Biomedical researchers have begun creating porous structures from titanium alloys by smashing powder particles together at supersonic speeds in an extreme combination of 3D printing and spray painting.
The Cornell University-led team created the porous materials, that are allegedly 40 percent stronger than traditional manufacturing can achieve, using an existing 3D printing technique known as “cold spray.”
Normal additive manufacturing (3D printing) requires high temperatures to heat metals beyond their melting points so they can be shaped, but this can lead to issues including distortions in biomedical implants over time.
Instead, lead author Atieh Moridi and her team developed a method in which they used highly compressed gas to blast titanium alloy particles at a support structure, in a kind of ‘3D painting’.
“We focused on making cellular structures, which have lots of applications in thermal management, energy absorption and biomedicine,” said Moridi, assistant professor in the Sibley School of Mechanical and Aerospace Engineering.
The titanium alloy particles measure between 45 and 106 microns in diameter (a micron is one-millionth of a meter) and were fired at a substrate base, at 600 meters per second, faster than the speed of sound. The average bullet travels at 760 meters per second.
The titanium structures’ small size and porous texture make them an ideal candidate for use within the human body for implants such as joint replacements, according to the Cornell team.
The researchers had to find the goldilocks zone in order to make the materials stick, in between the alloy’s critical velocity, where it can form a dense solid and its erosion velocity, where it just disintegrates before a useful structure can form.
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By locating the sweet spot just below the titanium alloy’s critical velocity, the team was able to create porous but sturdy structures ideal for creating artificial joints for the knee or hip, or for use in cranial and facial reconstruction implants after a traumatic injury.
Furthermore, patients’ bones are able to grow inside the structures allowing them to properly fix in place and maintain biomechanical integrity, while reducing the need for possible follow-up surgeries significantly.
“This helps reduce the likelihood of the implant loosening. And this is a big deal. There are lots of revision surgeries that patients have to go through to remove the implant just because it’s loose and it causes a lot of pain,”Moridi said, adding that the technique has larger-scale industrial applications including in the construction, transportation and energy sectors.
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East Palestine residents remain “in constant contact” with toxic pollutants, a US scientist says
The pollutants in the air of East Palestine, Ohio, may pose long-term health risks, scientists from Texas A&M and Carnegie Mellon University claimed on Wednesday. Their assessment contrasts the US Environmental Protection Agency’s (EPA) assurance that the pollution does not pose an immediate health risk.
Dr. Albert Presto, an associate research professor at Carnegie Mellon University, told CNN on Wednesday that the situation in East Palestine was not an “immediate health concern” but that it could still pose long-term risks as the researchers had no way of telling how long the hazardous chemical concentration would persist. He added that the residents of the city were in “constant contact” with the pollutants and there was no clear understanding of what that level of exposure would mean for the population’s health.
The air in the Ohio city was contaminated in early February, after 38 cars of a Norfolk Southern freight train derailed and spilled out the hazardous materials they were carrying. The accident caused a fire that went on for multiple days and intensified the airborne spread of the chemical pollution, causing a mandatory evacuation of the nearby residents. The EPA has been conducting various tests and measurements in the affected area, claiming there was no immediate risk to the local population.
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Texas A&M and Carnegie Mellon presented their independent assessment in a Twitter post last week. The scientists claim to have used data compiled by the EPA and found that nine of the 50 chemicals found in East Palestine’s air were above the norm for the region. In particular, the report singles out acrolein, a toxic substance used to control plants, algae, rodents and microorganisms.
The EPA responded to the claims in the report from the two universities by dismissing the perceived risks. A spokesperson for the agency told CNN on Monday that the report assumed “a lifetime of exposure, which is constant exposure over approximately 70 years” for the harmful effects to manifest. They added: “EPA does not anticipate levels of these chemicals will stay high for anywhere near that.”
Dr. Ivan Rusyn, the director of the Texas A&M University Superfund Research Center and part of the team that did the analysis, told CNN on Wednesday that “all sides were right” as both parties simply needed to keep monitoring the situation and “do a better job communicating the results.”
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Dutch seismologist Frank Hoogerbeets, who rose to international prominence after predicting the devastating earthquakes in Türkiye and Syria last month, has said that the world could be hit with another major quake in the coming days.
