About
16
Publications
2,433
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110
Citations
Citations since 2017
Introduction
Materials Science
- Friction at Nanoscale
- Atomic Force Microscopy
Additional affiliations
November 2021 - present
November 2019 - October 2021
Justus Liebig University Giessen
Position
- PostDoc Position
Description
- Searching for atomic mechanisms of 'Contact Aging'
May 2018 - July 2018
Position
- Researcher
Description
- Investigating the effect of environment on microstructure evolution and friction of metallic multilayers
Education
January 2016 - September 2019
Field of study
- Materials Science, Surface Science, Tribology, Microtribometer, Atomic Force Microscopy, Applied Materials
September 2013 - August 2015
Field of study
- Materials Science, Surface Science, Atomic Force Microscopy, Nanotribology, Manipulation of Nanoparticles
January 2012 - June 2012
Publications
Publications (16)
Structural superlubricity describes the state of greatly reduced friction between incommensurate atomically flat surfaces. Theory predicts that, in the superlubric state, the remaining friction sensitively depends on the exact structural configuration. In particular the friction of amorphous and crystalline structures for, otherwise, identical inte...
In this work, we investigated the sliding friction measured between poly(methyl methacrylate) (PMMA) colloidal probes with two different diameters D (1.5 and 15 μm) and laser-induced periodic surface structures (LIPSS) on stainless steel with periodicities Λ of 0.42 and 0.9 μm, when the probes are elastically driven along two directions, perpendicu...
Contact aging, i.e., the strengthening of a tribological contact with time, is a phenomenon that is commonly attributed to an increase of the effective contact area between multiasperity surfaces based on contact mechanical processes. Only recently, atomic force microscopy experiments and simulations on single silica nanojunctions have also demonst...
We present results from a systematic investigation of environmental effects on the frictional behavior of Au–Ni multilayer films of varying interlayer spacing. The current results, sliding against ruby spheres in a dry N2 atmosphere, are compared to prior work on the tribological behavior of these materials under ultra-high vacuum (UHV) (Cihan et a...
Recent studies of deformation mechanisms of metals and alloys pioneer the better investigation of the friction and wear behavior of materials with well-defined initial microstructures. Within this scope, in this work, the effect of sub-surface deformations on the resulting friction and wear behavior has been searched by means of a systematic experi...
During sliding of metallic surfaces, the near surfaces undergo significant changes in terms of topography, composition and microstructure. Since friction and wear behavior of the materials are strongly influenced by sub-surface deformations, it is fundamental to investigate these effects. Therefore, the present study aims towards a better understan...
Despite its fundamental importance, physical mechanisms that govern friction are poorly understood. While a state of ultra-low friction, termed structural lubricity, is expected for any clean, atomically flat interface consisting of two different materials with incommensurate structures, some associated predictions could only be quantitatively conf...
Supplementary Figures 1-4, Supplementary Notes 1-4 and Supplementary References
The results reveal remarkably low interfacial friction forces for Au-HOPG material system under ambient conditions, in line with the theory of ”structural lubricity”.
Forming a complete understanding of the physical mechanisms that govern friction on the nanometer and atomic scales is an ongoing endeavor for scientists from various disciplines. While atomic force microscopy (AFM) has proven to be invaluable for the detailed study of nano-scale frictional properties associated with various surfaces, issues relate...
We present experiments involving the structural and frictional characterization of gold nanoparticles (AuNP) thermally deposited on highly oriented pyrolytic graphite (HOPG). The effect of thermal depo-sition amount, as well as post-deposition annealing on the morphology and distribution of gold on HOPG is studied via scanning electron microscopy (...
Projects
Projects (4)
To investigate the dynamics of solid contacts formed by colloidal AFM probes and laser-induced periodic surface structures (LIPSS)
Contact aging can be defined as the increase in interfacial friction with time. In this project, we aim to explore the atomic mechanisms of contact aging, by examining friction behavior as a function of temperature.
In this project, we investigate friction (a ubiquitous phenomenon of immense physical importance) on the nanometer scale via atomic force microscopy. Topics of interest range from the nanotribology of 2D materials to structural superlubricity at well-defined interfaces. In certain studies, molecular dynamics (MD) and density functional theory (DFT) simulations are employed to corroborate experimental results.
