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Synthesis and Characterization of Supramolecular Colloids
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Self-assembly of colloidal superstructures in coherently fluctuating fields.

Igor M Kulić1, Miodrag L Kulić

  • 1CNRS, Institute Charles Sadron, 23 rue du Loess, BP 84047, 67034 Strasbourg, France.

Physical Review Letters
|November 26, 2013
PubMed
Summary

This study introduces a new theory for the nonequilibrium van der Waals force, explaining self-organized structures in colloids. These structures, like dipolar foams, exhibit unique properties and sensitivity to fields.

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Area of Science:

  • Physics
  • Colloid Science
  • Soft Matter

Background:

  • The van der Waals force governs fluid structures from microscopic to macroscopic scales.
  • This force arises from interactions between polarizable objects.
  • Existing theories primarily address equilibrium conditions.

Purpose of the Study:

  • To derive a general theory for the nonequilibrium van der Waals force.
  • To explain the emergence of self-organized morphologies in colloidal systems.
  • To investigate the properties of these novel structures, such as dipolar foams.

Main Methods:

  • Derivation of a general theory for nonequilibrium van der Waals forces.
  • Analysis of spatially coherently fluctuating electromagnetic fields.
  • Application of the theory to magnetic and dielectric colloid systems.

Main Results:

  • Description of a novel hierarchy of self-organized morphologies.
  • Identification of dipolar foams as striking colloidal superstructures.
  • Demonstration of swelling against gravity and high sensitivity to applied fields.
  • Derivation of the equation of state for materials formed by the coherent van der Waals force.

Conclusions:

  • The derived theory successfully explains experimental observations in paramagnetic colloidal systems.
  • The theory provides a framework for understanding complex colloidal self-organization.
  • Further experiments are proposed to validate the theory's predictions.