Micellar Lyotropic Nematic Gels,Advanced Materials

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Micellar Lyotropic Nematic Gels
Advanced Materials ( IF 27.4 ) Pub Date : 2021-01-18 , DOI: 10.1002/adma.202007340
Sonja Dieterich ₁ , Friedrich Stemmler ₁ , Natalie Preisig ₁ , Frank Giesselmann ₁

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Lyotropic liquid crystal (LLC) gels are a new class of liquid crystal (LC) networks that combine the anisotropy of micellar LLCs with the mechanical stability of a gel. However, so far, only micellar LLC gels with lamellar and hexagonal structures have been obtained by the addition of gelators to LLCs. Here, the first examples of lyotropic nematic gels are presented. The key to obtain these nematic gels is the use of gelators that have a non‐amphiphilic molecular structure and thus leave the size and shape of the micellar aggregates essentially unchanged. By adding these gelators to lyotropic nematic phases, an easy and reproducible way to obtain large amounts of lyotropic nematic gels is established. These nematic gels preserve the long‐range orientational order and optical birefringence of a lyotropic nematic phase but have the mechanical stability of a gel. LLC nematic gels are promising new materials for elastic and anisotropic hydrogels to be applied as water‐based stimuli‐responsive actuators and sensors.

中文翻译：

胶束溶质向列型凝胶

溶致液晶（LLC）凝胶是一类新型的液晶（LC）网络，它将胶束LLC的各向异性与凝胶的机械稳定性结合在一起。但是，到目前为止，通过向LLCs中添加胶凝剂，仅获得了具有层状和六边形结构的胶束LLC凝胶。在这里，介绍了溶致向列凝胶的第一个例子。获得这些向列型凝胶的关键是使用具有非两亲分子结构的胶凝剂，从而使胶束聚集体的大小和形状基本保持不变。通过将这些胶凝剂添加到溶致向列相中，建立了获得大量溶致向列凝胶的简便且可重现的方法。这些向列型凝胶保留了溶致向列相的远距离取向顺序和光学双折射，但具有凝胶的机械稳定性。LLC向列型凝胶有望成为用于弹性和各向异性水凝胶的新型材料，用作水基刺激响应性执行器和传感器。

更新日期：2021-02-22

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