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arXiv 1601.08232cond-mat.soft
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自组装胶体膜中手性筏的相互作用

Interaction of chiral rafts in self-assembled colloidal membranes

Sheng Xie, Robert A. Pelcovits, Michael F. Hagan

摘要:

胶体膜是棒状颗粒的单层组装体,其在胶体尺度上捕获脂质双层膜的长波长性质。最近对由手性杆状病毒形成的胶体膜的实验表明,引入具有不同长度和相反手性的第二种病毒导致筏的形成-一种病毒物种的微米大小的结构域漂浮在其他病毒的背景中[Sharma等人,Nature 513,77(2014)]。本文用液晶弹性理论研究了这种筏的相互作用。通过数值最小化的董事弹性自由能,我们预测的倾斜角分布为一个单一的筏和两个筏在背景膜,和两个筏之间的相互作用作为其分离的函数。我们发现,在背景膜的手性渗透深度设置的规模的相互作用的范围。我们比较我们的结果与实验数据,并找到良好的协议的相互作用的强度和范围。然而,与实验不同的是,我们没有观察到一个完全崩溃的数据时,重新调整的倾斜角在筏边缘。

英文摘要:

Colloidal membranes are monolayer assemblies of rodlike particles that capture the long-wavelength properties of lipid bilayer membranes on the colloidal scale. Recent experiments on colloidal membranes formed by chiral rodlike viruses showed that introducing a second species of virus with different length and opposite chirality leads to the formation of rafts --- micron-sized domains of one virus species floating in a background of the other viruses [Sharma et al., Nature 513, 77 (2014)]. In this article we study the interaction of such rafts using liquid crystal elasticity theory. By numerically minimizing the director elastic free energy, we predict the tilt angle profile for both a single raft and two rafts in a background membrane, and the interaction between two rafts as a function of their separation. We find that the chiral penetration depth in the background membrane sets the scale for the range of the interaction. We compare our results with the experimental data and find good agreement for the strength and range of the interaction. Unlike the experiments, however, we do not observe a complete collapse of the data when rescaled by the tilt angle at the raft edge.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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