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A modified method for elastic properties of nanowires based on surface effect.

Ji'an Li1, Zhengyu Cai1, Tingjun Wang1

  • 1School of Mechanics and Engineering Southwest Jiaotong University Chengdu 610031 People's Republic of China.

Nanotechnology
|May 13, 2020
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Summary

A new method predicts surface effect parameters in polyacrylonitrile (PAN) nanowires. Smaller diameter PAN nanowires exhibit higher effective Young

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Surface effects significantly influence the mechanical properties of nanomaterials.
  • Existing models for predicting surface effect parameters often show deviations.
  • Understanding these effects is crucial for designing nanostructures and nanodevices.

Purpose of the Study:

  • To develop a modified method for predicting surface effect parameters using experimental data.
  • To investigate the relationship between diameter and effective elastic moduli in polyacrylonitrile (PAN) nanowires.
  • To address deviations in existing surface effect parameter predictions by incorporating surface energy effects.

Main Methods:

  • Fabrication of polyacrylonitrile (PAN) nanowires via electrospinning (100 nm - 320 nm diameter).
  • Experimental determination of effective elastic moduli using contact atomic-force microscopy (C-AFM).
  • Development and validation of a modified surface effect parameter prediction method.

Main Results:

  • A clear inverse relationship was observed: effective Young's modulus increases as nanowire diameter decreases.
  • The modified prediction method, accounting for surface energy effects on bending, resolves existing deviations.
  • Experimental data validates the accuracy of the developed prediction method.

Conclusions:

  • The developed method accurately predicts surface effect parameters in PAN nanowires.
  • The findings highlight the critical role of surface energy in nanowire mechanics.
  • This research provides valuable insights for nanostructure and nanodevice design involving nanowires.