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Surface Wrinkling on Polymer Films.

Belda Amelia Junisu1, Iris Ching-Ya Chang1, Chia-Chi Lin1

  • 1Department of Chemical and Materials Engineering, National Central University, Taoyuan 32001, Taiwan.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 17, 2022
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Summary
This summary is machine-generated.

Gold precursor solutions with varying K2CO3 content influence the hydrolysis of tetrachloroaurate(III) ions. This affects the wrinkling of poly(4-vinyl pyridine) films, with wrinkle characteristics correlating to ion content and film properties.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Gold precursor solutions are crucial for nanomaterial synthesis.
  • Poly(4-vinyl pyridine) (P4VP) films exhibit tunable surface properties.
  • Surface wrinkling is a phenomenon driven by mechanical instability.

Purpose of the Study:

  • To investigate the effect of potassium carbonate (K2CO3) on gold precursor solutions.
  • To explore the formation of wrinkled P4VP films.
  • To correlate precursor solution chemistry and film properties with wrinkle characteristics.

Main Methods:

  • Preparation of gold precursor solutions with varying HAuCl4 and K2CO3 concentrations.
  • Spin coating of P4VP films of different molecular weights and thicknesses.
  • Induction of surface wrinkling via swelling and drying.
  • Analysis of wrinkle periodicity and amplitude.

Main Results:

  • Increasing K2CO3 content in gold precursor solutions promotes the hydrolysis of AuCl4- ions to [AuCl4- (OH)]- complex ions.
  • P4VP films exhibit periodic surface wrinkling upon immersion in aqueous solutions and drying.
  • Wrinkle periodicity and amplitude are strongly correlated with initial film thickness, AuCl4- ion content, and residual stress.

Conclusions:

  • The composition of gold precursor solutions significantly impacts the chemistry of dissolved gold species.
  • Surface wrinkling in P4VP films is a controllable process influenced by precursor chemistry and film mechanics.
  • This study provides insights into the rational design of wrinkled surfaces for potential applications.