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 5/30 (Tue) Prof. Chang Hyeon Ko (Sookmyung Univ) ADMINI 2017.05.26 36
198 11/1(Tue) Prof. Seung Hwan Ko (Dept. of ME, Seoul National Univ.) ADMINI 2016.11.01 678
197 [Special Seminar] 10/19(Wed), Prof. Wei-Chuan Shih (Departments of Electrical & Computer Engineering, University of Houston) ADMINI 2016.10.18 634
196 10/18(Tue) Prof. Megumi Kawasaki (Dept. of MSE, Hanyang Univ.) ADMINI 2016.10.17 650
195 [Special Seminar] 10/11(Tue), Prof. Leon Abelmann (KIST Europe) ADMINI 2016.10.07 661
194 10/4(Tue) Prof. Junsuk Rho (Dept. of ME/CE, POSTECH) ADMINI 2016.10.04 784
193 10/4(Tue) KAIST Self-Assembly Symposium 2016 file ADMINI 2016.09.30 725
» [Special Seminar] 9/30(Fri) Mark Ediger (University of Wisconsin-Madison / Department of Chemistry) ADMINI 2016.09.30 667
191 9/27(Tue) Prof. Sungtae Shin (Dept. of DSP, Korea Univ. Sejong Campus) ADMINI 2016.09.23 1192
190 9/20(Tue) Dr. Sang Soo Han, (KIST) ADMINI 2016.09.19 1218
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 1685
188 [Special Seminar] 8/23(Tue) Prof. Ji Hwan Kim (MIT) ADMINI 2016.08.22 1304
187 8/2(Tue) KAIST International MSE Workshop 2016 ADMINI 2016.07.25 2129
186 [Special Seminar] 6/15(Wed) Prof. Chanho Pak (GIST) ADMINI 2016.06.10 1307
185 6/14(Tue) Prof. Haein Yim, (Department of Physics, Sookmyung Women's Univ.) ADMINI 2016.06.09 1363
184 6/7(Tue) Dr. Soongu Kwon, (Center for Nanoparticle Research, Seoul National Univ.& Institute for Basic Science) ADMINI 2016.06.02 1261
183 5/31(Tue) Prof. Dongmok Whang, (School of AMSE, Sungkyunkwan Univ.) ADMINI 2016.05.27 1127
182 [Special Seminar] 6/8(Wed) Prof. Sunghwan Lee (Dept. of Mechanical Engineering, Baylor University) file ADMINI 2016.05.25 1254
181 5/17(Tue) Prof. Jin-Seong Park, (Division of MSE, Hanyang Univ.) ADMINI 2016.05.12 1260
180 5/10(Tue) Prof. Sei Kwang Hahn, (Dept. of MSE, POSTECH) ADMINI 2016.05.05 1264
179 5/3(Tue) Prof. Kwang Ho Kim, (School of MSE, Pusan National Univ.) ADMINI 2016.04.29 1205