Hygroscopic study of hydroxypropylcellulose: Structure and strain-induced birefringence of capillary bridges

MH Godinho, P. Pieranski, P. Sotta

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Abstract.: The hygroscopic method developed previously for studies of lyotropic liquid crystals is used for the first time in experiments with millimetric capillary bridges made of a hydroxypropylcellulose/water mixture. Composition of such very small samples is controlled via humidity of the surrounding air. By a slow and well-controlled drying of initially isotropic samples, the isotropic/anisotropic phase transition is crossed and polydomain pseudo-isotropic capillary bridges are prepared. Kept in an atmosphere of constant humidity, these bridges are stretched and the strain-induced birefringence ∆n is measured as a function of the draw ratio λ. The variation of ∆n with λ is interpreted in terms of an affine uniaxial deformation of the initial pseudo-isotropic texture.

Original languageEnglish
Article number89
Number of pages14
JournalEuropean Physical Journal E
Volume39
Issue number9
DOIs
Publication statusPublished - 29 Sep 2016

Keywords

  • OPTICAL-PROPERTIES
  • LIQUID-CRYSTALS
  • PHASE-DIAGRAM
  • WATER
  • (HYDROXYPROPYL)CELLULOSE
  • ORIENTATION
  • SHEAR
  • NMR

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