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A novel way for the alignment of lyotropic hexagonal and Lα phases in magnetic fields

  • Annette FischerEmail author
  • HeinzS Hoffmann
  • Peter Medick
  • Ernst Rössler
Conference paper
Part of the Progress in Colloid and Polymer Science book series (PROGCOLLOID, volume 121)

Abstract

An ionically charged Lα phase can be prepared without shear by mixing a small amount of meth-ylformiate to an L3 phase from alkyldimethylaminoxide, hexanol and water. If the structural transformation induced by the hydrolysis reaction of the ester is carried out in the presence of a high magnetic field, a macroscopically aligned lamellar phase is obtained. The alignment process was studied by 2H NMR measurements. The NMR measurements allow the determination of the rate constant of the alignment process and at the same time they can be used to control the degree of macroscopic orientation of the system. In addition, we studied the formation and the alignment process of a hexagonal lyotropic mesophase. The hexagonal phase can be prepared without shear by protonating a highly concentrated alkyldimethylaminoxide solution. The reaction that is used for the protonation is the hydrolysis reaction of methylformiate to formic acid and methanol.

Key words

Lamellar phase Hexagonal phase Alignment process 2H NMR measurements 

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Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • Annette Fischer
    • 1
    Email author
  • HeinzS Hoffmann
    • 1
  • Peter Medick
    • 2
  • Ernst Rössler
    • 2
  1. 1.Experimentalphysik IIUniversity of BayreuthBayreuthGermany
  2. 2.Physical Chemistry IUniversity of BayreuthBayreuthGermany

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