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Tribological Properties Mapping: Local Variation in Friction Coefficient and Adhesion
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-4431-0671
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
2013 (English)In: Tribology letters, ISSN 1023-8883, E-ISSN 1573-2711, Vol. 50, no 3, 387-395 p.Article in journal (Refereed) Published
Abstract [en]

Tribological properties mapping is a new technique that extracts friction coefficient and adhesion maps obtained from lateral atomic force microscope (LAFM) images. By imaging the surface systematically as a function of load, a series of images can be tiled, and pixelwise fitted to a modified Amontons' Law to obtain friction coefficient and adhesion maps. This removes the ambiguity of friction contrast in LAFM imaging which can be a function of the load used for imaging. In ambient laboratory, air and tetradecane, a sample of Vancron(A (R))40, commercial powder metallurgical tool alloy containing nitrogen, have been scanned using a standard silicon cantilever in order to obtain tribological data. The tribological properties mapping provides unique information regarding the heterogeneous alloy microstructure as well as shedding light on the tribological behavior of the alloy.

Place, publisher, year, edition, pages
2013. Vol. 50, no 3, 387-395 p.
Keyword [en]
Friction, AFM, Atomic force microscope, LFM, Lateral atomic force microscope, Nanotribology, Friction coefficient mapping, Adhesion, Tool alloy, Microstructure
National Category
URN: urn:nbn:se:kth:diva-124457DOI: 10.1007/s11249-013-0136-8ISI: 000319161700009ScopusID: 2-s2.0-84878246729OAI: diva2:636277
Swedish Foundation for Strategic Research Swedish Research Council

QC 20130709

Available from: 2013-07-09 Created: 2013-07-05 Last updated: 2014-06-03Bibliographically approved
In thesis
1. Nanotribology, Surface Interactions and Characterization: An AFM Study
Open this publication in new window or tab >>Nanotribology, Surface Interactions and Characterization: An AFM Study
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

When two surfaces achieve contact, then contact phenomena such as adhesion, friction and wear can occur, which are of great interest in many disciplines, including physics, physical chemistry, material chemistry, and life and health sciences. These phenomena are largely determined by the nature and magnitude of the surface forces such as van der Waals, capillary and hydration forces. Moreover these forces are length-dependent, and therefore when the system scales down, their contribution scales up, dominating the interaction between the surfaces.

A goal of my PhD work was to investigate fundamental contact phenomena in terms of the surface forces that regulate their properties. The primary tool applied in this PhD thesis work has been the atomic force microscopy (AFM), which (with all of its sub-techniques) offers the possibility to study such forces with high resolution virtually between all types of materials and intervening media. Therefore, in this work it was possible to study the long ranged interactions presented in air between different industrially relevant materials and how these interactions are shielded when the systems are immersed in an ionic liquid.

Also investigated was the influence of microstructure on the tribological properties of metal alloys, where their good tribological properties were related with the vanadium and nitrogen contents for a FeCrVN tool alloy and with the chromium content for a biomedical CoCrMo alloy. Moreover, the effect of the intervening media can significantly affect the surface properties, and when the biomedical CoCrMo alloy was immersed in phosphate buffer saline solution (PBS), repulsive hydration forces decreased the friction coefficient and contact adhesion. On the other hand, with the immersion of the FeCrVN tool alloy in the NaCl solution, small particles displaying low adhesion were generated in specific regions on the surface with low chromium content. These particles are assumed to be related to a prepitting corrosion event in the tool alloy.

The mechanical properties of stratum corneum (SC), which is the outermost layer of the skin, were also studied in this work. The SC presents a highly elastic, but stiff surface where the mechanical properties depend on the nanoscale. A novel probe has been designed with a single hair fibre in order to  understand how the skin deforms locally in response to the interaction with such a fibre probe. This study revealed that is mostly the lateral scale of the deformation which determines the mechanical properties of the SC.

Finally, important achievements in this work are the developments of two new techniques - tribological property mapping and the Hybrid method for torsional spring constant evaluation. Tribological property mapping is an AFM technique that provides friction coefficient and contact adhesion maps with information attributed to the surface microstructure. The Hybrid method is an approach that was originally required to obtain the torsional spring constants for rigid beam shaped cantilevers, which could not be previously determined from their power torsional thermal spectra (conventional method). However, the applicability is shown to be general and this simple method can be used to obtain torsional spring constants for any type of beam shape cantilever.


Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. xviii, 78 p.
TRITA-CHE-Report, ISSN 1654-1081 ; 2014:13
National Category
Nano Technology
Research subject
urn:nbn:se:kth:diva-145727 (URN)978-91-7595-102-7 (ISBN)
Public defence
2014-06-13, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)

QC 20140603

Available from: 2014-06-03 Created: 2014-05-28 Last updated: 2014-06-30Bibliographically approved

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Alvarez-Asencio, RubénPan, JinshanThormann, EsbenRutland, Mark W.
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