Navigation Links
Study led by GW professor provides better understanding of water's freezing behavior at nanoscale

The results of a new study led by George Washington University Professor Tianshu Li provide direct computational evidence that nucleation of ice in small droplets is strongly size-dependent, an important conclusion in understanding water's behavior at the nanoscale. The formation of ice at the nanoscale is a challenging, basic scientific research question whose answer also has important implications for climate research and other fields.

The crystallization of ice from supercooled water is generally initiated by a process called nucleation. Because of the speed and size of nucleationit occurs within nanoseconds and nanometersprobing it by experiment or simulation is a major challenge.

By using an advanced simulation method, Dr. Li and his collaborators, Davide Donadio of Germany's Max Planck Institute for Polymer Research, and Giulia Galli, a professor of chemistry and physics at the University of California, Davis, were able to demonstrate that nucleation of ice is substantially suppressed in nano-sized water droplets. Their paper, "Ice nucleation at the nanoscale probes no man's land of water," was published today in the journal Nature Communications.

"A current challenge for scientists is to unveil water's behaviors below -35 degrees Celsius and above -123 degrees Celsius, a temperature range that chemists call 'no man's land,' " said Dr. Li, a professor of civil and environmental engineering at the George Washington University School of Engineering and Applied Science. "Fast ice crystallization can hardly be avoided at such low temperatures, so maintaining water in a liquid state is a major experimental challenge."

Since the frequency of ice nucleation scales with the volume of water, one of the strategies for overcoming this kinetic barrier is to reduce the volume of water. However, this raises the question of whether water at the nanoscale can still be regarded as equivalent to bulk water, and if not, where that boundary would be.

The team's results answer this question. By showing that the ice nucleation rate at the nanoscale can be several orders of magnitude smaller than that of bulk water, they demonstrate that water at such a small scale can no longer be considered bulk water.

"We also predict where this boundary would reside at various temperatures," Dr. Li said. The boundary refers to the size of the droplet where the difference vanishes. The team's findings will help with the interpretation of molecular beam experiments and set the guidelines for experiments that probe the 'no man's land' of water.

The results are also of importance in atmospheric science, as they may improve the climate model of the formation of ice clouds in upper troposphere, which effectively scatter incoming solar radiation and prevent earth from becoming overheated by the sun. The results have important implications in climate control research, too. One of the current debates is whether the formation of ice occurs near the surface or within the micrometer-sized droplets suspended in clouds. If it is the former, effective engineering approaches may be able to be taken to tune the surface tension of water so that the ice crystallization rate can be controlled.

"Our results, indeed, support the hypothesis of surface crystallization of ice in microscopic water droplets," Dr. Li said. "Obtaining the direct evidence is our next step."


Contact: Joanne Welsh
George Washington University

Related biology technology :

1. MacroGenics Announces Margetuximab (MGAH22) Phase 1 Data Presentation at ASCO; Initiates Phase 2 Clinical Study to Evaluate Activity of Margetuximab in Patients with Metastatic Breast Cancer
2. Inflamax Research selected by the Immune Tolerance Network and the National Institutes of Health to conduct a landmark clinical study on the underlying mechanisms of allergic inflammation.
3. Allegheny General Hospital Cardiovascular Institute Becomes Exclusive Pittsburgh Site for Study of Novel Coronary Artery Disease Device
4. HealthSparq to Reveal New Healthcare Transparency Benchmark Study at AHIP Institute 2013
5. FDA/PhUSE Collaboration: Study Data Reviewer’s Guide Work Package v1.1 Available
6. Study finds plasmin -- delivered through a bubble -- more effective than tPA in busting clots
7. Study: FOLFIRINOX Followed by Chemoradiation Shows Substantial Activity in Locally Advanced Pancreatic Cancer
8. Preclinical study shows heroin vaccine blocks relapse
9. New Study on Cordyceps Sinensis (Hirsutella Sinensis) Shows Anti-Inflammatory Properties
10. New Study: Valtrex (Valacyclovir) Side Effects Target the Brain; polyDNA Suggests a Natural Herpes Remedy
11. Wysebridge Patent Bar Review Launches America Invents Act (AIA) Study Suite
Post Your Comments:
(Date:6/27/2016)... ... 2016 , ... Newly created 4Sight Medical Solutions ... healthcare market. The company's primary focus is on new product introductions, to include ... are necessary to help companies efficiently bring their products to market. , The ...
(Date:6/27/2016)... , June 27, 2016   Ginkgo Bioworks , ... industrial engineering, was today awarded as one of ... of the world,s most innovative companies. Ginkgo Bioworks ... for the real world in the nutrition, health ... work directly with customers including Fortune 500 companies ...
(Date:6/24/2016)... ... June 24, 2016 , ... While the majority of commercial spectrophotometers and ... and the 6000i models are higher end machines that use the more unconventional z-dimension ... light beam from the bottom of the cuvette holder. , FireflySci has developed ...
(Date:6/23/2016)... ... June 23, 2016 , ... ... to announce the launch of their brand, UP4™ Probiotics, into Target stores nationwide. ... years, is proud to add Target to its list of well-respected retailers. This ...
Breaking Biology Technology:
(Date:4/15/2016)... 15, 2016 Research and ... Biometrics Market 2016-2020,"  report to their offering.  , ... , ,The global gait biometrics market is expected ... the period 2016-2020. Gait analysis generates ... be used to compute factors that are not ...
(Date:3/31/2016)... 2016  Genomics firm Nabsys has completed a financial ... Bready , M.D., who returned to the company in ... leadership team, including Chief Technology Officer, John Oliver ... Nurnberg and Vice President of Software and Informatics, ... Dr. Bready served as CEO of Nabsys from ...
(Date:3/22/2016)... PROVO and SANDY, Utah ... (NSO), which operates the highest sample volume laboratory in ... Tute Genomics and UNIConnect, leaders in clinical sequencing informatics ... the launch of a project to establish the informatics ... NSO has been contracted by the ...
Breaking Biology News(10 mins):