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Flow fields control nanostructural organization in semiflexible networks.

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Soft Matter
|May 30, 2020
PubMed
Summary

We developed a flow-stop technique using polarized optical microscopy (POM) to measure nanofibril dynamics in flowing systems. This method reveals how flow affects nanofibril orientation and diffusion, crucial for assembling advanced materials.

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Biophysics

Background:

  • Hydrodynamic alignment of nanofibrils is key for creating 3D structures.
  • Understanding non-equilibrium dynamics in flowing nanofibrils is crucial for structural control but is limited by characterization methods.

Purpose of the Study:

  • To present and demonstrate a novel flow-stop technique for in situ dynamic characterization of nanofibrils.
  • To quantify the anisotropic orientation and diffusivity of nanofibrils under shear and extensional flows.
  • To correlate nanoscale dynamics with macroscopic structural assembly.

Main Methods:

  • Developed and applied a flow-stop technique combined with polarized optical microscopy (POM).
  • Utilized small-angle X-ray scattering (SAXS) for simultaneous structural analysis.
  • Quantified nanofibril orientation, diffusivity, and structural changes in response to flow.

Main Results:

  • Observed multi-timescale diffusivity in polydisperse systems, linked to apparent fibril lengths and entanglements.
  • Correlated fastest diffusivity to velocity gradient strength, irrespective of flow type (shear or extension).
  • Demonstrated that extensional flow induces higher anisotropy and interfibrillar contacts, slowing diffusion.

Conclusions:

  • The flow-stop technique provides essential nanoscale insights into nanofibril dynamics.
  • Understanding nanoscale physics is critical for designing fluidic systems for fibrillar building block assembly.
  • Results highlight the need for precise control over flow conditions to achieve desired macrostructure properties.