Please enable JavaScript.
Coggle requires JavaScript to display documents.
Paper review (Why is triboelectricity poorly understood? (Originates from…
Paper review
Why is triboelectricity poorly understood?
Triboelectric series
Originates from rare events
Difficult to observe at nanoscale
Surface morphology dependent
Nanoasperities contact
Non-equilibrium system
Dissipation of mechanical energy
Mechanochemistry
Bond breaking
What is the charge carrier species?
Electrons
Metals
Insulation layer ignored
Insulators
Electrochemical redox
Electroplating
Ultra-high vacuum
Ions
PDMS dots - gold experiement
O-OH mainly
Atmosphere
Change polarity of surface after surface are separated
Zeta potential as new triboseries
Poor correlation
PS more negative than PTFE
Other
Mechanochemistry
Mechanical formation of radicals
Electrochemistry measurments
Radical scavengers
MFM
Surface roughness
Mosaic of positive and negative
EDX contact area
Polarity reversal
Contact force
Material transfered
Mechanical strain
Rubber vs stretched rubber
Relation to materials properties
Only related in specific conditions
Properties
Hammett constant
pKa
Surface hydrophilicity
Roughness
Hardness
What is useful for us
Measurement technique for charge
Non-contact measurement
Electric field induced second-harmonic generation
Determine which charge carrier
Optimise material properties of that carrier
Why do identical materials charge?
PDMS cut in half in glove box
Surface patterns/nanoroughness
Why does the voltage amplifies over time?
Mutually reinforced dipole moment
Author's view
Conclusions
Multiple charging process at multiple timescales
Competing and unstable dynamic process