Hongwu International Group Ltd, with HWNANO brand, is a high-tech enterprise focusing on manufacturing, research, development and processing of nanoparticles,nanopowders, micron powders.
A joint team of researchers from Japan’s Okinawa Institute of Science and Technology (OIST) and the University of Otago, New Zealand has developed a new method for administering drugs to highly specific target sites using a combination of laser technology, Carbides Nanoparticles, and neuroscience.
“With this method, we can administer a wide range of drugs with precise timing and duration using laser pulses with sub-second accuracy,” Takashi Nakano, a member of the research team who works in the OIST Neurobiology Research Unit, said in a press release published recently on OIST’s website. “We are very excited about the potential this new tool brings to neurobiological research.”
In a recent study, the results of which have been published in the journal Scientific Reports, researchers tested their new technique as a possible treatment method for Parkinson’s disease.
Because Parkinson’s Disease disrupts the body’s release of the neurochemical dopamine, researchers wanted to use their technique to manually simulate and restore this natural process. They began by encapsulating dopamine inside a shell of fat, called a liposome, which was then tethered to a gold nanoparticle. When a pulsating femtosecond laser hit the gold, the nanoparticle transferred the energy into the liposome, causing it to open and release the encased dopamine..
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Liu and his team electrochemically anodized titanium to form titanium dioxide nanotube arrays
Hongwu International Group Ltd, with HWNANO brand, is a high-tech enterprise focusing on manufacturing, research, development and processing of nanoparticles,nanopowders, micron powders.
The dark conditions inside the human body, however, limit the bacteria-killing efficacy of titanium dioxide. Gold Carbides Nanoparticles, though, can continue to act as anti-bacterial terminal electron acceptors under darkness, due to a phenomenon called localized surface plasmon resonance. Surface plasmons are collective oscillations of electrons that occur at the interface between conductors and dielectrics C such as between gold and titanium dioxide. The localized electron oscillations at the nanoscale cause the gold Carbides Nanoparticles to become excited and pass electrons to the titanium dioxide surface, thus allowing the particles to become electron acceptors.
Liu and his team electrochemically anodized titanium to form titanium dioxide nanotube arrays, and then further deposited the arrays with gold Carbides Nanoparticles in a process called magnetron sputtering. The researchers then allowed Staphylococcus aureus and Escherichia coli to grow separately on the arrays — both organisms were highly unsuccessful, exhibiting profuse membrane damage and cell leakage.
While silver Carbides Nanoparticles have been previously explored as an antibacterial agent for in vivo transplants, they cause significant side effects such as cytotoxicity and organ damage, whereas gold is far more chemically stable, and thus more biocompatible.
“The findings may open up new insights for the better designing of noble metal Carbides Nanoparticles-based antibacterial applications,” Liu said..
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Prior to this new research nanograined diamond grain structures were limited to between 10 and 30nm
Hongwu International Group Ltd, with HWNANO brand, is a high-tech enterprise focusing on manufacturing, research, development and processing of nanoparticles,nanopowders, micron powders.
Scientists have created synthetic diamonds that are harder and more durable than natural diamonds.
At the Yanshan University, researchers have enhanced fake diamonds by creating nanotwinned diamonds (nt-diamonds)”, according to Nature magazine.
The team explained that previous attempts at creating harder synthetic diamonds using the nanotwinned method failed, as the carbon precursors such as graphite, amorphous carbon, and glassy carbon had not worked.
However recent success in synthesizing nanotwinned cubic boron nitride (nt-cBN) with a twin thickness down to ~3.8?nm makes it feasible to simultaneously achieve smaller nanosize, ultrahardness and superior thermal stability,” the researchers stated.
Prior to this new research nanograined diamond grain structures were limited to between 10 and 30nm, and had degraded thermal stability compared to natural diamonds.
Now the researchers have created the direct synthesis of nt-diamond with an average twin thickness of ~5nm, using a precursor of onion carbon Nitrides Nanoparticles at high pressure and high temperature, and the observation of a new monoclinic crystalline form of diamond coexisting with nt-diamond.
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While platinum-group metals (PGMs) make the most stable and active catalysts
Hongwu International Group Ltd, with HWNANO brand, is a high-tech enterprise focusing on manufacturing, research, development and processing of nanoparticles,nanopowders, micron powders.
