| 학회 | 한국재료학회 |
| 학술대회 | 2010년 봄 (05/13 ~ 05/14, 삼척 팰리스 호텔) |
| 권호 | 16권 1호 |
| 발표분야 | F. Multiscale Materials, Theory and Phenomena(멀티스케일 재료, 이론 및 현상) |
| 제목 | Toughness of soft-hard composites and Wetting on Textured Substrates |
| 초록 | In the first part, after discussing works on nacre, a soft-hard composite found in nature, including a simulation on network mimicking nacre [1-4], we talk on a simple model of spider webs, another example of natural soft-hard structure [5]. We demonstrate that the web network is free of stress concentrations because the radial threads are stronger than the spiral threads. In the second part, after reviewing our works on wetting on textured surfaces [6-8], we discuss penetration into textured surface and instability of a liquid film on textured substrates during spin coating [9,10]. References [1] Ko Okumura and Pierre-Gilles de Gennes, Why is nacre strong? : Elastic theory and fracture mechanics for biocomposites with stratified structures, Eur. Phys. J. E 4 (2001) 121-127. [2] K. Okumura, Fracture strength of biomimetic composites: scaling views on nacre, J. Phys.: Condens. Matter 17 (2005) S2879-S2884. [3] Yukari Hamamoto and Ko Okumura, Analytical solution to a fracture problem in a tough layered structure, Phys. Rev. E 78 (2008) 026118-1--5. [4] Yuko Aoyanagi and Ko Okumura, Stress and displacement around a crack in layered network systems mimicking nacre, Phys. Rev. E 79 (2009) 066108. [5] Yuko Aoyanagi and Ko Okumura, A simple model for the mechanics of spider webs, Phys. Rev. Lett. 104, 038102 (2010); featured in, Philip Ball, Web designers, Nature Materials 9, 190 (2010). [6] C. Ishino, K. Okumura and D. Quéré, Wetting transitions on rough surfaces, Europhys. Lett. 68 (2004) 419-425. [7] C. Ishino and K. Okumura, Nucleation scenarios for wetting transition on textured surfaces: the effect of contact angle hysteresis, Europhys. Lett. 76 (2006) 464-470. [8] Chieko Ishino, Mathilde Reyssat, Etienne Reyssat, Ko Okumura and David Quere, Wicking in a forest of micro-pillars, Europhys. Lett. 79 (2007) 56005. [9] C. Ishino and K. Okumura, Wetting transitions on textured hydrophilic surfaces, Eur. Phys. J. E 25 (2008) 415-424. [10] Minako HAMAMOTO-KUROSAKI and Ko OKUMURA, On a moving liquid film and its instability on textured surfaces, Eur. Phys. J. E 30, 283–290 (2009). |
| 저자 | Ko Okumura |
| 소속 | Physics Department |
| 키워드 | soft - hard composites; Wetting; spider webs |
