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Related Concept Videos

Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Electrical Synapses

Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
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Energy Stored In A Coaxial Cable

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Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
Electrical Conductivity01:13

Electrical Conductivity

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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
08:07

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Published on: June 18, 2013

Oligoyne single molecule wires.

Changsheng Wang1, Andrei S Batsanov, Martin R Bryce

  • 1Department of Chemistry, Durham University, Durham DH1 3LE, United Kingdom.

Journal of the American Chemical Society
|October 15, 2009
PubMed
Summary
This summary is machine-generated.

We measured the electrical conductance of oligoyne molecular wires. Their conductance is surprisingly independent of length, suggesting potential for molecular electronics.

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Area of Science:

  • Molecular Electronics
  • Condensed Matter Physics
  • Organic Chemistry

Background:

  • Molecular wires are crucial for nanoscale electronic devices.
  • Understanding charge transport through conjugated organic molecules is essential for designing efficient molecular electronic components.
  • Oligoynes offer a promising scaffold for molecular wires due to their rigid, linear structure.

Purpose of the Study:

  • To investigate the single-molecule electrical conductance of oligoyne molecular wires with varying lengths.
  • To explore the influence of molecular structure and electrode contact geometry on conductance.
  • To evaluate the potential of oligoynes as building blocks for molecular electronic circuits.

Main Methods:

  • Scanning Tunneling Microscopy (STM) molecular break junction technique.
  • Fabrication of gold-molecule-gold (Au|molecule|Au) junctions.
  • Experimental measurements complemented by Density Functional Theory (DFT) and non-equilibrium Green's function (NEGF) calculations.

Main Results:

  • Conductance histograms revealed multiple series of peaks, indicating various contact geometries.
  • Higher conductance was correlated with pyridyl group adsorption at highly coordinated gold sites.
  • Oligoynes exhibited a low decay constant (beta value of 0.06 ± 0.03 Å⁻¹), showing minimal conductance dependence on molecular length.

Conclusions:

  • Oligoyne molecular wires demonstrate length-independent conductance, a desirable trait for molecular electronics.
  • The observed behavior differs from traditional exponential decay seen in other molecular systems like 4,4'-bipyridyl.
  • Oligoynes and polyynes represent a highly promising class of materials for future electronic circuitry integration.