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Archive for the ‘nanotechnology’ category: Page 4

Jun 14, 2020

Nano-sized diamond thread may be a super-strong wonder material

Posted by in categories: materials, nanotechnology

Circa 2015


Move over, graphene — you’re not the only miracle material in town. Australian researchers have discovered that diamond nanothreads (one-dimensional diamond crystals capped with hydrogen) could be extremely strong. While scientists thought they were brittle when announced just a month ago, it turns out that they become supremely flexible (and thus durable) when you introduce the right kinds of defects. You could create nanoscopic structures that are just as strong as you need them to be, with a ‘perfect’ mix of bendy and rigid shapes.

Jun 13, 2020

Carbon nanotube transistors make the leap from lab to factory floor

Posted by in categories: computing, nanotechnology

The next major revolution in computer chip technology is now a step closer to reality. Researchers have shown that carbon nanotube transistors can be made rapidly in commercial facilities, with the same equipment used to manufacture traditional silicon-based transistors – the backbone of today’s computing industry.

Jun 13, 2020

New Bionic Eye Might See Better Than We Do

Posted by in categories: biotech/medical, cyborgs, nanotechnology, transhumanism

The ability to restore sight to the blind is one of the most profound acts of healing medicine can achieve, in terms of the impact on the affected patient’s life — and one of the most difficult for modern medicine to achieve. We can restore vision in a limited number of scenarios and there are some early bionic eyes on the market that can restore limited vision in very specific scenarios. Researchers may have taken a dramatic step towards changing that in the future, with the results of a new experiment to design a bionic retina.

The research team in question has published a paper in Nature detailing the construction of a hemispherical retina built out of high-density nanowires. The spherical shape of the retina has historically been a major challenge for biomimetic devices.

EyeComparison

Jun 12, 2020

Advanced nanotechnology to improve success of dental implants

Posted by in categories: biotech/medical, nanotechnology

A technological advancement that may prove crucial in the long-term success of dental implants has been developed by University of Queensland researchers.

Dr. Karan Gulati, NHMRC Early Career Fellow from the UQ School of Dentistry, said modifying with ‘nanopores’ will help protect against one of the leading causes of failure.

“Poor integration between the implant and the surrounding tissue is one of the leading causes of dental implant failure,” Dr. Gulati said. “If the sealing between the implant and the surrounding gum tissue fails it can result in bacteria entering the implant and causing infection.”

Jun 10, 2020

Machine learning predicts nanoparticle structure and dynamics

Posted by in categories: biotech/medical, chemistry, nanotechnology, robotics/AI, supercomputing

Researchers at the Nanoscience Center and at the Faculty of Information Technology at the University of Jyväskylä in Finland have demonstrated that new distance-based machine learning methods developed at the University of Jyväskylä are capable of predicting structures and atomic dynamics of nanoparticles reliably. The new methods are significantly faster than traditional simulation methods used for nanoparticle research and will facilitate more efficient explorations of particle-particle reactions and particles’ functionality in their environment. The study was published in a Special Issue devoted to machine learning in the Journal of Physical Chemistry on May 15, 2020.

The new methods were applied to ligand-stabilized metal , which have been long studied at the Nanoscience Center at the University of Jyväskylä. Last year, the researchers published a method that is able to successfully predict binding sites of the stabilizing ligand molecules on the nanoparticle surface. Now, a new tool was created that can reliably predict based on the atomic structure of the particle, without the need to use numerically heavy electronic structure computations. The tool facilitates Monte Carlo simulations of the atom dynamics of the particles at elevated temperatures.

Potential energy of a system is a fundamental quantity in computational nanoscience, since it allows for quantitative evaluations of system’s stability, rates of chemical reactions and strengths of interatomic bonds. Ligand-stabilized metal nanoparticles have many types of interatomic bonds of varying chemical strength, and traditionally the energy evaluations have been done by using the so-called density functional theory (DFT) that often results in numerically heavy computations requiring the use of supercomputers. This has precluded efficient simulations to understand nanoparticles’ functionalities, e.g., as catalysts, or interactions with biological objects such as proteins, viruses, or DNA. Machine learning methods, once trained to model the systems reliably, can speed up the simulations by several orders of magnitude.

