Lifeboat Foundation: Safeguarding Humanity
Toggle light / dark theme

Blog

Category: nanotechnology – Page 202

Dr yu shrike zhang phd is assistant professor at harvard medical school and associate bioengineer at brigham and women’s hospital.

Dr. Zhang’s research interests include symbiotic tissue engineering, 3D bio-printing, organ-on-a-chip technology, biomaterials, regenerative engineering, bioanalysis, nanomedicine, and biology.

His scientific contributions have been recognized by over 40 regional, national and international awards. He has been invited to deliver more than 110 lectures worldwide, and has served as reviewer for more than 500 manuscripts for as many as 50 journals.

Dr. Zhang is serving as Editor-in-Chief for Microphysiological Systems, and is Associate Editor for Bio-Design and Manufacturing, Nano Select, Aggregate, and Essays in Biochemistry.

He is also on the Editorial Board of Biofabrication, Bioprinting, Advanced Healthcare Materials, Discover Materials, BMC Biomedical Engineering, Materials Today Bio, and Chinese Chemical Letters, the Editorial Advisory Board of Heliyon and Biomicrofluidics, the International Advisory Board of Advanced NanoBiomed Research and Advanced Materials Technologies, and the Advisory Panel of Nanotechnology.

Dr. Zhang has his PhD in Biomedical Engineering from Georgia Institute of Technology / Emory, his M.S. in Bioengineering and Biomedical Engineering from Washington University in St. Louis, and his B.Eng. in Biomedical Engineering Southeast University in China.

Continue reading “Dr. Yu Shrike Zhang — Symbiotic Tissue Engineering — Harvard Medical School” | >

A new label-free optical imaging technique based on unscattered light can detect nanoparticles as small as 25 nm in diameter. The technology overcomes several limitations of other advanced methods for imaging tiny particles, and its developers at the University of Houston and the University of Texas M D Anderson Cancer Center in the US say it might be used to study viruses and other structures at the molecular level.

Imaging nanoscale objects via optical techniques is difficult for two reasons. First, the objects’ small size means that they scatter little light, making it hard to distinguish them from the background. Second, individual nano-objects within a close-packed group tend to be separated by distances that are smaller than the diffraction limit for visible light (around a few hundred nanometres) making it impossible to resolve them with conventional methods.

Read more | >

In groundbreaking new research, an international team of researchers led by the University of Minnesota Twin Cities has developed a unique process for producing a quantum state that is part light and part matter.

The discovery provides fundamental new insights for more efficiently developing the next generation of quantum-based optical and electronic devices. The research could also have an impact on increasing efficiency of nanoscale chemical reactions.

The research is published in Nature Photonics.

Read more | >

Serena Corr looks at the science behind batteries, discusses why we are hunting for new ones and investigates what tools we use to pave this pathway to discovery.
Watch the Q&A: https://youtu.be/lZjqiR0czLo.

The hunt is on for the next generation of batteries that will power our electric vehicles and help our transition to a renewables-led future. Serena shows how researchers at the Faraday Institution are developing new chemistries and manufacturing processes to deliver safer, cheaper, and longer-lasting batteries and provide higher power or energy densities for electric vehicles.

Serena Corr is a Chair in Functional Materials and Professor in Chemical and Biological Engineering at the University of Sheffield. She works on next-generation battery materials and advanced characterisation techniques for nanomaterials.

This event was generously supported by The Faraday Institution.

–
A very special thank you to our Patreon supporters who help make these videos happen, especially:
János Fekete, Mehdi Razavi, Mark Barden, Taylor Hornby, Rasiel Suarez, Stephan Giersche, William Billy Robillard, Scott Edwardsen, Jeffrey Schweitzer, Gou Ranon, Christina Baum, Frances Dunne, jonas.app, Tim Karr, Adam Leos, Andrew Weir, Michelle J. Zamarron, Andrew Downing, Fairleigh McGill, Alan Latteri, David Crowner, Matt Townsend, Anonymous, Andrew McGhee, Roger Shaw, Robert Reinecke, Paul Brown, Lasse T. Stendan, David Schick, Joe Godenzi, Dave Ostler, Osian Gwyn Williams, David Lindo, Roger Baker, Greg Nagel, and Rebecca Pan.
–

The Ri is on Patreon: https://www.patreon.com/TheRoyalInstitution.

Continue reading “The Hunt for New Batteries — with Serena Corr” | >

Columbia team discovers 6-nanometer-long single-molecule circuit with enormous on/off ratio due to quantum interference; finding could enable faster, smaller, and more energy-efficient devices.

Researchers, led by Columbia Engineering Professor Latha Venkataraman, report today that they have discovered a new chemical design principle for exploiting destructive quantum interference. They used their approach to create a six-nanometer single-molecule switch where the on-state current is more than 10,000 times greater than the off-state current–the largest change in current achieved for a single-molecule circuit to date.

This new switch relies on a type of quantum interference that has not, up to now, been explored. The researchers used long molecules with a special central unit to enhance destructive quantum interference between different electronic energy levels. They demonstrated that their approach can be used to produce very stable and reproducible single-molecule switches at room temperature that can carry currents exceeding 0.1 microamps in the on-state. The length of the switch is similar to the size of the smallest computer chips currently on the market and its properties approach those of commercial switches. The study is published today in Nature Nanotechnology.

