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"Self-Shaping" of Multicomponent Drops.

Diana Cholakova1, Zhulieta Valkova1, Slavka Tcholakova1

  • 1Department of Chemical and Pharmaceutical Engineering Faculty of Chemistry and Pharmacy, Sofia University , 1 James Bourchier Avenue, 1164 Sofia, Bulgaria.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 17, 2017
PubMed
Summary
This summary is machine-generated.

Multicomponent emulsion drops can self-shape into polygonal forms upon cooling, similar to single-component drops. Mixtures with specific alkane chain differences maintain shape, while others exhibit phase separation or self-emulsification.

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Area of Science:

  • Colloid and interface science
  • Materials science

Background:

  • Single-component emulsion drops can spontaneously form polygonal shapes upon cooling due to a plastic rotator phase.
  • Industrial applications often utilize multicomponent substances, necessitating an understanding of their behavior.

Purpose of the Study:

  • To systematically investigate the self-shaping behavior of multicomponent emulsion drops during cooling.
  • To identify factors influencing shape preservation and phase transitions in multicomponent systems.

Main Methods:

  • Preparation and cooling of multicomponent emulsion drops with varying alkane compositions.
  • Microscopic observation and analysis of drop shape evolution and phase behavior.

Main Results:

  • Multicomponent drops exhibit similar shape evolution to single-component drops, with additional shapes observed.
  • Shape preservation is possible for alkane mixtures with a chain length difference (Δn) ≤ 4; greater Δn leads to phase separation.
  • Plastification occurs for Δn ≤ 4 due to bulk rotator phase formation.
  • Mixtures containing a self-shaping compound can induce self-shaping in otherwise non-shaping compounds.
  • New self-emulsification mechanisms were observed, including particle disintegration for Δn > 4 due to phase separation.

Conclusions:

  • Multicomponent systems retain self-shaping capabilities, expanding the possibilities for particle design.
  • Careful selection of components is crucial for controlling shape preservation and preventing unwanted phase separation.
  • Understanding these phenomena is key for developing novel materials and processes in various industries.