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Related Experiment Video

Updated: Sep 22, 2025

Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
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Reversibly pH-Responsive Nanoporous Layer-by-Layer Microtubes.

Choonghyun Sung1, Yixin Ye2, Jodie L Lutkenhaus1

  • 1Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States.

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|May 21, 2022
PubMed
Summary

Researchers created nanoporous layer-by-layer (LbL) microtubes using poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA). Optimal pore formation occurred at pH 1.8, demonstrating a reversible and asymmetric structure.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Layer-by-layer (LbL) assembly is a versatile technique for fabricating multilayered materials.
  • Microtubes offer unique structural properties for various applications.
  • Controlling nanoporosity is crucial for material functionality.

Purpose of the Study:

  • To develop nanoporous layer-by-layer (LbL) microtubes using PAH and PAA.
  • To investigate the influence of pH, treatment time, and layer number on nanopore formation.
  • To characterize the resulting asymmetric porous structure.

Main Methods:

  • LbL deposition of poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) within porous templates.
  • Postassembly acid treatment to induce nanopore formation.
  • Systematic variation of solution pH, treatment duration, and number of deposited layers.

Main Results:

  • Nanoporous structure formation was optimized at pH 1.8.
  • A complete nanoporous transition was achieved in just 5 minutes.
  • The pore formation process was found to be reversible.
  • An asymmetric porous structure was observed, with a rough inner surface and a smoother outer surface with isolated pores.

Conclusions:

  • PAH/PAA LbL microtubes can be controllably fabricated with a tunable nanoporous structure.
  • Acid treatment is an effective method for generating nanoporosity in LbL assemblies.
  • The asymmetric nature of the porous structure offers potential for directional transport or filtration applications.