The Effect of the Liquid-Crystalline Order on Releasing Dye Molecules from Liquid-Crystalline Nano-Emulsions
The Effect of the Liquid-Crystalline Order on Releasing Dye Molecules from Liquid-Crystalline Nano-Emulsions
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DOI：
10.1080/15421406.2015.1025625
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发表时间：
2015-03-24
影响因子：
0.7
通讯作者：
Yamamoto, Jun
中科院分区：
文献类型：
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作者：
Bono, Shinji;Yokoyama, Masayuki;Yamamoto, Jun
我们制备了分散在水中的含染料液晶纳米乳液(LCNE)，并研究了将染料分子从LCNE核心释放到水中的可控性。我们从透射谱中估算了LCNE核心中的染料分子浓度。结果表明，在冷却时，染料分子从LCNE的核心释放出来，低于特征释放温度。此外，用去偏振静态光散射方法估算了LCNE核中低分子液晶的各向同性(I-N)相变温度。通过控制二元液晶混合物的混合比例，对其相变温度进行了调节。在整个混合比范围内，释放温度与LCNE芯区的I-N相变温度完全对应。因此，我们证实了LCNE核心中液晶有序的出现是LCNE释放染料分子的主要原因。
We fabricated dye-containing liquid-crystalline nano-emulsions (LCNEs) dispersed in water, and studied the controllability of releasingdye molecules from the coreof LCNEs into water. We estimated the concentration of the dye molecules held in the core of LCNEs from transmission spectrum. As a result, it was revealed that the dye molecules are released from the core of LCNEs below the characteristic release-temperature on cooling. Moreover, the depolarized static light scattering measurement was performed to estimate the Isotropic-Nematic(I-N) phase transition temperature of low molecular weight liquid crystals in the core of LCNEs. By controlling mixing ratio of binary liquid crystalline mixture, we tuned theI-N phase transition temperature. The release-temperature completely corresponds to the I-N phase transition temperature in the coreof LCNEswithin the whole mixing ratio. Thus, we confirmed that the emergence of the liquid-crystalline order in the core of LCNEs plays a principal role in releasing the dye molecules from LCNEs.