Molecular dynamics calculations define optimum strand lengths for the assembly of DNA films as greater than 10 and less than 30 nucleotides.
Archive for the 'Computational nanotechnology' Category
An IEEE Spectrum podcast asks the question, Why Are Terrorists Often Engineers? The blurb: With terrorism back in the news, so, too, is a curious footnote: Of the hundreds of individuals involved in political violence, nearly half of those with degrees have been engineers. This finding, first published in 2008, has been substantiated by two [...]
We have reports from a couple of Foresight members who have toured the Allosphere, part of the California NanoSystems Institute at UC Santa Barbara, and it sounds truly impressive. From their website: The AlloSphere, a 30-foot diameter sphere built inside a 3-story near-to-anechoic (echo free) cube, allows for synthesis, manipulation, exploration and analysis of large-scale [...]
The nomination/submission process for the 2010 Foresight Institute Feynman Prizes in Nanotechnology is now open. Two $5000 prizes are offered, one for theory and one for experimental achievement. These prizes recognize progress toward the goal of atomic-level control in the construction of macroscale 3D objects: an ambitious goal but one toward which physicist Richard Feynman [...]
Foresight Feynman Prize winner Robert Freitas brings to our attention the first published theoretical study of DMS (diamond mechanosynthesis) tool-workpiece operating envelopes and optimal tooltip trajectories for a complete positionally controlled reaction sequence, which he did with colleagues in Russia. He writes, “This paper represents the first extensive DMS tooltip trajectory analysis, examining a wide [...]
From Ars Technica: Nobel Intent, a thought-provoking article on what the prevalence of computational science portends for reproducibility in science: Victoria Stodden is currently at Yale Law School, and she gave a short talk at the recent Science Online meeting in which she discussed the legal aspects of ensuring that the code behind computational tools [...]
Nanotechnology Enables Real Atomic Precision is the title of a piece by Susan Smith in Desktop Engineering, which includes comments by longtime Foresight Senior Associates Steve Vetter and Tihamer Toth-Fejel: While nanotechology might mean different things to different people, the term was originally coined to describe the building of things from the bottom up with [...]
If you were an alien from an advanced civilization who had been stranded on Earth, but had all your people’s knowledge on a thumb drive, how would you go about creating nanotech and building up Earth’s technology to the level you could rejoin your galactic civilization? If you actually knew the details, probably one of [...]
Last week I posted a story of strange behavior in the simulation of molecular machines. One commenter asked if this was due to something unusual in the starting configuration of the atoms. This was the first thing we investigated, and didn’t seem to be the case. There was a small amount to strain energy in [...]
One of the constraints laid down by DARPA at the recent Physical Intelligence proposers workshop was that the model of intelligence that was to be proposed had to have a physical implementation. It seemed odd to some of the attendees that this should be a hard constraint, since many models of intelligence have a perfectly [...]
Some interesting developments in memories: This Nanowerk story reports results out of Alex Zettl’s group at Berkeley on a memory cell that consists of an iron nanoparticle which can be moved back and forth in a nanotube. More information on this can be found at Zettl’s site here. This memory, like someother nanotech schemes, relies [...]
Evolution has adapted what were the bones of the fingers of the bat’s ancestors to form the skeleton of its wing. Similarly, in technology, when one element of a system is capable of expanding to take up new functions, it can substitute for what might have been expected to be different ways to achieve the [...]
Two papers in a recent issue of Science suggest that graphene is rapidly moving from being “just” a nanotech wonder material to becoming relevant to atomically precise nanotechnologies.
This the sixth essay in a series exploring if, when, and how the Singularity will happen, why (or why not) we should care, and what, if anything, we should do about it. Part VI: The heavily-loaded takeoff The fastest software I ever used ran on some of the slowest computers I ever had. Circa 1980, [...]
New computational results reveal how the proper hierarchical assembly of smaller protein domains optimizes mechanical properties.
Computer simulations have shown that graphene deposited on a silicon dioxide surface will be either a semiconductor or a metal depending on whether the underlying layer is terminated with oxygen atoms or passivated with hydrogen atoms.
Computational nanotech studies have shown that deliberate introduction of structural defects at specific sites in carbon nanotubes can guide electrons along specific paths, providing a way to fabricate complex electronic circuits from nanotubes.
Molecular dynamics simulations show that electron tunneling through nanoscale rotary motors based on carbon nanotube shafts may enable nanotech motors to rotate more than a million times faster than their biological counterparts.
Dr. David Baker, who with Dr. Brian Kuhlman was awarded the 2004 Foresight Nanotech Institute Feynman Prize for Theory, will be one of three winners of the 2008 Raymond and Beverly Sackler International Prize in Biophysics. Dr. Baker has been featured on Nanodot posts this year for inviting online gamers to aid in protein design [...]
Robert A. Freitas Jr. brings to our attention a major step on the road to advanced nanotech, published a couple weeks ago in Science (abstract). He writes: This paper reports purely mechanical-based covalent bond-making and bond-breaking (true mechanosynthesis) involving atom by atom substitution of silicon (Si) atoms for tin (Sn) atoms in an Sn monolayer [...]