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Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Wetting phenomena, including dynamic contact angles, are crucial for industrial applications like printing and coating.
  • Current optical methods lack the spatial resolution needed for precise measurements, especially with aqueous solutions.
  • Understanding dynamic contact angles at the microscale is essential for process optimization.

Purpose of the Study:

  • To develop and demonstrate a novel X-ray imaging technique for high-resolution measurement of dynamic receding contact angles.
  • To investigate the relationship between contact line velocity and dynamic receding contact angle on a microscale.
  • To overcome the limitations of existing optical methods in studying dynamic wetting phenomena.

Main Methods:

  • Utilized X-ray phase contrast imaging (XPCI) to achieve submicroscopic resolution.
  • Measured the dynamic receding contact angle of glycerol-Milli-Q water mixtures on a 17 μm diameter moving glass fiber.
  • Achieved a holographic resolution of 50 nm/pixel with a spatial error of 450 nm.

Main Results:

  • Observed that the dynamic receding contact angle decreased as the contact line velocity increased across all tested liquid mixtures.
  • Demonstrated the capability of X-ray holography to resolve fine details of the wetting process.
  • Quantified the dynamic receding contact angle with unprecedented spatial resolution.

Conclusions:

  • X-ray holography is a feasible and powerful method for investigating dynamic contact angle phenomena at the microscale.
  • The study opens new avenues for achieving higher spatial and temporal resolution in dynamic wetting research.
  • Findings contribute to a better quantitative understanding of wetting dynamics in industrially relevant scenarios.