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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.
Photocatalytic CO₂-to-formate/CO Conversion with Half-Metallocene p-Cymene Ruthenium(II) Catalyst
이대한,서윤정,최민수,김철훈,강상욱,손호진 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
This study details the photocatalytic CO₂-to-CO or formate conversion activities of two different photocatalytic systems (IrPE + (p-Cym)RuPE and IrP/TiO2/(p-Cym)RuP) to evaluate the catalytic behavior of homogeneous and heterogenized (p-Cym)Ru(II) catalyst, respectively. A single run photolysis of the mixed homogeneous system (IrPE + (p-Cym)RuPE) in the presence of 16.7 vol % TEOA exhibited a maximal turnover number (TON) of ~800 for 48 h with a product selectivity of formate (>79%), while the ternary hybrid system with TiO₂-immobilized (p-Cym)RuP showed the relatively higher and steady CO₂-to-CO and CO₂-to-formate conversion activities (a TON of > 1660 for 100 h). The mechanistic investigations along with photophysical and electrochemical studies suggests that the occurrence of MLCT ((p-Cym)RuI(bpy)]<SUP>+</SUP> → [(p-Cym)Ru<SUP>II</SUP>(bpy<SUP>•–</SUP>)]<SUP>+</SUP>) onto the electron-withdrawing n-type TiO₂ opens catalytic route toward (p-Cym)Ru<SUP>II</SUP>-COOH intermediate that results in CO₂-to-CO conversion.
Effect of stabilizer MgO on the properties of Na<sup>+</sup>-beta-aluminas
이대한,김진식,임성기 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Na<sup>+</sup>-beta-alumina is well known as an efficient sodium ionic conductor that can be used as the solid electrolyte of Na-based batteries. In this study, Na<sup>+</sup>-beta-aluminas were synthesized by solid state reaction according to MgO contents as stabilizer. Na<sup>+</sup>-beta-alumina specimens were synthesized by sodium concentration which molar ratio was [Na<sub>2</sub>O] : [Al<sub>2</sub>O<sub>3</sub>] = 1 : 5 and MgO contents were changed at 1.1 to 3.6wt.%. Each fabricated specimen was analyzed by X-ray diffraction (XRD), scanning electron microscopy(SEM) and ionic conductivity using impedance measurement.
이대한,최성한,최민수,나수원,김철훈,강상욱,손호진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Red light-sensitized squaraine (SQ) dyes were developed and incorporated into dye-sensitized catalyst (DSC) with the formula of SQ/TiO<sub>2</sub>/Cat, and their efficacies were evaluated in terms of performance on either water or carbon dioxide reduction. Pt nanoparticles or fac-[Re(4,4′-bis-(diethoxyphosphorylmethyl)-2,2′-bipyridine)(CO)<sub>3</sub>Cl] were used as each catalytic center within the DSC frame of SQ/TiO<sub>2</sub>/Pt (Type I) or SQ/TiO<sub>2</sub>/Re(I) (Type II). In order to convey the potential utility of SQ in low energy sensitization, the following catalytic reductions were carried out under selective lower energy irradiation (> 500 nm). Type I and II showed different catalytic performances, primarily due to the choice of solvent for each catalytic condition: hydrogenation was carried out in H<sub>2</sub>O, but CO<sub>2</sub> reduction in DMF, and SQ was more stable in aqueous acid condition for hydrogen generation than CO<sub>2</sub> reduction in DMF.
이대한,김필수,최민수,백창현,김철훈,강상욱,손호진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
A series of heteroleptic Ir(III) complexes functionalized with the two phosphonic acid (-PO<sub>3</sub>H<sub>2</sub>) groups (<sup>dfppy</sup>IrP, <sup>ppy</sup>IrP, <sup>btp</sup>IrP, and <sup>piq</sup>IrP) are prepared and anchored onto Re(I) catalyst (ReP)-loaded TiO<sub>2</sub> particles (TiO<sub>2</sub>/ReP) to build up a new IrP-sensitized TiO<sub>2</sub> photocatalyst system (IrP/TiO<sub>2</sub>/ReP). The photosensitizing behavior of the IrP series was examined in IrP/TiO<sub>2</sub>/ReP platform for photocatalytic CO<sub>2</sub>-to-CO conversion. The four IrP-based ternary hybrids showed increased conversion activity and durability than the corresponding homogeneous (IrP + ReP) and heterogeneous (IrP + TiO<sub>2</sub>/ReP) mixed systems. Among the four IrP/TiO<sub>2</sub>/ReP photocatalysts, the low energy light (> 500 nm)-active <sup>piq</sup>IrP immobilized ternary system (<sup>piq</sup>IrP/TiO<sub>2</sub>/ReP) exhibited the most durable conversion activity, giving a turnover number of ≥730 for 170 h.
이대한,한상수,김영혁,임성기 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
Crystal phases of Na+-β/β"-alumina electrolytes prepared by vapor-phase synthesis to resolve problemsassociated with solid-state reaction (i.e., Na2O loss at high sintering temperature and limitation toreducing the thickness) were analyzed. Na+-β/β"-alumina/YSZ composite was prepared by α- to β/β"-alumina phase conversion using sodium aluminate (i.e. Na2O source) from a α-alumina/YSZ sinteredsample by vapor-phase synthesis. A fabricated Na+-β/β"-alumina fully crystalized without any secondaryphase. Its bulk density increased with increasing YSZ content. A maximum ionic conductivity of1.8 10 2 S/cm at 350 C was obtained from a 50 wt.% YSZ-added specimen converted at 1500 C for fourhours.