The Buckling Spectra of Nanoparticle Surfactant Assemblies
The Buckling Spectra of Nanoparticle Surfactant Assemblies
复制标题
DOI：
10.1021/acs.nanolett.1c01454
复制
发表时间：
2021-08-27
期刊：
影响因子：
10.8
通讯作者：
Russell, Thomas P.
中科院分区：
文献类型：
--
作者：
Forth, Joe;Mariano, Andres;Russell, Thomas P.
对薄板机械性能的精细控制是跨细胞作用、细胞形状和形态发生的基础。将这些原理应用于基于液体的人工系统，已经导致了用于软机器人、驱动和化学合成的可重构材料。然而，由于缺乏在可与自然界中看到的类似范围内表现出可调机械性能的合成二维膜，进展受到限制。在这里，我们表明，通过改变组成纳米表面活性剂(NPSS)的配体和颗粒，可以在亚KBT到10(6)KBT的范围内连续改变纳米颗粒表面活性剂(NPSS)在油-水界面的弯曲模数B。我们发现了与连续介质行为的广泛背离，包括巨大的力学各向异性和B与屈曲谱宽度之间的幂函数关系。我们的发现为改变形状的液体器件提供了一个平台，并为描述薄膜起皱提供了新的理论。
Fine control over the mechanical properties of thin sheets underpins transcytosis, cell shape, and morphogenesis. Applying these principles to artificial, liquid-based systems has led to reconfigurable materials for soft robotics, actuation, and chemical synthesis. However, progress is limited by a lack of synthetic two-dimensional membranes that exhibit tunable mechanical properties over a comparable range to that seen in nature. Here, we show that the bending modulus, B, of thin assemblies of nanoparticle surfactants (NPSs) at the oil-water interface can be varied continuously from sub-kBT to 10(6) kBT, by varying the ligands and particles that comprise the NPS. We find extensive departure from continuum behavior, including enormous mechanical anisotropy and a power law relation between B and the buckling spectrum width. Our findings provide a platform for shape-changing liquid devices and motivate new theories for the description of thin-film wrinkling.