2026-06-29T02:46:16Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/187202026-01-26T13:09:13Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Álvarez-Asensio, Rubén author Moreno Ramírez, Jorge S. author Pimentel Guerra, Carlos author Casado, Santiago author Matta, Micaela author Gierschner, Johannes author Muccioli, Luca author Yoon, Seong-Jun author Varghese, Shinto author Park, Soo Young author Gnecco, Enrico author Pina Martínez, Carlos Manuel author 2017 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. 1550-235X 10.1103/PhysRevB.96.115422 https://hdl.handle.net/20.500.14352/18720 https://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.115422 Molecular-scale shear response of the organic semiconductor β-DBDCS (100) surface