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Engineering functionality gradients by dip coating process in acceleration mode.

Marco Faustini1, Davide R Ceratti, Benjamin Louis

  • 1Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, UMR 7574, Chimie de la Matière Condensée de Paris, F-75005 Paris, France.

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Summary

Researchers developed a novel dip-coating method to create functional thin films with controlled thickness gradients. This versatile technique is adaptable for large-scale production and various materials, enabling custom device fabrication.

Keywords:
dip-coatinggradientphotonicsthin filmswetting

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Fabricating functional devices with controlled property gradients is challenging.
  • Existing methods often lack versatility and scalability for gradient thin film production.

Purpose of the Study:

  • To introduce a novel dip-coating technique in acceleration mode for creating tailored gradient functional devices.
  • To demonstrate the adaptability of this method across diverse material systems and scales.

Main Methods:

  • Utilized a dip-coating process in acceleration mode to control thin film thickness profiles.
  • Investigated the influence of coating speed, evaporation rate, and viscosity on film formation.
  • Applied the technique to various materials including metal oxides, block copolymers, and photoresists.

Main Results:

  • Achieved "on-demand" thickness graded profiles at the submillimeter scale.
  • Demonstrated successful fabrication of functional devices with gradients in structural, chemical, and dimensional properties.
  • Created novel devices such as optical mirrors with bidirectional gradients, photonic crystals with graded stop-bands, and microfluidic channels.

Conclusions:

  • The dip-coating in acceleration mode offers an easy, versatile, and scalable approach for fabricating gradient functional thin films.
  • This technique enables the development of advanced functional devices with precisely controlled property variations.
  • The method holds significant potential for applications in optics, microfluidics, and beyond.