Nanoconfined heliconical structure of twist-bend nematic liquid crystal phase

Nanoconfined heliconical structure of twist-bend nematic liquid crystal phase
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扭转弯曲向列液晶相的纳米限制螺旋结构

DOI:
10.1080/02678292.2018.1508770
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发表时间:
2018
期刊:
影响因子:
2.2
通讯作者:
Clark, Noel A.
Clark, Noel A.
中科院分区:
化学3区
文献类型:
--
作者:
You, Ra;Park, Wongi;Carlson, Eric;Ryu, Seong Ho;Shin, Min Jeong;Guzman, Edward;Ahn, Hyungju;Shin, Tae Joo;Walba, David M.;Clark, Noel A.

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我们在多孔阳极氧化铝(AAO)薄膜中制备了纳米约束下扭弯向列相(NTB)液晶(LC)相的可控螺旋结构。利用不同的自组装单层膜(SAMs)来改变多孔AAO膜内表面的表面能,可以调节nb2相的锥度角和螺旋节距等结构参数。当LC分子放置在表面能相对较低的三十氟-1,1,2,2-四氢辛烷基-三氯硅烷(FOTS)处理过的底物上时,LC分子倾向于更自由地排列,从而形成更大的锥形角。相比之下,当放置在具有更高表面能的2-(甲氧基(聚乙烯氧基)-丙基)三甲氧基硅烷(PEG 6/9)处理过的底物上时,分子形成更紧密的排列结构,因此圆锥角更小。这项工作提高了我们对ntb期自组装螺旋结构的集体理解。
We produced controlled heliconical structures of a twist-bend nematic (NTB) liquid-crystal (LC) phase in nanoconfinement in a porous anodic aluminium oxide (AAO) film. The structural parameters of the NTBphase such as conical angle and helical pitch can be modulated by varying the surface energy of the inner surface of the porous AAO film, done by using different self-assembled monolayers (SAMs). The LC molecules tend to be more freely packed, thus forming a larger conical angle, when placed on the tri-deca-fluoro-1,1,2,2-tetrahydrooctyl-trichlorosilane (FOTS)-treated substrate, which has a relatively low surface energy. In contrast, the molecules form a more tightly packed structure, and thus a smaller conical angle, when placed on the 2-(methoxy(polyethyleneoxy)-propyl)trimethoxysilane (PEG 6/9)-treated substrate, which has higher surface energy. This work improves our collective understanding of self-assembled heliconical structures in the NTBphase.
介晶二聚体中自变形 Ntb 相的特性
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