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Simple Models for Complex Nonequilibrium Problems in Nanoscale Friction and Network Dynamics
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0003-2339-4068
2020 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This doctoral thesis investigates three different topics: How friction evolves in atomically thin layered materials (2D materials); How social dynamics can be used to model grand scale common-pool resource games; Benchmarking of various image reconstruction algorithms in atomic force microscopy experiments. While these topics are diverse, they share being complex out-of-equilibrium systems. Furthermore, our approach to these topics will be the same: using simple models to obtain qualitative information about a system's dynamics. In the case of atomically thin layered materials, we will be expanding on the influential Prandtl-Tomlinson model and obtain an improved model constituting a substantial improvement in the theoretical description of friction in these systems. In the context of social dynamics, we will introduce a novel model representing a new approach to consensus rates on social networks in relation to society spanning coordination problems. For the image reconstruction project, our ambition is to investigate a new method for recreating free-energy surfaces based on AFM experiment, however, for this project only preliminary results are included.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University , 2020. , p. 138
Keywords [en]
tribology, nanofriction, 2d materials, graphene, image reconstruction, social dynamics, common-pool resource, collective action, simple models
National Category
Physical Sciences Materials Engineering Sociology (Excluding Social Work, Social Anthropology, Demography and Criminology)
Research subject
Theoretical Physics
Identifiers
URN: urn:nbn:se:su:diva-186930ISBN: 978-91-7911-378-0 (print)ISBN: 978-91-7911-379-7 (electronic)OAI: oai:DiVA.org:su-186930DiVA, id: diva2:1504697
Public defence
2021-01-15, sal FB42, AlbaNova universitetscentrum, Roslagstullsbacken 21 and online via Zoom, public link is available at the department website, Stockholm, 14:00 (English)
Opponent
Supervisors
Available from: 2020-12-21 Created: 2020-11-30 Last updated: 2025-02-17Bibliographically approved
List of papers
1. Understanding the friction of atomically thin layered materials
Open this publication in new window or tab >>Understanding the friction of atomically thin layered materials
2020 (English)In: Nature Communications, E-ISSN 2041-1723, Vol. 11, no 1, article id 420Article in journal (Refereed) Published
Abstract [en]

Friction is a ubiquitous phenomenon that greatly affects our everyday lives and is responsible for large amounts of energy loss in industrialised societies. Layered materials such as graphene have interesting frictional properties and are often used as (additives to) lubricants to reduce friction and protect against wear. Experimental Atomic Force Microscopy studies and detailed simulations have shown a number of intriguing effects such as frictional strengthening and dependence of friction on the number of layers covering a surface. Here, we propose a simple, fundamental, model for friction on thin sheets. We use our model to explain a variety of seemingly contradictory experimental as well as numerical results. This model can serve as a basis for understanding friction on thin sheets, and opens up new possibilities for ultimately controlling their friction and wear protection.

National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-180481 (URN)10.1038/s41467-019-14239-2 (DOI)000511941200010 ()31964884 (PubMedID)
Available from: 2020-04-06 Created: 2020-04-06 Last updated: 2023-03-28Bibliographically approved
2. Thermal effects and spontaneous frictional relaxation in atomically thin layered materials
Open this publication in new window or tab >>Thermal effects and spontaneous frictional relaxation in atomically thin layered materials
(English)Manuscript (preprint) (Other academic)
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:su:diva-186927 (URN)
Available from: 2020-11-28 Created: 2020-11-28 Last updated: 2022-02-25
3. Dynamics of collective action to conserve a large common-pool resource
Open this publication in new window or tab >>Dynamics of collective action to conserve a large common-pool resource
(English)Manuscript (preprint) (Other academic)
National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-186926 (URN)
Available from: 2020-11-28 Created: 2020-11-28 Last updated: 2022-02-25

Open Access in DiVA

Simple Models for Complex Nonequilibrium Problems in Nanoscale Friction and Network Dynamics(22221 kB)1110 downloads
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Type fulltextMimetype application/pdf

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Andersson, David

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