신소재공학과

Seminar

Date 20160930 


▣ Special Seminar ▣

 


- TopicControl of molecular orientation, thermal stability, and photochemical stability in vapor-deposited organic glasses


- Speaker: Mark Ediger (University of Wisconsin-Madison / Department of Chemistry)


- Date: 2016. 9. 30(Fri16:00~


- Venue: KAIST Applied Engineering B/D(W1) #1317


- HostProf. Sang Ouk Kim


- Abstract


We have used physical vapor deposition and the mobility of glassy surfaces to prepare what are likely the most stable glasses on the planet.(1) These materials have the properties expected for million-year-old glasses, including high density and high mechanical moduli.(2) Surprisingly, these glasses melt like crystals, with a constant velocity transformation front.(3) In addition, they resist photochemical degradation better than liquid-cooled glasses. Molecular orientation in vapordeposited glasses can be highly anisotropic.(4) These properties all depend systematically on the substrate temperature during deposition and can be measured efficiently with high throughput spectroscopic ellipsometry.(5)


The interesting properties of vapor-deposited glasses arise from the high mobility of glass surfaces. During deposition, molecules near the free surface have the opportunity to sample many different packing arrangements. This mechanism allows the molecular orientation in vapor-deposited glasses to be predicted from molecular dynamics computer simulations(4, 6) and could be useful for optimizing the performance of organic light emitting diodes (OLEDs).


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210 3/21 (Tue) Prof. Park Sang Duk (Seoul National University) ADMINI 2017.03.20 111
209 3/14 (Tue) Dr. Hwa Nyun Kim (LG) ADMINI 2017.03.11 169
208 3/7(Tue) Prof. Joong Keun Park, Prof. Jung Yong Lee (KAIST) ADMINI 2017.03.02 191
207 02/28 (Tue) Prof. Steve Park (KAIST) ADMINI 2017.02.24 347
206 02/20 (Mon) Special Seminar Announcement, Prof. Hwang (Seoul National University) ADMINI 2017.02.14 408
205 02/08 (Wed) Special Seminar Announcement, Dr. Yong Ho Kang, UC Santa Barbara ADMINI 2017.02.02 602
204 [Special Seminar] 12/23(Wed), Dr. Jaejin Kim (Chemical Sciences and Engineering Division, Argonne National Laboratory) ADMINI 2016.12.16 622
203 12/13(Tue) Dr. Jae Yong Song (KRISS) ADMINI 2016.12.12 618
202 12/6 (Tue) Prof. KwangSup Eom (School of MSE, GIST) ADMINI 2016.12.02 591
201 [Special Seminar] 11/16(Wed), Dr. Seung-Kyun Kang (Dept. of MSE, University of Illinois at Urbana-Champaign) ADMINI 2016.11.16 582
200 11/14(Tue) Prof. Sangeun Chun (Dept. of MSE, Kyungpook National Univ.) ADMINI 2016.11.14 587
199 11/8(Tue) Dr. Nikolai Tsvetkov (EEWS, KAIST) ADMINI 2016.11.07 473
198 11/1(Tue) Prof. Seung Hwan Ko (Dept. of ME, Seoul National Univ.) ADMINI 2016.11.01 508
197 [Special Seminar] 10/19(Wed), Prof. Wei-Chuan Shih (Departments of Electrical & Computer Engineering, University of Houston) ADMINI 2016.10.18 483
196 10/18(Tue) Prof. Megumi Kawasaki (Dept. of MSE, Hanyang Univ.) ADMINI 2016.10.17 482
195 [Special Seminar] 10/11(Tue), Prof. Leon Abelmann (KIST Europe) ADMINI 2016.10.07 515
194 10/4(Tue) Prof. Junsuk Rho (Dept. of ME/CE, POSTECH) ADMINI 2016.10.04 647
193 10/4(Tue) KAIST Self-Assembly Symposium 2016 file ADMINI 2016.09.30 579
» [Special Seminar] 9/30(Fri) Mark Ediger (University of Wisconsin-Madison / Department of Chemistry) ADMINI 2016.09.30 543