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Related Experiment Video

Updated: May 1, 2026

Giant Liposome Preparation for Imaging and Patch-Clamp Electrophysiology
09:03

Giant Liposome Preparation for Imaging and Patch-Clamp Electrophysiology

Published on: June 21, 2013

21.9K

Controlling nucleation in giant liposomes.

Chantel C Tester1, Michael L Whittaker, Derk Joester

  • 1Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois, USA. d-joester@northwestern.edu.

Chemical Communications (Cambridge, England)
|April 15, 2014
PubMed
Summary

Giant liposomes reveal how mineral precipitation transforms phases in tiny volumes. Confinement stabilizes amorphous calcium carbonate, while strontium and barium carbonates form crystalline structures.

Area of Science:

  • Materials Science
  • Biophysics
  • Geochemistry

Background:

  • Phase transformations of inorganic carbonates are crucial in geological and biological systems.
  • Understanding precipitation mechanisms at the nanoscale is challenging due to limited sample volumes.

Purpose of the Study:

  • To investigate the influence of confinement on carbonate precipitation and phase formation.
  • To explore phase transformations of calcium, strontium, and barium carbonates within giant liposomes.

Main Methods:

  • Utilized giant unilamellar vesicles (liposomes) as microreactors for picoliter-scale precipitation.
  • Employed techniques to observe and analyze the resulting mineral phases (e.g., amorphous vs. crystalline).

Main Results:

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Constant Pressure-controlled Extrusion Method for the Preparation of Nano-sized Lipid Vesicles
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  • Confinement within DPPC liposomes significantly stabilized amorphous calcium carbonate (ACC).
  • Amorphous strontium carbonate (ASC) was observed as a transient intermediate phase.
  • Barium carbonate (BaCO3) precipitation directly yielded crystalline witherite, bypassing amorphous intermediates.

Conclusions:

  • Giant liposomes provide a powerful platform for studying nanoscale precipitation and phase selection.
  • Lipid bilayer confinement plays a critical role in stabilizing amorphous mineral phases.
  • The cation (Ca2+, Sr2+, Ba2+) influences the precipitation pathway and final mineral structure.