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DTSTAMP:20260425T181346Z
UID:1752656400@ist.ac.at
DTSTART:20250716T110000
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DESCRIPTION:Speaker: Juan Sobarzo Ponce\nhosted by Samara Ren\nAbstract: Tr
 ibocharging\, or contact electrification\, is the phenomenon in which two 
 initially neutral materials exchange electric charge through contact and s
 ubsequent separation. While it is widely observed in everyday life and cru
 cial to numerous natural processes\, even the most basic aspects of triboc
 harging are still a mystery—what are the charge carriers involved and wh
 at drives their exchange? This work spans three separate projects that add
 ress different aspects of tribocharging. First\, I introduce a novel strat
 egy combining finite-element method (FEM) simulations with Kelvin Probe Fo
 rce Microscopy (KPFM) to quantitatively extract surface charge density fro
 m surface voltage maps. Second\, I present a simple theoretical model that
  allows for the existence of triboelectric cycles\, under the assumption t
 hat multiple charge carrying species are involved. Third\, I present exper
 imental evidence that identical materials can spontaneously evolve into a 
 triboelectric series\, driven by contact history. Modeling this behavior e
 nables the replication of experimental results with simulations\, and even
  experimentally forcing the appearance of a pre-designed series by manipul
 ating contact history. Together\, the findings from these projects challen
 ge traditional views on tribocharging\, provide new tools for probing it\,
  and open up new avenues of research —all with the hopes of bringing us 
 closer to understanding this puzzling phenomenon.
LOCATION:Sunstone Bldg / Ground floor / Big Seminar Room A (I23.EG.102) 	\,
  ISTA
ORGANIZER:
SUMMARY:Juan Sobarzo Ponce: Thesis Defense: Tribocharging of identical insu
 lators: triboelectric series\, triboelectric cycles and surface charges
URL:https://talks-calendar.ista.ac.at/events/5915
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