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Large friction anisotropy of a polydiacetylene monolayer

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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.

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Authors and Affiliations

  1. Sandia National Laboratories, Surface and Interface Sciences, Albuquerque, NM, 87185‐1413, USA

    R.W. Carpick & A.R. Burns

  2. Sandia National Laboratories, Organic Materials Aging and Reliability, Albuquerque, NM, 87185‐1407, USA

    D.Y. Sasaki

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  1. R.W. Carpick
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  2. D.Y. Sasaki
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  3. A.R. Burns
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Carpick, R., Sasaki, D. & Burns, A. Large friction anisotropy of a polydiacetylene monolayer. Tribology Letters 7, 79–85 (1999). https://doi.org/10.1023/A:1019113218650

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