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A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization
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Micellar crystallization with a hysteresis in temperature.

Marco Walz1, Max Wolff, Nicole Voss

  • 1Crystallography and Structural Physics, University of Erlangen-Nürnberg, Staudtstrasse 3, 91058 Erlangen, Germany. walz@krist.uni-erlangen.de

Langmuir : the ACS Journal of Surfaces and Colloids
|August 21, 2010
PubMed
Summary

This study reveals triblock copolymer P123 in water exhibits distinct phase behaviors during heating and cooling. A significant hysteresis is observed, impacting micelle shape and viscosity.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Triblock copolymers like P123 are crucial in various applications due to their self-assembly properties.
  • Understanding their phase behavior in solution is essential for controlling material properties.

Purpose of the Study:

  • To investigate the phase diagram of P123 in water across different concentrations and temperatures.
  • To characterize the structural transitions and associated viscosity changes.

Main Methods:

  • Viscosity measurements were employed to monitor phase transitions.
  • Surface-sensitive neutron diffraction was used to identify the structures of different phases.
  • Phase diagrams were constructed for heating and cooling cycles.

Main Results:

  • A pronounced thermal hysteresis was observed between heating and cooling cycles.
  • During heating, a crystalline face-centered cubic (fcc) phase with high viscosity melts at 44 °C.
  • Upon cooling, a low-viscosity hexagonal phase forms first, followed by a high-viscosity fcc phase.

Conclusions:

  • The observed hysteresis is attributed to the micelle shape and dynamics during phase transitions.
  • The study provides detailed phase diagrams illustrating concentration and temperature-dependent behavior.
  • These findings are critical for the controlled use of P123 in solution-based applications.