신소재공학과

Seminar

Date 20180508 

MSE Regular Seminar



■ Title:  Nanomechanics for innovative structural materials

          
■ Speaker:  Prof. Ju-Young Kim (UNIST MSE)   

 

Date and Time:  5/8 (Tue) 16:00

 

■ Venue:  Applied Engineering Department (W1-1) Multimedia Lecture Hall (1st Floor)

 

 Host :  Prof. Byeongha Shin 

  

 Abstract :  Nanomechanics is a branch of nanoscience studying fundamental mechanical properties of materials at the nanometer scale. The essence of nanomechanics is that mechanical properties have been changed dramatically at the nano-scale, unlike general mechanical properties of materials at bulk-scale. Key mechanical properties for structures and devices with micron- and nanometer-sized features are essential to be measured at the appropriate scale, thereby taking into account the so-called size effect. One research topic on application of nanomechanics that we have been performing is ‘nanoporous gold (np-Au)’. The np-Au made by dealloying is composed of a bicontinuous network of ligaments and pores. This material has been extensively studied for catalyst, sensor, actuator and other applications due to its high surface-to-volume ratio. However, np-Au shows brittle behavior even though individual ligaments are composed of ductile metal, hence the mechanical properties of np-Au need further investigation for improved reliability. Many researches have been performed in various ways to resolve this issue. Firstly, the identification of whether or not np-Au structures itself are self-similar during ligament coarsening was carried out through 3D reconstruction by FIB tomography. In addition, methods to synthesize np-Au with various microstructures in terms of initial dislocation density, grain size, twin structures have been developed. We correlated microstructures and mechanical behavior of np-Au, which gives insight into development of innovative structural materials that are light, strong, and tough.

No. Subject Author Date Views
Notice 7/13 (Fri) Prof. Dong Ryeol Whang (Johannes Kepler University Linz, Austria) ADMINI 2018.07.09 10
Notice 6/5 (Tue) Prof. Sunghwan Lee (Baylor University) ADMINI 2018.06.05 216
Notice 5/29 (Tue) Prof. Sang Ho Oh (Yonsei Univ. College of Medicine) ADMINI 2018.05.29 216
Notice 5/15 (Tue) Prof. Myung Gil Kim (Dept. of Chemistry, Chung-Ang Univ.) ADMINI 2018.05.15 436
» 5/8 (Tue) Prof. Ju-Young Kim (UNIST MSE) ADMINI 2018.05.09 501
260 5/1 (Tue) Prof. Duk-Yong Yoon (KAIST MSE) ADMINI 2018.04.30 654
259 4/24 (Tue) Kyeong Ho Chang (CEO, Innox Advanced Materials) ADMINI 2018.04.23 557
258 4/10 (Tue) Prof. Ki Jun, Yu (Yonsei Univ., School of Electrical and Electronic Engineering) ADMINI 2018.04.09 644
257 4/3 (Tue) Master Byung-Gi Choi (Samsung Advanced Institute of Technology) ADMINI 2018.04.02 522
256 3/27 (Tue) Prof. Seungbum Hong (KAIST MSE) ADMINI 2018.03.26 491
255 3/20 (Tue) Prof. Jung In-Ho (Seoul National University, MSE) ADMINI 2018.03.20 363
254 3/13 (Tue) Prof. Jong-Beom Baek (School of Energy and Chemical Engineering, UNIST) ADMINI 2018.03.13 359
253 3/6 (Tue) Prof. Seok-Young Ryu (KAIST CS) ADMINI 2018.03.05 322
252 2/27 (Tue) Dr. Jin-Woo Han (NASA) ADMINI 2018.02.27 387
251 2/20 (Tue) Dr. Jae Beom Jang (Sungkyunkwan Univ) ADMINI 2018.02.19 352
250 2/8 (Thu) Prof. Pei-Chen Su (Nanyang Technological University) file ADMINI 2018.02.05 344
249 2/13 (Tue) Prof. Sungkyu Kim (Northwestern Univ) ADMINI 2018.01.31 424
248 1/9 (Tue) Dr. Choon Won Byeon, ETRI ADMINI 2018.01.09 445
247 12/23 (Sat) Prof. Liangbing (Bing) Hu/Univ. of Maryland file ADMINI 2017.12.22 465
246 11/28 (Tue) Dr. Woo-Jin Lee (Ministry of Science and ICT.) ADMINI 2017.11.24 1141