本論文旨在探討在一個外加直流階梯型電壓下,反水平配向之高分子穩定型向列液晶樣品的暫態電流行為。本論文主要研究液晶材料、碳奈管和高分子材料三者間的相互作用及影響,並藉由暫態電流的量測以瞭解液晶盒內部的離子分佈情形及傳輸行為;除此之外,吾人亦利用數學軟體Mathcad 2001 Professional和液晶模擬軟體DIMOS 2.0來比照實驗的結果。 實驗結果顯示,微量碳奈管的掺入能有效抑制離子效應的發生,此結果與本研究團隊多年來在液晶電光效應實驗中所得的結論相符。另外由實驗結果亦可得知:高分子網絡的大小不但會影響到液晶分子的轉動行為,也同時會對碳奈管吸附離子電荷的功效造成影響。
The study is concerned with transient current induced by the switching of an applied dc voltage in a polymer-stabilized liquid-crystal cell. It was directed toward understanding the interactions between liquid crystals, carbon nanotubes, and polymers. By the measurement of transient current, information about the transport behavior and distribution of the ion impurities in the cell was obtained. We also used both Mathcad and DIMOS 2.0 to simulate some experimental results. Experimental results indicate that the carbon nanotubes would suppress the field-screening effect, and that it is similar to our previous study of the electro-optical properties of liquid-crystal cells impregnated with carbon nanotubes. The domain sizes determined by the polymer network would restrict not only the reorientation of the liquid-crystal director but also the above-mentioned function of the carbon nanotubes in the cell.