Archive for February 15th, 2007|Daily archive page

Robotics, Artificial Intelligence, Sentient Rights, Speciesism, and Uploading the Mind

In nano on February 15, 2007 at 2:43 am

my new column is out


Properties Depend On Cluster Size

In nano on February 15, 2007 at 2:34 am

Numbers of edge atoms dictate physical and chemical properties of nanoparticles
Mitch Jacoby

What a difference a few atoms can make.

Tiny variations in the numbers of atoms along the edges of molybdenum disulfide nanoparticles can profoundly influence the crystal’s atomic-scale structure and coordination, electronic properties, and other characteristics, researchers in Denmark have shown. The findings may lead to improvements in MoS2-based desulfurization catalysts for fuel cleanup and to advanced lubricants and other applications.
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Nanoparticles Act Like Atoms

In nano on February 15, 2007 at 2:32 am

Gold spheres, bestowed with valency, are strung together in polymer-like chain
Bethany Halford
Image Title © Science 2007
Coated gold nanoparticles strung together via linker molecules.

Using a little topology and a few thiol ligands, materials scientists have managed to corral a gold nanoparticle’s thousands of atoms and make them behave like one divalent atom (Science 2007, 315, 358).

Transformed from a multivalent mass to tidy two-handled building blocks, the nanoparticles can then be hooked together into a tiny string of golden beads. “It’s the nanoscale equivalent of a polymer,” says Francesco Stellacci, the Massachusetts Institute of Technology professor who spearheaded the research.
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Nanoneedles Pierce Cells

In nano on February 15, 2007 at 2:31 am

Functionalized carbon nanotubes are taken up by cells via a possible universal mechanism
Michael Freemantle

The uptake of functionalized carbon nanotubes by living cells does not depend on cell type or on the nature of the chemical moieties grafted onto the tubes, according to a new study (Nat. Nanotechnol., DOI: 10.1038/nnano.2006.209). The research also provides evidence that nanotubes act like nanoneedles when they penetrate cell membranes.
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