Small angle neutron scattering, SANS, was used to characterize the enhanced ordering
induced by magnetic and shear alignment of chiral nematic liquid crystals of cellulose microfibrils in
aqueous suspension. In a ∼2 T magnetic field the chiral nematic phase exhibits a uniform orientation
over an entire 10 mL sample. SANS data confirmed that the cholesteric axis of this phase aligns along
the magnetic field with implications that the distance between microfibrils is shorter along the cholesteric
axis than perpendicular to it. This is consistent with the hypothesis that cellulose microfibrils are helically
twisted rods. Under shear flow, the alignment of microfibrils changes from chiral nematic to nematic
with relative order increasing with increasing shear rate. The axial ratio (length/width) is the key
parameter in determining the relative order achieved and in determining the relaxation behavior after
shear ceases.
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