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Fig. 2. (a) Schematic diagram of the flexure-based micro-rheometer. The fluid
sample is sheared between two interferometrically aligned flat plates (A). The
compound flexure system (B) is actuated by an `inchworm' motor (C) and
provides a planar (Couette) shear flow. The shear stress is deduced from the
corresponding deflection of the top fixture as detected by an inductive sensor
(D). (b) Shear viscosity of the native silk dope. Diamonds (and shaded red
area) correspond to Nephila clavipes spider; open circles (and blue
shaded area) are from Bombyx mori silkworm. The solid lines (blue for
silkworm and red for spider) represent the Carreau-Yasuda fit from Eqn 2 to
experimental data (markers). Reproducibility was confirmed by testing
specimens from two other spiders and silkworms whose abdomens were similar in
size. The variation in the data is represented by the shaded band.
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