Fluid-inspired material self-heals before your eyes
It’s hard to believe that a tiny crack could take down a gigantic metal structure. But sometimes bridges collapse, pipelines rupture and fuselages detach from airplanes due to hard-to-detect corrosion in tiny cracks, scratches and dents.
A Northwestern University team has developed a new coating strategy for metal that self-heals within seconds when scratched, scraped or cracked. The novel material could prevent these tiny defects from turning into localized corrosion, which can cause major structures to fail.
“Localized corrosion is extremely dangerous,” said Jiaxing Huang, who led the research. “It is hard to prevent, hard to predict and hard to detect, but it can lead to catastrophic failure.”
When damaged by scratches and cracks, Huang’s patent-pending system readily flows and reconnects to rapidly heal right before the eyes. (Watch video.) The researchers demonstrated that the material can heal repeatedly — even after scratching the exact same spot nearly 200 times in a row.
The study was published today (Jan. 28) in Research, the first Science Partner Journal recently launched by the American Association for the Advancement of Science (AAAS) in collaboration with the China Association for Science and Technology (CAST). Huang is a professor of materials science and engineering in Northwestern’s McCormick School of Engineering.
While a few self-healing coatings already exist, those systems typically work for nanometer- to micron-sized damages. To develop a coating that can heal larger scratches in the millimeter-scale, Huang and his team looked to fluid.
“When a boat cuts through water, the water goes right back together,” Huang said. “The ‘cut’ quickly heals because water flows readily. We were inspired to realize that fluids, such as oils, are the ultimate self-healing system.”
But common oils flows too readily, Huang noted. So he and his team needed to develop a system with contradicting properties: fluidic enough to flow automatically but not so fluidic that it drips off the metal’s surface.
The team met the challenge by creating a network of lightweight particles — in this case graphene capsules — to thicken the oil. The network fixes the oil coating, keeping it from dripping. But when the network is damaged by a crack or scratch, it releases the oil to flow readily and reconnect. Huang said the material can be made with any hollow, lightweight particle — not just graphene.
“The particles essentially immobilize the oil film,” Huang said. “So it stays in place.”
The coating not only sticks, but it sticks well — even underwater and in harsh chemical environments, such as acid baths. Huang imagines that it could be painted onto bridges and boats that are naturally submerged underwater as well as metal structures near leaked or spilled highly corrosive fluids. The coating can also withstand strong turbulence and stick to sharp corners without budging. When brushed onto a surface from underwater, the coating goes on evenly without trapping tiny bubbles of air or moisture that often lead to pin holes and corrosion.
“Self-healing microcapsule-thickened oil barrier coatings” was supported by the Office of Naval Research (ONR N000141612838). Graduate student Alane Lim and Chenlong Cui, a former member of Huang’s research group, served as the paper’s co-first authors.
The Latest on: Self-healing material
via Google News
The Latest on: Self-healing material
- Global Self-healing Concrete Market Research and Industry Progression till 2025on May 29, 2020 at 8:55 am
According to a new market study published by Fior Markets, titledGlobal Self-healing Concrete Market, the market size of Self-healing Concrete is expected to see the highest growt ...
- Global Self-Healing Material Market (2019 to 2024) - Trends, Forecast and Opportunity Analysis - ResearchAndMarkets.comon May 27, 2020 at 5:38 am
Trends, Forecast, and Opportunity Analysis" report has been added to ResearchAndMarkets.com's offering. The future of the self-healing material market looks promising with opportunities in the ...
- How Dell and Levi's envision the future of repairon May 27, 2020 at 3:47 am
Why should this item be thrown away when it could be repaired or refreshed and for that matter, how long should I expect these things to last?" However, most brands are in the business of selling ...
- Researchers develop high-performance cancer vaccine using novel microcapsuleson May 22, 2020 at 11:03 am
Developing safe and efficient bioformulations using approved materials and ingenious designs can accelerate the clinical translation process.
- IDTechEx: Electrics and Electronics Becomes User-dedicated Smart Materialon May 21, 2020 at 10:19 am
An important new trend is buying electrics and electronics you customise to function not just shape. See the new IDTechEx report, "Complete Electronics as Smart Material, User-Customized 2020-2040." ...
- Smart concrete could let roads repair themselveson May 20, 2020 at 8:48 am
A new kind of concrete could let roads and bridges "heal" after cracking. That could cut down the costs and frequency of road repairs.
- Video: Self-repairing rubber can be recycledon May 19, 2020 at 1:42 pm
The rubber material is fabricated with industrial waste products sulfur, canola cooking oil and dicyclopentadiene from petroleum refining. The water- and corrosion-resistant rubber, which can also be ...
- Enabling highways and bridges to prevent their own damageon May 19, 2020 at 9:45 am
Her lab at Purdue University is developing technology that would allow concrete-paved bridges and highways to reveal more accurately when they need repairs and to come equipped with materials that ...
- Self-repairing rubber made from waste ideal for variety of uses, researchers sayon May 18, 2020 at 9:37 am
Scientists have developed a new type of rubber that is super-adhesive. When the material is combined with a special catalyst, it becomes self-healing.
via Bing News