Navigation Links
It's raining pentagons
Date:3/8/2009

This week's Nature Materials (09 March 2009) reveals how an international team of scientists led by researchers at the London Centre for Nanotechnology (LCN) at UCL have discovered a novel one dimensional ice chain structure built from pentagons that may prove to be a step toward the development of new materials which can be used to seed clouds and cause rain.

Although the structure of regular ice is well known at the macroscale, its structures are much more mysterious and less well understood at the nanoscale - particularly when ice forms at an interface with matter as is the case in the higher atmosphere on particles of dust. "For the first time, we have shown that ice can build an extended one dimensional chain structure entirely from pentagons and not hexagons" says Dr Michaelides. "This discovery leads to fundamental new understanding about the nature of hydrogen bonding at interfaces (there is no a priori rule that hexagons should form) and suggests that when people are searching for new ice nucleating agents which can be used to seed clouds and cause rain, they do not necessarily need to focus on materials that have hexagonal surfaces - other types of surfaces may be good too."

Ice structures are usually built out of simple hexagonal arrangements of water molecules and this hexagonal building block motif is easily observed in the structures of snowflakes. However, during their studies Dr Angelos Michaelides and co-workers from the Fritz Haber Institute, Berlin, and the University of Liverpool have discovered a natural nanoscale ice structure formed of pentagons.

"It is important to understand the structure of ice on the nanoscale, and in particular up against solid surfaces because this is how ice crystals form," explains the paper's first author Dr Javier Carrasco. "We need to understand the structure of ice crystals in the upper atmosphere because they play an important role in the formation of clouds and precipitation."

The formation of nanoscale ice crystals (i.e. nucleation) plays a key role in fields as diverse as atmospheric chemistry and biology. Ice nucleation on metal surfaces affords an opportunity to watch this process unfold at the molecular-scale on a well defined, plane interface. A common feature of structural models for such films of ice is that they are built from hexagonal arrangements of molecules.

In order to address the challenge of characterising ice on the nanoscale, the team from the LCN joined up with a team of experimentalists from the University of Liverpool (lead by Professor Andrew Hodgson) to examine ice formation on a very well defined, atomically flat copper surface. The Liverpool group performed scanning tunneling microscopy experiments and the LCN and Berlin teams carried out ab initio calculations to predict what the microscopy results would be. Only through the combination of these two state-of-the-art approaches were they able to definitively show that the ice structures that form are made from pentagons.


'/>"/>

Contact: Dr. Thierry Bontoux
t.bontoux@ucl.ac.uk
44-207-679-0056
University College London
Source:Eurekalert  

Related biology technology :

1. CJP Declares the Dates of 3rd Global Jatropha Hi-Tech Agricultural Training Programme
2. McCulley/Cuppan Announced Today The Launch Of A New Series Of Web-Based Training Programs For Professionals In The Biopharmaceutical And Life Science Industries
3. Advanced Technologies and Wireless Telecommunications Enhance Care and Medical Training at the Ryder Trauma Center in Miami
4. HEALTHeCAREERS Network Pledges $15,000 to ASRT Foundation for Professional Healthcare Training
5. Rapidly Expanding Ohio Bioscience Industry Drives New Workforce Training Program
6. Ziehm Imaging Extends its Training Offer
7. Upcoming Energy Psychology Event in Chapel Hill Will Provide Training in New Breakthrough Do It Yourself Healing
8. City of Hope Helps KGI Launch New Management Training Program for Scientists
9. Towards zero training for brain-computer interfacing
10. Microfiltration Membrane and Ultrafiltration Membrane Training
11. C3i Teams with Oracles Health Sciences Global Business Unit to Provide Customers with Clinical Training and Support Services
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
It's raining pentagons
(Date:10/11/2017)... ... October 11, 2017 , ... At its ... announced Dr. Suneel I. Sheikh, the co-founder, CEO and chief research scientist of ... been selected for membership in ARCS Alumni Hall of Fame . ASTER ...
(Date:10/11/2017)... , Oct. 11, 2017  VMS BioMarketing, a leading ... a nationwide oncology Clinical Nurse Educator (CNE) network, which will ... need for communication among health care professionals to enhance the ... nurses, office staff, and other health care professionals to help ... breast cancer. ...
(Date:10/10/2017)... CALIF. (PRWEB) , ... October 10, 2017 , ... San ... part of its corporate rebranding initiative announced today. The bold new look is ... reach, as the company moves into a significant growth period. , It will also ...
(Date:10/10/2017)... SomaGenics announced the receipt of a Phase ... (Single Cell), expected to be the first commercially available ... from single cells using NGS methods. The NIH,s recent ... development of approaches to analyze the heterogeneity of cell ... for measuring levels of mRNAs in individual cells have ...
Breaking Biology Technology:
(Date:4/3/2017)... WASHINGTON , April 3, 2017 /PRNewswire-USNewswire/ ... single-cell precision engineering platform, detected a statistically ... cell product prior to treatment and objective ... highlight the potential to predict whether cancer ... prior to treatment, as well as to ...
(Date:3/29/2017)... , March 29, 2017  higi, the health IT ... North America , today announced a ... the acquisition of EveryMove. The new investment and acquisition ... of tools to transform population health activities through the ... data. higi collects and secures data today ...
(Date:3/24/2017)... -- Research and Markets has announced the addition of ... - Industry Forecast to 2025" report to their offering. ... The Global Biometric Vehicle ... around 15.1% over the next decade to reach approximately $1,580 million ... estimates and forecasts for all the given segments on global as ...
Breaking Biology News(10 mins):