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Archive for the 'Molecular Nanotechnology' Category

Re-engineering a junction to give a new twist to DNA nanotechnology

Posted by Jim Lewis on March 29th, 2013

By forcing the geometry of the junctions upon which DNA nanotechnology depends, researchers have increased the collection of 2D and 3D structures that they can build to include wire frames and mesh structures.

Proposed Brain Activity Map may also advance nanotechnology

Posted by Jim Lewis on March 1st, 2013

A proposed large project to produce a dynamic map of the functional connectome of the human brain will require a convergence of neuroscience, biotechnology, nanotechnology, and computation, and may therefore spur the development of advanced nanotechnology leading to molecular manufacturing.

Christine Peterson on pushing the future in a positive direction

Posted by Jim Lewis on February 20th, 2013

In a 47-minute interview Christine Peterson discusses the future that science and technology is bringing over the next few decades, and how to get involved to push the future in a positive direction.

Christine Peterson interviewed on nanotechnology

Posted by Jim Lewis on February 12th, 2013

An interview with Foresight Co-Founder and Past President Christine Peterson covering both the current state and the future prospects of nanotechnology is available on Youtube.

Toward molecular fabrication: formation of distinct bond types by STM

Posted by Stephanie C on February 8th, 2013

Scanning probe manipulation of individual atoms and small molecules were amongst the early laboratory successes that helped bring broad scale attention to the feasibility and potential of nanoscale technologies, especially molecular fabrication. Basic manipulations of atoms and bonds by scanning probe have become familiar capabilities that follow similar protocols: the STM tip is precisely positioned [...]

Synthetic biology industrial revolution inspires hope for molecular manufacturing

Posted by Jim Lewis on February 2nd, 2013

A demonstration that most fundamental biological processes can be implemented in a test tube as efficiently as in live bacteria provides synthetic biology the tools to create a ‘new industrial revolution’, which may or may not lead to more general molecular manufacturing.

Artificial molecular machine synthesizes a small peptide

Posted by Jim Lewis on January 28th, 2013

A small molecular machine based on a rotaxane molecule autonomously added three amino acids in a programmed order to a seed tripeptide to form a hexapeptide

Controlled stepwise rotation on a single atom bearing

Posted by Jim Lewis on January 21st, 2013

Electrons from a scanning tunneling microscope tip turn a five-arm rotor connected via a single ruthenium atom bearing to a tripod anchoring the molecular motor to a gold surface.

Nanometer-scale optical positioning and focusing

Posted by Jim Lewis on January 16th, 2013

A theoretical proposal for optical tweezers and an experimental optical focusing device both depend upon electromagnetic waves trapped and guided along metal-insulator interfaces. Will these advances provide tools for manipulating molecular building blocks?

Testing and improving scaffolded DNA origami for molecular nanotechnology

Posted by Jim Lewis on December 19th, 2012

In two different sets of experiments a German research group has shown that scaffolded DNA origami can be used to assemble complex structures with precise sub-nanometer positional control, and that constant temperature reaction can greatly increase yields and decrease production times.

Two types of artificial muscle from nanotechnology

Posted by Jim Lewis on December 13th, 2012

One research group working with rotaxanes and another group working with carbon nanotubes have provided two very different solutions to the problem of producing motion via artificial muscles at different scales from the nano to the macro.

Optimal bond loads in designing molecular machines

Posted by Jim Lewis on December 11th, 2012

A study of a biological molecular machine has shown that the machine functions most effectively when it uses chemical bonds just barely strong enough to survive the power stroke of the machine.

Arbitrarily complex 3D DNA nanostructures built from DNA bricks

Posted by Jim Lewis on December 6th, 2012

A set of 32-nucleotide single strand DNA bricks was designed so that each can interact independently with four other DNA bricks so that sets of hundreds of bricks can self-assemble into arbitrarily complex 25-nm 3D shapes, each comprising 1000 8-base pair volume elements.

Nanotechnology milestone: general method for designing stable proteins

Posted by Jim Lewis on November 21st, 2012

Five proteins were designed from scratch and found to fold into stable proteins as designed, proving the ability to provide ideal, robust building blocks for artificial protein structures.

Writing a single-atom qubit in silicon

Posted by Jim Lewis on November 8th, 2012

A single-electron spin qubit on a phosphorous atom in a conventional silicon computer chip has been coherently manipulated, demonstrating the application of single atom nanotechnology to the development of a scalable platform for a quantum computer.

More complex circuits for synthetic biology lead toward engineered cells

Posted by Jim Lewis on November 6th, 2012

One possible pathway from current technology to advanced nanotechnology that will comprise atomically precise manufacturing implemented by atomically precise machinery is through adaptation and extension of the complex molecular machine systems evolved by biology. Synthetic biology, which engineers new biological systems and function not evolved in nature, is an intermediate stage along this path. An [...]

The potentially world-changing research that no one knows about

Posted by Stephanie C on October 29th, 2012

Too much reliance on opportunity-based research could significantly hinder scientific advancement. We have the ability now to explore the specifics of potential future technologies, and the knowledge gained could, in turn, add useful and possibly surprising priorities for research today.

Biological molecular motors programmed to run DNA chasis

Posted by Jim Lewis on October 17th, 2012

Two types of biological molecular motors that run in opposite directions along a protein track can be used in different arrangements to either move a complex DNA cargo along the track or engage in a tug-of-war.

Metal-organic frameworks provide large molecular cages for nanotechnology

Posted by Jim Lewis on October 10th, 2012

Large molecular cages constructed from metal-organic frameworks have set a record for the greatest surface area in the least mass.

Metal-organic frameworks (MOFs) are back in the news again. A few months ago we cited the use of MOFs by Canadian chemists to self-assemble a molecular wheel on an axis in a solid material. More recently chemists at Northwestern University have used MOFs to set a world record for surface area. From “A world record for highest-surface-area materials“:

Northwestern University researchers have broken a world record by creating two new synthetic materials with the greatest amount of surface areas reported to date.

Named NU-109 and NU-110, the materials belong to a class of crystalline nanostructure known as metal-organic frameworks (MOFs) that are promising vessels for natural-gas and hydrogen storage for vehicles, and for catalysts, chemical sensing, light harvesting, drug delivery, and other uses requiring a large surface area per unit weight.

The materials’ promise lies in their vast internal surface area. If the internal surface area of one NU-110 crystal the size of a grain of salt could be unfolded, the surface area would cover a desktop. …

MOFs are composed of organic linkers held together by metal atoms, resulting in a molecular cage-like structure. The researchers believe they may be able to more than double the surface area of the materials by using less bulky linker units in the materials’ design. …

Beyond their near-term practical applications, Eric Drexler has cited MOFs as potentially useful building blocks in the molecular machine path to molecular manufacturing. Near-term applications may drive the technology development to produce more choices for molecular machine system components.
—James Lewis, PhD

Review of molecular machines for nanotechnology

Posted by Jim Lewis on October 5th, 2012

A brief article reviews several types of molecular machines that chemists have built to mimic biology and provide movement for future types of nanotechnology.