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:2/4/2016)... ... , ... Shimadzu Scientific Instruments will showcase several new products, ... sessions, and present on the analysis of mycotoxins and medical cannabis at the ... at the Georgia World Congress Center in Atlanta, Georgia. , Attendees should ...
(Date:2/4/2016)... YORK , February 4, 2016 ... QBIO), a biotechnology acceleration company is pleased to provide the ... --> Over the last 3 months we ... and securities purchase agreements exceeding $1,000,000. As a result, we ... our Mannin Research Inc. license agreement and expect that development ...
(Date:2/4/2016)... Strasbourg, France , to the US ... Strasbourg, France , to the US company Advanced Bioscience ... announce that it acted as an advisor to Transgene on ... Strasbourg, France , to the US company Advanced Bioscience ... Transgene (Euronext: TNG), a member of Institut Mérieux, is ...
(Date:2/3/2016)... , Feb. 3, 2016 Ascendis Pharma A/S ... that applies its innovative TransCon technology to address significant ... an upcoming investor conference.Event:2016 Leerink Partners Global Healthcare Conference ... , Wednesday, February 10, 2016 Time:  , 11:55am ... . --> An audio webcast of this ...
Breaking Biology Technology:
(Date:1/20/2016)... 2016   MedNet Solutions , an innovative SaaS-based ... clinical research, is pleased to announce the attainment of ... the result of the company,s laser focus on (and ... , it,s comprehensive, easy-to-use and highly affordable cloud-based technology ... Key MedNet growth achievements in 2015 include: ...
(Date:1/18/2016)... Calif. , Jan. 18, 2016  Extenua ... software that simplifies the use and access of ... and go-to-market partnership with American Cyber.  ... brings extensive experience leading transformational C4ISR and Cyber ... and integrating the latest proven technology solutions," said ...
(Date:1/13/2016)... January 13, 2016 --> ... a new market report titled - Biometric Sensors Market - ... 2015 - 2023. According to the report, the global biometric sensors ... anticipated to reach US$1,625.8 mn by 2023, expanding at ... terms of volume, the biometric sensors market is expected ...
Breaking Biology News(10 mins):