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Molecular-scale shear response of the organic semiconductor β -DBDCS (100) surface
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation. Universitario de Cantoblanco, Spain.
Universitario de Cantoblanco, Spain.
Universidad Complutense de Madrid, Spain ; Instituto de Geociencias IGEO (UCM-CSIC), Spain.
Universitario de Cantoblanco, Spain.
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2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 11, article id 115422Article in journal (Refereed) Published
Abstract [en]

In this work we present friction-force microscopy (FFM) lattice-resolved images acquired on the (100) facet of the semiconductor organic oligomer (2Z,2′Z)-3,3′-(1,4-phenylene)bis(2-(4-butoxyphenyl)acrylonitrile) (β-DBDCS) crystal in water at room temperature. Stick-slip contrast, lateral contact stiffness, and friction forces are found to depend strongly on the sliding direction due to the anisotropic packing of the molecular chains forming the crystal surface along the [010] and [001] directions. The anisotropy also causes the maximum value of the normal force applicable before wearing to increase by a factor of 3 when the scan is performed along the [001] direction on the (100) face. Altogether, our results contribute to achieving a better understanding of the molecular origin of friction anisotropy on soft crystalline surfaces, which has been often hypothesized but rarely investigated in the literature.

Place, publisher, year, edition, pages
2017. Vol. 96, no 11, article id 115422
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Natural Sciences
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URN: urn:nbn:se:ri:diva-33145DOI: 10.1103/PhysRevB.96.115422Scopus ID: 2-s2.0-85030108885OAI: oai:DiVA.org:ri-33145DiVA, id: diva2:1179051
Available from: 2018-01-31 Created: 2018-01-31 Last updated: 2018-01-31Bibliographically approved

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