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The mechanical properties of crystalline materials can be substantiallymodified under confinement. Such modified macroscopic properties are usuallygoverned by the altered microstructures and internal stress fields. Here, weuse a parallel plate geometry to apply a quasi-static squeeze flow crushing acolloidal polycrystal while simultaneously imaging it with confocal microscopy.The confocal images are used to quantify the local structure order and, inconjunction with Stress Assessment from Local Structural Anisotropy (SALSA),determine the stress at the single-particle scale. We find that duringcompression, the crystalline regions break into small domains with differentgeometric packing. These domains are characterized by a pressure and deviatoricstress that are highly localized with correlation lengths that are half thosefound in bulk. Furthermore, the mean deviatoric stress almost doubles,suggesting a higher brittleness in the highly-confined samples.

Relating Microstructure and Particle-level Stress in Colloidal Crystals Under Increased Confinement