La(0.5)Ca(0.5)MnO3 분말과 Pellet의 구조분석 및 자기적 성질

정미원,이지윤,김현정 한국화학공학회 2005 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.43 No.1

Titanium(IV) isoproxide 유도체의 합성 및 특성연구

정미원,Jung, Mie-Won 한국분석과학회 1999 분석과학 Vol.12 No.6

Titanium(IV) isoproxide에 유기첨가제로 아세트산을 첨가하여 단일성분계인 치환된 titanium(IV) isoproxide를 합성한다. 합성된 titanium 착화합물은 세가지 형태로 된 5배위 및 6배위의 구조로 존재함을 FT-IR, $^1H$ 및 $^{13}C$ NMR 그리고 UV-Vis 스펙트라로 확인하였다. 이 착물에 대한 가수분해 반응을 $^1H$-NMR spectroscopy를 이용해 관찰하였고 FT-IR spectroscopy로 가수분해 및 건조시킨 후의 구조 변화를 관찰하여 보았으며 리간드의 존재 유무도 살펴보았다. The systematic modification of titanium(IV) isopropoxide with acetic acid as a organic additive was done and identifided by FT-IR, $^1H$, $^{13}C$ NMR and UV-Vis spectroscopy. The structure was cbanged after hydrolysis-condensation reaction and drying process. The hydrolysis-condensation rates of modified Ti alkoxide with acetic acid were investigated by $^1H$ NMR spectroscopy. This modified Ti(IV) alkoxide was less reactive toward hydrolysis-condensation reaction than $Ti(OPr^i)_4$, which can be attributed to the stable ligand structure between Ti alkoxide and ligand. The structural change on obtained from gel powders with heat treatment was also observed by FT-IR spectroscopy.

La이 도핑된 CuO-ZnO-Al₂O₃ 복합 산화물의 합성공정개발

정미원,임샛별,문보람,홍태환,Jung, Mie-Won,Lim, Saet-Byeol,Moon, Bo-Ram,Hong, Tae-Whan 한국재료학회 2011 한국재료학회지 Vol.21 No.1

La doped CuO-ZnO-$Al_2O_3$ powders are prepared by sol-gel method with aluminum isopropoxide and primary distilled water as precursor and solvent. In this synthesized process, the obtained metal oxides caused the precursor such as copper (II) nitrate hydrate and zinc (II) nitrate hexahydrate were added. To improve the surface areas of La doped CuO-ZnO-$Al_2O_3$ powder, sorbitan (z)-mono-9-octadecenoate (Span 80) was added. The synthesized powder was calcined at various temperatures. The dopant was found to affect the surface area and particle size of the mixed oxide, in conjunction with the calcined temperature. The structural analysis and textual properties of the synthesized powder were measured with an X-ray Diffractometer (XRD), a Field-Emission Scanning Electron Microscope (FE-SEM), Bruner-Emmett-Teller surface analysis (BET), Thermogravimetry-Differential Thermal analysis (TG/DTA), $^{27}Al$ solid state Nuclear Magnetic Resonance (NMR) and transform infrared microspectroscopy (FT-IR). An increase of surface area with Span 80 was observed on La doped CuO-ZnO-$Al_2O_3$ powders from $25m^2$/g to $41m^2$/g.

Quinacridone을 첨가시킨 SnO₂가 도핑된 TiO₂ 분말의 광촉매 특성

정미원,곽윤정,Jung, Miewon,Kwak, Yunjung 한국공업화학회 2007 공업화학 Vol.18 No.6

$SnO_2$가 도핑된 $TiO_2$ 분말을 tin (IV) bis(acetylacetonate) dichloride와 titanium diisopropoxide bis(acetylacetonate)를 출발물질로, 유기염료인 quinacridone을 첨가하여 합성하였다. 반응 전후 염료의 구조를 FT-IR로 관찰하였고, 입자의 모양과 형태 및 결정의 구조는 FE-SEM과 XRD 분석기로 알아보았다. 환경오염물질로 유기염료인 indigo carmine을 선택하여 관찰한결과, 아나타제 구조를 갖는 quinacridone이 첨가된 분말을 합성하여, 가시광선 영역에서 광분해 효과를 관찰할 수 있었다. $SnO_2$-doped $TiO_2$ powder was obtained from tin (IV) bis(acetylacetonate) dichloride and titanium diisopropoxide bis(acetylacetonate) with quinacridone as the dye sensitizer molecule. The structural changes of the reaction mixture were monitored by fourier transform infrared (FT-IR) spectroscopy. The morphology and microstructure of gel powder were studied by field-emission scanning electron microscopy (FE-SEM) and X-ray diffractometry (XRD). The photocatalytic activity of these powders with the anatase structure was investigated by using indigo carmine solution as a test dye

