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Donnan potentials in aqueous phase-separated polymer mixtures.

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Adding electric charge to polymers in water solutions influences their phase separation. This charge can stabilize water-in-water emulsions by creating an interfacial electric potential, offering new design possibilities.

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Area of Science:

  • Physical Chemistry
  • Polymer Science
  • Electrochemistry

Background:

  • Texturizing water via polymer addition leads to phase separation.
  • Phase stability in aqueous polymer solutions depends on chemical differences and electric charge.

Purpose of the Study:

  • To investigate the effect of electric charge on the phase stability of aqueous polymer solutions.
  • To measure the electric potential difference between coexisting phases in charged and uncharged polymer solutions.

Main Methods:

  • Direct electrochemical measurements of interfacial electric potential.
  • Studying aqueous solutions of charged fish gelatin and uncharged dextran.
  • Analyzing phase separation behavior and critical points.

Main Results:

  • Electric charge counteracts polymer demixing due to entropic costs of counterion confinement.
  • Increased polymer charge significantly shifts the critical point of phase separation.
  • A Donnan potential develops upon phase separation, directly proportional to concentration differences.

Conclusions:

  • Electrostatic interactions play a crucial role in polymer phase separation in aqueous solutions.
  • The Donnan potential can be theoretically explained and directly measured.
  • Electrostatics offers a novel approach for developing stable water-in-water emulsions.