Chirality-Preserving Growth of Helical Filaments in the B4 Phase of Bent-Core Liquid Crystals
Chirality-Preserving Growth of Helical Filaments in the B4 Phase of Bent-Core Liquid Crystals
复制标题
弯核液晶 B4 相中螺旋丝的手性保持生长
DOI：
10.1021/ja203522x
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发表时间：
2011-08-17
影响因子：
15
通讯作者：
Clark, Noel A.
中科院分区：
文献类型：
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作者：
Chen, Dong;Maclennan, Joseph E.;Clark, Noel A.
在B4液晶相的螺旋纤维的生长进行了研究的混合物中的cn-core和棒状介晶NOBOW和8 CB。凝固点降低导致NOBOW B4相直接从混合物中的各向同性相成核，形成在显微镜下容易观察到的大的左手和右手手性域。我们发现，这些域是由形成的成核和生长过程中，从任意手性的核，并继续与手性保持增长的长丝的同手性螺旋长丝。提出了一个分支丝相干的模型。该模型将有助于在相位和控制其生长和形态的应用，如介质。解释了所观察到的局部同手性和相位，提供了对B4的性质的更好理解，使用螺旋纳米相作为纳米异质
The growth of helical filaments in the B4 liquid-crystal phase was investigated in mixtures of the bent-core and calamitic mesogens NOBOW and 8CB. Freezing-point depression led to nucleation of the NOBOW B4 phase directly from the isotropic phase in the mixtures, forming large left- and right-handed chiral domains that were easily observed in the microscope. We show that these domains are composed of homochiral helical filaments formed in a nucleation and growth process that starts from a nucleus of arbitrary chirality and continues with chirality-preserving growth of the filaments. A model that coherence of the branched filaments is proposed. This model will help in phase and controlling its growth and morphology for applications, such as medium. accounts for the observed local homochirality and phase providing a better understanding of the nature of the B4 the use of the helical nanophase as a nanoheterogeneous