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I-23 : Generalized Synthesis of Monodisperse Nanoparticles and Uniform-sized Nanorods
현택환 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
We developed a new generalized synthetic procedure to produce monodisperse nanocrystals of many transition metals, metal oxides, and metal sulfides without a size selection process. Highly-crystalline and monodisperse nanocrystals were synthesized from the thermal decomposition of metal-sufactant complexes. So far, we have synthesized monodisperse spherical nanocrystals of Fe, Co, magnetite, cobalt ferrite, manganese ferrite, Ni, MnO, Pd, zirconia, and Au. Very recently, we were able to synthesize 40 gram of monodisperse magnetite nanoparticles without going through a size selection process using inexpensive and environmentally-friendly reagents. By controlling the nucleation and growth processes, we were able to synthesize monodisperse magnetite nanoparticles with particle sizes of 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16 nm. We developed a new generalized synthetic procedure to produce various nanorods. Diameter-controlled synthesis of magnetic nanorods was achieved. So far we have synthesized nanorods of iron, iron oxide, iron phoshpide, cobalt phosphide, manganese phosphide, ZnO, and ZnS. Multi-gram scale synthesis of CdS, ZnS, PbS, and MnS were achieved.
Synthesis and Applications of New Nanoparticular and Nanoporous Materials
현택환,김상욱,이진우,주진,한상진,박종남 한국공업화학회 2002 한국공업화학회 연구논문 초록집 Vol.2002 No.0
We have developed new synthetic procedures to fabricate monodisperse magnetic nanocrystallites. Monodisperse and highly crystalline magnetic nanoparticles were fabricated without a size selection process, which is very important for large-scale production of the materials. Particle size can be varied from 2 nm to 20 nm by controlling the experimental parameters. TEM images of the particles showed 2-dimensional and 3-dimensional assembly of particles, demonstrating the uniformity of these nanoparticles. We fabricated novel iron nanorods with dimensions of 2 nm (thickness) * 8 nm (length), 2 nm * 12 nm, 2 nm * 20 nm, and 2 nm * 36 nm from the controlled growth of uniform 2 nm sized spherical nanoparticles. These iron nanorods exhibited high shape anisotropy. The synthesis and magnetic characterization of these nanoparticles will be presented.We have developed new synthetic procedures to fabricate various nanoporous carbons using nanostructured silica materials as templates. Nanoporous carbons with extremely high mesopore volumes and surface areas have been produced using silica nanoparticles as templates. These nanoporous carbons exhibited excellent adsorption capacities for bulky dyes. Mesoporous carbons with regular 3-dimensionally interconnected ~2 nm pore arrays have been synthesized using aluminum substituted MCM-48 and HMS mesoporous silicas as templates. The mesoporous carbons exhibited excellent performance for electrochemical double layer capacitors (EDLC). Using mesocellular silica foams as templates, mesocellular carbon foams composed of uniform cells with diameter of ~30 nm and window size of ~15 nm were fabricated. New heterogeneous catalysts employing chiral ligands immobilized on mesoporous silicas were developed. These heterogeneous catalysts were successfully applied in the various asymmetric catalytic reactions. The first heterogeneous catalyst for Pauson-Khand reaction (PKR) has been developed. The catalyst is cobalt supported on mesoporous SBA-15 silica. The catalyst can be reused many times without losing its catalytic activity, which is very important for large-scale production.
현택환 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Over the last 10 years, our laboratory has focused on the designed chemical synthesis, assembly and applications of uniform-sized nanocrystals.We developed a generalized procedure called as the “heat-up process” for the direct synthesis of uniform-sized nanocrystals. Furthermore we assemble these uniform-sized nanocrystals to fabricated multifunctional nanostructured materials and apply them to medicine and energy. Using 3 nm-sized iron oxide nanoparticles, new non-toxic MRI contrast agent was realized for high resolution MRI of blood vessels down to 0.2 mm. We fabricated tumor pH-sensitive magnetic nanogrenades composed of self-assembled iron oxide nanoparticles and pH-responsive ligands for theranostic application. We reported the large-scale synthesis of oxide/carbon nanocomposite materials with various structures and used them to lithium ion battery anodes. We have demonstrated Galvanic replacement reactions in oxide nanocrystals to produce hollow mixed metal oxide nanoparticles.