자외선 차단용 나노 금속 산화물의 합성, 표면처리 및 분산거동에 관한 연구
- Abstract
- Nowaday, amount of ultraviolet rays reaching the face of the earth increases as the destruction of ozone layer of the stratosphere by the freon gas is progressed. So many people are interested in protecting skin and saving energy through the cutting off ultraviolet rays. Due to these requirements, it is widely used shielding ultraviolet rays by absorption and scattering with metal oxide.
In this study, their properties of dispersion and photo characteristic were compared firstly after the synthesis of metal oxides such as CeO, Fe2O3, ZnO and TiO2. Consequently, zinc oxide showed the characteristic of being more superior to other oxides.
The zinc oxide was synthesized into the sol gel method, and then sintered at relatively lower temperature of from 500 to 900 ℃ in order to reduce particle size. The sintered zinc oxide was surface-modified using silane coupling agent such as vinyltrimethoxy silane (VTMS), vinyltriethoxy silane (VTES), trimethoxymethyl silane (TMMS), 3-chlorotrimethoxy silane (3-chloro TMS), and 3-aminotrimethoxy silane (3-amino TMS). Also, the dispersibility of surface-modified zinc oxide was investigated with addition of surfactant under various solvent system of controlling the degree of hydrophilicity / hydrophobicity during ball-milling.
- Issued Date
- 2013
- Awarded Date
- 2013. 2
- Type
- Dissertation
- Publisher
- 부경대학교
- Affiliation
- 부경대학교 대학원
- Department
- 대학원 공업화학과
- Advisor
- 박성수
- Table Of Contents
- 제 1 장. 서론..............................................................................................................1
제 2 장. 이론적 배경...............................................................................................3
2.1. 광학적 거동........................................................................................................3
2.1.1. 유기계 자외선 차단제.................................................................................6
2.1.2. 무기계 자외선 차단제.................................................................................6
2.2. 무기 금속 산화물..............................................................................................8
2.2.1. Cerium Oxide...............................................................................................8
2.2.2. Iron Oxide.....................................................................................................9
2.2.3. Titanium Oxide..........................................................................................10
2.2.4. Zinc Oxide...................................................................................................12
2.3. 표면 개질..........................................................................................................15
2.3.1. 안료 표면개질.............................................................................................15
2.3.2. 표면 개질법.................................................................................................16
2.3.2.1. 습식 가열법..........................................................................................16
2.3.2.2. 습식 여과법..........................................................................................16
2.3.3.3. 건식 교반법..........................................................................................16
2.3.3.4. 인테그랄블랜드법................................................................................17
2.3.3.5. 조입법....................................................................................................18
2.4. 커플링제............................................................................................................19
2.4.1. 실란계...........................................................................................................19
2.4.2. 티타네이트계...............................................................................................20
2.4.3. 알루미늄계...................................................................................................20
2.4.4. 그 외.............................................................................................................20
2.5. 분산.......................................................................................................................21
2.5.1. 기계적 분산...................................................................................................22
2.5.2. 화학적 분산...................................................................................................24
2.5.3. 분산제 종류...................................................................................................29
2.5.4. 표면성질과 분산성......................................................................................30
2.5.5. 표면의 젖음성...............................................................................................31
2.5.6. 표면의 극성...................................................................................................32
2.5.7. 접촉각.............................................................................................................32
제 3 장. 실험................................................................................................................................34
3.1. 금속 산화물의 선정........................................................................................................34
3.1.1 용매 종류에 따른 분산.............................................................................................35
3.2. ZnO 합성..............................................................................................................................37
3.2.1. ZnCl2, CTAB을 이용한 합성.............................................................................39
3.2.2. ZnCl2, TEA를 이용한 합성.................................................................................40
3.2.3. Zinc acetate, EG를 이용한 합성.......................................................................41
3.3. ZnO의 표면 개질.............................................................................................................42
3.4. 개질된 ZnO 분말의 분산............................................................................................45
3.4.1. 용매 효과................................................................................................................45
3.4.2. 분산제 효과..................................................................................................................46
3.4.2.1. 분산제 구조 효과................................................................................................46
3.4.2.2. pH 효과......................................................................................................................48
3.4.2.3. 말단기 효과..............................................................................................................49
3.5. 특성 분석................................................................................................................................50
제 4 장. 결과 및 고찰............................................................................................................52
4.1. 금속 산화물의 분산 특성...............................................................................52
4.1.1. 분광학적 특성.............................................................................................52
4.1.2. Morphology 특성.......................................................................................54
4.2. 다양한 ZnO 분말의 합성..............................................................................56
4.3. ZnO의 표면 개질............................................................................................60
4.3.1. 개질된 입자의 표면 특성.........................................................................60
4.3.2. 표면 개질된 입자의 접촉각 특성..........................................................65
4.3.3. 표면 개질된 입자의 침강 특성..............................................................68
4.4. 표면 개질된 분말의 분산..............................................................................70
4.4.1. 용매 효과에 의한 광학적 특성 비교....................................................70
4.4.2. 분산제 효과에 의한 분산 특성..............................................................72
4.4.2.1 분광학적 특성.........................................................................................72
4.4.2.2 Morphology 특성...................................................................................74
4.4.2.3 입자 분포 특성.......................................................................................76
제 5 장. 결론............................................................................................................78
참고문헌.......................................................................................................................80
- Degree
- Master
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