| 초록 |
The 4-cyano-4´-pentylbiphenyl (5CB) droplets were coated with surfactant sodium dodecyl sulphate (SDS, 5CBSDS) and dodecyltrimethylammonium bromide (DTAB, 5CBDTAB) separately, using microfluidics technique. The 5CBSDS and 5CBDTAB droplets exhibit a radial configuration under crossed polarizers observed through a polarized optical microscope. The 5CBSDS and 5CBDTAB was then exposed to the aqueous solutions of strong polyelectrolytes (PEs), a cationic quarternized poly-4-vinylpyridine (QP4VP) and an anionic polystyrenesulfonate (PSS). The radial configuration of the 5CBSDS was changed to bipolar in QP4VP while maintained in PSS solution. A similar radial-to-bipolar (R-B) change was observed for 5CBDTAB in PSS while no change in QP4VP solution. Furthermore, the R-B change in QP4VP and PSS was found to be defendant on the concentration of PEs solutions such as, the 5CBSDS droplets exhibit radial configuration in both low (≤ 10-6 wt%) and high (≥ 0.1 wt%) concentration of QP4VP solution. This PEs charged dependent R-B change of the 5CB droplets may open a new and simple approach in the developing of liquid crystal-based biosensors. |
