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Research ‘Sees’ Rust on the Surface

Friday, July 10, 2015

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NEW YORK--Corrosion researchers know that what they see on the surface really does count.

So, a team at Lawrence Berkeley National Lab has devised a way to help scientists who study that multibillion-dollar problem—and other chemical reactions on a structure’s surface—see those surfaces more clearly.

“We are…quite excited by the possibilities of applying (the findings) to corrosion problems,” Laurence Marks, a professor of materials science and engineering at Northwestern University, said in a research announcement.

Berkeley Lab

A technique called “high-resolution scanning electron microscopy,” or HRSEM, extends scanning microscopy to the atomic scale and provides information on surface and bulk atoms simultaneously.

“The cost to industry and the military of corrosion is enormous, and we need to understand everything that is taking place to produce materials which will last longer,” he said.

Next-Gen Coatings

That means the development of materials and coatings that greatly improve protection against rust on ships, bridges and airplanes could come relatively soon, according to Marks and other researchers on the project.

Their findings also could lead to the development of “greener” fuel sources, because energy-dense fuels originate from surface reactions of sunlight and carbon dioxide.

The team's research, "Surface Determination through Atomically Resolved Secondary Electron Imaging,” was published June 17 in the journal Nature Communications.

‘Seeing’ Atoms

The research team found a way to read the information that is generated by a high-resolution scanning electron microscope, or HRSEM, so it can be used to “see” surfaces, even those that are rough or uneven.

Scanning electron microscope (SEM) imaging has been around for a while, but using it to analyze a surface’s atomic structure was not possible until the team figured out how to make sense of the results from the more powerful HRSEM.

Berkeley Lab/Roy Kaltschmidt

Jim Ciston and Colin Ophus work on the HRSEM at Berkeley Lab. They are part of a research team that has developed a way to "see" surface atoms more clearly.

Better yet, the new technology allows scientists to see below the surface as well.

“We’ve developed a reasonably direct method for determining the atomic structure of a surface that also addresses the very challenging problem of buried interfaces,” said Jim Ciston, a staff scientist with the National Center for Electron Microscopy at the Molecular Foundry.

The Big Deal

What's the big deal about being able to hone in atomically on a surface, which accounts for only a fraction of any material? Because, when it comes to the corrosion process, that's where the action is.

“Although surface atoms represent a minuscule fraction of the total number of atoms in a material, these atoms drive a large portion of the material’s chemical interactions with its environment,” said Ciston.

Researchers devised their technique by looking at the secondary electrons produced during traditional SEM. Those electrons are the result of highly energized beams of electrons striking a material and causing the atoms in that material to emit energy as electrons rather than as photons.

Berkeley Lab

Surface atoms represent a small fraction of the total number of atoms in a material, but they drive a large portion of the material's chemical interactions—such as rusting—with its environment.

Checking the Results

Researchers checked their calculations using the surface of strontium titanate, which is well-known to those who study atomic structures.

“Conventional transmission electron microscopy images are well-understood, and were needed to confirm that we actually had the correct structure and that the new HRSEM theory was on the right track,” said Ciston.

“Taken collectively, the analysis enabled us to unambiguously reference surface information to information from the bulk crystal,” he said.

In fact, Ciston said: “We started this work by investigating a well-studied material, but the new technique is so powerful that we had to revise much of was already thought to be well-known.”

Researchers said the next step would be to see how well the technique can be used to analyze nanoparticles.

In addition to Ciston, Allen and Marks, co-authors of the study were Hamish Brown; Adrian D’Alfonso; Pratik Koirala; Colin Ophus; Yuyuan Lin; Yuya Suzuki; Hiromi Inada; and Yimei Zhu.

The Department of Energy provided most of the funding for the study.

   

Tagged categories: Coating Materials; Coatings Technology; Corrosion protection; Lawrence Berkeley National Laboratory; Microscopy; North America; Protective Coatings; Research; Rust; U.S. Department of Energy

Comment from luiz de miranda, (7/10/2015, 10:13 AM)

I am very glad with this study. At later 1974 at Free University of Brussels I presented my dotoral. dissertation on the protective rust formed on weathering steel. This work was carried-out under the direction of the late Prof. Marcel Pourbaix and extensively quoted by U.R.EVANS in his textbook "CORROSION, 2d.Supplementary Vol, chapter 13 (Arnold, ed). In fact, "rust" is not an unique product. For each climate a lot of specific "rusts" is formed and yield distint possibility of electrochemical variables. At the time of my thesis, electronic microscopy, Auger spectra, and correlates techniques were the must" to search morphological structures. Now, with the team at Lawrence Berkeley National, corrosionist are able to broad those studies . Thank you very much guys


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