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Archive for the 'Nanotech' Category

Computational nanotechnology reveals complex interactions in double-walled carbon nanotubes

Posted by Jim Lewis on June 8th, 2015

Density functional theory calculations of the electronic properties of double-walled carbon nanotubes (DWCNTs) comprising two concentric zigzag tubes of different chiralities reveal complex effects upon the electronic band gap, identifying candidate combinations for diverse applications from transistors to macroscopic conducting wires.

Computational nanotechnology to benefit from expanded first-principles molecular dynamics

Posted by Jim Lewis on June 7th, 2015

A combination of techniques has made possible the expansion of problems that can be handled by first-principles molecular dynamics from a few hundred atoms to a very large system containing 32,768 atoms.

Arrays of pure semiconducting carbon nanotubes for nanoelectronics

Posted by Jim Lewis on June 6th, 2015

A very efficient and scalable method of completely removing metallic carbon nanotubes from mixtures of metallic and semiconducting carbon nanotubes produces arrays suitable for many applications and for studies of thin film transistors.

Dynamic nanomachines for DNA nanotechnology inspired by proteins

Posted by Jim Lewis on June 4th, 2015

Programmed assembly and disassembly of rigid 3D DNA origami objects has been achieved by designing complementary surface shapes based upon weak stacking interactions to create simple nanomachines.

Preserving protein function in DNA-protein nanostructures

Posted by Jim Lewis on June 1st, 2015

Linking proteins to DNA scaffolds to produce complex functional nanostructures can require chemistry that damages protein function. A new systematic approach avoids exposing proteins to damaging conditions.

Single molecule pump concentrates small molecules

Posted by Jim Lewis on May 26th, 2015

A rotaxane-based single molecule pump combines cycling oxidation-reduction potential of the solution with kinetic barriers to moving backward to concentrate small ring molecules against an energy gradient.

Conference video: Microscopic Reversibility: The Organizing Principle for Molecular Machines

Posted by Jim Lewis on May 13th, 2015

At the 2013 Conference Dean Astumian contrasted macroscopic machines at static equilibrium and molecular machines at dynamic equilibrium, and presented information ratchets and microscopic reversibility as the organizing principle of molecular machines.

Conference video: Multi-Million Atom Simulations for Single Atom Transistor Structures

Posted by Jim Lewis on May 12th, 2015

At the 2013 Conference Gerhard Klimeck presented the work of his computational nanotechnology network modeling nanoelectronic devices, using simulations of multi-million atom domains to understand the function of single atom devices embedded in larger nanostructures.

Nanoparticles shepherd DNA into cells to regulate immune response

Posted by Jim Lewis on May 6th, 2015

DNA sequences designed to either stimulate a specific immune response or to down-regulate an undesirable response deliver superior performance when organized on nanoparticles to reach their intended cellular targets.

Nanowires and bacteria harnessed for artificial photosynthesis

Posted by Jim Lewis on May 4th, 2015

A prototype system to produce chemicals and fuels from sequestered carbon dioxide, water, and sunlight uses semiconductor nanowires to produce electron-hole pairs, which are then used by two types of bacteria to produce oxygen and a variety of useful chemical products.

Science and technology roadmaps for nanotechnology

Posted by Jim Lewis on May 3rd, 2015

A European Science and Technology Roadmap for Graphene, Related Two-Dimensional Crystals, and Hybrid Systems hints at the opportunities to be harvested from, and the need for, the development of atomically precise manufacturing (APM).

Nanothreads formed from smallest possible diamonds

Posted by Jim Lewis on May 2nd, 2015

A new form of carbon produced by very slowly releasing benzene compressed at 200,000 times atmospheric pressure may be the strongest material possible.

UK SuperSTEM facility advances imaging and analysis of materials

Posted by Jim Lewis on April 30th, 2015

Advanced aberration-corrected scanning transmission electron microscopes in UK facility provide atomically precise characterization of a variety of materials to guide R&D in alloys, drug delivery, lasers and other areas.

Gold nanotubes engineered for diagnosis and therapy

Posted by Jim Lewis on April 30th, 2015

Gold nanotubes engineered to a specified length, modified surfaces, and to have other desirable characteristics showed expected abilities to enter tumor cells in laboratory studies, and to distribute to tissues within live mice as intended.

Foresight Institute Awards Feynman Prizes in Nanotechnology to Amanda S. Barnard, Joseph W. Lyding

Posted by Jim Lewis on April 23rd, 2015

The Theory Prize was given for research into diamond nanoparticles; the Experimental Prize was given for development of scanning tunneling microscope (STM) technology.

Solid-phase synthesis of custom-made DNA nanotubes

Posted by Jim Lewis on April 9th, 2015

Single-molecule spectroscopy makes possible adding one rung at a time to a foundational rung grafted to a surface to make a long nanotube scaffold of predetermined sequence.

Flexible supercapacitor from stacked nanomaterial

Posted by Jim Lewis on April 8th, 2015

A nanoporous form of graphene made by burning off other elements from an inexpensive polymer has been used to fabricate flexible supercapacitors via a process that can be scaled to industrial quantities to provide energy storage for wearable, flexible electronics.

DNA nanoswitches open window on molecular interactions

Posted by Jim Lewis on April 5th, 2015

Positioning two or more molecules along a long DNA strand can cause the DNA molecule to adopt different shapes if the molecules interact. Quickly and cheaply separating these shapes by a simple gel electrophoresis assay provides a wealth of information about how the molecules interact.

New scaffold for nanotechnology engineered from amyloid-like proteins

Posted by Jim Lewis on April 4th, 2015

Design and computational simulation of amyloid proteins of diverse functions from diverse sources enable the self-assembly of proteins that could provide scaffolds for diverse applications.

Cotranscriptional folding of single RNA strand added to nanotechnology toolkit

Posted by Jim Lewis on March 31st, 2015

RNA origami brings new dimensions to nucleic acid nanotechnology by exploiting the much greater variety of RNA structural motifs (compared to DNA) to do what cannot easily be done with DNA origami, like fold into predetermined nanostructures rapidly while being transcribed.