Category Archives: Nanotechnology

Virus-Assembled Batteries

Virus coated polymer dipped in battery material

Virus-Assembled Batteries by Kevin Bullis:

More than half the weight and size of today’s batteries comes from supporting materials that contribute nothing to storing energy. Now researchers have demonstrated that genetically engineered viruses can assemble active battery materials into a compact, regular structure, to make an ultra-thin, transparent battery electrode that stores nearly three times as much energy as those in today’s lithium-ion batteries. It is the first step toward high-capacity, self-assembling batteries.
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One of the ways they have done this in the past is using a process called “directed evolution.” They combine collections of viruses with millions of random variations in a vial containing a piece of the material they want the virus to bind to. Some of the viruses happen to have proteins that bind to the material. Isolating these viruses is a simple process of washing off the piece of material –only those viruses bound to the material remain. These can then be allowed to reproduce. After a few rounds of binding and washing, only viruses with the highest affinity for the material remain.

Nanotech Product Recalled in Germany

Nanotech Product Recalled in Germany by Rick Weiss

At least 77 people reported severe respiratory problems over a one-week period at the end of March — including six who were hospitalized with pulmonary edema, or fluid in the lungs — after using a “Magic Nano” bathroom cleansing product, according to the Federal Institute for Risk Assessment in Berlin.

Symptoms generally cleared up within 18 hours, though some had persistent breathing problems for days.

On Nanotechnology in general:

Studies of health effects have just begun in several countries, and regulatory agencies are still formulating their stances, but hundreds of nano products are already for sale.

It was unclear yesterday what kind of nanomaterial is in the spray, or even whether the particles were to blame. Every case has involved the aerosol spray-can form (the product was previously available in a pump bottle, without complications). And the propellant used in the aerosol has long been used uneventfully in hair sprays and other products.

MIT Energy Storage Using Carbon Nanotubes

Images of different types of carbon nanotubes

MIT Researchers Fired up Over New Battery

Image / Michael Ströck, Images of different types of carbon nanotubes. Carbon nanotubes are key to MIT researchers’ efforts to improve on an energy storage device called an ultracapacitor. Larger image

Work at MIT’s Laboratory for Electromagnetic and Electronic Systems (LEES) holds out the promise of the first technologically significant and economically viable alternative to conventional batteries in more than 200 years.
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The LEES ultracapacitor has the capacity to overcome this energy limitation by using vertically aligned, single-wall carbon nanotubes — one thirty-thousandth the diameter of a human hair and 100,000 times as long as they are wide. How does it work? Storage capacity in an ultracapacitor is proportional to the surface area of the electrodes. Today’s ultracapacitors use electrodes made of activated carbon, which is extremely porous and therefore has a very large surface area. However, the pores in the carbon are irregular in size and shape, which reduces efficiency. The vertically aligned nanotubes in the LEES ultracapacitor have a regular shape, and a size that is only several atomic diameters in width. The result is a significantly more effective surface area, which equates to significantly increased storage capacity.

Building Nanotechnological Structures

New Nanotechnological Structures Reported for the First Time by Alex Lyda, Columbia News:

“You can think of nanocrystals as building blocks like the toy Lego, in which a larger structure can be assembled by locking in the pieces according to their shape and the way they prefer to join to each other,” O’Brien says. “Except all of this is on an incredibly small lengthscale — billionths of a meter.”

The Columbia/IBM team has borrowed ideas from the natural world, in which the right conditions can stimulate the slow growth of highly uniform structures out of miniature building blocks. Opals are an example of this phenomenon: opals consist of tiny spherical building blocks of silica packed into an ordered structure. In this new research, the materials used as building blocks are a variety of man-made nanocrystals with known useful magnetic or electronic properties.

“This work may lead to the development of an entirely new class of multifunctional materials in which there are cooperative interactions between the nanocrystal components,” says MRSEC director Irving P. Herman, also a professor of applied physics. “Moreover, the properties of these nanocrystals can be tailored during synthesis, and they can be deposited to form the desired ordered array by controlling particle charge and other properties. O’Brien’s study also demonstrates the value of vibrant collaborations between universities and industry.”

Video: Magnetic and Semiconducting Nanocrystals Can Self-Assemble, Says Stephen O’Brien, Columbia University

Self-Assembling Cubes Could Deliver Medicine

Nanocubes photos

Tiny Self-Assembling Cubes Could Carry Medicine, Cell Therapy – News Release from Johns Hopkins (pdf format)

Details of photos: “Scanning electron microscopy images of image of (A) a hollow, open surfaced, biocontainer, and (B) a device loaded with glass microbeads. (C) Fluorescence microscopy images of a biocontainer loaded with cell-ECM-agarose with the cell viability stain, Calcein-AM. (D) Release of viable cells from the biocontainer.”

Johns Hopkins researchers have devised a self- assembling cube-shaped perforated container, no larger than a dust speck, that could serve as a delivery system for medications and cell therapy.

When the process is completed, they form a perforated cube. When the solution is cooled, the solder hardens again, and the containers remain in their box-like shape.

