Adhesion - ESPCI Paris€¦ · 2 Anatase – UV irradiation-30-20-10 0 10 F/ 2 π R [10-5 J. m-2] 0...
Transcript of Adhesion - ESPCI Paris€¦ · 2 Anatase – UV irradiation-30-20-10 0 10 F/ 2 π R [10-5 J. m-2] 0...
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Adhesion
E. BarthelSeptember 2008
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Recent review
Adhesive Elastic Contact – JKR and more, E. Barthel, J. Phys. D: Appl. Phys. 41 (2008) 163001
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Cleaning windows…
Paris, Quai d’Orsay, August 23, 2008
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Self cleaning
TiO2
Water
5 µm
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Optical functionalisation
AgZnO
ZnO50 nm
Verre
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22Damage morphology
damage morphology
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Windshield – laminated glass
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Laminated glass – impact testing
Standard test EN 356 :ball 4 kg / 8 m / 2 times
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Glass strengthening
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Brittleness isfascinating
Afasia 1Arcangelo SassolinoParis, Palais de Tokyo, August 2008
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Lengthscales issue
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Outline
Surfaces and interactions – adhesionMechanics at the local scale – crack tip
stressesMechanics at the macroscopic scale – remote
loading
Part I
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Part I – Interaction stresses
1 Measuring the interactionsa) Surface forcesb) Derjaguin approximationc) Derjaguin approximation – Adhesion
2 Interactions and critical stressa) various interactionsb) critical (rupture) stress
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I.1.a) Surface forces measurement
AFM – contact force modeLiquid medium
d[nm]
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Classical force curve
40
30
20
10
0
-10
-20
-30
Def
lect
ion
Sign
al [n
m]
12080400Seperation [nm]
approach retract
Before irradiation
Jump to contact
Separation [nm]
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Interaction potential – Interaction stresses
z z
(z) (z)
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I.1.b) Derjaguin Approximation
δ
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I.1.c) Derjaguin Approximation –Adhesion
Pull out force
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1932 Bradley1932
d1
d2
with silica spheres
sous vide…préhistorique
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Scaling issues – small is… sticky
macroscopic forcesgravity but alsoinertiaaerodynamics
surface forces
The cut-off distance is about 1 mm !…equal to a capillary length
…strange
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I.2.a) Example: van der Waals forces
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TiO2 Anatase – UV irradiation
-30
-20
-10
0
10
F/2π
R
[10
-5 J
.m-2
]
200150100500
Irradiation time [mn]
12
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2
0F/
2πR
[1
0-5 J
.m-2
]250200150100500
Sample-tip separation [nm]
Irradiation time
Before UV 5 mn UV 15 mn UV 30 mn UV
Ramzi Jribi, PhD thesis
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Very short range surface forces measurements
Lantz, Science,291(2001) 2580
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I.2.b) Rupture stress
Interaction potential
Rupture
OrowanKohn Sham 1974
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orders of magnitude – adhesion energies and critical (rupture) stresses
Part II
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Irwin ERR Intro
J. Appl. Mech.1957
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Part II – remote loading
Crack propagation – Energy release rate1) Linear system
a) Peel test and asymmetric vs symmetric peelb) DCB measurement for thin filmsc) crack deflection
2) Non linear systema) hertzian contactb) adhesion and elastic deformation: Derjaguin 1934 II
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Crack propagation – Energy release rate
Energy release rate
Equilibrium
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II.1.a) 90° Peel test
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II.1.a’) (A)symmetric peel test – Elastic stripethylene propylene rubber / PMMA + thin EPR film10 cm wide / 12 mN / applied 60 mna: no propagation / b: crack speed 2 µm/s
K. Kendall, J Adhes Sci Technol 8 (1994) 1271
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II.1.b) The Double Cantilever Beam (DCB)
L
δ
Epoxy gluebond layer
OpticalmultilayerSubstrate
Backing
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A1
II.1.b) The Double Cantilever Beam (DCB)
Linear system
Energy release rate
or
Impacts the stability
with
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DCB adhesion energy measurement
Side view
Top view
Actuator Blade holder Sample Sampleholder
Blade Sample
Ruler
experimental set-up
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DCB – results
6x104
5
4
3
2
1
0
δ2 (µm
2 )
8x1066420(L+0.64h)4 (mm4)
w = 2.4 J/m2
w = 0.8 J/m2
Obreimov, Kanninen
Barthel et al. Thin Solid Films, 2005
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Indentification of the interfaces - XPS5x10
4
4
3
2
1
0
Cou
nts
600 500 400 300 200Binding Energy (eV)
Ag
3d
Ag
3pZn
AugerO
1s
backingside
substrateside
Ag
ZnO
ZnO
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// is the locus of failure
1 Glass / Si3N4 // Ag / ZnO 0,7 J/m2 ± 0,2 (2 s.)
2 Glass / ZnO // Ag / ZnO 1,5 J/m2 ± 0,2 (2 s.)
3 Glass / TiO2 / Ag // ZnO 2,1 J/m2 ± 0,7 (3 s.)
4 Glass / SnO2 / Ag // ZnO 2,4 J/m2 ± 0,1 (3 s.)
underlayer
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Deposition is not at equilibriumSilver on oxide:
Ambiant Temperature
High
Temperature
History matters:
Ag does not wet ZnO; ZnO wets Ag
cf also Lin and Bristowe PRB 2007
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Adhesion – crack propagation in structured interfaces
Sample A : Single Scratch Sample B : Multi scratch
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Dalmas et al. 2009
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II.1.c) A more complex examplecrack deflection (kink)
Cook-Gordon 1964, Kendall 2004
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Thin film – instability under sliding contact
X. Geng, PhD
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II.2) Adhesive contact
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II.2.a) Hertz contact
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II.2.b) Derjaguin 1934 Part II
Energy
Penetration and forceDerjaguin,Kolloid Z., 69, 155 (1934)
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Derjaguin 1934 Part II
Pull out force
Part III