Futuristic liquid robots made possible by giant leap in magnetic research

20 Juillet, 2019, 03:22 | Auteur: Therese Cote
  • Scientists create method to print magnetic liquid droplets

This could include artificial cells that can deliver targeted cancer therapies, or flexible liquid robots that can change their shape to adapt to their surroundings.

A team led by material scientist Professor Thomas Russell, from the University of MA, spent seven years developing a method to magnetise metallic fluids - making it possible to control their shape with magnets. Russell is the head of a program called Adaptive Interfacial Assemblies Towards Structuring Liquids. The new ferromagnetic liquid droplets "represent a milestone for the further development of magnetic materials", Russell says. "No one has ever observed this before", explained Russell.

"This opens the door", Russell said, "to a new area of science in magnetic soft matter".

Also contributing to the study were researchers from UC Santa Cruz, UC Berkeley, the WPI-Advanced Institute for Materials Research (WPI-AIMR) at Tohoku University, and Beijing University of Chemical Technology.

Trump steps back from 'send her back' chanting by supporters
Speaking to reporters the day after the incident, the Minnesota representative said: "We are Americans as much as everyone else". In February, the 37-year-old sparked an uproar when she suggested money is why so many United States politicians support Israel.

Gibraltar court extends detention of oil tanker
But Britain, which wants to preserve the nuclear deal, has repeatedly indicated it wants a compromise over the tanker. An initial order by the court authorising the detention of the vessel would lapse after Friday.

Former Giants Player Mitch Petrus Dies Of Heatstroke At 32
Petrus reportedly was not feeling well and was taken to Baptist Health Medical Center-North Little Rock, authorities said. He was working outside at his family's business in Little Rock, Arkansas when he fell ill on Thursday.

Using a previously developed 3D printing technique, involving a Qidi X-one 3D printer, Russel and Liu 3D printed 1 millimeter droplets from a ferrofluid solution, containing iron-oxide nanoparticles only 20 nanometers in length. On top of that, the droplets may be tuned so their magnetism could be switched on and off at will. However, when the coil was removed, the droplets kept their magnetism permanently, while gravitating towards each other in flawless unison, in what the scientists described as an "elegant swirl" or "little dancing droplets".

Magnets, as we all know them, are always solid. When ferrofluid is removed from the presence of a magnetic field, the nanoparticles fall into disarray, and the fluid just becomes sort of blobby. GIF via Xubo Liu/Berkeley Lab.

Through magnetometry measurements, the scientists found that when they placed a magnetic field by a droplet, all of the nanoparticles' north-south poles, from the 70 billion iron-oxide nanoparticles floating around in the droplet to the 1 billion nanoparticles on the droplet's surface, responded in unison, just like a solid magnet. Significantly, this was enabled by the "interfacial jamming' of the nanoparticles at the droplet's surface, which are packed tightly together with only nanometers between each of the nanoparticles, creating the solid surface". But when the magnetic field is taken away, there's no room for the surface particles to drift because they're jammed so closely together, and thus stay that way. The researchers also discovered that divided droplets retained their magnetic properties.

Among the magnetic droplets' many awesome qualities, what stands out even more, Russell noted, is that they change shape to adapt to their surroundings. Using a modified 3D printer, a team of scientists at the Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) have done just that. "What began as a curious observation ended up opening a new area of science", added Liu. "It's something all young researchers dream of, and I was lucky to have the chance to work with a great group of scientists supported by Berkeley Lab's world-class user facilities to make it a reality", mentioned Xubo Liu. However, unlike normal ferrofluids, this magnetism remained even after the coil was eliminated.


  • USA weather: Potentially deadly heat wave set to break records

    In several cities, buildings are being offered as cooling centers and residents are being asked to check on family and neighbors. The National Weather Service website has an hourly forecast you can check if you want to see when the heat will be the worst.
    United Kingdom  delay on Huawei 5G decision harming ties, lawmakers say

    United Kingdom delay on Huawei 5G decision harming ties, lawmakers say

    Huawei Vice President Victor Zhang said: "We agree that diversity improves resilience in networks". Conversely, China has warned Britain that excluding the firm could hurt investment and trade.


    Producer and series creator John Carpenter has taken to Twitter to announce that there will be back-to-back Halloween sequels. The 40-year-old saga of Michael Myers and Laurie Strode is coming to Wilmington to film two more installments, WECT reports.
  • Toys R Us makes small comeback with 2 stores

    Toys R Us makes small comeback with 2 stores

    The tech company will also offer brands access to data that will track traffic patterns and other metrics. Even as it went bankrupt, the original Toys R Us accounted for about a fifth of toy sales in the U.S.
    De Ligt :

    De Ligt : "J’ai toujours aimé la Juve, j’étais fan"

    Enfin! Après de longs mois d'un feuilleton qui a semblé interminable, Matthijs De Ligt a signé à la Juventus . La Juve ajoute qu'elle va également payer 10,5 millions de frais accessoires supplémentaires.
    Scientists: Let's just spray trillions of tons of snow on Antarctica?

