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Related Experiment Video

Updated: May 2, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Published on: May 20, 2014

Novel method for visualizing water transport through phase-separated polymer films.

Anna Jansson¹, Catherine Boissier², Mariagrazia Marucci²

¹1 Department of Applied Physics, Chalmers University of Technology, SE-41296 Gothenburg, Sweden.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada

|February 26, 2014

Summary

This study introduces a new method to observe how polymer films interact with water, revealing crucial details about drug release from coatings. The findings help in designing better pharmaceutical coatings by understanding water transport properties.

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Last Updated: May 2, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Published on: May 20, 2014

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Area of Science:

Materials Science
Pharmaceutical Science
Chemical Engineering

Background:

Polymeric coating films control drug release in oral formulations.
Coating film-water interactions significantly impact composition and permeability.
Understanding these interactions is key for developing advanced pharmaceutical coatings.

Purpose of the Study:

To present a novel method for controlled wetting of polymer coating films.
To provide direct visual insights into film behavior during wetting and drying.
To analyze structure-mass transport relationships in polymer films.

Main Methods:

Utilized an environmental scanning electron microscope for in situ observation.
Employed free films of phase-separated ethyl cellulose (EC) and hydroxypropyl cellulose (HPC) blends.
Varied the EC/HPC blend ratio to investigate water transport properties.

Main Results:

Directly observed local variations in water transport through EC/HPC films.
Established immediate correlations between film structure and mass transport.
Quantified HPC leaching by in situ water evaporation, showing composition-dependent differences.

Conclusions:

The novel environmental scanning electron microscopy method offers dynamic insights into polymer-water interactions.
This technique complements traditional diffusion and microscopy experiments.
Findings are valuable for optimizing polymer coating design for controlled drug delivery.