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Related Concept Videos

Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...

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Related Experiment Video

Updated: May 26, 2026

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
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Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure

Published on: April 17, 2018

Microemulsions with a HIPME (high internal phase microemulsion) structure.

L Wolf1, H Hoffmann, T Teshigawara

  • 1BZKG/BayKoll, University of Bayreuth, Gottlieb-Keim-Strasse 60, D-95448 Bayreuth, Germany. lukas.wolf@freenet.de

The Journal of Physical Chemistry. B
|December 23, 2011
PubMed
Summary
This summary is machine-generated.

This study reveals a novel microemulsion phase diagram with a unique structural transition. A high internal phase microemulsion (HIPME) forms, showing distinct water-in-oil structures with polyhedral water droplets.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Physical Chemistry

Background:

  • Microemulsions are thermodynamically stable, optically isotropic liquids.
  • Surfactant mixtures can alter microemulsion phase behavior and structure.
  • Understanding phase transitions is crucial for designing novel materials.

Purpose of the Study:

  • To investigate the phase diagram of a novel oil-water microemulsion system.
  • To characterize structural transitions within the microemulsion's isotropic channel.
  • To identify and visualize novel microemulsion structures.

Main Methods:

  • Phase diagram determination for a microemulsion with anionic and nonionic surfactants.
  • Measurement of conductivity and viscosity across the phase diagram.
  • Cryogenic transmission electron microscopy (cryo-TEM) for structural imaging.

Main Results:

  • An optically isotropic channel was observed, transitioning abruptly with increasing oil content.
  • Conductivity decreased by three orders of magnitude, indicating a structural shift.
  • Cryo-TEM revealed a novel polyhedral water-in-oil structure, termed high internal phase microemulsion (HIPME).

Conclusions:

  • The novel microemulsion exhibits an abrupt structural transition from bicontinuous to water-in-oil (w/o) structures.
  • HIPME structures, characterized by polyhedral water droplets, were successfully visualized.
  • This discovery offers new possibilities for designing advanced functional materials.