9:30 AM - 9:45 AM
[MIS31-02] TEM observation of dissolution process of sodium chlorate nanocrystals
Keywords:TEM, dissolution, nano, in-situ observation
1. Solubility-independent formation of polymorph.
2. Crystals do not dissolve smoothly but in a fluctuating manner.
3. New crystals form even in a totally dissolving system.
4. Ripening occurs but different from Ostwald ripening.
In case of Ostwald ripening, initially presenting larger particles grow as a result of dissolution of smaller particles. However, our observation shows that ripening occurs with accompanying formation of new crystals, i.e., most of the initial crystals is replaced by new crystals. In the presentation, we will show the difference of the dissolution process between in ionic liquid and water solutions, which can be observed by a special holder having a liquid cell for TEM observation.
 J. M. Yuk, J. Park, P. Ercius, K. Kim, D. J. Hellebusch, M. F. Crommie, J. Y. Lee, A Zettl, A. P. Alivisatos, High-resolution EM of colloidal nanocrystal growth using grapheme liquid cells. Science, 336, (2012) 61-64.
 H.-G. Liao, L. Cui, S. Whitelam, H. Zheng, Real-time imaging of Pt3Fe nanorod growth in solution. Science, 336 (2012) 1011-1014.
 D. Li, M. Michael, H. Nelsen, J. R. I. Lee, C. Frandsen, J. F. Banfield, J. J. De Yoreo, Direction-specific interactions control crystal growth by oriented attachment. Science, 336 (2012) 1014.
 M. H. Nielsen, S. Aloni, J. J. De Yoreo, In-situ TEM imaging of CaCO3 nucleation reveals coexistence of direct and indirect pathways, Science, 345 (2014) 1158.
 Kimura, Y., Niinomi, H., Tsukamoto, K. & Garcia-Ruiz, J. M. In-situ live observation of nucleation and dissolution of sodium chlorate nanoparticles by Transmission Electron Microscopy. J. Am. Chem. Soc., 136 (2014) 1762-1765.