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Structural evolution and control of Dutcher films.

Gavin A Buxton1, Nigel Clarke1

  • 1Department of Chemistry, University of Durham, Durham, United KingdomDH1 3LE. g.a.buxton@durham.ac.uk nigel.clarke@durham.ac.uk.

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Summary
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Numerical simulations reveal how van der Waals forces drive undulation growth in Dutcher films. These ultrathin trilayer films exhibit complex dynamics leading to groove formation and fluid pocketing.

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Area of Science:

  • Materials Science
  • Thin Film Physics
  • Computational Physics

Background:

  • Dutcher films are ultrathin trilayer structures with a fluid layer between two solid layers.
  • Van der Waals forces can induce spontaneous surface undulations and corrugations in these films.
  • The interplay of forces and fluid dynamics dictates undulation wavelength selection.

Purpose of the Study:

  • To numerically simulate the late-stage undulation growth in Dutcher films.
  • To investigate the role of elastic deformation and lateral forces in undulation dynamics.
  • To explore the formation of fluid pockets and grooves due to film contact and internal forces.

Main Methods:

  • Utilizing numerical simulations to model late-stage undulation growth.
  • Incorporating elastic stretching free energy to calculate lateral deformations.
  • Accounting for fluid dynamics and large-amplitude elastic effects.
  • Simulating the impact of thermal mismatch to induce internal forces.

Main Results:

  • Demonstrated the selection of a dominant undulation wavelength.
  • Showcased the influence of lateral deformations on normal pressure and fluctuation growth.
  • Modeled the corraling of fluid into isolated pockets as solid layers contact.
  • Simulated the formation of concentric grooves via thermal mismatch.

Conclusions:

  • The study provides insights into the complex physics governing undulation dynamics in Dutcher films.
  • Numerical simulations accurately capture large-amplitude elastic effects and late-stage phenomena.
  • The model's ability to incorporate internal forces opens possibilities for designing patterned thin films.