Chemists create two-armed nanorobotic device to maneuver world's tiniest particles

Feb 15, 2009

Chemists at New York University and China's Nanjing University have developed a two-armed nanorobotic device that can manipulate molecules within a device built from DNA. The device is described in the latest issue of the journal Nature Nanotechnology.

"The aim of nanotechnology is to put specific atomic and molecular species where we want them and when we want them there," said NYU Chemistry Professor Nadrian Seeman, one of the co-authors. "This is a programmable unit that allows researchers to capture and maneuver patterns on a scale that is unprecedented."

The device is approximately 150 x 50 x 8 nanometers. A nanometer is one billionth of a meter. Put another way, if a nanometer were the size of a normal apple, measuring approximately 10 centimeters in diameter, a normal apple, enlarged proportionally, would be roughly the size of the earth.

The creation enhances Seeman's earlier work—a single nanorobotic arm, completed in 2006, marking the first time scientists had been able to employ a functional nanotechnology device within a DNA array.

The new, two-armed device employs DNA origami, a method unveiled in 2006 that uses a few hundred short DNA strands to direct a very long DNA strand to form structures that adopt any desired shape. These shapes, approximately 100 nanometers in diameter, are eight times larger and three times more complex than what could be created within a simple crystalline DNA array.

As with Seeman's previous creation, the two-armed nanorobotic device enables the creation of new DNA structures, thereby potentially serving as a factory for assembling the building blocks of new materials. With this capability, it has the potential to develop new synthetic fibers, advance the encryption of information, and improve DNA-scaffolded computer assembly.

In the two-armed nanorobotic device, the arms face each other, ready to capture molecules that make up a DNA sequence. Using set strands that bind to its molecules, the arms are then able to change the structure of the device. This changes the sticky ends available to capture a new pattern component.

The researchers note that the device performs with 100 percent accuracy. Earlier trials revealed that it captured targeted molecules only 60 to 80 percent of the time. But by heating the device in the presence of the correct species, they found that the arms captured the targeted molecules 100 percent of the time.

They confirmed their results by atomic force microscopy (AFM), which permits features that are a few billionths of a meter to be visualized.

Source: New York University

Explore further: New nanogenerator harvests power from rolling tires

Related Stories

Future biosensors could be woven into clothes

12 hours ago

Commonly used health tests, such as pregnancy and blood sugar tests, involve putting a drop of fluid on a test strip, which is infused with a substance designed to detect a specific molecule.

Research simplifies recycling of rare-earth magnets

Jun 18, 2015

Despite their ubiquity in consumer electronics, rare-earth metals are, as their name suggests, hard to come by. Mining and purifying them is an expensive, labor-intensive and ecologically devastating process.

Recommended for you

Nanowires could be the LEDs of the future

Jun 24, 2015

The latest research from the Niels Bohr Institute shows that LEDs made from nanowires will use less energy and provide better light. The researchers studied nanowires using X-ray microscopy and with this ...

Researchers detect spin precession in silicon nanowires

Jun 24, 2015

Scientists at the U.S. Naval Research Laboratory (NRL) have reported the first observation of spin precession of spin currents flowing in a silicon nanowire (NW) transport channel, and determined spin lifetimes ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.