표제지
초록
목차
기호설명 10
서론 12
1. 연구의 배경 12
2. 연구의 목표 14
본론 15
1. 연구 방법 15
1.1. 투명 DoD 잉크젯 시스템 15
1.2. 나노입자 현탁액 잉크 25
2. 외부 토출 가시화 실험 27
2.1. 실험 절차 27
2.2. 잉크 조성에 따른 불안정 액적 토출 결과 29
3. 내부 유동 가시화 실험 33
3.1. 순수 용액을 활용한 위성 액적 토출 실험적 분석 33
3.2. 나노입자 현탁액을 활용한 불안정 토출 실험적 분석 42
결론 57
참고 문헌 58
Abstract 61
Table 3.1. Experiment result independent of gravity effect on nanoparticle coagulation (after 5 min) 43
Table 3.2. Images of nanoparticle coagulation with respect to operation temperature (EG 50 vol% in DI water, TiO₂ 3 wt% (d99.9%〈150 nm))[이미지참조] 45
Table 3.3. Images of nanoparticle coagulation with respect to nozzle converging angle (DI water, TiO₂ 3 wt% (d99.9%〈150 nm))[이미지참조] 48
Table 3.4. Experiment results of macro flow effect on nanoparticle coagulation (after 5 min) 53
Table 3.5. Optimized operation condition and nozzle geometry (25° w/o macro flow, 75° w/o macro flow, 75° w/ macro flow) 56
Figure 1.1. Transparent inkjet system channel (a) without macro flow and (b) with macro flow 16
Figure 1.2. (a) Transparent DoD system and (b) transparent DoD system channel schematic for design analysis 21
Figure 1.3. (a) Transparent DoD system and (b) DI water droplet ejection results with respect to mm scale channel deflection (image at 0.0002 sec (left) and 0.00005... 24
Figure 1.4. Nanoparticle-suspension ink property: (a) surface tension, (b) viscosity and (c) Z-number 26
Figure 2.1. Experiment of droplet generation visualization 28
Figure 2.2. Regimes of droplet generation: (a) stable droplet, (b) satellite droplet, (c) jumping state and (d) crooked state 28
Figure 2.3. Effect of (a) EG solution and (b) nanoparticle-suspension with TiO₂ 3 wt%, (c) TiO₂ 10 wt% on unstable droplet generation 30
Figure 2.4. Effect of ink composition on (a) unstable droplet generation visualization results (1 Hz, 120 V) and (b) droplet velocity 32
Figure 3.1. Effect of (a) operation voltage and (b) ink composition on satellite droplet 35
Figure 3.2. Effect of operation voltage on satellite droplet: comparison between empirical and numerical results of (a) droplet velocity with respect to operation volt-... 39
Figure 3.3. (a) Effect of operation condition (V/V0) and ink composition (Oh) on satellite droplet and (b) visualization of satellite droplet and stable droplet[이미지참조] 41
Figure 3.4. Experimental set-up for comparison between (a) gravity effect and (b) evaporation effect on nanoparticle coagulation 43
Figure 3.5. Analysis of the amount of nanoparticle coagulation and the coagulation rate (EG 50 vol% in DI water, TiO₂ 3 wt% (d99.9%〈150 nm))[이미지참조] 45
Figure 3.6. Effect of operation temperature and ink composition on nanoparticle coagulation and the rate 45
Figure 3.7. Nozzle converging angle 48
Figure 3.8. Effect of nozzle converging angle on nanoparticle coagulation, the rate (0~40 min) and (b) the other rate (0~10 min, 10~40 min) 49
Figure 3.9. (a) Internal flow visualization at 1 min 30 sec after evaporation (left) and average PIV image for 1 min evaporation (right), (b) particle dynamics of Bas-... 50
Figure 3.10. Experimental set-up for macro flow effect on nanoparticle coagulation 53
Figure 3.11. Effect of operation temperature and macro flow on coagulation and coagulation rate 54
Figure 3.12. Vorticity driven by continuity between channel above the nozzle and macro flow at chamber 54