    Scientists: Let's just spray trillions of tons of snow on Antarctica?

    Thus the risks and costs of such an unprecedented endeavour must be weighted very carefully against its potential benefits. Researchers used computer simulations created to predict future loss.
  • Arsenal will have new captain

    Arsenal will have new captain

    Meanwhile, Emery will stick with his plans to have a captaincy group despite seeing his first break up inside less than a year. Centre-back Holding, 23, suffered a serious knee injury in December and was expected to miss the start of the season.
    Trump tweets he liked Fed's Williams' 'first statement' better than second

    Trump tweets he liked Fed's Williams' 'first statement' better than second

    But most analysts don't expect an agreement any time soon, with some predicting a strong risk of further tariff escalation. A gauge of global stocks declined after early gains dissipated on Friday as expectations for a strongly dovish U.S.
    House votes to kill Cadillac Tax provision of Obamacare

    House votes to kill Cadillac Tax provision of Obamacare

    The nonpartisan Congressional Budget Office estimated that repeal of the tax would add $197 billion to deficits over a decade. The vote to repeal the tax highlights the conflicting forces pulling at Democrats when campaigning versus legislating.
  • Bernie Sanders campaign workers unionize, demand his promised $15-an-hour

    Bernie Sanders campaign workers unionize, demand his promised $15-an-hour

    The democratic socialist has long lobbied for a minimum wage hike, which makes this new Washington Post report all the more juicy. But unionized workers on Sanders' own campaign say they wish he would start now - by paying a higher wage to them.
    Milan Lucic traded to the Flames for James Neal

    Milan Lucic traded to the Flames for James Neal

    Beyond the change of scenery thing, Neal's contract would be much easier to buy out than Lucic's buyout-proof deal. Milan Lucic was traded to the Calgary Flames by the Edmonton Oilers for James Neal , TSN reported Friday.
    India floods: exhausted  tiger takes nap in resident's bed

    India floods: exhausted tiger takes nap in resident's bed

    The death toll in India has climbed to 97 in the past week, and there are fears this number may grow. A man in the flood-ravaged Assam state of India was stunned to find an intruder napping in his home.


Australian man's 'suspicious' death after body found on Canadian highway
The body of Lucas Fowler , the son of Hills District Chief Inspector Stephen Fowler, was found on the Alaska Highway on July 15. Few details of the homicides have been released by RCMP in British Columbia .

New mid-engine Corvette starts under $60,000
The 2020 version was unveiled Thursday night in a glitzy ceremony at a World War II dirigible hangar in Orange County, California. President Mark Reuss said the C8 will start below $60,000, 7% more than the current Corvette's base price of $55,900.

Rangers sign Trouba to reported 7-year deal with $8M AAV
The 25-year-old scored eight goals and posted a career-high 50 points in 82 games this past season with the Winnipeg Jets . I mean, it's NY so you've got a big stage and they expect a lot out of their team.

First Teaser for 'The Witcher' Netflix Series Released
As soon as one is announced, we'll have it here on Cinelinx. "I've played the games a lot", he said. Plus, in an interesting twist, there's no main baddie.

NAB appoints ex-RBS chief Ross McEwan as CEO
Ross McEwan says he won't be joining a "broken bank" when he becomes NAB chief executive, but knows he will have a significant fix job on his hands.

Champions League debacle fires up Pochettino for next season
I am not a person to avoid problems or hard situations. "I more love a big, hard challenge and to rebuild that mentality so it's possible to have a similar season I think that excites and motivates me a lot". "I'm always happy.

Grèce: fort séisme ressenti à Athènes, les télécommunications affectées
Une personne a été blessée par la chute de morceaux de plâtre et transférée à l'hôpital, selon les services de secours. Les pompiers sont intervenus notamment dans des bâtiments où des personnes étaient bloquées dans les ascenseurs.

Lowry claims share of Open lead at halfway point
He will, as he says, likely win again, and it may not be long before that happens. "I felt bad for David". At Carnoustie 12 months ago he made the cut right on the mark with an 18-foot putt at the last on Friday.

Man scales down Philadelphia high-rise to escape fire
They also stretched the line to the 15th floor and flooded the bin chute from there as an extra safety measure, authorities said. Hundreds of people were evacuated and four people inside had to be treated at the hospital for smoke inhalation.

Aaron Boone gets one-game suspension for 'f--king savages' rant
Boone was tossed after Brett Gardner was called out on strikes, after berating the umpire with profanities from the dugout. Boone then ran out and kept up the argument, getting close to Miller's face and clapping his hands for emphasis.