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이대한,이성태,임성기 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
The addition of ZrO<sub>2</sub> to Na<sup>+</sup>-beta-alumina improve both fracture toughness and strength without compromising the superionic's electrical properties. ZrO<sub>2</sub> powder was added that the content of ZrO<sub>2</sub> may be in a range of 0 to 10 wt%. To prepare sintered ZrO<sub>2</sub> doped beta-alumina specimen, mixed matrix were sintered for 30 min at 1650°C. This effect of ZrO<sub>2</sub> dopant with pure beta-alumina has been investigated with microstructure and ionic conductivity.
Electron Injection Process of Porphyrin Dye into Heterogeneous TiO<sub>2</sub>/Re(I) Photocatalyst
이대한,최성한,최민수,나수원,김철훈,강상욱,손호진 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
The net hetero-collisional electron transfer from the non-anchored fluorescent porphyrin sensitizer to the TiO<sub>2</sub> catalytic particles was a major event during the initial stage of the catalysis. According to in situ UV-Vis absorption spectroscopy and mass analysis of dye solution filtered after photolysis, the initially added porphyrin dye experienced a significant photodegradation accompanied by a breakage of π-conjugation and loss of the bulky substituents. Acetyl- or ethyl-group modified porphyrins were prepared, respectively referred to as ZnP<sub>Acet</sub> and ZnP<sub>Et</sub>, and this modification elevated the corresponding excited-state energy levels when comparing ZnP with ZnP<sub>Et</sub>, consequently shortening the activity delay at the early stage of photolysis. Thus, chemical modification had a favorable effect on the photosensitizing and electron transportation abilities of the dye.
Reversible Mechanofluorochromic Luminescence of Molecular Assembly of o-Carborane
이대한,나수원,윤보선,김철훈,강상욱,손호진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
A new type of solid-state photochromism was observed in an AB2 type molecular assembly comprising the central silole and two peripheral o-carborane units, and depending on the assembling positions of those units at adjoining phenyl group two different conformational isomers were formed, namely Si-m-Cb and Si-p-Cb. Each isomer showed different solid-state photochromism depending on its solid state morphology, either in the crystalline or amorphous state. Photophysical studies on each isomer in the solid-state revealed that electronic interaction between silole and o-carborane units determined emission colors. The crystal and DFT optimized structures each accounting for the crystalline and amorphous structure, respectively, and correlated well to the electronic interaction on the molecular assembly in the solid state, thus enabling to predict solid state morphological change, vide infra.
Homoleptic Tris-Imidazo Phenanthridine Iridium(Ⅲ) Complexes for Stable Blue Phosphorescence
이대한,이상훈,서윤정,김소연,김진형,백창현,박기태,최성한,김철훈,강상욱,손호진 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
A serious 3-(2,6-Dimethylphenyl)-7-R-imidazo[1,2-f]phenanthridine-based C^N-cyclometalated Ir(III) complexes, tris[3-(2,6-Dimethylphenyl)-7-R-imidazo [1,2-f]phenanthridin-12-yl-κ C<SUP>12</SUP>,κ N<SUP>1</SUP>]iridium (DMP) where R groups, varied with H, Me, F, and CF3, were designed and synthesized, and their photophysical properties were determined and compared favorably with those estimated by the quantum calculations. From DFT calculations, there appeared to be a general trend for controlling the energy of DMP. HOMO energy was mainly contributed either by the iridium metal or the ortho-metallated phenyl imidazole unit of phenanthridine ligand and LUMO by the whole phenanthridine ligand. The 7-positional modification was more susceptible to LUMO contribution. But electronic alteration done by the serial groups, H, Me, F, and CF3, from electron-donating to -withdrawing groups reversed to a general trend that is to say following the energy being smaller for F and CF3 than H and Me.