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A novel rheo-optical device for studying complex fluids in a double shear plate geometry
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Image of FIG. 1.
FIG. 1.

The RheOptiCAD® (in black in the center of the image) mounted on an inverted CLSM.

Image of FIG. 2.
FIG. 2.

Example of zero velocity plane adjustment in order to focus on a plane inside of the free working distance. Left image: both plates move at the same rate, therefore the ZVP falls right in between the two plates, and partly outside the ZVP. Right image: V 1 is higher than V 2, therefore the ZVP is shifted towards the bottom plate into the middle of the free working distance.

Image of FIG. 3.
FIG. 3.

3D-images of the RheOptiCAD®.

Image of FIG. 4.
FIG. 4.

Functional scheme of the piloting software.

Image of FIG. 5.
FIG. 5.

Parallelism and planarity of plates validated by a laser reflective method. 800 images (512 × 32 pixels) are adjoined in the z-axis direction for three different x-positions. Intensity profiles are plotted to the left of each z-stack and arrows indicate a maximum intensity value corresponding to a reflection.

Image of FIG. 6.
FIG. 6.

z-position of each plate versus x-position over the entire length of a lateral travel. Gap width was 500 μm. Plotted points and standard deviation correspond to 3 repeats with 3 different pairs of microscopy slides. Dashed lines reveal the perfect planarity.

Image of FIG. 7.
FIG. 7.

Evolution of plate position versus time for different strain jump amplitudes. (a) Between 0 and 1.2 s, (b) same results but between 0 and 0.02 s and positions between −0.02 and 0.02 mm.

Image of FIG. 8.
FIG. 8.

Comparison of continuous deformations for = 0.1 s−1 (a), = 1 s−1 (b), and = 10 s−1 (c).

Image of FIG. 9.
FIG. 9.

Images in the velocity-gradient plane for different velocity ratios v b /v t : 1 (a), 0.36 (b), and 0.13 (c). Gap width was 500 μm, and height of the image is the same as the width of the gap.

Image of FIG. 10.
FIG. 10.

Example of oscillating motion (A = 0.2 mm, f = 0.5 Hz) of microgel containing fluorescent microspheres (ϕ = 1 μm) at T = 20 °C. Gap width was 700 μm. Accordance between images over time and theoretical signal (white line).

Image of FIG. 11.
FIG. 11.

Images of bread dough submitted to an oscillation motion at t = 0 s (a, c) and t = 3 s (b, d) for 2 water content recipes: Recipe A = 55 wt. % and Recipe B = 60 wt. %. White pixels represent the gluten-protein network and black pixels correspond to air bubbles and starch granules.


Generic image for table
Table I.

Comparison of target values, specifications, and the real values of the shear cell.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A novel rheo-optical device for studying complex fluids in a double shear plate geometry