) and six (hexamers). The surprise came when the scientists were able to watch the molecules as they moved.

"Isolated water molecules moved by hopping from one lattice point (on the substrate's crystal) to the nearest neighboring point whereupon if they collided with another water molecule they began to form clusters," says Salmeron. "The speed with which the molecules moved increased by four orders of magnitude when dimers were formed. The mobility of trimers and tetramers was also very high compared to the isolated molecules."

This ran contrary to the usual storyline in which single molecules diffuse or move across a surface more rapidly than clusters. Salmeron likens the situation to pulling either one skater across the ice or a group of skaters connected by a line.

"Since each skater rubs against the surface of the ice, to pull them all together means a lot of rubbing," he says. "The situation can be quite different, however, when the sliding takes place over a corrugated surface, like atoms sliding over the atomic landscape of a surface."

What he
'"/>

Contact: Lynn Yarris
lcyarris@lbl.gov
510-496-5375
DOE/Lawrence Berkeley National Laboratory
16-Sep-2002


Page: 1 2 3 4

Related biology news :

1. Water on Mars not easy to find, says Texas A&M researcher
2. Water study yields a few surprises for New England
3. Water molecules clump more loosely than previously thought
4. Ohio State wetlands professor wins prestigious Water Prize
5. Water and the Environment
6. Water treatment reduces risk of Legionnaires
7. Water quality in Adirondack lakes responding to acid rain regulations
8. From arts to neurobiology versatile Duke scientist chosen for NSF Waterman Award
9. Water lily may provide a missing link in the evolution of flowering plants
10. Water quality was issue in ancient Rome, says University of Toronto scholar
11. Water, sediments in ice-bound antarctic lakes may harbor unique microorganisms, ecosystems

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/23/2016)... 2016 Einzigartige ... und Stimmerkennung mit Passwörtern     ... MESG ), ein führender Anbieter digitaler Kommunikationsdienste, ... SpeechPro zusammenarbeitet, um erstmals dessen Biometrietechnologie einzusetzen. ... Möglichkeit angeboten, im Rahmen mobiler Apps neben ...
(Date:3/18/2016)... -- --> --> Competitive ... Unmanned Vehicles, Physical infrastructure and Perimeter Surveillance & Detection Systems ... security market and the continuing migration crisis in the ... has led visiongain to publish this unique report, which ... defence & security companies in the border security market ...
(Date:3/14/2016)... , March 14, 2016 NXTD ... growing mobile commerce market, announces the airing of a new ... starting the week of March 21 st .  The commercials ... including its popular Squawk on the Street show. --> ... on the growing mobile commerce market, announces the airing of ...
Breaking Biology News(10 mins):
(Date:5/25/2016)... ... May 25, 2016 , ... ... (RFI) issued by the Office of the National Coordinator for Health IT (ONC) ... determines if clinically relevant data were available when and where it was needed. ...
(Date:5/25/2016)... ... 25, 2016 , ... Biohaven Pharmaceutical Holding Company Ltd. (Biohaven) ... company’s orphan drug designation request covering BHV-4157 for the treatment of Spinocerebellar Ataxia ... , Spinocerebellar ataxia is a rare, debilitating neurodegenerative disorder that is estimated ...
(Date:5/24/2016)... ... 24, 2016 , ... Media Cybernetics, global image analysis leader, ... branding reflects a results-driven revitalization for a company with a renewed focus on ... a crisp, refreshed logo and a new web presence. , “I believe that ...
(Date:5/23/2016)... 23, 2016 Oxitec CEO Hadyn ... at 10:15 a.m. ET before the United States House Committee ... mosquitos can play in controlling the spread of the ... virus.      (Logo: http://photos.prnewswire.com/prnh/20150630/227348 ) ... a self-limiting gene. Trials in Brazil , ...
Breaking Biology Technology:
Cached News: