Large friction anisotropy of a polydiacetylene monolayer |
| |
Authors: | Carpick RW Sasaki DY Burns AR |
| |
Affiliation: | (1) Sandia National Laboratories, Surface and Interface Sciences, Albuquerque, NM 87185‐1413, USA;(2) Sandia National Laboratories, Organic Materials Aging and Reliability, Albuquerque, NM 87185‐1407, USA |
| |
Abstract: | Friction force microscopy measurements of a polydiacetylene monolayer film reveal a 300% friction anisotropy that is correlated
with the film structure. The film consists of a monolayer of the red form of N‐(2‐ethanol)‐10,12‐pentacosadiynamide, prepared
on a Langmuir trough and deposited on a mica substrate. As confirmed by atomic force microscopy and fluorescence microscopy,
the monolayer consists of domains of linearly oriented conjugated backbones with pendant hydrocarbon side chains above and
below the backbones. Maximum friction occurs when the sliding direction is perpendicular to the backbones. We propose that
this effect is due to anisotropic film stiffness, which is a result of anisotropic side chain packing and/or anisotropic stiffness
of the backbone itself. Friction anisotropy is therefore a sensitive, optically‐independent indicator of polymer backbone
direction and monolayer structural properties.
This revised version was published online in September 2006 with corrections to the Cover Date. |
| |
Keywords: | atomic force microscopy friction force microscopy friction anisotropy friction asymmetry nanotribology polydiacetylene LB films directional dependence fluorescence |
本文献已被 SpringerLink 等数据库收录! |
|