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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes

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Disintegration-controllable stimuli-responsive polyelectrolyte multilayer microcapsules via covalent layer-by-layer

Bin Mu¹, Chunyin Lu, Peng Liu

¹State Key Laboratory of Applied Organic Chemistry and Institute of Polymer Science and Engineering, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, PR China.

Colloids and Surfaces. B, Biointerfaces

|November 16, 2010

Summary

This summary is machine-generated.

Researchers developed novel stimuli-responsive polyelectrolyte multilayer microcapsules. These microcapsules, made from chitosan (CS) and oxidized sodium alginate (OSA), show controlled disintegration in response to pH and ionic strength.

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Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Stimuli-responsive materials offer advanced functionalities for controlled release and sensing applications.
Polyelectrolyte multilayer microcapsules provide a versatile platform for encapsulating various substances.
Developing microcapsules with tunable disintegration properties is crucial for targeted delivery systems.

Purpose of the Study:

To fabricate disintegration-controllable, stimuli-responsive polyelectrolyte multilayer microcapsules.
To investigate the influence of pH and ionic strength on microcapsule stability and disintegration.
To confirm the chemical structure and analyze the morphology of the synthesized microcapsules.

Main Methods:

Covalent layer-by-layer assembly using chitosan (CS) and oxidized sodium alginate (OSA) on sacrificial polystyrene sulfonate (PSS) templates.
Sacrificial template removal via dialysis.
Fourier-transform infrared (FTIR) spectroscopy for covalent crosslinking confirmation.
Transmission electron microscopy (TEM) for morphological analysis and size determination.

Main Results:

Successfully fabricated polyelectrolyte multilayer microcapsules with diameters under 200nm.
Confirmed covalent crosslinking within the microcapsule structure using FTIR.
Demonstrated that microcapsule diameter decreases with increasing pH or ionic strength.
Observed dual-responsiveness: stability in acidic/neutral media and disintegration in strong basic media.

Conclusions:

The synthesized polyelectrolyte multilayer microcapsules exhibit controlled disintegration triggered by pH and ionic strength.
These microcapsules are stable under acidic and neutral conditions but disintegrate in strongly basic environments.
The findings suggest potential applications in smart drug delivery and responsive material systems.