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Archive for the 'Research' Category

Atomically-precise positioning of a single atom transistor-VIDEO

Posted by Jim Lewis on February 19th, 2012

Researchers in Australia and the US have demonstrated a working transistor by placing of single atom of phosphorous with atomic precision between gates made of wires only a few phosphorous atoms wide. This demonstration points to possibly extending current computer technology to the atomic scale.

Graphene heterostructures may lead to graphene-based computer chips

Posted by Jim Lewis on February 12th, 2012

A field-effect tunneling transistor comprising a vertical heterostructure of atomically thin layers of graphene and boron nitride or molybdenum disulfide may pave the way for computer chips based on graphene nanotechnology.

DNA motor navigates network of DNA tracks

Posted by Jim Lewis on January 31st, 2012

Scientists at Kyoto University and the University of Oxford have combined DNA origami and DNA motors to take another step toward programmed artificial molecular assembly lines.

Crowd-sourced protein design a promising path to advanced nanotechnology

Posted by Jim Lewis on January 24th, 2012

Foldit game players have again out-performed scientists in protein design, this time improving the design of a protein designed from scratch to catalyze Diels-Alder cycloadditions.

Magnetic storage systems shrink from a million atoms per bit to twelve

Posted by Jim Lewis on January 13th, 2012

An array of 96 iron atoms on a copper nitride surface, assembled using an STM and used to write a byte, demonstrates how small magnetic storage could shrink and may lead to novel nanomaterials for quantum computers.

First Master's of Science in Nanomedicine degree program in US announced

Posted by Jim Lewis on January 6th, 2012

The first Master’s of Science in Nanomedicine degree program in US is announced. As an example of the rapidly developing potential of nanomedicine, a novel type of nanoparticle succeeded in two different mouse models in destroying a type of brain cancer that had previously been completely resistant to all treatment attempts.

Artificial molecular motor controls molecular transformation

Posted by Jim Lewis on December 30th, 2011

A four-step unidirectional molecular motor driven by light and temperature changes catalyzes different chemical reactions at different steps of its rotary cycle.

RNA CAD tool for synthetic biology may facilitate RNA nanotechnology

Posted by Jim Lewis on December 27th, 2011

RNA CAD tools developed for RNA-regulated control of gene expression in synthetic biology successfully engineered metabolic pathways in bacteria. Will engineering RNA-based genetic control systems lead to design tools for other RNA-based molecular machine systems?

Mechanical pressure produces atomically-precise, multifunctional 2D sheets

Posted by Jim Lewis on December 26th, 2011

Protein-like structures called peptoids can be formed into stable, free-floating nanosheets.

A molecular switch with a single proton switched by a single electron

Posted by Jim Lewis on December 19th, 2011

How small could a molecular switch be made? It is difficult to think of one smaller than the single proton switch just demonstrated by this group in Germany.

Turning nanoparticles into multicomponent three-dimensional nanostructures

Posted by Jim Lewis on December 12th, 2011

Controlling the chemical processes of corrosion and plating at the nanoscale has been used to fabricate from inorganic nanoparticles complex three-dimensional objects with hollow interiors.

New light-sensitive polymer to control drug release from nanoparticles

Posted by Jim Lewis on December 4th, 2011

A new polymer that disintegrates in response to harmless radiation that can penetrate several inches into human tissue may lead to nanoparticles that release their drug cargo only at a desired time and place.

Will new piezoelectric materials lead to new tools for nanotechnology?

Posted by Jim Lewis on November 27th, 2011

Will the integration of a single-crystal material with “giant” piezoelectric properties onto silicon make possible scanning probe microscopes on a chip?

Geometry of DNA nanostructures used to program molecular recognition

Posted by Jim Lewis on November 25th, 2011

Adding a new molecular recognition code to structural DNA nanotechnology—a pattern of projecting and recessed blunt-end DNA helices can be used to code the assembly of DNA origami tiles into larger DNA nanostructures.

DNA nanosensors profile gene activity to reveal state of cells

Posted by Jim Lewis on November 18th, 2011

Small DNA molecules fluoresce in the presence of specific transcription factors, sensing which genes are being expressed in that cell, potentially allowing cancer treatments to be personalized, and the quality of stem cells to be monitored.

Leveraging nanoforces to increase biosensor sensitivity

Posted by Jim Lewis on November 16th, 2011

This contribution has been forwarded by Ivo Rivetta. The primary forces on the nanometer scale are scaled versions of what we experience on a day to day basis. Instead of gravity, surface forces such as water tension and electric charge dominate. As an example, compare wet basketballs and wet sand. The weight of the basketballs [...]

Single molecule nanocar with functional wheels driven by electron tunneling

Posted by Jim Lewis on November 14th, 2011

Electron tunneling drives a conformational change in each wheel of a four-wheel drive, single molecule nanocar, driving it across a copper surface.

An artificial molecular clock to control artificial molecular machines

Posted by Jim Lewis on November 4th, 2011

The oscillating synthesis and degradation of regulatory RNA molecules was used to produce a molecular clock to control the opening and closing of a DNA tweezers, and also to control the production of another RNA molecule to alter the fluorescence of a dye molecule.

Carbon nanotube muscles could propel future medical nanorobots (video)

Posted by Jim Lewis on October 31st, 2011

Yarn woven from carbon nanotubes provides a thousand times more rotation than is obtained from other artificial muscles, and could be made into motors to provide propulsion for micrometer-sized medical nanorobots.

Using DNA as bonds to build new materials from nanoparticles

Posted by Jim Lewis on October 31st, 2011

Varying the length of the DNA used to connect the nanoparticles provides for a wide variety of nanoparticle sizes and crystal symmetries.