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Mechanical properties of normal and binormal double nanohelices

机译：正常和二英双纳米机的力学性能

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摘要

Double helix structures, ubiquitous in nature from nano-to macro-scales, have attracted particular interest due to their unique morphology. Compared to the double nanohelices with the commonest circular cross sections, those with asymmetric cross sections have better mechanical properties for applications in micro-/nanoelectromechanical systems (MEMS/NEMS). In this paper, a novel theoretical basis is proposed based on the extensible Cosserat curve for quantitatively exploring statics and dynamics of the double nanohelices with elliptic cross sections. The normal double nanohelices made up of straight wires rather than single helices are quantitatively confirmed to excel the binormal and rope-like double nanohelices in both load capacity and elasticity, and retain the mechanical stability at the same time. We obtain the interlocking helix angle as well as the minimum boundary value of semiaxes ratio to form a tightly packed double helix. A set of expressions are derived that can be used to measure the mechanical properties of the double helix system under uniaxial stretching, such as the interaction between the strands, tensile modulus and torque. The present work provides useful information for future experimental investigation on normal and binormal double nanohelices as well as their applications in micro-/nanoscale devices.
机译：从纳米至宏观尺度的双螺旋结构，普遍存在的本质上，由于其独特的形态而感到特别感兴趣。与具有最常用的圆形横截面的双纳米角质相比，具有不对称横截面的那些具有更好的机械性能，用于微/纳米机电系统（MEMS / NEM）。在本文中，基于可伸长的Cosserat曲线提出了一种新颖的理论基础，用于使用椭圆形横截面定量探索双纳米热型的静脉曲张和动力学。由直线而不是单螺旋组成的正常双纳米被定量地确认，以在负载能力和弹性中剔除双齿绳和绳索状双纳米，并同时保持机械稳定性。我们获得了互锁螺旋角度以及半轴比的最小边界值，形成了紧密包装的双螺旋。推导出一组表达式，其可用于测量单轴拉伸下双螺旋系统的机械性能，例如股线之间的相互作用，拉伸模量和扭矩。本作本作提供了有用的信息，以备将来对正常和二英纳米纳米的实验调查以及它们在微/纳米级装置中的应用。

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  • 来源
    《RSC Advances》 |2015年第6期|共8页
  • 作者

    Dai Lu; Huang Xiaojiang; Zhang Lin; Zhang Li; Ge Lijuan;

  • 作者单位

    Suzhou Univ Sci &

    Technol Sch Math &

    Phys Suzhou 215009 Peoples R China;

    Donghua Univ Coll Sci Shanghai 201620 Peoples R China;

    Chinese Univ Hong Kong Dept Mech &

    Automat Engn Hong Kong Hong Kong Peoples R China;

    Chinese Univ Hong Kong Dept Mech &

    Automat Engn Hong Kong Hong Kong Peoples R China;

    Suzhou Univ Sci &

    Technol Sch Math &

    Phys Suzhou 215009 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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