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:9/14/2019)... ... September 12, 2019 , ... ... solutions for drugs, biologics, gene therapies, and consumer health products, today announced that ... biologics business. Dr. Schaffer has played an integral advisory role on the gene ...
(Date:9/8/2019)... Calif. (PRWEB) , ... September 06, 2019 , ... ... Board of Directors of Nanosens Innovations have each authorized the respective companies to ... a subsidiary of Cardea, with the Nanosens brand representing a series of products ...
(Date:8/27/2019)... ... ... Shoreline Biome , a microbiome research company that develops tools for characterizing ... and Karen Woodward as its VP of Business Development. , These two new ... expand the company’s sales worldwide. , Prior to joining Shoreline Biome, Bill McKenzie was ...
Breaking Biology News(10 mins):
(Date:9/17/2019)... ... September 17, 2019 , ... Tucker, a Labrador retriever, was just a puppy ... was limping and lame on his right hip and elbow. At one year of ... “the worst case the vet had seen.” He was prescribed pain medications, both oral ...
(Date:9/17/2019)... ... September 16, 2019 , ... MyBioGate Global ... Focus @ Biotech Week Boston, a forum organized by MyBioGate, Inc. and CUBIO ... , After a careful process of evaluation, twelve companies out of over 200 ...
(Date:9/9/2019)... ... September 09, 2019 , ... Visikol CEO Dr. Michael Johnson ... focused on how best to characterize 3D cell culture models. The inherent problem of ... too thick and opaque to image through and therefore traditional wide-field or even confocal ...
(Date:8/29/2019)... ... August 29, 2019 , ... ... affecting grapevines, a feat they hope will ultimately help protect the multibillion-dollar grape ... several Rochester Institute of Technology faculty and alumni sequenced the microbiome found within ...
Breaking Biology Technology:
Cached News: