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Related Concept Videos

Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

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Grafting Multiwalled Carbon Nanotubes with Polystyrene to Enable Self-Assembly and Anisotropic Patchiness
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Molecular wires self-assembled on a graphite surface.

Andreas Riemann1, Brittany Nelson

  • 1Department of Physics & Astronomy, Advanced Materials Science & Engineering Center, Western Washington University, Bellingham, Washington 98225, USA. riemana@physics.wwu.edu

Langmuir : the ACS Journal of Surfaces and Colloids
|March 6, 2009
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Summary

l-methionine self-assembles into regular molecular wires on graphite surfaces. Deposition amount controls spacing, while molecular arrangement dictates wire width, revealing long-range interactions.

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Area of Science:

  • Surface science
  • Nanotechnology
  • Biophysics

Background:

  • Amino acids are fundamental biological molecules with potential for nanoscale applications.
  • Self-assembly is a key process in forming ordered structures from molecular building blocks.
  • Highly ordered pyrolytic graphite (HOPG) serves as a versatile template for surface studies.

Purpose of the Study:

  • To investigate the self-assembly behavior of l-methionine on HOPG.
  • To characterize the structures formed by l-methionine.
  • To understand the factors controlling the self-assembled structures.

Main Methods:

  • Scanning tunneling microscopy (STM) was employed to image the structures at the nanoscale.
  • Molecular mechanics calculations were performed to model the adsorption geometry and interactions.
  • L-methionine was deposited onto HOPG under ambient conditions.

Main Results:

  • L-methionine self-assembles into highly regular molecular wires on the graphite surface.
  • The spacing between molecular wires is controllable by adjusting the deposition amount.
  • Wire width is determined by the specific arrangement of two l-methionine molecules.
  • Evidence for long-range interactions between the molecular wires was observed.

Conclusions:

  • L-methionine can form well-ordered nanostructures through self-assembly on graphite.
  • The study presents a model for the adsorption geometry of l-methionine on graphite.
  • Findings contribute to understanding molecular self-assembly and designing nanoscale architectures.