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Measuring the Time-Evolution of Nanoscale Materials with Stopped-Flow and Small-Angle Neutron Scattering
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Microfluidic devices for small-angle neutron scattering.

Carlos G Lopez1, Takaichi Watanabe1, Marco Adamo1,2

  • 1Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK.

Journal of Applied Crystallography
|June 14, 2018
PubMed
Summary
This summary is machine-generated.

This study compares materials for microfluidic devices used in small-angle neutron scattering (SANS). Boron-free glass and polymer approaches offer rapid prototyping, while glass and silicon provide enhanced durability for demanding SANS applications.

Keywords:
closed-face polymer photolithographylab-on-a-chipmicrofluidic devicessmall-angle neutron scattering

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Area of Science:

  • Materials Science
  • Neutron Scattering Physics
  • Microfluidics Engineering

Background:

  • Small-angle neutron scattering (SANS) requires specialized sample environments.
  • Microfluidic devices offer advantages for in-situ SANS experiments.
  • Material selection is critical for optimal SANS device performance.

Purpose of the Study:

  • To comparatively evaluate materials and fabrication methods for microfluidic devices for SANS.
  • To assess device performance based on neutronics, spatial resolution, and mechanical properties.
  • To identify suitable microfluidic SANS device solutions for various experimental needs.

Main Methods:

  • Fabrication and testing of microfluidic devices using inorganic glasses, metals, and polymers.
  • Evaluation under typical SANS configurations.
  • Assessment of neutron absorption, scattering background, activation, spatial resolution, chemical compatibility, pressure resistance, cost, durability, and manufacturability.

Main Results:

  • Closed-face polymer photolithography with boron-free glass plates is suitable for rapid prototyping, achieving high neutron transmission (∼98%) and low background.
  • Sintered or etched boron-free glass and silicon devices provide superior durability, chemical, thermal, and pressure resistance.
  • Commercial availability of advanced microfluidic SANS devices is increasing.

Conclusions:

  • Polymer-based microfluidic SANS devices are attractive for rapid prototyping due to ease of fabrication and good neutronic properties.
  • Boron-free glass and silicon microfluidic devices are recommended for applications demanding high durability and resistance.
  • Material choice depends on balancing performance requirements with fabrication complexity and cost for SANS experiments.