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(80) Production(s) de GEORGE M.
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The crack tip: A nanolab for studying confined liquids 
Auteur(s): Grimaldi Antoine, George M., Pallares Gaël, Marliere Christian, Ciccotti Matteo
(Article) Publié:
Physical Review Letters, vol. 100 p.165505 (2008)
Ref HAL: hal-00411946_v1
PMID 18518217
DOI: 10.1103/PhysRevLett.100.165505
WoS: 000255457600051
Exporter : BibTex | endNote
26 Citations
Résumé: We study the equilibrium properties of a liquid phase condensed at the nanoscale between the surfaces of a sharp crack in fused silica in a moist controlled atmosphere. The extension of the condensed phase along the fracture is measured by in situ atomic force microscopy phase imaging and it is shown to be determined by a critical distance between the opposite crack surfaces, which is an increasing function of humidity. The present technique is very promising for measuring the properties of confined liquids at the nanoscale as well as for modeling the physics and chemistry of slow crack propagation in glasses.
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Dynamic condensation of water at crack tips in fused silica glass
Auteur(s): Ciccotti Matteo , George M., Ranieri V., Wondraczek L., Marliere Christian
(Article) Publié:
Journal Of Non-Crystalline Solids, vol. 354 p.564-568 (2008)
Texte intégral en Openaccess : 
Ref HAL: hal-00412153_v1
DOI: 10.1016/j.jnoncrysol.2007.06.090
WoS: 000252860800085
Exporter : BibTex | endNote
28 Citations
Résumé: Water molecules play a fundamental role in the physics of slow crack propagation in glasses. It is commonly understood that, during stress-corrosion, water molecules that move in the crack cavity effectively reduce the bond strength at the strained crack tip and, thus, support crack propagation. Yet the details of the environmental condition at the crack tip in moist air are not well determined. In a previous work, we reported direct evidence of the presence of a 100 nm long liquid condensate at the crack tip in fused silica glass during very slow crack propagation (10(-9)-10(-10) m/s). These observations are based on in situ AFM phase imaging techniques applied on DCDC glass specimens in controlled atmosphere. Here, we discuss the physical origin of the AFM phase contrast between the liquid condensate and the glass surface in relation to tip-sample adhesion induced by capillary bridges. We then report new experimental data on the water condensation length increase with relative humidity in the atmosphere. The measured condensation lengths were much larger than what predicted using the Kelvin equation and expected geometry of the crack tip.
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Mechanical Effets of a Nanometrie Liquid Condensate at Crack Tip in DcDc Specimen
Auteur(s): Grimaldi Antoine, Pallares Gaël, Ponson L., Marliere Christian, George M., Ciccotti Matteo
Conference: The 9 th ESG Conference Glass The Challenge for the 21 st Century (Trencin, Slovakia, FR, 2008-06-22)
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Damage in glass : post-mortem estimation of the process zone size
Auteur(s): Pallares Gaël, Rountree C., Ottina C., Bonamy Daniel, Bouchaud E., Ciccotti Matteo, George M.
Conference: Journées de la matière condensée (JMC11) (, FR, 2008-08-25)
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Mechanical effects of a nanometric liquid condensate at crack tip in DCDL specimen
Auteur(s): George M., Grimaldi Antoine, Pallares Gaël, Ponson L., Marliere Christian, Ciccotti Matteo
Conference: European conference of fracture (Brno, Czech Republic, FR, 2008-09-02)
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Condensation capillaire de fissure d'un verre de silice
Auteur(s): George M., Ciccotti Matteo, Grimaldi Antoine, Pallares Gaël, Marliere Christian
Conference: Journées inter UMR LCVN (Université Montpellier 2) et PPMD (ESPCI, Paris) (Montpellier, France, FR, 2008-09-11)
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Adhesion capillaire en tête de fissure dans un verre : étude par imagerie de phase AFM
Auteur(s): George M., Grimaldi Antoine, Pallares Gaël, Marliere Christian, Ciccotti Matteo
Conference: Forum des Microscopies à sonde locale 2007 (Troyes, France, FR, 2007-03-26)
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