“To make sure it folds itself exactly into a cube, we have to engineer the hinges very precisely,” Gracias said. “The self-assembly technique allows us to make a large number of these microcontainers at the same time and at a relatively low cost.”

Gracias and his colleagues used micropipettes to insert into the cubes a suspension containing microbeads that are commonly used in cell therapy. The lab team showed that these beads could be released from the cubes through agitation. The researchers also inserted human cells, similar to the type used in medical therapy, into the cubes. A positive stain test showed that these cells remained alive in the microcontainers and could easily be released.

And they are “always on the lookout for exceptional and highly creative undergraduate, graduate students and post-doctoral candidates” – maybe you.

Nanotechnology Research

Nanotech’s super salesman by Darin Barney, Globe and Mail (Canada), review of
The Dance of Molecules: How Nanotechnology is Changing Our Lives by Ted Sargent.:

As one might expect, the biggest prizes are medical. Nanoscale “chips that merge computer technologies with cells and genes and proteins” will act as early warning beacons in the detection of cancer and Alzheimer’s disease. Spread of these diseases will be checked at the earliest stages by pharmacies on a chip, implanted in our bodies and programmed remotely by our physician’s cellphone to deliver “a veritable cocktail of drugs.” And if this doesn’t work (or even if we are just overcome by “our unquenchable thirst for self-improvement”), nanoscale tissue engineering will provide a ready supply of replacement parts.

Panel looks at ways to clean up nanotech’s act:

But nanotech may also introduce unwanted side effects that, if not managed effectively, might prompt bans on useful nanomaterials.

Nanotech pioneers can look at asbestos and DDT as examples of materials that solved critical long-standing problems, but caused health and environmental problems so severe as to nullify the materials’ benefits. Nanotechnology is setting out on the same road, promising effective medical treatments and “miracle” consumer products, but also posing threats that must be neutralized if the technology is to be accepted.

Nanotechnology provides great promise. The dangers cannot be ignored, however. Managing those dangers is not an easy task. Those promoting moving forward quickly often ignore potential problems. And given the way the scientific and engineering landscape is changing worldwide, if any country creates to many barriers to research that research will likely move elsewhere, along with many high paying jobs.

Nanotechnology Education

photo of quantum dots
Bin Yang grows quantum dots (the arrows point to them) as part of his nanotechnology research.

Exploring the Nanoworld from the University of Wisconsin – Madison.

The web site aims to “brings the “wow” and potential of nanotechnology and advanced materials to the public.” I think they still have quite a bit of work to do to reach that goal. It is good to see some effort made to do this but I hope we can do much better.

And this is the best sites I looked at today. All the sites were funded by the NSF as education and outreach efforts. They really need to do a much better job with this outreach. I believe we need to spend money to improve education and outreach but we need to do so in a way that is much more engaging.

We need material teachers can use to engage students.

Video podcast on UW Engineering nanotechnology lab

Catalyzing Nanotechnology

image synthetic and biological catalysts
Catalyzing Nanotechnology by David Pescovitz, ScienceMatters@Berkeley.

The researchers have also explored a method to imprint bulk silica with particle templates as large as 15 nanometers. Rather than organize several functional groups at a time, the synthesis of nanoparticle building blocks for bulk silica imprinting is ideal for organizing thousands of functional groups at once, Katz says.

This slide depicts the synthetic and biological catalysts consisting of similar organic and organometallic active sites. The confined environment surrounding both biological catalysts results from the hydrophobic interior of the enzyme. The researchers successfully replicated this confinement in the synthetic equivalents of the biological active sites shown on the right side of this figure. (courtesy the researchers)

Related: nanotechnology posts

Nanoscale Science and Engineering Education

Nanoscale Science and Engineering Education projects funded by the National Science Foundation (NSF).

Abstracts for programs funded given by NSF.

For example How Do We Know What We Know? Resources for the Public Understanding of Scientific Evidence,

This project is designed to improve communication between scientists and the public focusing on the role of evidence in science. It is a two-year project that includes: 1) implementing a national survey on the public use of science web sites; 2) conducting a national Science Education Outreach Forum bringing together scientists and informal science educators; 3) implementing workshop sessions at a national conference to disseminate lessons learned from the survey and Forum; and 4) developing a prototype website on the role of evidence that will be evaluated for audience engagement and understanding.

This project builds on the Exploratorium’s prior NSF-funded project (ESI#9980619) developing innovative strategies using the Internet to link scientists and the public using Webcasts, annotated datasets and interactive web resources. Project collaborators include the Pew Internet and American Life Project, Palmer Station, Scripps Oceanographic Institute, FermiLab and the Society of Hispanic Physicists among others. The research and evaluation of the project has the potential for strategic impact by providing new information and models on how science centers can more effectively use the Internet to improve communication between scientists and the public while engaging learners more effectively.

Nano Printing

New technique may speed DNA analysis:

In the new printing method, called Supramolecular Nano-Stamping (SuNS), single strands of DNA essentially self-assemble upon a surface to duplicate a nano-scale pattern made of their complementary DNA strands. The duplicates are identical to the master and can thus be used as masters themselves. This increases print output exponentially while enabling the reproduction of very complex nano-scale patterns.