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Attractive and repulsive terms in multi-filament dispersion interactions.

Subhojit Pal1, John F Dobson2, Mathias Boström3,4

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Filamentary nanomaterials like nanowires and nanotubes interact via long-ranged van der Waals forces, causing clustering. Their N-object interactions alternate in sign, requiring advanced calculations for accurate predictions.

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Area of Science:

  • Physics
  • Nanoscience
  • Chemistry
  • Biology
  • Medicine

Background:

  • Filamentary nanomaterials (nanowires, nanotubes, DNA) are of significant interest across multiple scientific disciplines.
  • These objects interact through strong, long-ranged van der Waals (vdW) forces, leading to the formation of multi-object bundles.

Purpose of the Study:

  • To analyze the many-object van der Waals interactions between filamentary objects.
  • To predict the N-object vdW energy contributions and understand the underlying mechanisms of electronic screening and anti-screening.

Main Methods:

  • Perturbative analysis of van der Waals interactions.
  • Detailed analysis of a 4-cylinder van der Waals model to confirm theoretical predictions.

Main Results:

  • Predicted N-object vdW energy contributions that alternate in sign with increasing N.
  • Provided novel insights into electronic screening and anti-screening as mechanisms governing these interactions.
  • Confirmed findings through the analysis of a 4-cylinder vdW model.

Conclusions:

  • The alternating sign of N-object vdW interactions suggests complex behavior in bundled nanomaterials.
  • Electronic screening and anti-screening play a crucial role in understanding these interactions.
  • Non-perturbative calculations are likely necessary for accurate predictions of dispersion interactions in these systems.