SnO₂가 도핑된 TiO₂ 박막의 합성 및 광촉매 효과

정미원,곽윤정,Jung, Mie-Won,Kwak, Yun-Jung 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.11

[ $SnO_2$ ]-doped $TiO_2$ thin films were prepared from tin (IV) bis (acetylacetonate) dichloride and titanium diisopropoxide bis (acetylacetonate) with pluronic P123 or degussa P25 as a structural-directing agent. These hydrolyzed sol were spin coated onto Si(100) wafer substrate. The microstructure, morphology and bonding states of thin films were studied by field-emission scanning electron microscopy (FE-SEM), X-ray diffractometry (XRD), and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of these films was investigated by using indigo carmine solution.

졸-겔공정에 의해 실리카 구조체에 도입된 유기 NLO 물질의 특성

정미원,문정호,설용건,( Mie Won Jung,Jeong Ho Mun,Yong Gun Shul,Tatsuo Wada ) 한국공업화학회 1993 공업화학 Vol.4 No.3

반응성과 성형성이 우수한 졸-겔법을 이용하여 비선형 광학물질인 MNA(2-Methyl-7-nitro-aniline), Carbazole 1(5-Nitro-9-hydroxyethyl Carbazole), Carbazole 2(5-Nitro-9-ethyl Carbazole) 그리고 DR1 (Disperse Red 1)을 Silica matrix에 조합시킨 유-무기계 복합박막을 제조하였다. 이들 유-무기계 복합박막의 열적 안정도와 분해정도를 비교한 결과 -OH기를 갖는 Carbazole 1과 DR 1이 열분해에 대한 안정성이 우수하다는 것을 알았다. Carbazole 1의 편극화 처리로 UV 흡광도의 현저한 감소가 일어났고 상온에서 전기장을 제거하자 UV 흡광도의 느린 회복이 발견되었다. Organic nonlinear optical materials such as MNA(2-Methyl-4-nitro-aniline), Carbazole 1 (5-Nitro-9-hydroxyethyl Carbazole), Carbazole 2 (5-Nitro-9-ethyl Carbazole) and DR 1(Disperse Red 1) were incorporated into silica matrix to form a composite thin films. The thermal stability and degree of degradation were compared to these organic-inorganic composite film. Among those films, Carbazole 1 and DR 1 which have terminal -OH group showed enhanced stability for thermal degradation. The effect of polarization and degree of relaxation for the composite thin films incorporated with Carbazole 1 were measured by the absorbance change of UV spectra with time. With polarization treatment of Carbazole 1 incorporated composite film, the intensity of UV absorbance was remarkably reduced. And slow relaxation of Carbazole 1 molecule was suggested from the slightly recovered intensity of UV absorbance after removing the electric field at room temperature.

