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Diffusion and Interaction Effects On Molecular Release Kinetics From Collapsed Microgels.

Adri Escañuela-Copado1, José López-Molina1, Matej Kanduč2

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We developed a model to predict how molecules are released from hydrogels. This model identifies two key release behaviors: diffusion-limited and reaction-limited, offering a tool for optimizing hydrogel applications.

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Area of Science:

  • Polymer Science
  • Physical Chemistry
  • Materials Science

Background:

  • Efficient molecular transport in dense hydrogel networks is vital for applications like drug delivery and water purification.
  • Molecular transport in hydrogels typically follows the solution-diffusion principle, involving dissolution and diffusion within the polymer matrix.

Purpose of the Study:

  • To investigate the nonequilibrium release kinetics of small molecules from microgel particles using dynamical density functional theory (DDFT).
  • To identify key parameters governing molecular release and establish predictive models for hydrogel-based systems.

Main Methods:

  • Utilized dynamical density functional theory (DDFT) to simulate molecular release from microgel particles.
  • Employed parameters from prior molecular simulations of thermoresponsive hydrogels.
  • Analyzed the influence of microgel radius, diffusion coefficient, and solvation free energy on release kinetics.

Main Results:

  • Identified two limiting regimes for molecular release: diffusion-limited (large, slow, poorly soluble molecules) and reaction-limited (small, fast, highly soluble molecules).
  • Demonstrated that microgel radius, diffusion coefficient, and solvation free energy are primary determinants of release kinetics.
  • Achieved excellent quantitative agreement between DDFT results and derived analytical equations for release time.

Conclusions:

  • Developed a valuable and straightforward analytical tool for predicting molecular release kinetics from microgels.
  • The findings provide insights into optimizing hydrogel performance for various applications by controlling molecular transport.
  • Understanding these release principles is crucial for designing advanced hydrogel-based drug delivery systems, sensors, and filtration membranes.