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 12/4 (Tue) Prof. Doo Seok Jeong (Hanyang Univ., Department of MSE) ADMINI 2018.11.30 110
Notice Regular 11/27 (Tue) Prof. Seong-Jun Jeong (Soongsil Univ.) ADMINI 2018.11.26 110
Notice Regular 11/20 (Tue) Prof. Youn Soo Kim (Department of MSE, POSTECH) ADMINI 2018.11.19 167
Notice Special 11/14 (Wed) Prof. Hui-Ming Cheng (Director and Professor, Tsinghua University, IMR CAS) ADMINI 2018.11.13 144
Notice Special 11/20 (Tue) Prof. Alfonso H. W. Ngan (Department of Mechanical Engineering, University of Hong Kong) file ADMINI 2018.11.13 158
Notice Regular 11/13 (Tue) Dr. Kang-Wook Lee (SK Hynix) ADMINI 2018.11.13 106
Notice Regular 11/6 (Tue) Prof. Dongchan Jang (KAIST NQE) ADMINI 2018.11.02 179
Notice Special 11/2 (Fri) Dr. Sungbong Park (Intel Corporation) ADMINI 2018.10.30 207
276 Regular 10/30 (Tue) Dr. Myung-Il Park (Korea Technology Finance Corporation) ADMINI 2018.10.26 135
275 Regular 10/23 (Tue) Dr. Sang-Soo Han (H&P International Patent & Law Office) ADMINI 2018.10.19 125
274 Regular 10/2 (Tue) Prof. Dohwan Kim (Hanyang Univ.) ADMINI 2018.10.01 282
273 Regular 9/18 (Tue) Prof. Seong Jun Kang (Kyung Hee Univ.) ADMINI 2018.09.17 369
» Regular 9/11 (Tue) Dr. Byeongdu Lee (Argonne National Laboratory) ADMINI 2018.09.07 456
271 Regular 9/4 (Tue) Prof. Kibum Kang (Department of MSE, KAIST) ADMINI 2018.09.03 444
270 Regular 8/28 (Tue) Prof. Kyung-Min Kim (Department of MSE, KAIST) ADMINI 2018.08.24 524
269 Special 8/24 (Fri) Prof. Joel W. Ager III (UC Berkeley, Lawrence Berkeley National Laboratory) file ADMINI 2018.08.20 403
268 Special 8/23 (Thu) Prof. Jeehwan Kim (MIT, USA) file ADMINI 2018.08.20 344
267 Special 8/23 (Thu) Prof. YANGUANG LI (Soochow University) file ADMINI 2018.08.20 233
266 Special 7/25 (Wed) Dr. Chang Sub Kim (Department of MSE, MIT) ADMINI 2018.07.24 463
265 Special 7/13 (Fri) Prof. Dong Ryeol Whang (Johannes Kepler University Linz, Austria) file ADMINI 2018.07.09 439
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