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SUMMARY:Structual superlubricity and curved surfaces
DTSTART:20260914T133000Z
DTEND:20260914T150000Z
DTSTAMP:20260908T223700Z
UID:indico-event-9818@indico.fysik.su.se
DESCRIPTION:Speakers: Astrid de Wijn (NTNY Trondheim)\n\nStructural superl
 ubricity is a phenomenon where surfaces that are structurally different o
 n the atomic level have extremely low friction. It has been shown in many
  different combinations of materials in well-controlled lab settings\, for
  example with AFM. Real surfaces\, however\, are rough\, not atomically f
 lat\, and this is generally believed to dramatically reduce or destroy th
 e effect.We have investigated\, numerically and analytically\, how a the c
 urvature of a contact asperity impacts structural superlubricity [1].  W
 e show that there is no fundamental theoretical reason why a sufficiently 
 gently curved surface could not exhibit structural superlubricity. We inv
 estigate this in more detail using molecular-dynamics simulations of a si
 mple contact under nonuniform pressure. We find that the nonuniform distr
 ibution of pressure in fact aids superlubricity and reduces friction in g
 eneral. This opens up possibilities for multi-contact superlubricity in m
 ore realistic settings on non-flat surfaces. However\, here\, wear and co
 ating failure also become important. We also explored how collective effe
 cts on patterned surfaces with curved contactscan lead to damage and destr
 oy superlubricity [2]. I will discuss how thegeometry of surface patterns 
 could be used to improve this [3].[1] Nonuniform pressure helps structural
  superlubricity\,Melisa M. Gianetti\, Viet Hung Ho\, Bjørn Haugen\, Graha
 m Cross\, Astrid S. de Wijn\,https://arxiv.org/abs/2607.15967[2] A Theoret
 ical Study on Friction of Macroscale Patterned Surfaces: Implications for 
 Scaling Up Superlubricity\,Viet Hung Ho\, Melisa M. Gianetti\, Ahmed Uluca
 \, Aaron D. Sinnott\, Bjørn Haugen\, Graham L. W. Cross\, and Astrid S. d
 e Wijn\,ACS Appl. Mater. Interfaces 2025\, 17\, 40\, 56661–56671. [3] Di
 rectional commensurability stabilizes structural superlubricity in pattern
 ed mesoscale interfaces\,Viet Hung Ho\, Ge Li\, Melisa M. Gianetti\, Bjør
 n Haugen\, Graham L. W. Cross\, Astrid S. de Wijn\,https://arxiv.org/abs/2
 608.29141\nZoom link: https://stockholmuniversity.zoom.us/j/622224375\n\n
 https://indico.fysik.su.se/event/9818/
LOCATION:Albano Building 3
URL:https://indico.fysik.su.se/event/9818/
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