Title Page
Contents
1. Introduction 9
1.1. Research background 9
1.2. Existing research 10
1.3. Research plan 11
2. Materials and Experiment 12
2.1. Materials 12
2.2. Preparation of SiO₂ sol 13
2.3. Preparation of TiO₂ sol 13
2.4. Preparation of superhydrophobic meshes (dip coating) 13
2.5. Preparation of superhydrophilic surfaces (spray coating) 14
2.6. Morphological research 14
2.7. Experimental setup for fog harvesting 14
3. Results and Discussion 14
3.1. Mimicking a cactus-stem catchment system 14
3.2. Water-catchment analysis 15
3.2.1. Effect of TiO₂ spraying distances 16
3.2.2. Effect of different meshes 20
3.3. Sample expansion experiments 20
4. Conclusion 22
References 23
Abstract 27
국문요약 29
Table 1. Detailed information of polyethylene terephthalate 12
Fig. 1. Preparation process of hydrophilic and hydrophobic double-layer structure sample and water-collection and drainage phenomenon. (a) Based on... 11
Fig. 2. Sample processing 12
Fig. 3. Taking mesh80 as an example, the field-emission scanning electron microscopy (FE-SEM) image of (a) untreated bare P (polyethylene... 15
Fig. 4. Field-emission scanning electron microscopy (FE-SEM) image of (a) mesh50 TOSP-5, (b) mesh50 TOSP-7, (c) mesh50 TOSP-9, (d) mesh50... 17
Fig. 5. Field-emission scanning electron microscopy (FE-SEM) image of (a) mesh80 TOSP-5, (b) mesh80 TOSP-7, (c) mesh80 TOSP-9, (d)... 18
Fig. 6. Field-emission scanning electron microscopy (FE-SEM) image of (a) mesh120 TOSP-5, (b) mesh120 TOSP-7, (c) mesh120 TOSP-9, (d) mesh120... 19
Fig. 7. Line graph of mesh50 TOSP-7 water collection versus time.(a) In the three pore sizes, the time required for the first drop of water to... 20
Fig. 8. Self-made device for testing the water-collection capacity of the sample and the results of the three tests. (a) The water-collection test was... 21