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Rolling Resistance: Problem Solving01:17

Rolling Resistance: Problem Solving

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Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
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When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
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Deliberate boxes and accidental wheels.

Gurpreet Kaur1, Matthew I J Polson, Richard M Hartshorn

  • 1Department of Chemistry, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand. richard.hartshorn@canterbury.ac.nz.

Dalton Transactions (Cambridge, England : 2003)
|January 28, 2015
PubMed
Summary

Researchers created novel box structures and decanickel wheel complexes using a specific ligand and metal ions. These findings highlight new possibilities in coordination chemistry and supramolecular assembly.

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Terpyridine-based ligands are versatile building blocks in coordination chemistry.
  • Divalent metal ions offer diverse coordination geometries and electronic properties.
  • Self-assembly of complex architectures is a key goal in supramolecular chemistry.

Purpose of the Study:

  • To design and synthesize novel supramolecular structures using a dinucleating terpyridine-aminomethylpyridine ligand (L).
  • To investigate the influence of divalent metal ions on the self-assembly process.
  • To explore the formation of unique architectures, including box structures and wheel complexes.

Main Methods:

  • Synthesis of the dinucleating terpyridine-aminomethylpyridine ligand (L).
  • Coordination of ligand L with various divalent metal ions (e.g., Ni(II)).
  • Structural characterization of the resulting complexes using X-ray crystallography and other spectroscopic techniques.

Main Results:

  • Formation of a series of closely related box structures through deliberate self-assembly.
  • Discovery of unprecedented decanickel wheel complexes.
  • Identification of potential stabilizing interactions, such as halogen-aromatic hydrogen bonds, in the wheel structures.

Conclusions:

  • The dinucleating ligand L effectively directs the self-assembly of metal ions into specific architectures.
  • The combination of ligand design and metal ion choice allows for predictable synthesis of complex supramolecular systems.
  • The formation of decanickel wheels represents a significant advancement in the field of coordination cages and macrocycles.