New synthetic nanoparticle could disinfect, depollute, and desalinate contaminated water and then get removed magnetically
Among its many talents, silver is an antibiotic. Titanium dioxide is known to glom on to certain heavy metals and pollutants. Other materials do the same for salt. In recent years, environmental engineers have sought to disinfect, depollute, and desalinate contaminated water using nanoscale particles of these active materials. Engineers call them nanoscavengers. The hitch from a technical standpoint is that it is nearly impossible to reclaim the nanoscavengers once in the water.
In a paper published online May 14 in the journal Nature Communications, an interdisciplinary team of engineers at Stanford University announces it has developed a new type of nanoscavenger with a synthetic core that is ultraresponsive to magnetism, allowing the easy and efficient recovery of virtually every one of the nanoscale purifiers.
“In contaminated water, nanoscavengers float around, randomly bumping into and killing bacteria or attaching themselves to the molecular pollutants they are after,” said Shan Wang, the study’s senior author and a professor of material science and engineering and jointly of electrical engineering. “When the contaminants are either stuck to the nanoscavenger or dead, the magnet is turned on and the particles vanish.”
ULTRARESPONSIVE TO MAGNETISM
The use of magnetism to recover nanoscavengers is not new. There are commercial technologies today that have fashioned nanoscavengers with a core of magnetic iron oxide surrounded by an active material, but these ingenious methods are less than perfect. Iron oxide is not absolutely responsive to magnetism and too many nanoscavengers remain in the water for it to be considered safe for human use.
The Stanford advance replaces the iron oxide with a synthetic material. The Stanford core is, in reality, not a single material, but a disk of several layers – magnetic outer layers of the synthetic material sandwiched on either side of a titanium center, but with a twist.
“The magnetic moments of the two outer layers are opposed. The direction of the magnetic force in the top layer and the bottom layer point in opposite directions, effectively canceling the magnetic properties of the material,” said Mingliang Zhang, a doctoral candidate in material science and engineering and co-first author of the study.
In their natural state, the new nanoscavengers are not magnetic and would not be attracted to another magnetic material. When the composite discs are exposed to a strong magnetic field, however, the magnetism of the two opposing fields turn into alignment, not just becoming magnetic but compounding the magnetic effect.
In doing so, the nanoscavengers become ultraresponsive to magnetism, far more so than the base iron oxide used in today’s technologies. The Stanford team has dubbed its advance with the oxymoronic name: “synthetic antiferromagnetic cores.” The prefix anti- in this case means in opposite direction, not non-magnetic.
With a successful core created, the researchers then cap it with silver or titanium dioxide or another reactive material depending upon the contaminant they are targeting. In live tests using synthetic-core, silver-capped nanoscavengers immersed in water tainted with E. coli bacteria, using a silver dosage of just 17 parts per million, the Stanford team was able to kill 99.9% of the bacteria in just 20 minutes. Better yet, they removed virtually all of the nanoscavengers in just five minutes of exposure to a permanent magnet.
The Latest Bing News on:
- Feed has no items.
The Latest Google Headlines on:
The Latest Bing News on:
- Nanoparticle injections into arthritic knees could slow cartilage losson January 18, 2021 at 6:25 pm
Osteoarthritis is a painful, debilitating and fairly common condition that’s hard to slow or stop, so treatment options are mostly limited to reducing pain. But a new study in mice has now found that ...
- New Target Halts Osteoarthritis-type Knee Cartilage Degenerationon January 18, 2021 at 9:27 am
These researchers showed that they could target a specific protein pathway in mice, put it into overdrive and halt cartilage degeneration over time. Building on that finding, they were able to show ...
- Cellulose Nanoparticles Market Trends in 2020, Size, Industry Revenue, Growth Insights to 2026on January 13, 2021 at 4:31 am
Wiseguyreports.Com Adds "Cellulose Nanoparticles -Market Demand ... and the high-energy intensity in production of chemicals and synthetic polymers. Varied applications of cellulose nanoparticles ...
- Nanoparticle Vaccine Technology Introduces Immune System to a Variety of Different Coronaviruseson January 13, 2021 at 2:21 am
A Caltech team has designed a protein-based 60-subunit nanoparticle onto which pieces of up to eight different types of coronavirus have been attached. When injected into mice, this vaccine induces ...
- RNA Vaccines And Their Lipidson January 11, 2021 at 8:57 pm
I want to start off by recommending this piece by Bert Hubert on the workings of the Pfizer/BioNTech vaccine - Bert goes into a lot of detail that I'm going to run through rather quickly in the next ...
- DoE achieves breakthrough in artificial photosynthesison January 11, 2021 at 4:00 pm
“This new platform allow us to combine these chromophores and catalysts without the need of complicated synthetic procedures and with ... enough of a jolt to send it to the surface of the nanoparticle ...
- DevaCell to Present at the H.C. Wainwright BIOCONNECT 2021 Virtual Conferenceon January 6, 2021 at 10:19 am
DevaCell's DEVA (designer encapsulated viral assembly) is the foundational innovation for the company's transformative nanoparticle-based, ONCoatTM synthetic vector platform technology, which is ...
- Synthetic Psychedelic Treats Depression Without Hallucinationson January 5, 2021 at 9:42 am
Using a drug-designing method known as function-oriented synthesis, they were able to identify core aspects of how ibogaine works to recreate in a synthetic molecule called tabernanthalog (TBG). So ...
- Full mitochondrial control for the ultimate anticancer biohackon January 5, 2021 at 5:55 am
In other words, to curtail energetic and synthetic processes just enough ... a two-in-one blow by combining GA and doxorubicin on a nanoparticle shell, with a TPP‐doxorubicin combo in the ...
- Emergex Vaccines signs Collaboration Agreement with Brazil's Bio-Manguinhos/Fiocruz for the Development of a COVID-19 Vaccineon January 5, 2021 at 4:00 am
PRESS RELEASE Emergex Vaccines signs Collaboration Agreement with Brazil's Bio-Manguinhos/Fiocruz for the Development of a COVID-19 Vaccine Agreement provides a framework ...