Read more | >

A 15-year-old Colorado high school student and young scientist who has used artificial intelligence and created apps to tackle contaminated drinking water, cyberbullying, opioid addiction and other social problems has been named Time Magazine’s first-ever “Kid of the Year.”

Gitanjali Rao, a sophomore at STEM School Highlands Ranch in suburban Denver who lives in the city of Lone Tree, was selected from more than 5,000 nominees in a process that culminated with a finalists’ committee of children, drinking in Flint, Michigan, inspired her work to develop a way to detect contaminants and send those results to a mobile phone, she said.

“I was like 10 when I told my parents that I wanted to research carbon nanotube sensor technology at the Denver Water quality research lab, and my mom was like, ” A what?” Rao told Jolie. She said that work ” is going to be in our generation’s hands pretty soon. So if no one else is gonna do it, I’m gonna do it.”

Read more | >

Graphene, an atomically thin carbon layer through which electrons can travel virtually unimpeded, has been extensively studied since its first successful isolation more than 15 years ago. Among its many unique properties is the ability to support highly confined electromagnetic waves coupled to oscillations of electronic charge—plasmon polaritons—that have potentially broad applications in nanotechnology, including biosensing, quantum information, and solar energy.

However, in order to support , must be charged by applying a voltage to a nearby metal gate, which greatly increases the size and complexity of nanoscale devices. Columbia University researchers report that they have achieved plasmonically active graphene with record-high charge density without an external gate. They accomplished this by exploiting novel interlayer charge transfer with a two-dimensional electron-acceptor known as α-RuCl3. The study is available now online as an open access article and will appear in the December 9th issue of Nano Letters.

“This work allows us to use graphene as a plasmonic material without metal gates or voltage sources, making it possible to create stand-alone graphene plasmonic structures for the first time” said co-PI James Hone, Wang Fong-Jen Professor of Mechanical Engineering at Columbia Engineering.

Read more | >

“The newest term — Universal Basic Means of Production — helps someone unfamiliar with the concepts to better imagine that world without clouding the idea with negative connotations from the past. So, what if instead of focusing so heavily on the idea of passing out money to individuals, we shift our focus to subsidizing 3D printers, local recycling centers for collecting plastic to make 3D printing filament when possible, and vertical gardens in homes and communities.”

Imagine a carbon nanotube replicator and garden in every home. It’s not sci-fi and will soon be possible. How fast we make the transition is entirely up to us.

This term refers to the idea of providing every household with technology that allows people to produce things they need at home. This includes consumer goods such as clothes, food, building materials, etc. and refers to the idea of getting everyone producing as many of their consumable materials as possible.

In many ways, we can think of it as creating a decentralized means of production, although it’s not entirely decentralized. And when you get right down to it, the whole point of a decentralized means of production is people working together to produce things they need. Not just some corporate “shareholder value” conference.

Read more | >

There are several ways to generate power from that mixing. And a couple of blue energy power plants have been built. But their high cost has prevented widespread adoption. All blue energy approaches rely on the fact that salts are composed of ions, or chemicals that harbor a positive or negative charge. In solids, the positive and negative charges attract one another, binding the ions together. (Table salt, for example, is a compound made from positively charged sodium ions bound to negatively charged chloride ions.) In water, these ions detach and can move independently.

By pumping the positive ions—like sodium or potassium—to the other side of a semipermeable membrane, researchers can create two pools of water: one with a positive charge, and one with a negative charge. If they then dunk electrodes in the pools and connect them with a wire, electrons will flow from the negatively charged to the positively charged side, generating electricity.

In 2013, French researchers made just such a membrane. They used a ceramic film of silicon nitride—commonly used in industry for electronics, cutting tools, and other uses—pierced by a single pore lined with a boron nitride nanotube (BNNT), a material being investigated for use in high-strength composites, among other things. Because BNNTs are highly negatively charged, the French team suspected they would prevent negatively charged ions in water from passing through the membrane (because similar electric charges repel one another). Their hunch was right. They found that when a membrane with a single BNNT was placed between fresh- and saltwater, the positive ions zipped from the salty side to the fresh side, but the negatively charged ions were mostly blocked.

Read more | >

Scientists at Osaka University develop a label-free method for identifying respiratory viruses based on changes in electrical current when they pass through silicon nanopores, which may lead to new rapid COVID-19 tests.

The ongoing global pandemic has created an urgent need for rapid tests that can diagnose the presence of the SARS-CoV-2 virus, the pathogen that causes COVID-19, and distinguish it from other respiratory viruses. Now, researchers from Japan have demonstrated a new system for single-virion identification of common respiratory pathogens using a machine learning algorithm trained on changes in current across silicon nanopores. This work may lead to fast and accurate screening tests for diseases like COVID-19 and influenza.

In a study published this month in ACS Sensors scientists at Osaka University have introduced a new system using silicon nanopores sensitive enough to detect even a single virus particle when coupled with a machine learning algorithm.

Read more | >