시설보호아동의 서열개념 발달에 미치는 조기 개입 프로그램의 효과

정미원,한미현 대한아동복지학회 2003 아동복지연구 Vol.1 No.1

시설보호아동들은 전형적으로 부모부재로 입소하지만, 최근에는 부모의 이혼, 재혼, 가출 등의 부부불화나 빈곤으로 인한 양육포기로 입소하는 경우가 늘고 있다. 이처럼 정상가정에서 보호받을 수 없는 요보호 아동이 아동복지시설에서 집단보호를 받게 되는데, 이들에 관한 기존의 연구결과들을 보면, 시설보호아동들이 인지발달상의 지체는 물론 여러 발달 측면에서 부정적이고 심각한 문제를 보이는 것으로 보고되고 있다. 이에 본 연구에서는 인지발달의 기초적 능력을 구성하는 서열개념의 발달이 일반가정아동과 시설보호아동간에 차이가 있는 가를 살펴보고, 나아가 시설보호아동의 서열개념 이해 및 발달에 미치는 조기 개입 프로그램의 효과를 살펴보는 것을 목적으로 삼았다. 이를 위해 시설보호아동 32명과 일반가정의 아동 32명, 총 64명을 유의표집하여 실험집단과 통제집단으로 구분하였다. 실험설계는 현장교육연구에서 가장 널리 사용되는 ‘이질 통제 집단 사전-사후 검사설계’를 사용하였으며, 1:1 대응, 크기, 길이, 질감, 명암, 무게 등의 6개 차원으로 하위 서열과제를 분류하였다. 우선, 두 집단의 서열개념 발달수준을 비교하기 위해 실험처치에 앞서 사전검사를 실시하고 집단간 차이 검증을 위해 독립표본 t검증을 실시하였다. 그런 다음 시설보호아동에 대해 8주간의 개입프로그램을 실시하고 프로그램의 효과를 보기위해 실험집단을 대상으로 대응표본 t검증을 실시하였다. 그 결과, 1:1 대응, 크기, 무게 차원의 서열과제에서 시설보호아동이 일반아동보다 낮은 점수를 보였다. 한편, 8주간의 실험처치 후 사전-사후검사간 차이검증을 한 결과, 모든차원의 서열과제에서 유의미한 증가를 보였다. 이러한 결과는 시설보호아동을 위한 개입프로그램의 필요성을 시사하며, 따라서 이들을 위한 사회적 관심과 노력이 한층 더 모아지고 실천적 정책이 마련되어야 함을 보여준다. The purpose of this study was to compare the concept of seriation between the institutionalized children and the home-reared children, and to examine the effect of the compensatory education program for the institutionalized children on their concept of seriation. Sixty four 36 months to 48 months old children were sampled for this study. 32 children were selected from a nursery center, and 32 children were selected from two kindergartens in Incheon. According to nonequivalent control group pretest-posttest design, the institutionalized children were designated as the experimental group, and the home-reared children were for the control group. Before the intervention, both groups all were measured on their concept of seriation. Next, an intervention program was provided to the experimental group for an eight-week period. After the intervention, they were tested on their concept of seriation. The data were analyzed using the SPSS Win 10.0 program. Statistical techniques such as frequency, percentile, mean, standard deviation, paired t-test, and independent t-test were used. The results of this study were; First, the institutionalized children had lower scores on the concept of seriation than the home-reared children in the domains of 1:1 correspondence, size, and weight. Second, after the intervention, the children in the experimental group showed significantly higher scores on the concept of seriation in all domains than their scores of pretest. These results suggest that social concern and efforts for the well-being of the institutionalized children are needed. They also highlight the importance of early intervention program, services and public policies for them.

고분자 P123와 란탄이 도핑된 알루미나의 특성 연구

정미원,이미회,Jung, Mie-Won,Lee, Mi-Hoe 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.5

To direct the evolution of nanostructure and immobilize ${\gamma}-Al_2O_3$ catalyst, nanocrystalline La-doped-$Al_2O_3$ powder were prepared by the sol-gel process with addition of an amphiphilic block copolymer template (pluronic P123: $(poly(ethyleneoxide)_{20}-poly(propyleneoxide)_{70}-poly(ethyleneoxide)_{20})$. The dried gel is amorphous, whereas heating at temperature above $700^{\circ}C$ leads to the formation of nanocrystalline ${\gamma}$ and ${\delta}-Al_2O_3$ and these two phases is kept until $1100^{\circ}C$. ${\alpha}-A1_2O_3 $starts to form at $1200^{\circ}C$ with $LaAl_{11}O_{18}$. The surface morphology and crystal structure has been observed by field emission scanning electron microscope (FE-SEM) and X-ray diffraction (XRD). Solid state $^{27}Al$ MAS NMR indicates two types of local environment, i.e. octahedral and tetrahedral sites. The surface area and pore size was compared among these powders using the BET nitrogen adsorption measurements.

고분자 첨가법에 의해 SnO₂가 도핑된 TiO₂ 분말의 합성 및 광촉매 특성

정미원,곽윤정,Jung, Miewon,Kwak, Yunjung 한국공업화학회 2006 공업화학 Vol.17 No.5

$SnO_{2}$-doped anatase type $TiO_{2}$ powder was prepared by the polymerization complex route from tin(IV) bis (acetylacetonate) dichloride, titanium diisopropoxide bis (acetylacetonate) and polyethylene glycol (PEG) as a complexing agent. The structural changes of reaction mixture were monitored by fourier transform infarared (FT-IR) spectroscopy. The microstructure and morphology of gel powder were studied by field-emission scanning electron microscopy (FE-SEM) and X-ray diffractometry (XRD). The photocatalytic activity of these powders with the anatase structure was investigated by using indigo carmine solution. $SnO_{2}$가 도핑된 아나타제형의 $TiO_{2}$ 분말을 tin (IV) bis (acetylacetonate) dichloride와 titanium diisopropoxide bis (acetyl- acetonate)를 출발물질로, polyethylene glycol (PEG)을 첨가하여 합성하였다. 반응과정에 대한 구조변화를 FT-IR로 추적하였고, 입자의 모양과 형태 및 결정의 구조는 FE-SEM과 XRD 분석기로 관찰하였다. 합성된 분말의 광촉매 효과는 환경오염물질로 indigo carmine (IC)을 선택하여 UV-visible 스펙트라로 관찰하였다.

졸-겔법으로 합성한 La0.2Ca0.8MnO3의 분말과 펠렛의 특성

정미원,이지윤,김현정 한국공업화학회 2005 공업화학 Vol.16 No.1