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Related Concept Videos

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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The motion of molecules in a gas is random in magnitude and direction for individual molecules, but a gas of many molecules has a predictable distribution of molecular speeds. This predictable distribution of molecular speeds is known as the Maxwell-Boltzmann distribution. The distribution of molecular speeds in liquids is comparable to that of gases but not identical and can help to understand the phenomenon of the boiling and vapor pressure of a liquid. Consider that a molecule requires a...
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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Molecular Orbital Theory II

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Molecular Orbital Energy Diagrams
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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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Related Experiment Video

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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
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Molecular mobility on graphene nanoroads.

Mehdi Jafary-Zadeh1, Yong-Wei Zhang1

  • 1Institute of High Performance Computing, A*STAR, Singapore 138632.

Scientific Reports
|August 6, 2015
PubMed
Summary

Graphene nanoroads confine C60 molecule motion, with width and edge type controlling 1D hopping and edge-shuffling. Zigzag edges enable faster transport than armchair edges, informing molecular conveyor circuit design.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Graphene nanoroads (GNRDs) offer potential for nanoscale transport.
  • Controlling molecular motion on nanostructures is crucial for device applications.

Purpose of the Study:

  • To investigate molecular mobility on graphene nanoroads.
  • To understand the influence of GNRD width and edge type on admolecule confinement and motion.

Main Methods:

  • Molecular dynamics simulations were employed.
  • A C60 admolecule was used as a prototype.
  • Potential energy surfaces were analyzed.

Main Results:

  • GNRDs confine admolecule motion up to a specific temperature.

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  • Admolecule motion transitions from 1D hopping to edge-shuffling based on GNRD width.
  • Zigzag-edged GNRDs exhibit faster admolecule transport than armchair-edged GNRDs.

    • Conclusions:

    • GNRD geometry significantly impacts molecular transport.
    • Results provide a foundation for designing molecular conveyor circuits.
    • Experimental realization of hydrogenated graphene nanostructures supports these findings.