Rheological Properties and Structural Correlations in Molecular Organogels
Rheological Properties and Structural Correlations in Molecular Organogels
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DOI：
10.1021/la991545d
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发表时间：
2000-04
期刊：
影响因子：
3.9
通讯作者：
P. Terech;D. Pasquier;Á. Bordás;C. Rossat
中科院分区：
文献类型：
--
作者：
P. Terech;D. Pasquier;Á. Bordás;C. Rossat
研究了12-羟基硬脂酸(HSA)有机凝胶，以强调这类物理凝胶的流变性质与纳米结构之间的溶剂依赖关系。考虑了不同的长度尺度：宏观尺度的光学不透明度、流变学、相图数据；纳米尺度的小角中子散射实验；分子尺度的1H核磁共振数据。HSA网络是具有刚性结合区的刚性纤维网络，并且表现为弹塑性材料。剪切弹性、屈服应力和变形行为似乎通过纤维的横截面形状与网络的结晶度有关。分子聚集动力学和流动特性也被用来比较三种类型的人血清白蛋白凝胶(甲苯、十二烷、硝基苯)。在分子纳米材料的背景下，熔化转变以及屈服应力与浓度的依赖关系表现出显著的行为。
Organogels of 12-hydroxystearic acid (HSA) have been investigated to emphasize solvent-dependent relationships between rheological properties and nanostructures in this class of physical gels. Different length scales are considered: macroscopic with optical opacity, rheology, phase diagram data; nanoscopic with small-angle neutron scattering experiments and molecular with 1H NMR data. HSA networks are shown to be rigid fibrillar networks with rigid junction zones and behave as elastoplastic materials. Shear elasticities, yield stresses, and deformation behaviors appear connected to the crystallinity of networks through the cross-sectional shapes of fibers. Kinetics of molecular aggregation and flowing properties are also used to compare three classes of HSA gels (toluene, dodecane, nitrobenzene). The melting transitions as well as the concentration dependence of yield stresses exhibit remarkable behaviors analyzed in a context of molecular nanomaterials.