표제지
목차
국문초록 10
I. 서론 12
1. 연구 배경 및 TiO₂ 나노입자의 문제점 12
2. 기존 나노입자 분산안정도 개선방법 13
3. 침강안정도 14
4. UV screening effect 15
5. p-AAEMA 코팅 박막 합성 및 한계 15
6. Polyacrylate copolymer 코팅 박막 합성 17
II. 실험 재료 및 방법 19
1. Materials 19
2. Synthesis of the coating layer 20
3. Optimization of the reaction process conditions. 21
4. Terephthalic aicd assay 21
5. Radical scavenging activity 21
6. Dispersion viscosity 22
7. Dispersion stability evaluation 22
8. Apparent sedimenatation stability (Sapp)[이미지참조] 22
9. Aggregation stability 23
10. Differential scanning calorimetry & Thermal degradation analysis 23
11. FT-IR analysis 23
12. Transmission electron microscopy 23
13. Diffuse reflectance 24
14. In vitro sun protection factor 24
15. Application of surface treated nanoparticle 24
III. 결과 및 고찰 25
1. Optimization of the reaction process conditions. 25
2. Characterization of p-AAEMA coated TiO₂ nanoparticles 28
2-1. Transmission electron microscopy 28
2-2. Thermal degradation analysis 29
3. Photocatalytic activity 30
3-1. Terephthalic aicd assay 30
3-2. Radical scavenging activity 32
4. Rheological study 32
4-1. Dispersion viscosity 32
4-2. Dispersion stability evaluation 35
5. Optical property 38
5-1. Diffuse reflectance 38
5-2. In vitro sun protection factor (SPF) 40
6. Synthesis of polyacrylate copolymer coating layer 42
7. Dispersion characteristics 42
7-1. Apparent sedimenatation stability (Sapp)[이미지참조] 42
7-2. Aggregation stability 45
8. Characterization 46
8-1. Transmission electron microscopy 46
8-2. Differential scanning calorimetry & Thermal degradation analysis 47
8-3. FT-IR analysis 49
9. Optical property analysis 51
9-1. Diffuse reflectance 51
9-2. In vitro sun protection factor 53
10. Application of surface treated nanoparticle 55
IV. 결론 58
V. 참고문헌 60
ABSTRACT 67
Table 1. The sample codes of surface-coated TiO₂ nanoparticles. 20
Table 2. The log P value of varied solvent. 27
Table 3. The glass transition temperatures(Tg) of pure polymers and copolymers. 48
Table 4. The estimated maximum weight loss of AAEMA-co-MMA/AAc TIO₂ nanoparticles. 49
Figure 1. TEM images of commericals products. (a) ST-485SA15 and (b) ST-410WB. 14
Figure 2. Schematic illustration of p-AAEMA coating synthesis. 17
Figure 3. (a) The color change of AAEMA-TiO₂ nanoparticles in toluene by coordination. (b) Comparison of AAEMA monomer miscibili... 27
Figure 4. TEM images of surface coated TiO₂ samples in various solvents (a) Toluene, (b) 100% Ethanol, (c) 100% Methanol, (d) EtO... 28
Figure 5. TEM images of p-AAEMA coated TiO₂ nanoparticles with varied feed ratios. (a) T1A1, (b) T1A2, (c) T1A3. 29
Figure 6. TGA thermogram of bare TiO₂ and p-AAEMA coated samples. 30
Figure 7. Hydroxy radical concentration of bare TiO₂ and p-AAEMA coated TiO₂ nanoparticles with varied feed ratios. 31
Figure 8. Radical scavenging efficiency of AAEMA monomer. 32
Figure 9. (a) Viscosity of bare TiO₂ and p-AAEMA coated nanoparticles dispersion in hydrocarbon (squalane) at various... 33
Figure 10. Bare TiO₂ and p-AAEMA coated TiO₂ dispersion with polyacrylate thickener (Carbopol 940). 35
Figure 11. Transmittance and back scattering profile differences of TiO₂ nanoparticles dispersions in (A) butylene glycol, (B) DC 200... 38
Figure 12. (a) Diffuse reflection of bare TiO₂ and p-AAEMA coated samples. (b) UV-Vis Absorption spectrum of AAEMA... 39
Figure 13. In vitro sun protection factors (SPF) of TiO₂ samples; in (a) liquid paraffin and (b) 1,3-butylene glycol. 41
Figure 14. Comparison of the sedimentation rate of coated titanium dioxide nanoparticles based on the AAEMA:MMA ratio (a) and... 44
Figure 15. The dispersion state of bare TiO₂ nanoparticles and surface-treated TiO₂ nanoparticles in a solvent. 45
Figure 16. TEM images of (a) bare TiO₂ nanoparticles. (b) p-AAEMA coated TiO₂ nanoparticles. copolymer coated TiO₂... 46
Figure 17. DSC curves of p-AAEMA coated TiO₂ nanoparticles and AAEMA-co-MMA/AAc coated TiO₂ nanoparticles. 47
Figure 18. TGA thermogram of bare TiO₂ nanoparticles and E3M7, E7A3 samples. 48
Figure 19. FT-IR spectrum of bare TiO₂, T1E1 sample and AAEMA-co-MMA coated samples with different compositions. 50
Figure 20. Diffuse reflection of bare TiO₂, T1E1 sample and (a) AAEMA-co-MMA coated samples. (b) AAEMA-co-AAc coated samples. 52
Figure 21. In vitro sun protection factors (SPF) of TiO₂ powder samples (a) in liquid paraffin (b) in 1,3 butylene glycol. 54
Figure 22. Diffuse reflection of copolymer coated TiO₂ nanoparticles combined with Mn or Zn. 56
Figure 23. In vitro sun protection factors (SPF) of copolymer coated TiO₂ nanoparticles combined with Mn or Zn. 57