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Wetting Transition of Ionic Substrate by Modulating Surface Charge Distribution.

Peng Jiang1,2, Hongguan Wu2, Leying Qing2

  • 1Key Laboratory of Green Chemical Process of Ministry of Education, Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China.

Langmuir : the ACS Journal of Surfaces and Colloids
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This summary is machine-generated.

Altering surface charge distribution tunes surface wettability. This study reveals how charge spacing and quantity impact substrate-liquid interactions, guiding antifouling material design.

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Area of Science:

  • Surface Science
  • Physical Chemistry
  • Materials Science

Background:

  • Surface wettability is critical for antifouling applications.
  • Modulating surface charge distribution is a key strategy for controlling wettability.
  • Understanding the relationship between charge distribution and wettability is essential for material design.

Purpose of the Study:

  • To theoretically investigate the mechanistic link between surface charge distribution and ionic substrate wettability.
  • To explore how different surface charge distributions affect interfacial thermodynamic properties.
  • To provide guidance for engineering surface wettability.

Main Methods:

  • Molecular density functional theory was employed.
  • Interfacial thermodynamic properties were investigated.
  • Simulations were performed for acetonitrile liquids on various ionic substrates at ambient conditions.

Main Results:

  • Variations in the spatial interval of discrete surface charges significantly alter substrate-acetonitrile interactions.
  • Interfacial tension oscillates with changes in charge distribution, enabling tuning from solvophobic to solvophilic.
  • Increasing charge quantity enhances the wettability tuning effect.

Conclusions:

  • Surface charge distribution is a powerful tool for precisely controlling surface wettability.
  • Theoretical insights guide the rational design of surfaces with tailored wettability for specific applications.
  • This work offers a fundamental understanding for developing advanced antifouling and related technologies.