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Related Experiment Video

Updated: Oct 30, 2025

Procedure for the Transfer of Polymer Films Onto Porous Substrates with Minimized Defects
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Porous Layer-by-Layer Films Assembled Using Polyelectrolyte Blend to Control Wetting Properties.

Choonghyun Sung1, Yejin Heo1

  • 1Division of Advanced Materials Engineering, Dong-Eui University, Busan 47340, Korea.

Polymers
|July 2, 2021
PubMed
Summary

Researchers created novel porous superwetting surfaces using a blend of polymers in layer-by-layer films. Acid treatment controlled surface structure, enhancing water repellency and creating slippery surfaces for advanced applications.

Keywords:
layer-by-layerpolyelectrolyte multilayerporousroughnessslipperywetting

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Layer-by-layer (LbL) films are used for superwetting surfaces.
  • Existing LbL films are limited to two oppositely charged polyelectrolytes.
  • Controlling surface morphology is key for advanced material properties.

Purpose of the Study:

  • To develop novel porous LbL films with tunable surface morphologies.
  • To investigate the effect of polymer blends and acid treatment on film properties.
  • To assess the superwetting and slippery surface capabilities of the fabricated films.

Main Methods:

  • Assembling LbL films using a cationic polymer blend (branched poly(ethylene imine) (BPEI) and poly(allylamine hydrochloride) (PAH)) and anionic poly(acrylic acid).
  • Acid-treating the LbL films at pH 1.8-2.0 to induce porosity.
  • Coating the porous films with fluorinated silane and infusing with lubricant oil.

Main Results:

  • Varying BPEI/PAH ratios in LbL films resulted in diverse surface morphologies.
  • Fluorinated films with 50% PAH achieved high water contact angles (140-150°).
  • The fabricated surfaces exhibited low water (10-20°) and oil (5-10°) sliding angles, with BPEI/PAH blends showing superior performance.

Conclusions:

  • Acid treatment of blended polyelectrolyte LbL films effectively controls surface morphology.
  • The developed porous films demonstrate significant potential for superwetting and slippery surface applications.
  • This approach offers a versatile method for designing advanced functional surfaces.