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:6/15/2016)... 2016 Transparency Market Research ... Market by Application Market - Global Industry Analysis Size Share ... the report, the  global gesture recognition market  was ... is estimated to grow at a CAGR of ... Increasing application of gesture recognition technology ...
(Date:6/9/2016)... Paris Police Prefecture and ... ensure the safety of people and operations in several locations ... Teleste, an international technology group specialised in broadband ... its video security solution will be utilised by ... across the country. The system roll-out is scheduled for the ...
(Date:6/3/2016)... 3, 2016 Das ... Nepal hat ein 44 ... geprägter Kennzeichen, einschließlich Personalisierung, Registrierung und IT-Infrastruktur, ... Produktion und Implementierung von Identitätsmanagementlösungen. Zahlreiche renommierte ... Januar teilgenommen, aber Decatur wurde als konformste ...
Breaking Biology News(10 mins):
(Date:12/4/2016)... ... December 03, 2016 , ... Microbial genomics leader uBiome is ... has been made to Dr. Renato Polimanti of Yale University School of Medicine, ... microbiome. Grant proposals have been vetted by the company’s scientific review committee. ...
(Date:12/2/2016)... ... December 02, 2016 , ... In ... cervical and lumbar disc production, company President, Jake Lubinski will be traveling to ... the AxioMed disc in Bern, Lucerne, and Zurich to discuss the benefits of ...
(Date:12/2/2016)... Dec. 2, 2016 Amgen (NASDAQ: AMGN ... announced the submission of a Marketing Authorization Application (MAA) to ... candidate to Avastin ® (bevacizumab). The companies believe this ... EMA. "The submission of ABP 215 to ... expand our oncology portfolio," said Sean E. Harper , ...
(Date:12/2/2016)... , ... December 01, 2016 , ... ACEA Biosciences, Inc. ... Phase I/II clinical trials for AC0010 at the World Conference on Lung Cancer 2016, ... an update on the phase I/II clinical trials for AC0010 in patients with advanced ...
Breaking Biology Technology:
Cached News: