Photograph showing the open chamber, the magnetic assembly, and the sample holder (magnified). The heat exchanger in which the sample holder and sample are placed is visible inside the chamber.
Drawing of the low temperature SAXS chamber. 1—Sample holder, 2—N2 inlet, 3—electrical connector, 4—N2 outlet, 5—heat exchanger (red), 6—vacuum port, 7—magnetic assembly (dark gray) with micrometer screw to adjust the field strength on the sample.
Cold gas generator.
Strength of B x (T) as a function of y-distance from the magnet surface at x = z = 0. The inset shows the magnet assembly described in the text with beam access to the sample through the hole.
Illustration of the homogeneity of the magnetic field B x component at y = 10 mm. The beam intersects the sample at x = z = 0.
Normalized correlation function (colored symbols) measured on a dilute suspension of 50 nm (diameter) silica spheres in PPG425 at different temperatures. Solid lines are fits. The inset shows the viscosity obtained by XPCS and mechanical spectroscopy (MS) (Ref. 31). The blue diamond is data from the vendor.
SAXS patterns of the ferrofluid at 295 K parallel and perpendicular to the magnetic field. Dashed line q −4 is Porod's law. The inset shows the 2D pattern at B = 0.115 T and the averaging sectors.
Anisotropic correlation functions of the ferrofluid in the magnetic field B = 0.11 T at 190 K. The solid lines are simulations with a compressed exponential for ∥ and with a Gaussian velocity profile for ⊥.
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