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Updated: Jan 22, 2026

Generation of Local CA1 &#947; Oscillations by Tetanic Stimulation
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Evolving polymersomes autonomously generated in and regulated by a semibatch pH oscillator.

Jinshan Guo1, Eszter Poros-Tarcali1, Juan Perez-Mercader2

  • 1Department of Earth and Planetary Science and Origin of Life Initiative, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA. jperezmercader@fas.harvard.edu.

Chemical Communications (Cambridge, England)
|July 19, 2019
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Summary

A novel bromate-sulfite pH oscillator drives autonomous polymersome generation via polymerization induced self-assembly (pH-O-PISA). This method controls radical generation for amphiphilic copolymer formation and polymersome morphology.

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Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Polymersomes offer tunable properties for drug delivery and nanotechnology.
  • Controlled polymerization is crucial for designing polymersomes with specific morphologies.
  • Autonomous systems for polymer self-assembly are highly desirable.

Purpose of the Study:

  • To develop a novel autonomous method for generating polymersomes.
  • To utilize a pH oscillator to control polymerization induced self-assembly (PISA).
  • To investigate the role of the oscillator in regulating copolymer formation and polymersome morphology.

Main Methods:

  • Employing a semibatch bromate-sulfite (B-S) pH oscillator.
  • Initiating polymerization of a hydrophobic monomer from a hydrophilic macromolecular chain transfer agent (mCTA).
  • Utilizing the oscillator to provide radicals for polymerization and control self-assembly.

Main Results:

  • Successfully demonstrated autonomous polymersome generation using the pH-O-PISA system.
  • The B-S oscillator effectively provided radicals for polymerization.
  • The system allowed for regulation of amphiphilic copolymer formation and polymersome morphology.

Conclusions:

  • The bromate-sulfite pH oscillator is a viable tool for autonomous polymersome synthesis.
  • pH-O-PISA offers a new pathway for controlled self-assembly of amphiphilic copolymers.
  • This approach provides a method to tune polymersome structures for advanced applications.