신소재공학과

Seminar

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Date 20180911

MSE Regular Seminar



■ Title :  Small Angle X-ray Scattering Studies of Colloidal Particles and their Assemblies

 

■ Speaker :  Dr. Byeongdu Lee (Argonne National Laboratory)  

 

■ Date and Time :  9/11 (Tue) 16:00

 

■ Venue :  Applied Engineering Buliding (W1) 1st Floor, Multimedia Seminar Room

 

 Host :  Prof. Seung-Beom Hong

  

 Abstract : Small angle x-ray scattering (SAXS) is an x-ray scattering technique that measures x-ray diffraction or scattering from nanostructured samples without altering samples for enhancing the signal. While it has been considered as a low resolution technique for certain research fields, for example protein shape analysis in solution, it used to provide reliable and conclusive evidence in self-assembly studies although may not be as effective as in molecular crystallography. Like other scattering techniques, its accuracy and applicability are highly depending on quality of samples and performance of instruments. Advanced control over nanoscale chemistries coupled with powerful synchrotron x-ray source provides new opportunities for SAXS, and researchers are taking a full advantage of its power.[1-4] In the first part of my presentation, I will briefly introduce SAXS of the Advanced Photon Source, which is one of the brightest x-ray source, for materials research.

In the second part, I will present some recent understandings of DNA engineered nanoparticle assembly. In the project, we have used DNA as a ligand and grafted the molecules on nanoparticles of which kinds could be geometrically and chemically diverse. The DNA molecules on the particles hybridize with ones on other particles according to the programmed base-paring code, resulting in unique self-assembled structures. We recently proved that the polyelectrolytes can provide not only attractive hybridization interaction but also repulsive interaction that had often been neglected. [5] It, however, turns out that understanding the repulsive interaction is crucial to rationalize detailed structural features of the DNA-nanoparticle assemblies. Theoretical studies on the interaction potentials will enable us better understanding the phase behaviors of DNA grafted nanoparticles that might be analogous to those of metal alloys or ionic salts.

 

1. H. Zhang, B. Lee, D. V. Talapin et al., Nature, 542, 328-331.

2. T. Li, A. J. Senesi, and B. Lee et al., Chem. Rev., 2016, 116 (18), pp 11128–11180.

3. M. N. O'Brien, M. R. Jones, B. Lee, C. A. Mirkin, Nature Materials, 2015, 14, 833.

4. S. G. Kwon, B. Lee, E. V. Shevchenko et al., Nature Materials, 2015, 14, 215–223.

5. R. J. Macfarlane, B. Lee, C. A. Mirkin et al., Science, 2011, 334, 6053, 204-208


List of Articles
No. Category Subject Author Date Views
Notice Regular 10/2 (Tue) Prof. Dohwan Kim (Hanyang Univ.) ADMINI 2018.10.01 156
Notice Regular 9/18 (Tue) Prof. Seong Jun Kang (Kyung Hee Univ.) ADMINI 2018.09.17 276
» Regular 9/11 (Tue) Dr. Byeongdu Lee (Argonne National Laboratory) ADMINI 2018.09.07 358
Notice Regular 9/4 (Tue) Prof. Kibum Kang (Department of MSE, KAIST) ADMINI 2018.09.03 362
Notice Regular 8/28 (Tue) Prof. Kyung-Min Kim (Department of MSE, KAIST) ADMINI 2018.08.24 387
Notice Special 8/24 (Fri) Prof. Joel W. Ager III (UC Berkeley, Lawrence Berkeley National Laboratory) file ADMINI 2018.08.20 341
268 Special 8/23 (Thu) Prof. Jeehwan Kim (MIT, USA) file ADMINI 2018.08.20 259
267 Special 8/23 (Thu) Prof. YANGUANG LI (Soochow University) file ADMINI 2018.08.20 166
266 Special 7/25 (Wed) Dr. Chang Sub Kim (Department of MSE, MIT) ADMINI 2018.07.24 390
265 Special 7/13 (Fri) Prof. Dong Ryeol Whang (Johannes Kepler University Linz, Austria) file ADMINI 2018.07.09 378
264 Regular 6/5 (Tue) Prof. Sunghwan Lee (Baylor University) ADMINI 2018.06.05 560
263 Regular 5/29 (Tue) Prof. Sang Ho Oh (Yonsei Univ. College of Medicine) ADMINI 2018.05.29 550
262 Regular 5/15 (Tue) Prof. Myung Gil Kim (Dept. of Chemistry, Chung-Ang Univ.) ADMINI 2018.05.15 762
261 Regular 5/8 (Tue) Prof. Ju-Young Kim (UNIST MSE) ADMINI 2018.05.09 676
260 Regular 5/1 (Tue) Prof. Duk-Yong Yoon (KAIST MSE) ADMINI 2018.04.30 818
259 Regular 4/24 (Tue) Kyeong Ho Chang (CEO, Innox Advanced Materials) ADMINI 2018.04.23 707
258 Regular 4/10 (Tue) Prof. Ki Jun, Yu (Yonsei Univ., School of Electrical and Electronic Engineering) ADMINI 2018.04.09 795
257 Regular 4/3 (Tue) Master Byung-Gi Choi (Samsung Advanced Institute of Technology) ADMINI 2018.04.02 672
256 Regular 3/27 (Tue) Prof. Seungbum Hong (KAIST MSE) ADMINI 2018.03.26 632
255 Regular 3/20 (Tue) Prof. Jung In-Ho (Seoul National University, MSE) ADMINI 2018.03.20 520
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