Hoogerbeets, who makes his forecasts based on the motions of celestial bodies, published a video on YouTube on Monday in which he warned that “the first week of March is going to be extremely critical.”
“A convergence of critical planetary geometry around March 2 and 5 may result in large to very large seismic activity, possibly even a mega-thrust earthquake around March 3 and 4 and/or March 6 and 7,” the description to the clip read.
In the video itself, the seismologist claimed that the power of the supposed impending quake “may be well over 8 magnitude.”
The affected area could stretch thousands of kilometers, from the Kamchatka Peninsula and the Kuril Islands in Russia’s Far East, all the way down to the Philippines and Indonesia, Hoogerbeets said.
Costs from Türkiye’s massive quake rising
“I’m not exaggerating. I’m not trying to create fear. This is a warning,” insisted the scientist, who works at the Solar System Geometry Survey (SSGEOS).
The head of the Kamchatka branch of the Geophysical Survey of Russia’s Academy of Sciences, Danila Chebrov, has questioned Hoogerbeets’ predictions and described him as an “amateur.” The connection between the movements of the planets in the solar system and seismic activity on Earth “is rather weak, and it’s problematic to use it as the main prognostic tool,” Chebrov explained.
On February 3, Hoogerbeets issued a tweet that read: “Sooner or later there will be a magnitude 7.5 earthquake in this region (South-Central Turkey, Jordan, Syria, Lebanon).”
Three days later, a 7.8 magnitude quake struck Türkiye and Syria. The disaster has caused the deaths of more than 50,000 people, with powerful aftershocks continuing in the region to this day.
Dutch seismologist Hoogerbeets has made predictions down the years which didn’t come true. Commenting on his work earlier this month, Susan Hough of the US Geological Survey insisted that no scientist has “ever predicted a major earthquake.” Hough told NPR that the spot-on forecast for the quakes in Türkiye and Syria was just a coincidence. “It’s the stopped clock that’s right twice a day, basically,” she said.
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A local newspaper cites experts warning of a potential catastrophe if an earthquake hits the country’s biggest city
Istanbul should prepare itself for a powerful quake, scientists and public figures have warned. This month’s disaster in southern Turkey, which claimed tens of thousands of lives, is a “rehearsal” for what could come next, they argued in the newspaper Hurriyet on Friday.
When the next Istanbul earthquake happens, the damage “will swallow everyone,” unless people drop their differences and work on improving the seismic resilience of the city, Turkish author Nedim Sener wrote.
He cited a risk assessment by Bogazici University’s quake research lab, which counted how many buildings would be impacted by an earthquake of 7.5+ magnitude in Türkiye’s most populous and economically vital hub. With almost 13,500 structures expected to be heavily damaged, and hundreds of thousands of others affected to a smaller degree, the loss of life would be greater than what the country has just experienced, Sener predicted.
Some Turkish officials, including Istanbul Mayor Ekrem Imamoglu, have voiced similar concerns. The head of the city administration said 90,000 structures were at risk of total collapse in case of a major earthquake, citing a fresh survey by his municipality.
Cost of Türkiye quake damage estimated
Speaking in a TV interview this week, Imamoglu criticized the central government for issuing an amnesty to some 317,000 buildings which failed to meet earthquake resilience codes. It meant that the owners were allowed to pay a fine rather than demolish their properties.
Istanbul is located near a tectonic fault line that passes under the Marmara Sea. The 1999 quake in Izmit, which killed over 17,000 people, struck some 80 kilometers east of the city center, and half that distance from its easternmost suburbs.
Turkish Seismologist Naci Gorur, from Istanbul Technical University, warned that the risk of a major quake hitting Istanbul in the near future was growing. The probability of a tremor measuring over 7 magnitude occurring near the city within 30 years has increased from 62% in the aftermath of the 1999 disaster to 80% now, he said during a TV appearance. The scientists cited calculations by Tom Parsons, a fellow researcher at the US Geological Survey.
The twin quakes on February 6 caused massive devastation in Türkiye and northern Syria. Their combined death toll is estimated at around 44,000, including over 38,000 on the Turkish side.
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