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).


No. Subject Author Date Views
Notice 6/16 (Fri) Dr. Bok Yeop Ahn (Harvard University) ADMINI 2017.06.13 819
202 12/6 (Tue) Prof. KwangSup Eom (School of MSE, GIST) ADMINI 2016.12.02 923
201 [Special Seminar] 11/16(Wed), Dr. Seung-Kyun Kang (Dept. of MSE, University of Illinois at Urbana-Champaign) ADMINI 2016.11.16 925
200 11/14(Tue) Prof. Sangeun Chun (Dept. of MSE, Kyungpook National Univ.) ADMINI 2016.11.14 913
199 11/8(Tue) Dr. Nikolai Tsvetkov (EEWS, KAIST) ADMINI 2016.11.07 804
198 11/1(Tue) Prof. Seung Hwan Ko (Dept. of ME, Seoul National Univ.) ADMINI 2016.11.01 845
197 [Special Seminar] 10/19(Wed), Prof. Wei-Chuan Shih (Departments of Electrical & Computer Engineering, University of Houston) ADMINI 2016.10.18 776
196 10/18(Tue) Prof. Megumi Kawasaki (Dept. of MSE, Hanyang Univ.) ADMINI 2016.10.17 802
195 [Special Seminar] 10/11(Tue), Prof. Leon Abelmann (KIST Europe) ADMINI 2016.10.07 802
194 10/4(Tue) Prof. Junsuk Rho (Dept. of ME/CE, POSTECH) ADMINI 2016.10.04 941
193 10/4(Tue) KAIST Self-Assembly Symposium 2016 file ADMINI 2016.09.30 886
» [Special Seminar] 9/30(Fri) Mark Ediger (University of Wisconsin-Madison / Department of Chemistry) ADMINI 2016.09.30 802
191 9/27(Tue) Prof. Sungtae Shin (Dept. of DSP, Korea Univ. Sejong Campus) ADMINI 2016.09.23 1330
190 9/20(Tue) Dr. Sang Soo Han, (KIST) ADMINI 2016.09.19 1367
189 9/6(Tue) Prof. Seung Yong Park, (The Nelson Mandela African Institution of Science and Technology, Head of the Department of Materials and Energy Science and Engineering) ADMINI 2016.08.29 1828
188 [Special Seminar] 8/23(Tue) Prof. Ji Hwan Kim (MIT) ADMINI 2016.08.22 1452
187 8/2(Tue) KAIST International MSE Workshop 2016 ADMINI 2016.07.25 2308
186 [Special Seminar] 6/15(Wed) Prof. Chanho Pak (GIST) ADMINI 2016.06.10 1459
185 6/14(Tue) Prof. Haein Yim, (Department of Physics, Sookmyung Women's Univ.) ADMINI 2016.06.09 1509
184 6/7(Tue) Dr. Soongu Kwon, (Center for Nanoparticle Research, Seoul National Univ.& Institute for Basic Science) ADMINI 2016.06.02 1407
183 5/31(Tue) Prof. Dongmok Whang, (School of AMSE, Sungkyunkwan Univ.) ADMINI 2016.05.27 1246