Korean Chemical Society American Chemical Society Materials Research Society

• 2001. 10. - present : Professor, Department of Chemistry, Sungkyunkwan Univerisity
• 1996. 10. - 2001. 9 : Associate Professor, Department of Chemistry, Sungkyunkwan Univerisity
• 1992. 9. - 1996. 9. : Assistant Professor, Department of Chemistry, Sungkyunkwan University
• 1991. 2. - 1992. 7. : AT&T Bell Laboratories, Murray Hill, NJ, USA Postdoctoral Member of Technical Staff. (Supervisor: M. L. Steigerwald)
• 1991 Ph.D. Iowa State University, Ames, IA, (Inorganic Chemistry, Adviser: John D. Corbett)
• 1987 M.S. Iowa State University, Ames, IA. (Inorganic Chemistry, Adviser : John D. Corbett)
• 1984 B.S. Seoul National University, Seoul, Korea. (Chemistry)
  

Mesoporous materials are porous materials that have pores of 2-50 nm in size. Because of the high surface area and size controllability, this class of materials has a great potential for many novel applications, especially in relation with the nanoscience and technology. While most of the presently reported mesoporous materials are synthesized in powder forms, we are interested in synthesizing mesoporous titania in thin films because thin films have many advantages over powder in utilizing the porous nature of this class of materials. We have recently shown that our mesoporous titania thin films have size selective transport properties with a threshold of 2 nm, and that these materials can be very versatiletemplates for the syntheses of arrays of nanowires or nanorods.

Suppose what is going to happen when you mix particles of opposite charges. If the particles are small to the atomic scale, you are going to obtain salts such as NaCl. Depending on the synthesis conditions, salts of various combinations of cations and anions form. Then, what if the particles are larger than simple ions like Na⁺ or Cl^- ? Through a series of papers, our group has demonstrated that electrostatic interactions between charged nano-sized particles can be a viable means to form a new class of composite materials. Now, the size of particles canbe as large as 1 micrometer. There are some many issues to be clarified in these materials in terms of the fundamental chemistry and physics. Also, there are several important directions for this class of new materials including new catalysts, sorption materials, and membrane materials.

1. Jung Ho Son, Young-Uk Kwon, and Oc Hee Han, "New Ionic Crystals of Oppositely Charged Cluster Ions and Their Characterization", Inorg. Chem. 2003, 42(13), 4153 4159.
2. Young Kyu Hwang, Kyoung-Chul Lee and Young-Uk Kwon, "Nanoparticle routes to mesoporous titania thin films", Chem. Commun. 2001, 1738.
3. J.-H. Son, H. Choi, Y.-U. Kwon, Porous Crystal Formation from Polyoxometallate Building Blocks: Single Crystal Structure of [AlO4Al12(OH)24(H2O)12]Al(OH)6MoO182 29.5H2O, J. Amer. Chem. Soc. 2000, 122, 7432.
4. H. Choi, Y.-U. Kwon, O. H. Han, Nanocomposite gels between [V10O28]6- and [AlO4Al12(OH)24(H2O)12]7+ Polyoxometalate Clusters, Chem. Mater. 1999, 11, 1641.
5. Hyuk Choi, Yoon-Young Chang, Young-Uk Kwon, and Oc Hee Han, "Incorporation of decavanadate ions into silica gels and mesostructured silica walls", Chem. Mater. 2003, 15, 3261-3267.