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우관주,황보연,손수현,박성수 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Monoclinic crystalline bismuth vanadate (BiVO<sub>4</sub>) is a bright yellow pigment with thermochromic property. In this study, metal doped BiVO<sub>4</sub> powdes was prepared from the mixture of bismuth nitrate (Bi(NO<sub>3</sub>)<sub>3</sub>) solution and ammonium vanadate (NH<sub>4</sub>VO<sub>3</sub>) at different reaction temperature with the dope of Mg and Cu by hydrothermal method. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transformiInfrared (FT-IR), UV-Vis spectrophotometer (UV-Vis), differential thermal analysis (DTA), and color difference meter.
금속이 도핑된 BiVO<sub>4</sub> 분말의 수열 합성 및 이의 열 변색 특성
우관주,손대희,진영읍,이근대,박성수,Wu, Guan Zhu,Son, Dae Hee,Jin, Young Eup,Lee, Gun-Dae,Park, Seong Soo 한국공업화학회 2015 공업화학 Vol.26 No.6
본 연구에서는 열 변색 물질로 알려진 순수한 $BiVO_4$ 분말과 금속이 도핑된 $M-BiVO_4$ (M = Mg, Cu) 분말들을 bismuth nitrate ($Bi(NO_3)_3$)와 ammonium vanadate ($NH_4VO_3$)의 혼합 수용액으로부터 고압반응기에서 수열 합성법을 통하여 성공적으로 제조하였다. 시료들의 결정구조, 미세구조 및 열 변색 특성들은 FE-SEM, FT-IR, XRD, DSC, UV-Vis-NIR 분광기 및 colorimeter를 이용하여 분석하였다. 시료를 상전이 온도 이상으로 가열시키면, 순수한 $BiVO_4$ 시료에 비하여 $M-BiVO_4$ (M = Mg, Cu) 시료의 색상이 상대적으로 선명하게 열 변색하였다. In this study, pure $BiVO_4$ powder and metal-doped $M-BiVO_4$ (M = Mg, Cu) powder, well known as thermochromic materials, were prepared from a mixed aqueous solution of bismuth nitrate ($Bi(NO_3)_3$) and ammonium vanadate ($NH_4VO_3$) in autoclave by hydrothermal method. The crystal structure, microstructure, and thermochromic property of samples were analyzed using FE-SEM, FT-IR, XRD, DSC, UV-Vis-NIR spectroscopy and colorimeter. When heating samples above phase transition temperature, the color of $M-BiVO_4$ (M = Mg, Cu) sample was thermally changed more clearly than that of using only pure $BiVO_4$ sample.
금속이 도핑된 BiVO4 분말의 수열 합성 및 이의 열 변색 특성
우관주 ( Guan Zhu Wu ),손대희 ( Dae Hee Son ),진영읍 ( Young Eup Jin ),이근대 ( Gun Dae Lee ),박성수 ( Seong Soo Park ) 한국공업화학회 2015 공업화학 Vol.26 No.6
In this study, pure BiVO4 powder and metal-doped M-BiVO4 (M = Mg, Cu) powder, well known as thermochromic materials, were prepared from a mixed aqueous solution of bismuth nitrate (Bi(NO3)3) and ammonium vanadate (NH4VO3) in autoclave by hydrothermal method. The crystal structure, microstructure, and thermochromic property of samples were analyzed using FE-SEM, FT-IR, XRD, DSC, UV-Vis-NIR spectroscopy and colorimeter. When heating samples above phase transition temperature, the color of M-BiVO4 (M = Mg, Cu) sample was thermally changed more clearly than that of using only pure BiVO4 sample.
황보연,우관주,손수현,박성수 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Vanadium dioxide(VO<sub>2</sub>) powder was synthesized from vanadium oxide(V<sub>2</sub>O<sub>5</sub>) and oxalic acid dihydrate by the control of temperature, time, and surfactant through hydrothermal method. The crystal structure, and thermochromic property of sample were analyzed by the means of SEM, XRD, DSC, and PSA. With increasing the amount of surfactant, the phase transition temperature of VO<sub>2</sub> sample was decreased from about 70°C to 60°C due to the decrease of particle size. The morphology of sample was changed to star-like shape with the decrease of particle size by addition of surfactant.
용매 열처리법을 통한 diketopyrrolopyrroles 화합물의 안료화 및 그 특성
김재환 ( Jae Hwan Kim ),양석원 ( Seok Won Yang ),김대성 ( Dae Sung Kim ),우관주 ( Guan Zhu Wu ),이근대 ( Gun Dae Lee ),박성수 ( Seong Soo Park ) 한국공업화학회 2014 공업화학 Vol.25 No.4
To prepare diketopyrrolopyrrole (DPP) red 254 pigment with high shield and bright color, DPP red 254 crude previously synthesizedwas treated at various thermal-treat temperature, addition derivative and ball-milling. The properties of samples weremeasured by the means of FT-IR, UV-Vis spectroscopy, TEM, PSA, BET surface area analyzer, viscometer andspectrophotometer. It was found that solvent thermal-treatment of the sample prepared after ball-milling as nano-scale was veryeffective method in pigmentation process.