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Controlling surface properties of polyelectrolyte multilayers by assembly pH.

Xiao Gong1

  • 1College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China. gongxiaopattern@gmail.com

Physical Chemistry Chemical Physics : PCCP
|May 21, 2013
PubMed
Summary
This summary is machine-generated.

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Adjusting assembly pH controls polyelectrolyte multilayer properties. Surface roughness and stiffness depend on the outermost layer, with poly(4-styrenesulfonic acid-co-maleic acid) (PSSMA) showing pH-dependent changes, unlike poly(diallyldimethylammonium chloride) (PDADMAC).

Area of Science:

  • Materials Science
  • Surface Chemistry
  • Polymer Science

Background:

  • Polyelectrolyte multilayers (PEMs) are versatile thin films with tunable properties.
  • Controlling PEM surface characteristics is crucial for advanced applications.
  • Assembly pH is a key factor influencing PEM formation and properties.

Purpose of the Study:

  • To investigate the effect of assembly pH on PEM surface properties.
  • To explore the role of the outermost layer (PDADMAC or PSSMA) in determining PEM characteristics.
  • To understand how pH influences morphology, roughness, stiffness, and wettability.

Main Methods:

  • Fabrication of PEMs using poly(diallyldimethylammonium chloride) (PDADMAC) and poly(4-styrenesulfonic acid-co-maleic acid) sodium salt (PSSMA 1:1).

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  • Systematic variation of assembly pH during layer-by-layer deposition.
  • Surface characterization using Scanning Force Microscopy (SFM) for morphology and roughness, nanoindentation for stiffness, and contact angle measurements for wettability.

    • Main Results:

    • Surface roughness and morphology of PEMs were significantly influenced by assembly pH when PSSMA was the outermost layer.
    • PEMs with PDADMAC as the outermost layer exhibited minimal changes in roughness and morphology with varying pH.
    • Stiffness and hardness of PSSMA/PDADMAC PEMs were tunable by assembly pH, particularly when PSSMA was the final layer.
    • Water contact angle hysteresis was affected by both surface roughness and hydrophilic groups, both influenced by assembly pH.

    Conclusions:

    • Assembly pH is a critical parameter for tailoring the surface properties of PEMs.
    • The choice of the outermost polyelectrolyte layer dictates the sensitivity of PEM properties to assembly pH.
    • PEMs offer a platform for developing materials with precisely controlled surface characteristics for diverse applications.