Jammed elastic shells - a 3D experimental soft frictionless granular
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Jammed elastic shells - a 3D experimental soft frictionless granular
DOI: 10.1039/b000000x. 1 Supporting Information. Atomic force microscopy (AFM) The thickness of the shell was measured using Atomic Force Microscopy ...
Jammed elastic shells - a 3D experimental soft frictionless granular system† Jissy Jose,∗a Gerhard A. Blab,b‡ Alfons van Blaaderen and Arnout Imhof a Received Xth XXXXXXXXXX 20XX, Accepted Xth XXXXXXXXX 20XX First published on the web Xth XXXXXXXXXX 200X DOI: 10.1039/b000000x
1 Supporting Information A
B
image fit
RSEC (mm)
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RSEC (mm)
Atomic force microscopy (AFM) The thickness of the shell was measured using Atomic Force Microscopy (AFM, Digital Instrument, Nanoscope) in tapping mode. Samples for AFM were prepared by applying a drop of o suspension of the shells in ethanol (after removing the PDMS core) onto a glass cover slide. The collapse of the shells, due to drying, leads to plateaus in the height profile that correspond to twice the thickness of the shell.
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Fig. S1 (A) AFM image of a dried shell, after removing the PDMS core by washing with ethanol. (B) The height profile taken along the line drawn through the collapsed capsules shows plateaus from which we obtained a shell thickness of d = 56 nm.
Fig. S2 Plots of radius of smallest enclosing circle RSEC as a function of position along Z for (A) a typical ambiguous particle and particles containing (B) 2, (C) 6 and (D) 10 dimples. Except for the ambiguous particle, the data points obtained from image analysis (circles) are nicely fitted (line) by the equation of a circle, R2SEC = Rt2 − (Z − Zc )2 .
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Fig. S3 Distribution of the fractional part of the particle coordinates Xc , Yc and Zc found using the image analysis routine in an image volume 99.94 × 99.94 × 66 µ m3 . The histograms are almost flat in all three graphs which is a clear indication that particles are located with sub-pixel resolution.
