«Strings of electron - carrying proteins may hold the secret to «electric bacteria»:
The nanowire structure and electron transfer process of a unique bacterium could provide a foundation for sustainable energy.»
Not exact matches
Whereas the fine
nanowires initially crystallise in a hexagonal, so - called wurtzite
structure, this behaviour changes after some time and the wires adopt a cubic zinc blende
structure as they continue to grow.
This change is important when it comes to applications, since the
structure and shape of the
nanowires have important consequences for the properties of the resulting material.
The researchers installed the chamber in the research light source PETRA III of the German Electron Synchrotron (DESY) and took X-ray pictures every minute to determine the
structure and diameter of the growing
nanowires.
At one - minute intervals the scientists took X-ray pictures, which allowed both the internal
structure and the diameter of the growing
nanowires to be simultaneously determined.
«Although this process is already quite well established, it has not been possible until now to specifically control the crystal
structure of the
nanowires produced by it.
Their observations reveal exact details of the growth process responsible for the evolving shape and crystal
structure of the crystalline
nanowires.
This change is of relevance to applications, as the
structure and shape of the
nanowires considerably affect the properties of the resulting material.
The
nanowires are produced by a company in Sweden and this new information can be used to tweak the layer
structure in the
nanowires.
In a study, reported in the January 21, 2016 issue of Nano Letters, the team demonstrated a new redox - responsive assembly method to synthesize hierarchically
structured carbon - sheathed germanium
nanowires (c - GeNWs) on a large scale by the use of self - catalytic growth process assisted by thermally decomposed natural gas.
Small magnetic domain wall
structures in
nanowires can be used to store information and, for example, can be used as angle sensors.
These whirls can be moved rapidly and reliably along
nanowires or other
structures in future memories.
Further microscopy of the
nanowire showed that the
structure of the tin oxide atoms had changed from an ordered crystalline arrangement to an amorphous glass - like form.
The defected
nanowires with diameters smaller than 1.8 nm and a single stacking fault, surprisingly, have higher a yield stress compared to their counterparts with perfect
structures.
Once we were able to induce
nanowire growth, we started analyzing their composition and
structure, which took another year of work.
For instance, certain substrates on which the
nanowires grow create conditions so that the
nanowire growth orientation is dictated by the substrate's underlying crystal
structure.
Further comparison is done with
nanowires of dimension similar to the phononic crystal
structure to establish a relation between their thermal conductances.
In this work, a harmonic lattice dynamics and scattering boundary method based atomistic modeling tool was created to calculate phonon spectra and modal phonon transmission coefficients in nano - phononic
structures and diameter - modulated
nanowires.
Structure of the Type IVa Major Pilin from the Electrically Conductive Bacterial
Nanowires of Geobacter sulfurreducens, J. Biol.
With the help of related
structures on disease - causing bacteria, the researchers show that the protein's shape and form suggest possible ways for the bacteria to shuttle electrons along the
nanowire.
A transmission electron microscope image taken at Argonne shows the honeycomb
structure of the silicon
nanowires.