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Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
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Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also...
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Diffusiophoretic Fast Swelling of Chemically Responsive Hydrogels.

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Stimuli-responsive hydrogels swell and contract rapidly due to acid-induced ion release, a process explained by a novel "gel diffusiophoresis" mechanism. This discovery enhances hydrogel applications in drug delivery and soft robotics.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Polyacrylic acid hydrogels release stored ions when exposed to acid.
  • This ion release influences the gel's osmotic pressure and swelling behavior.
  • Existing models do not fully capture the rapid swelling dynamics observed.

Purpose of the Study:

  • To investigate the mechanism behind acid-induced rapid swelling and contraction cycles in polyacrylic acid hydrogels.
  • To develop a theoretical framework explaining the observed hydrogel actuation.
  • To explore the potential of this mechanism for advanced hydrogel applications.

Main Methods:

  • Experimental observation of ion release and hydrogel swelling dynamics.
  • Development of a continuum poroelastic theory.
  • Introduction and analysis of the
  • gel diffusiophoresis
  • mechanism.

Main Results:

  • Acid-induced ion release significantly increases gel osmotic pressure, leading to swelling rates exceeding solvent absorption.
  • A novel
  • gel diffusiophoresis
  • mechanism, driven by steric repulsion between gel polymers and ions, explains the rapid solvent intake and network expansion.
  • Gel expansion ceases as ion concentration gradients dissipate, followed by gel contraction.

Conclusions:

  • The developed poroelastic theory accurately explains the experimental hydrogel actuation cycles.
  • Engineering
  • gel diffusiophoresis
  • offers a pathway to stimuli-responsive hydrogels with enhanced strain rates and power output.
  • This mechanism has significant implications for drug delivery systems and soft robotics.