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<p>Evaluation of nanoparticle distribution and orientation within polymer nanocomposites is critical to ascertaining structure–property relationships but has been a challenge. Nanoparticles form multi-scale structures consisting of nanometer- and micrometer-scale agglomerations, requiring inspection of high resolution and large field of view (FOV) at the same time. Electron microscopy provides high-resolution 2D images of small FOV. Micro-computed tomography provides 3D images of moderate resolution and FOV, but is limited in its ability to resolve regions of similar elements such as polymers and carbon-based nanoparticles. In this work, an ultrasonic testing (UT) technique of a moderate resolution (sub-millimeter) was used to indirectly assess microstructures of carbon nanotubes (CNTs) within an epoxy matrix over a sizable volume (~ mm in all directions). CNTs were magnetically aligned and agglomerated using two different field strengths, and such CNT micro-structure change affected the fracture toughness data of CNT-epoxy nanocomposites. The propagation speed and energy loss (attenuation) of the reflected wave were correlated to changes of CNT orientation and distribution by magnetic field application.</p>

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Non-destructive assessment of aligned carbon nanotube structures through correlation of polymer nanocomposite properties via ultrasonic testing

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月6日

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  • Ricardo Braga Nogueira Branco,
  • Kohei Oyama,
  • Olivia J. Cook,
  • Grace M. Mu,
  • Andrea P. Argüelles,
  • Namiko Yamamoto,
  • Charles E. Bakis

摘要

Evaluation of nanoparticle distribution and orientation within polymer nanocomposites is critical to ascertaining structure–property relationships but has been a challenge. Nanoparticles form multi-scale structures consisting of nanometer- and micrometer-scale agglomerations, requiring inspection of high resolution and large field of view (FOV) at the same time. Electron microscopy provides high-resolution 2D images of small FOV. Micro-computed tomography provides 3D images of moderate resolution and FOV, but is limited in its ability to resolve regions of similar elements such as polymers and carbon-based nanoparticles. In this work, an ultrasonic testing (UT) technique of a moderate resolution (sub-millimeter) was used to indirectly assess microstructures of carbon nanotubes (CNTs) within an epoxy matrix over a sizable volume (~ mm in all directions). CNTs were magnetically aligned and agglomerated using two different field strengths, and such CNT micro-structure change affected the fracture toughness data of CNT-epoxy nanocomposites. The propagation speed and energy loss (attenuation) of the reflected wave were correlated to changes of CNT orientation and distribution by magnetic field application.