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Controlling phase and rheological behaviours of hexagonal lyotropic liquid crystalline templates for nanostructural administration and retention
Journal of Colloid and Interface Science ( IF 9.9 ) Pub Date : 2021-09-06 , DOI: 10.1016/j.jcis.2021.09.019
Guang Wang 1 , Christopher J Garvey 2 , Senlin Gu 3 , Weimin Gao 4 , Luke A O'Dell 3 , Anwen M Krause-Heuer 5 , Tamim A Darwish 5 , Alexander Zhigunov 6 , Xin Tong 7 , Lingxue Kong 3
Affiliation  

Introducing polymerizable monomers into a binary hexagonal lyotropic liquid crystalline (LLC) template is a straightforward way for retaining the nanostructure but will decrease attractive intra- and inter- aggregate interactions. It is therefore crucial to understand the interfacial interactions at nanoscale after introducing the monomers but prior to polymerization. Herein, active species, poly (ethylene glycol) diacrylate (PEGDA) and 2-hydroxyethyl methacrylate (HEMA), were introduced into hexagonal LLC of dodecyl trimethylammonium bromide and water to explore the structural variables, dimensional stability, and dynamic property. At a proper volume ratio of PEGDA/HEMA (1/4), the system presents excellent homogeneity with a higher dimensional stability and lower dynamic property from rheological assessments, thereby achieving robust, free-standing, and transparent membranes after photo-polymerization. The unique property of the system also lies in the much lower order–disorder transition temperature (45 °C) that facilitates the reorientation of mesochannels. They are in contrast inaccessible for the ternary system only with PEGDA, though the nanostructure for both systems could be retained. An insight into subtle variations in these parameters allows us to prepare a polymerizable template possessing higher dimensional stability and suitable flexibility via molecular design, thereby enabling simultaneous structural alignment and retention for the development of functional nanomaterials.



中文翻译:

用于纳米结构给药和保留的六方溶致液晶模板的相和流变行为控制

将可聚合单体引入二元六边形溶致液晶 (LLC) 模板是保留纳米结构的直接方法,但会减少有吸引力的聚合内和聚合间相互作用。因此,在引入单体之后但在聚合之前了解纳米级的界面相互作用至关重要。在此,将活性物质聚(乙二醇)二丙烯酸酯 (PEGDA) 和甲基丙烯酸 2-羟乙酯 (HEMA) 引入十二烷基三甲基溴化铵和水的六方 LLC 中,以探索结构变量、尺寸稳定性和动态性能。在适当的 PEGDA/HEMA (1/4) 体积比下,该系统表现出优异的均质性,具有更高的尺寸稳定性和更低的流变评估动态特性,从而实现稳健、光聚合后的独立透明膜。该系统的独特性质还在于更低的有序-无序转变温度(45°C),这有助于介通道的重新定向。相比之下,仅使用 PEGDA 的三元系统无法访问它们,尽管可以保留两个系统的纳米结构。对这些参数的细微变化的洞察使我们能够通过分子设计制备具有更高尺寸稳定性和适当灵活性的可聚合模板,从而能够同时进行结构对齐和保留,以开发功能性纳米材料。该系统的独特性质还在于更低的有序-无序转变温度(45°C),这有助于介通道的重新定向。相比之下,仅使用 PEGDA 的三元系统无法访问它们,尽管可以保留两个系统的纳米结构。对这些参数的细微变化的洞察使我们能够通过分子设计制备具有更高尺寸稳定性和适当灵活性的可聚合模板,从而能够同时进行结构对齐和保留,以开发功能性纳米材料。该系统的独特性质还在于更低的有序-无序转变温度(45°C),这有助于介通道的重新定向。相比之下,仅使用 PEGDA 的三元系统无法访问它们,尽管可以保留两个系统的纳米结构。对这些参数的细微变化的洞察使我们能够通过分子设计制备具有更高尺寸稳定性和适当灵活性的可聚合模板,从而能够同时进行结构对齐和保留,以开发功能性纳米材料。

更新日期:2021-09-15
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