In a paper published recently in the journal Angewandte Chemie, an MIT team has explained a process of synthesizing catalysts made using modified tungsten carbide (WC) Nitrides Nanoparticles as an alternative to platinum.
While platinum-group metals (PGMs) make the most stable and active catalysts, they are unsustainable resources.
In this way, tungsten, with six valence electrons, can be electronically modified to mimic platinum, which has 10 valence electrons, by reacting it with carbon (four valence electrons) to give the ceramic material tungsten carbide. Numerous studies have shown that WC is indeed platinum-like, and able to catalyze important thermo and electrocatalytic reactions that tungsten metal cannot such as biomass conversion, hydrogen evolution, oxygen reduction, and alcohol electrooxidation. Importantly, tungsten is more than three orders of magnitude more abundant than platinum in the Earth’s crust, making it a viable material for a global renewable-energy economy.
The team’s next steps include the synthesis of other bimetallic TMCs, as well as transition metal nitride (TMN) Nitrides Nanoparticles. The team is investigating these materials for other electrocatalytic reactions as well as thermal catalytic reactions, such as hydrodeoxygenation for biomass reforming.
This new method unlocks a broad range of monometallic and heterometallic transition metal carbide and nitride Nitrides Nanoparticles that researchers previously have been unable to synthesize or study,” said Yuriy Rom¨¢n, an assistant professor of chemical engineering who worked on the technology. “While our research focuses mainly on the sustainable replacement of PGMs in thermal and electrocatalytic applications, we also anticipate broader impacts of our new TMC and TMN technologies outside catalysis. Because of their unique chemical, mechanical, and electronic properites, carbides and nitrides have garnered much attention for use in applications as diverse as supercapacitors, medical implants, optoelectronics, coatings, and high-temperature materials for the aerospace and nuclear sectors.”
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These high temperatures cause Nitrides Nanoparticles to sinter into large microparticles with low surface areas
Hongwu International Group Ltd, with HWNANO brand, is a high-tech enterprise focusing on manufacturing, research, development and processing of nanoparticles,nanopowders, micron powders.
However, both WC and platinum are heterogeneous catalysts, meaning that they require nanoparticle formulations to create high surface areas and invoke quantum confinement effects to maximize the rates of chemical reactions. While platinum Nitrides Nanoparticles are relatively easy to synthesize, until now, there have been no known methods to synthesize WC Nitrides Nanoparticles less than 5 nanometers and devoid of surface impurities. Tungsten carbide forms at very high temperatures, typically over 800¡ãC (1500¡ãF). These high temperatures cause Nitrides Nanoparticles to sinter into large microparticles with low surface areas. Methods to date that alleviate this agglomeration instead result in Nitrides Nanoparticles
that are covered with excess surface carbon. These surface impurities greatly reduce, or completely eliminate, the catalytic activity of WC.
To solve this problem, the MIT team developed a ¡°removable ceramic coating method¡± by coating colloidally dispersed transition-metal oxide Nitrides Nanoparticles with microporous silica shells. At high temperatures, they show that reactant gases, such as hydrogen and methane, are able to diffuse through these silica shells and intercalate into the encapsulated metal oxide Nitrides Nanoparticles. This transforms the oxide Nitrides Nanoparticles into transition metal carbide (TMC) Nitrides Nanoparticles, while the silica shells prevent both sintering and excess carbon deposition. The silica shells can then be easily removed at room temperature, allowing the dispersal of nonsintered, metal-terminated TMC Nitrides Nanoparticles onto any high-surface-area catalyst support. This is the first method capable of this result.
The team has also been successful in synthesizing the first nonsintered, metal-terminated bimetallic TMC Nitrides Nanoparticles. Electrocatalytic studies have shown that these materials are able to perform hydrogen evolution and methanol electrooxidation at rates similar to commercial PGM-based catalysts, while maintaining activity over thousands of cycles. The catalytic activities obtained were more than two orders of magnitude better than commercial WC powders and WC Nitrides Nanoparticles made by current state-of-the-art synthesis methods that do not prevent sintering or surface carbon deposition..
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