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:
TAG: Water world The sequel

(Date:8/27/2014)... of fish began exploring land and evolved into tetrapods ... ancient fish used their fishy bodies and fins in a ... scientific mysteries. , Researchers at McGill University published in ... called Polypterus , to help show what might have ... water. Polypterus is an African fish that can ...
(Date:8/27/2014)... when it only requires nerve cells to rearrange existing ... to generate new patterns, a study of monkeys has ... through recordings of electrical activity of brain cell networks. ... of Health. , "We looked into the brain and ... outside the box," said Aaron Batista, Ph.D., an assistant ...
(Date:8/27/2014)... manipulating neural circuits in the brain of mice, ... memories. The research, led by Howard Hughes Medical ... of Technology (MIT), reveals that the connections between ... information about an experience and the part of ... that experience are malleable. , Altering those ...
Breaking Biology News(10 mins):Walking fish reveal how our ancestors evolved onto land 2Scientists plug into a learning brain 2Scientists plug into a learning brain 3Researchers change the emotional association of memories 2Researchers change the emotional association of memories 3Researchers change the emotional association of memories 4
(Date:8/28/2014)... PARK, Calif. , Aug. 28, 2014 /PRNewswire/ ... focused on developing novel mid- to late-stage cardiovascular ... $7.0 million in its first round of financing. ... Biomedical Investments and Hercules Bioventures with participation from ... entrepreneur and pharmaceutical executive, Dr. Larry Hsu ...
(Date:8/28/2014)... Earlier this month, a report was created ... U.S. Air Force on the performance of vehicles using ... type of fuel made from mustard seeds, offered great ... America’s Eco friendly future. In fact, every branch of ... independent of foreign oil over the next few years. ...
(Date:8/27/2014)... 27, 2014 Varian Medical Systems today ... current Salt Lake City manufacturing facility and allow for ... to ultimately create 1,000 new full time jobs in ... “Utah is home to hardworking people with immense engineering ... with Varian’s success in the manufacturing of our state-of-the-art ...
(Date:8/27/2014)... 2014 Reportlinker.com announces that a ... its catalogue: Global Biodegradable Packaging ... http://www.reportlinker.com/p02316661/Global-Biodegradable-Packaging-Materials-Market-2014-2018.html About Biodegradable Packaging ... readily decomposed by the action of microorganisms. ... in terms of raw materials, production technology, ...
Breaking Biology Technology:Armetheon Completes $7.0 Million Series A Financing 2Armetheon Completes $7.0 Million Series A Financing 3Can Small Farmers and a New Seed Based Biofuel “Green” the World? Major Universities and Even the U.S. Air Force Seem to Think So 2Can Small Farmers and a New Seed Based Biofuel “Green” the World? Major Universities and Even the U.S. Air Force Seem to Think So 3Can Small Farmers and a New Seed Based Biofuel “Green” the World? Major Universities and Even the U.S. Air Force Seem to Think So 4Can Small Farmers and a New Seed Based Biofuel “Green” the World? Major Universities and Even the U.S. Air Force Seem to Think So 5Varian Medical Systems Groundbreaking on Facility Expansion Triggers Influx of New Jobs to Salt Lake 2Varian Medical Systems Groundbreaking on Facility Expansion Triggers Influx of New Jobs to Salt Lake 3Global Biodegradable Packaging Materials Market 2014-2018 2Global Biodegradable Packaging Materials Market 2014-2018 3Global Biodegradable Packaging Materials Market 2014-2018 4Global Biodegradable Packaging Materials Market 2014-2018 5Global Biodegradable Packaging Materials Market 2014-2018 6Global Biodegradable Packaging Materials Market 2014-2018 7
Cached News: