Real-time observation of fiber network formation in molecular organogel: supersaturation-dependent microstructure and its related rheological property.
Real-time observation of fiber network formation in molecular organogel: supersaturation-dependent microstructure and its related rheological property.
复制标题
DOI：
10.1021/jp054531r
复制
发表时间：
2006-04
期刊：
影响因子：
--
通讯作者：
Rongyao Wang;Xiang‐Yang Liu;J. Xiong;Jingliang Li
中科院分区：
文献类型：
--
作者：
Rongyao Wang;Xiang‐Yang Liu;J. Xiong;Jingliang Li
近年来，低分子量有机凝胶因子在有机溶剂中自组织形成三维纤维网络引起了人们的广泛关注。然而，到目前为止，纤维网络的微观结构是如何形成的凝胶化过程中和控制的凝胶网络的拓扑结构的关键因素仍然有待确定。在这项工作中，我们解决了这些问题，通过调查在原位形成的N-月桂酰-L-谷氨酸二正丁基酰胺（GP-1）/丙二醇（PG）系统的凝胶网络。通过光学显微镜，凝胶网络的微观结构的时间演变进行了研究，在各种过饱和条件下。研究发现，过饱和度是决定凝胶网络拓扑结构的关键因素之一。特别是，结的产生是依赖于过饱和度的。流变实验进一步揭示了拓扑结构与力学性能之间的相关性。这表明，可以通过调整凝胶网络的微观结构拓扑结构来有效地改善流变性能。我们的研究结果在这里提供了新的物理见解的分子凝胶的形成动力学。此外，这项工作可能是重要的，在构建和工程的超分子结构的应用。
Low-molecular mass organic gelators self-organizing into three-dimensional fiber networks within organic solvents have attracted much attention in recent years. However, to date, how the microstructure of fiber network is formed in a gelation process and the key factors that govern the topological structure of a gel network remain to be determined. In this work, we address these issues by investigating the in situ formation of the gel networks in the N-lauroyl-l-glutamic acid di-n-butylamide (GP-1)/propylene glycol (PG) system. By using optical microscopy, the time evolution of the gel network microstructure was investigated under various supersaturation conditions. It is found that supersaturation is one of the key factors that govern the topological structure of a gel network. In particular, the creation of the junctions turns out to be supersaturation-dependent. The rheological experiments further revealed the correlation between topological structure and mechanical properties. It suggests that the rheological properties can be effectively modified by tuning the microstructure topology of the gel network. Our results reported here provide new physical insight into the formation kinetics of a molecular gel. Furthermore, this work could be important in constructing and engineering a supramolecular structure for the purpose of applications.