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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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pH-Controllable Enthalpically-Driven Interfacial Hydration of Strong Polyelectrolyte Brushes.

Yue Huang1, Xiaoxuan Zheng1,2, Guangtao Mei1

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Strong polyelectrolyte brushes (SPBs) exhibit pH-controllable interfacial hydration driven by enthalpy. This study reveals how pH influences hydrogen bonding and water ordering in poly(styrenesulfonate) brushes.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Surface Science

Background:

  • Understanding the thermodynamic mechanisms of pH-responsive materials is essential for advanced applications.
  • Strong polyelectrolyte brushes (SPBs) are versatile materials whose properties can be tuned by environmental factors like pH.
  • The interfacial hydration of SPBs is a key factor in their responsiveness but remains thermodynamically challenging to elucidate.

Purpose of the Study:

  • To investigate the thermodynamic driving force behind the pH-controllable interfacial hydration of strong polyelectrolyte brushes (SPBs).
  • To elucidate the role of hydrogen bonding and water molecule ordering at the PSS brush interface.
  • To provide a thermodynamic perspective on the pH-responsive behavior of SPBs.

Main Methods:

  • Utilized femtosecond sum frequency generation vibrational spectroscopy (SFG-VS) as an advanced surface-sensitive vibrational spectroscopic technique.
  • Employed the poly(styrenesulfonate) (PSS) brush as a model system to study interfacial phenomena.
  • Analyzed hydrogen bond interactions and water molecule ordering at the PSS brush surface under varying pH conditions.

Main Results:

  • SFG-VS identified hydrogen bond interactions between hydronium counterions and PSS chains, and revealed ordered water molecules at the PSS brush surface.
  • Increased pH led to enhanced hydrogen bonding between interfacial water and the PSS brush, disrupting the internal hydrogen-bond network.
  • Interfacial hydration of the PSS brush was observed with negative enthalpy (ΔH < 0) and entropy (ΔS < 0) changes, indicating enthalpically driven hydration.

Conclusions:

  • The pH-controllable interfacial hydration of PSS brushes is an enthalpically driven process.
  • This mechanism is likely applicable to other SPB systems, contributing to their pH-responsive properties.
  • The findings offer a thermodynamic understanding of SPB interfacial hydration, paving the way for new material science applications.