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SANS Study of Chirality and Order in Liquid Crystalline Cellulose Suspensions

  • W.J. Orts (a1), J.-F. Revol (a2), L. Godbout (a2) and R.H. Marchessault (a2)

Abstract

Small angle neutron scattering, SANS, was used to describe the magnetic alignment and in situ shear ordering of polyelectrolytic, liquid crystalline cellulose microfibrils in aqueous (D2O) suspension. In a 2.4 Tesla magnetic field, microfibril suspensions exhibit anisotropic chiral nematic (cholesteric) ordering in which the distance between nematic planes along the cholesteric axis is shorter than between rods within a nematic plane. This is consistent with the hypothesis that cellulose microfibrils are helically twisted rods. During shear, the SANS interference peaks perpendicular to the flow direction sharpen with increasing shear rate. Yet, the highest degree of alignment (for microfibrils with axial ratios of ~45) was observed a short period after the cessation of shear flow.

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SANS Study of Chirality and Order in Liquid Crystalline Cellulose Suspensions

  • W.J. Orts (a1), J.-F. Revol (a2), L. Godbout (a2) and R.H. Marchessault (a2)

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