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Related Experiment Video

Updated: Feb 2, 2026

Synthesizing Sodium Tungstate and Sodium Molybdate Microcapsules via Bacterial Mineral Excretion
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Mechano-responsive microcapsules with uniform thin shells.

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  • 1Soft Materials Laboratory, Institute of Materials, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland. esther.amstad@epfl.ch.

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|November 24, 2018
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Summary
This summary is machine-generated.

Researchers developed a novel method for creating ultra-thin, robust microcapsule shells. These uniform, 400 nm shells improve control over ingredient release and enable new material applications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Capsules extend shelf-life by preventing oxidation and reactions.
  • Controlled release of active ingredients requires well-defined capsule shells.
  • Fabricating mechanically stable microcapsules with sub-micrometer shells is challenging.

Purpose of the Study:

  • To develop a method for fabricating capsules with uniform, ultra-thin shells.
  • To improve control over the release kinetics of encapsulated substances.
  • To create mechanically robust capsules with minimal shell volume.

Main Methods:

  • Utilized water-oil-water double emulsions as templates for shell formation.
  • Fabricated capsules with uniform semi-permeable shells as thin as 400 nm.
  • Investigated mechanical stability and retention properties of the thin-shelled capsules.

Main Results:

  • Achieved uniform capsule shells with a thickness of 400 nm, occupying <2% of capsule volume.
  • Demonstrated mechanical robustness, withstanding pressures up to 1.3 MPa without deformation and up to 2.75 MPa without rupture.
  • Confirmed retention of low molecular weight encapsulants after drying and re-dispersion, despite water permeability.

Conclusions:

  • The novel method enables the controlled fabrication of ultra-thin, mechanically stable microcapsules.
  • These capsules offer enhanced control over release kinetics and minimize shell-related defects.
  • The thin-shelled capsules present new opportunities for functionalizing materials and creating advanced building blocks.