All twist and no bend makes raft edges splay: Spontaneous curvature of domain edges in colloidal membranes
All twist and no bend makes raft edges splay: Spontaneous curvature of domain edges in colloidal membranes
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DOI：
10.1126/sciadv.aba2331
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发表时间：
2019-08
期刊：
影响因子：
13.6
通讯作者：
Joia M. Miller;Douglas M Hall;Joanna Robaszewski;Prerna Sharma;M. Hagan;G. Grason;Z. Dogic
中科院分区：
文献类型：
--
作者：
Joia M. Miller;Douglas M Hall;Joanna Robaszewski;Prerna Sharma;M. Hagan;G. Grason;Z. Dogic
胶体膜纹理的几何挫折驱动自发边缘曲率和非凸形状的筏域。利用理论和实验研究了由不同长度的刚性杆组成的胶体膜中两个不混溶区域之间的界面。刚性杆包装的几何考虑意味着，足够短的杆在长杆的背景膜的域是更容易扭曲比相反的结构，在短杆膜的长杆域。在畴间边缘力张开，这反过来，表现为自发的边缘曲率与能量控制的长度不对称的组成杆的中平面倾斜。这种倾斜曲率耦合在interdomain边缘的热力学模型解释了一些实验观察，包括环形长杆域，和非单调依赖域半径的边缘扭曲。我们的工作表明，在二维流体中的取向和成分自由度之间的耦合如何产生复杂的形状的流体域，类似于在3D流体囊泡的形状转变。
Geometric frustration of colloidal membrane textures drives spontaneous edge curvature and nonconvex shapes of raft domains. Using theory and experiments, we study the interface between two immiscible domains in a colloidal membrane composed of rigid rods of different lengths. Geometric considerations of rigid rod packing imply that a domain of sufficiently short rods in a background membrane of long rods is more susceptible to twist than the inverse structure, a long-rod domain in a short-rod membrane. The midplane tilt at the interdomain edge forces splay, which, in turn, manifests as spontaneous edge curvature with energetics controlled by the length asymmetry of constituent rods. A thermodynamic model of such tilt-curvature coupling at interdomain edges explains a number of experimental observations, including annularly shaped long-rod domains, and a nonmonotonic dependence of edge twist on domain radius. Our work shows how coupling between orientational and compositional degrees of freedom in two-dimensional fluids gives rise to complex shapes of fluid domains, analogous to shape transitions in 3D fluid vesicles.