May the force be with you

Article Abstract:

Merkel and colleagues have shown that protein-ligand interaction strengths and dynamics can be tuned to be weak or strong by altering how fast the retracting force is driven. Their theoretical work is backed by experiment isolating single streptavidin-biotin interactions and measuring the interaction survival times and strengths over loading rates. Prominent barriers over the force-driven activation landscape were mapped and atomic force microscopy measurements represented a single point in continuous dynamic spectrum of the activation-barrier landscape.

Research, Biophysics

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Growth of nanotubes for probe microscopy tips

Article Abstract:

Carbon nanotubes have potential uses as tips in scanning probe microscopies, but the current method to attach nanotube bundles for tip fabrication is time consuming and restricts the quality of tips. A technique has been developed to grow individual carbon nanotube probe tips directly, using chemical vapour deposition (CVD), having control of the orientation. A conventional silicon (Si) tip is flattened at its apex using contact atomic force microscopy, and the CVD nanotube tips are formed reproducibly, shortened by an AFM technique.

Chemical vapor deposition

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Chemical identification of individual surface atoms by atomic force microscopy

Article Abstract:

The short-range chemical forces that arise with the onset of chemical bonding between the tip and surface atoms are measured and a normalization procedure is used to overcome their dependence on the force microscope tip. The approach used for characterizing the local composition of a multi-element system at the atomic level, which is based on the detection of the short-range chemical forces between the outermost atom of an atomic force microscopy (AFM) tip and individual surface atoms, is widely applicable.

Japan, Czech Republic, Identification and classification, Atoms

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