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:1/18/2017)... Jan. 18, 2017  In vitro diagnostic (IVD) companies ... and acquisitions (M&A), and Kalorama Information expects that trend ... have been shifting. Generally, uncertainty in reimbursement and healthcare ... U.S. has changed the acquisitions landscape. Instead of looking ... companies buying partners outside of their home country and ...
(Date:1/13/2017)... 13, 2017 Sandata Technologies, LLC, a ... homecare industry, including Electronic Visit Verification™ (EVV™), announced ... Jugs, as Senior Vice President of Product Management. ... of homecare experience to Sandata, where he will ... to align Sandata,s suite of solutions with the ...
(Date:1/12/2017)...  New research undertaken by Fit Small Business ... participants were simply asked which office technology had they not ... standard issue.  Insights on what will be key ... futurists and industry leaders including Penelope Trunk , ... Some of these findings included; ...
Breaking Biology News(10 mins):
(Date:2/17/2017)... , February 17, 2017 ... Market by Product (Consumables, Service), Type (Safety, Efficacy, ... Development, Drug Discovery and Development, Disease-Risk) - Global ... is projected to reach USD 53.34 Billion by ... at a CAGR of 13.8% during the forecast ...
(Date:2/16/2017)... ... February 16, 2017 , ... EIT Digital has launched work to ... industry. Pilot studies are about to get under way for the framework, which is ... innovations. The concept is expected to be transferred eventually to other industries that also ...
(Date:2/16/2017)... 16, 2017  ArmaGen, Inc., a privately held ... treat severe neurological disorders, today reported preliminary evidence ... the company,s investigational therapy for the treatment of ... type I, or MPS I). The initial results ... presented today at the 13 th annual ...
(Date:2/16/2017)... 16, 2017 UCHealth ( Aurora, Colorado ... for pulmonary nodule patient management. In addition to optimizing ... spot on the lung, UCHealth looks to improve provider ... entry. Stephanie Brown, RN , Thoracic ... patients with an Excel spreadsheet, which was extremely arduous ...
Breaking Biology Technology:
Cached News: