Characteristics of silica nanoparticle and azo dye-doped liquid crystals and its applications
| Autor: | Chen-Yu Dai, 戴辰宇 |
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| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 In this study, we researched the electro-optical characteristics of silica nanoparticle and azo dye-doped liquid crystals (LCs) with hybrid aligned structure. The experimental process was as follows. Firstly, an external DC pulse-voltage was applied to the sample to control silica nanoparticles to accumulate on the substrate surface. Then, a diode-pumped solid-state (DPSS) green laser was adopted to irradiate the rubbing side of the LC cell and to induce the adsorption of azo dye molecules on the surface of the illuminated substrate. The results showed that the stability of the memory state of the sample decreased when LC molecules were hybridly aligned due to the accumulation of silica nanoparticles on the vertical aligned substrate side during the illumination duration. It was considered that the adsorption of azo dye molecules changed the surface energy of the substrate, and reduced the stability of the memory state. This characteristic was applied to fabricate a single cell-gap transflective LC display. When silica nanoparticles were accumulated on the homogeneously aligned substrate side during the illumination duration, the memory state of the sample was frozen. The reason was that azo dye molecules adsorb on the aggregated silica nanoparticles, and suppressed the electrophoretic effect. Therefore, the LC molecules remained to orient vertically. This result was also applied to fabricate a dual mode (dynamic and multi-stabe) phase grating. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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