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Au-Interaction of Slp1 Polymers and Monolayer from Lysinibacillus sphaericus JG-B53 - QCM-D, ICP-MS and AFM as Tools for Biomolecule-metal Studies
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Response of adsorbed polyelectrolyte monolayers to changes in solution composition.

Maria Porus1, Plinio Maroni, Michal Borkovec

  • 1Department of Inorganic and Analytical Chemistry, University of Geneva, 30, Quai Ernest-Ansermet, 1205 Geneva, Switzerland.

Langmuir : the ACS Journal of Surfaces and Colloids
|November 23, 2012
PubMed
Summary

Responsive polyelectrolyte films swell significantly in low salt solutions due to increased electrostatic repulsion. This swelling is a collective process, crucial for creating adaptable layers from concentrated solutions.

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Area of Science:

  • Surface Science
  • Polymer Chemistry
  • Materials Science

Background:

  • Polyelectrolyte multilayers are versatile materials with tunable properties.
  • Understanding the response of adsorbed polyelectrolyte films to environmental changes is critical for their application.

Purpose of the Study:

  • To investigate the swelling behavior of adsorbed polyelectrolyte films in response to varying solution compositions.
  • To elucidate the role of electrostatic interactions and film concentration in polyelectrolyte film swelling.

Main Methods:

  • Utilized reflectometry and quartz crystal microbalance to measure dry and wet masses of adsorbed polyelectrolyte films.
  • Studied films of poly(allyl amine) (PAH), poly-L-lysine (PLL), and poly(styrene sulfonate) (PSS) on silica substrates.
  • Varied solution salt concentration and pH to observe film responses.

Main Results:

  • Films adsorbed from concentrated solutions exhibited reversible swelling up to twofold in low salt concentrations.
  • Swelling is attributed to enhanced repulsive electrostatic interactions between polyelectrolyte chains.
  • PAH films showed pH-dependent swelling and collapse with hysteresis, influenced by chain-surface interactions.

Conclusions:

  • Responsive polyelectrolyte layers exhibiting significant swelling are formed via adsorption from high polyelectrolyte and salt concentrations.
  • Swelling is a collective phenomenon driven by inter-chain electrostatic repulsion.
  • Dilute films formed from low concentrations show minimal swelling due to weak inter-chain interactions.