SiO2가 코팅 된 mica/Fe2O3 안료의 색상효과

다국어 초록 (Multilingual Abstract)

Recently pearl pigment is world widely used and its market expands remarkably because of the possible application in the area of cosmetics, photo-catalyst, electromagnetic shield and forgery prevention for valuable papers. So far a number of research projects have been carried out to find out the new possible candidates of metal and metal oxide showing th excellent optical properties.
The overall objective of this thesis is to find the optimum fabrication condition to obtain pearl pigment, which has excellent optical properties with broad wavelength using high and low refractive materials. Fe2O3 and SiO2 were selected as high and low refractive materials, respectively and these materials were coated on mica substrate with adjusting the various processing parameters, such as solution concentration, pH level, heat treatment temperature and time. In order to expect the experimental results, the simulation program, the Essential Macleod Program (EMP) was adopted in advance and compared with the experimental data.
Initially Fe2O3 were coated on mica using a wet process under pH 2 at 80℃ and systematically characterized. Following after that, SiO2 was coated on Fe2O3 on mica with same condition and heat treated with different temperature and time respectively. And then SiO2 coated on Fe2O3 were analyzed by many different characterization methods, such as, FE-SEM, EDS, XRD, FT-IR and spectrophometer. Based on EMP simulation data, there was no typical tendency in L*a*b* values even increasing the thickness of SiO2 on mica/Fe2O3,however. However, we can predicted that the colour of SiO2 coated on mica/Fe2O3 was the red-yellow. From our experiment, it can be confirmed that the optimized pH level to fabricate the SiO2 on mica/Fe2O3 was 2 and the perfect coated layer without any adhesion problem, can be obtained after addition of 20 ml SiO2 sol at 80 ℃ and more than 4 hr's mixing. The normal thickness of SiO2 was 100 ∼ 320 nm. As compared with the colour by spectrophotometer, the a* and b* values gradually increased, whereas L* value is relatively decreased with lower pH level and higher heat treatment temperature. The highest a* and b* values in pearl of mica/Fe2O3/SiO2 processed at pH 2 were 12.71 and 36.60, respectively. After heat treatment at 800 ℃, the a* and b* values increased up to 26.48 and 25.05, respectively.

목차 (Table of Contents)

• Ⅰ. 서 론 1
• Ⅱ. 이론적 배경 4
• 1. 진주안료 4
• 2. 색상 표현 9
• 2.1 RGB 가산혼합 10
• 2.2 CMYK 감산혼합 10
• 3. 기초 광학 이론 및 관계식 12
• 3.1 굴절 12
• 3.2 굴절률 13
• 3.2.1 굴절률 13
• 3.2.2 스넬의 법칙 15
• 3.3 소멸계수 17
• 4. CIE L*a*b* 표색계 17
• 5. EMP 시뮬레이션 20
• Ⅲ. 실험 22
• 1. 실험 재료 및 장치 22
• 2. Mica/Fe2O3 합성 방법 22
• 3. Mica/Fe2O3/SiO2 합성 방법 23
• 4. 특성 분석 및 측정 27
• Ⅳ. 결과 및 고찰 28
• 1. EMP 시뮬레이션을 통한 막 설계 28
• 1.1 고굴절 물질인 Fe2O3의 두께 변화가 색 구현에 미치는 영향 28
• 1.2 저굴절 물질인 SiO2의 두께 변화가 색 구현에 미치는 영향 31
• 2. Mica/Fe2O3 안료의 특성 분석 34
• 2.1 Mica/Fe2O3 안료의 미세구조 분석 34
• 2.2 Mica/Fe2O3 안료의 정성 분석 39
• 2.3 광도계를 이용한 색상 비교 42
• 3. Mica/Fe2O3/SiO2 안료의 특성 분석 45
• 3.1 Mica/Fe2O3/SiO2 안료의 미세구조 분석 45
• 3.2 Mica/Fe2O3/SiO2 안료의 정성 분석 50
• 3.3 광도계를 이용한 색상 비교 53
• 3.3.1 pH에 따른 mica/Fe2O3/SiO2 안료의 L*a*b* 색차계 측정 53
• 3.3.2 코팅 시간에 따른 mica/Fe2O3/SiO2 분말의 L*a*b* 색차계 측정 56
• 4. Mica/Fe2O3/SiO2 분말의 결정성 분석 59
• 5. Mica/Fe2O3/SiO2 분말의 구조 분석 61
• Ⅴ. 연구 결론 63
• 참고문헌 67
• 감사의글 71