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Séminaire Ko Okumura

Lifetime of a two-dimensional bubble, wetting on textured surfaces, and fracture of structured materials


Ko Okumura

Department of Physics
Ochanomizu University, Tokyo

I will talk about recent research activities on wetting and fracture. My talk will be derived from the following works :

1. A. Eri and K. Okumura, Lifetime of a two-dimensional air bubble, Phys. Rev. E 76 (2007) 060601 (Rapid Communication).

2. C. Ishino and K. Okumura, Wetting transitions on textured hydrophilic surfaces, Eur. Phys. J. E (accepted) ;

C. Ishino and K. Okumura, Nucleation scenarios for wetting transition on textured surfaces : the effect of contact angle hysteresis, Europhys. Lett. 76 (2006) 464 ;

C. Ishino, K. Okumura and D. Quéré, Wetting transitions on rough surfaces, Europhys. Lett. 68 (2004) 419 ;

C. Ishino, M. Reyssat, E. Reyssat, K. Okumura and D. Quéré, Wicking in a forest of micro-pillars, Europhys. Lett. 79 (2007) 56005.

3. K. Okumura and P.-G. de Gennes, Why is nacre strong ? Elastic theory and fracture mechanics for biocomposites with stratified structures, Eur. Phys. J. E 4 (2001) 121 ;

Y. Shiina, Y. Hamamoto and K. Okumura, Fracture of soft cellular solids − case of non-crosslinked polyethylene foam, Europhys. Lett. 76 (2006) 588 ;

S. Nakagawa and K. Okumura, Crack-tip stress concentration and mesh size in networks, J. Phys. Soc. Jpn. 76 (2007) 114801 ;

Y. Aoyanagi, Y. Shiina, and K. Okumura, Reinforcement of a material exploiting its internal structure (submitted) ;

Y. Hamamoto and K. Okumura, New analytical solution for a crack in layered structures mimicking nacre (submitted).