Tribology Letters

, Volume 10, Issue 1–2, pp 89–96 | Cite as

Shear-induced mechanochromism in polydiacetylene monolayers

  • A.R. Burns
  • R.W. Carpick
  • D.Y. Sasaki
  • J.A. Shelnutt
  • R. Haddad
Article

Abstract

We use atomic force microscopy to actuate and characterize the nanoscale “mechanochromism” of polydiacetylene monolayers on atomically-flat silicon oxide substrates. We find explicit evidence that the irreversible blue-to-red transformation is caused by shear forces exerted normal to the polydiacetylene polymer backbone. The anisotropic probe-induced transformation is characterized by a significant change in the tilt orientation of the side chains with respect to the surface normal. We discuss preliminary molecular dynamics simulations and electronic structure calculations on twelve-unit polydiacetylene oligomers that allow us to correlate the transformation with bond-angle changes in the conjugated polymer backbone.

atomic force microscopy friction force microscopy friction anisotropy shear force microscopy nanotribology polydiacetylenes LB films molecular mechanics conjugated polymers 

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Copyright information

© Plenum Publishing Corporation 2001

Authors and Affiliations

  • A.R. Burns
  • R.W. Carpick
  • D.Y. Sasaki
  • J.A. Shelnutt
  • R. Haddad

There are no affiliations available

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