Hello,

We noticed you're browsing in private or incognito mode.

To continue reading this article, please exit incognito mode or log in.

Not a subscriber? Subscribe now for unlimited access to online articles.

Intelligent Machines

From the Labs: Nanotechnology

New publications, experiments and breakthroughs in nanotechnology–and what they mean.

Super Lens
New nanostructured materials break the old limits of optical lenses

The new lens (top) gathers information about a nanoscale object and then passes it on to a conventional lens.

Source: “Far-Field Optical Hyperlens Magnifying Sub-Diffraction-Limited Objects”
Xiang Zhang et al.
Science 315: 1686

This story is part of our May/June 2007 Issue
See the rest of the issue
Subscribe

Results: Researchers at the University of California, Berkeley, have developed a lens that can resolve details too small for conventional optical microscopes. Using it, they could distinguish two parallel lines 130 nanometers apart; seen through a conventional microscope, the lines looked like a single, thick line.

Why it matters: Light-based devices such as optical microscopes have long been limited to resolving or producing features half the wavelength of the light being used. Thus visible light cannot resolve anything smaller than about 200 nanometers. The new lens could make it possible to observe cellular processes never before seen. It could also be used to project images with extremely fine features, increasing the precision of photolithography or enabling much more data to be crammed onto a DVD.

Methods: The researchers carved a valley shaped like a half-cylinder into a piece of quartz. They then deposited alternating layers of silver and aluminum oxide on the walls of the cylinder. Each layer was just 35 nanometers thick and took the curved shape of the quartz. This arrangement enables the lens to gather more visual information about the object being viewed, which it then passes on to an otherwise conventional microscope.

Next Steps: So far, the lens can be used to view only things in contact with the bottom of its U-shaped valley. It should be possible to build a version of it that does not need to touch the object being viewed.

Self-Assembling Batteries
Batteries that make themselves could serve as tiny power sources in ­micromachines or microelectronics

Source: “Self-Assembling Colloidal-Scale Devices: Selecting and Using Short-Range Surface Forces between Conductive Solids”
Yet-Ming Chiang et al.
Advanced Functional Materials 17(3): 379-389

Results: Thanks to a better understanding of short-range forces between microscopic particles, MIT researchers were able to identify materials that, combined in a solution, will arrange themselves to form a working rechargeable battery. In a prototype, attractive forces cause microscopic carbon particles to aggregate, forming an electrode and attaching to a current collector. Another, preëxisting electrode–a solid slab–repulses the particles, creating the necessary gap between electrodes.

Why it matters: Such materials could self-assemble into form-fitting batteries in electronic devices. The materials could also be used in tiny sensors or micromachines.

Methods: The researchers combined theoretical analysis with precise measurements of the short-range attractive and repulsive forces between particles of different materials. The measurements were made by attaching particles to the tip of an atomic force microscope. The interplay of forces caused the researchers’ chosen materials to sort themselves into a working battery.

Next Steps: To make the battery more rugged, the researchers want to replace the liquid electrolyte used in the prototype with a polymer. Also, future prototypes could use self-­assembling particles for both electrodes, not just one.

Keep up with the latest in intelligent machines at EmTech Digital.

The Countdown has begun.
March 25-26, 2019
San Francisco, CA

Register now
More from Intelligent Machines

Artificial intelligence and robots are transforming how we work and live.

Want more award-winning journalism? Subscribe to Print + All Access Digital.
  • Print + All Access Digital {! insider.prices.print_digital !}*

    {! insider.display.menuOptionsLabel !}

    The best of MIT Technology Review in print and online, plus unlimited access to our online archive, an ad-free web experience, discounts to MIT Technology Review events, and The Download delivered to your email in-box each weekday.

    See details+

    12-month subscription

    Unlimited access to all our daily online news and feature stories

    6 bi-monthly issues of print + digital magazine

    10% discount to MIT Technology Review events

    Access to entire PDF magazine archive dating back to 1899

    Ad-free website experience

    The Download: newsletter delivery each weekday to your inbox

    The MIT Technology Review App

/3
You've read of three free articles this month. for unlimited online access. You've read of three free articles this month. for unlimited online access. This is your last free article this month. for unlimited online access. You've read all your free articles this month. for unlimited online access. You've read of three free articles this month. for more, or for unlimited online access. for two more free articles, or for unlimited online access.