Jun 10, 2020

Researchers mimic nature for fast, colorful 3D printing

Posted by in categories: 3D printing, nanotechnology

Brilliantly colored chameleons, butterflies, opals—and now some 3D-printed materials—reflect color by using nanoscale structures called photonic crystals.

A new study that demonstrates how a modified 3D-printing process provides a versatile approach to producing multiple colors from a single ink is published in the journal Science Advances.

Continue reading “Researchers mimic nature for fast, colorful 3D printing” »

Jun 10, 2020

A route to the directional control of light–matter interactions at the nanoscale

Posted by in categories: computing, mobile phones, nanotechnology, quantum physics

Mobile phones and computers are currently responsible for up to 8% of the electricity use in the world. This figure has been doubling each past decade but nothing prevents it from skyrocketing in the future. Unless we find a way for boosting energy efficiency in information and communications technology, that is. An international team of researchers, including Ikerbasque Research Associate Alexey Nikitin (DIPC), has just published in Nature 1 a breakthrough in quantum physics that could deliver exactly that: electronics and communications technology with ultralow energy consumption.

Future information and communication technologies will rely on the manipulation of not only electrons but also of light at the nanometer-scale. Squeezing light to such a small size has been a major goal in nanophotonics for many years. Particularly strong light squeezing can be achieved with polaritons, quasiparticles resulting from the strong coupling of photons with a dipole-carrying excitation, at infrared frequencies in two-dimensional materials, such as graphene and hexagonal boron nitride. Polaritons can be found in materials consisting of two-dimensional layers bound by weak van der Waals forces, the so-called van der Waals materials. These polaritons can be tuned by electric fields or by adjusting the material thickness, leading to applications including nanolasers, tunable infrared and terahertz detectors, and molecular sensors.

But there is a major problem: even though polaritons can have long lifetimes, they have always been found to propagate along all directions (isotropic) of the material surface, thereby losing energy quite fast, which limits their application potential.

Continue reading “A route to the directional control of light–matter interactions at the nanoscale” »

Jun 9, 2020

Moderna: Category: RNA, VAX

Posted by in categories: biotech/medical, nanotechnology

Type: Novel lipid nanoparticle (LNP)-encapsulated mRNA vaccine encoding for a prefusion stabilized form of the Spike (S) protein.

Status: Moderna said May 29 the first patients in both cohorts were dosed in the company’s Phase II trial (NCT04405076) assessing mRNA-1273. The study is designed to evaluate the safety, reactogenicity and immunogenicity of two vaccinations of mRNA-1273, given 28 days apart. plans to enroll 600 healthy participants across two cohorts: 300 adults ages 18–55 years, and 300 ages 55 years and up. Participants will be assigned to placebo, a 50 μg or a 100 μg dose at both vaccinations, and will be followed through 12 months after the second vaccination.

Jun 8, 2020

New tool helps nanorods stand out

Posted by in category: nanotechnology

Rice University scientists have developed an easy and affordable tool to count and characterize nanoparticles.

Jun 8, 2020

Scientists Create Tiniest Semiconductor Laser – 3,000 Times Smaller Than a Millimeter

Posted by in categories: nanotechnology, quantum physics

Scientists create smallest semiconductor laser that works in visible range at room temperature.

An international team of researchers led by researchers from ITMO University announced the development of the world’s most compact semiconductor laser that works in the visible range at room temperature. According to the authors of the research, the laser is a nanoparticle of only 310 nanometers in size (which is 3,000 times less than a millimeter) that can produce green coherent light at room temperature. The research article was published in ACS Nano.

This year, the international community of optical physicists celebrates the anniversary of a milestone event: 60 years ago, in the middle of May, American physicist Theodor Maiman demonstrated the operation of the first optical quantum generator — a laser. Now, Sixty years later, an international team of scientists published a work where they demonstrated experimentally the world’s most compact semiconductor laser that operates in the visible range at room temperature. This means that the coherent green light that it produces can be easily registered and even seen by a naked eye using a standard optical microscope.

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