Schematic of the NFS setup used for the COLLOID experiment.
Drawing of the SODI-COLLOID module. A movable array of cells is mounted in front of the collection optics to allow measurement of multiple samples. Due to safety regulations for instruments that are operated on board the ISS, the module is enclosed in a sealed container that cannot be opened in orbit.
Photo of the COLLOID module hosted inside the Microgravity Science Glovebox that hosts all the ancillary systems for power and data communication and storage, instrument control and on board image processing.
Time evolution of the NVI for cell 2 during the first experimental run. Temperature inside the cell was progressively raised in order to locate the aggregation temperature Tagg. The vertical dotted line indicates the measured aggregation temperature, Tagg = 44.2 °C.
(a) An example of a raw PS J(q); (b) the MTF corresponding S(q) corrected for the MTF T(q).
Sequence of S(q) curves acquired during aggregation, at t = 200 s (squares), t = 700 s (circles) and t = 2100 s (crosses), time t = 0 being the beginning of aggregation. Solid curves are data fit with the corresponding Fisher-Burford curves.
(a) S(q) as a function of the lag time (1, 2, 4, 8, 16, 32, 64 s, from the bottom as indicated by the arrow); (b) example of correlation functions obtained from the S(q) for q = 0.3, 0.7, 1, 1.75 μm−1 (from above).
Example of the master curves obtained from data at two different temperatures. The curves have been fitted to data by imposing β = 1.05 (lower curve, Tagg) and β = 0.82 (upper curve Tagg + 0.40 K).
The modulation transfer function for the COLLOID Flight Model (open squares). The continuous line represents the differential cross section (arbitrary units) of polystyrene spheres 2 μm in diameter suspended in water for a wavelength λ = 935 nm, as a function of the transferred wave vector as obtained from Mie scattering calculations.
(a) Measured PS compensated for the MTF (squares) and the fitting TTF multiplied by a factor 104 (solid line); (b) the form factor S(q) after compensation for the modified Talbot effect.
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