| Summary: | 碩士 === 國立臺灣科技大學 === 醫學工程研究所 === 98 === Aluminum, Galvalumed steel, TiZn-P, SUS304, SUS304CF, PVDF, glass, and Si wafer are chosen in this work for the study of hydrophobic coating to metallic/non-metallic substrates. Various amount of TS-720 hydrophobic nano-particles were mixed into ITRI hydrophobic agent, and this liquid mixture is applied onto different material surfaces by a coating bar. High CA near 140o are achieved in all samples with 2.5 wt% TS-720 in ITRI H.A. mixture, and SEM images show that nano-porous surface composed of TS-720 nano-particle covers the surface of substrates. Profiles of AFM images also reveal the surface fluctuation caused by TS-720 nano-particle. From the previous study, we know that keys to super-hydrophobic surface are not only the high hydrophobic property of material but also the surface structure and roughness. No significant change in visual appearance and hydrophobicity are noticed after 450 hour exposure of UV weathering test for those coated samples.
When the content of TS-720 nano-particle in ITRI H.A. is higher than 5.0 wt%, the hydrophobic coating peels off obviously and brings degradation of hydrophobicity. This phenomena may cause by poor adhesion from the surface pretreatment of the substrate. PVDF paint with 10 wt% TS-720 nano-particle also shows higher hydrophobicity than ordinary one, however, same de-attachment from hydrophobic film also found from sample coated with 20 or 30 wt% TS-720 in ITRI solution.
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