The rheological and electrical properties of polyvinyl alcohol (PVA)/silver nanowire (AgNW) suspensions and films are investigated with increasing AgNW concentrations, employing AgNWs with two different aspect ratios, namely 714 and 1000 (referred to as Ag714 and Ag1000, respectively). To estimate the effect of the aspect ratio on the rheological and electrical percolation behavior, the linear rheological properties of suspensions and the electrical properties of the resulting films are systematically assessed. The microstructure of the suspensions and the surface morphology of the films are visualized using optical microscope (OM) and field emission scanning electron microscope (FE-SEM), respectively. Observations from OM analyses reveal that suspensions containing higher aspect ratio AgNW (Ag1000) exhibit larger flocculated clusters, resulting from the entanglement of the nanowires. As results, PVA/Ag1000 suspensions show higher linear viscoelasticity (as indicated by G′ and G″) when compared to PVA/Ag714 suspensions. However, unlike linear viscoelasticity, the electrical conductivities of PVA/Ag1000 films are lower than those of PVA/Ag714 films. This observation is attributed to the alignment of AgNWs during coating process providing substantial deformation and rapid alignment. Furthermore, SEM images of the films confirm the importance of retaining the flocculated clusters to achieve the desired electrical properties.

研究了聚乙烯醇 (PVA)/银纳米线 (AgNW) 悬浮液和薄膜的流变学和电学特性，并采用两种不同纵横比的 AgNW，即 714 和 1000（分别称为 Ag714 和 Ag1000），以增加 AgNW 浓度。为了估计长宽比对流变和电渗流行为的影响，系统地评估了悬浮液的线性流变特性和所得薄膜的电特性。分别使用光学显微镜（OM）和场发射扫描电子显微镜（FE-SEM）观察悬浮液的微观结构和薄膜的表面形态。OM 分析观察结果表明，含有较高长径比 AgNW (Ag1000) 的悬浮液表现出较大的絮凝簇，由纳米线的纠缠产生。结果，PVA/Ag1000 悬浮液表现出更高的线性粘弹性（如G'和G'' ) 与 PVA/Ag714 悬浮液相比。然而，与线性粘弹性不同，PVA/Ag1000 薄膜的电导率低于 PVA/Ag714 薄膜。这一观察结果归因于涂层过程中银纳米线的排列提供了显着的变形和快速排列。此外，薄膜的 SEM 图像证实了保留絮凝团簇以实现所需电性能的重要性。