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Full-Text Articles in Physical Sciences and Mathematics
Effects Of Particle Shape On Growth Dynamics At Edges Of Evaporating Drops Of Colloidal Suspensions, Peter Yunker, Matthew Lohr, Tim Still, Alexei Borodin, Douglas Durian, Arjun Yodh
Effects Of Particle Shape On Growth Dynamics At Edges Of Evaporating Drops Of Colloidal Suspensions, Peter Yunker, Matthew Lohr, Tim Still, Alexei Borodin, Douglas Durian, Arjun Yodh
Douglas J. Durian
We study the influence of particle shape on growth processes at the edges of evaporating drops. Aqueous suspensions of colloidal particles evaporate on glass slides, and convective flows during evaporation carry particles from drop center to drop edge, where they accumulate. The resulting particle deposits grow inhomogeneously from the edge in two dimensions, and the deposition front, or growth line, varies spatiotemporally. Measurements of the fluctuations of the deposition front during evaporation enable us to identify distinct growth processes that depend strongly on particle shape. Sphere deposition exhibits a classic Poisson-like growth process; deposition of slightly anisotropic particles, however, belongs …
Centrifugal Compression Of Soft Particle Packings: Theory And Experiment, Kerstin Nordstrom, Emilie Verneuil, Wouter Ellenbroek, Tom Lubensky, Jerry Gollub, Douglas Durian
Centrifugal Compression Of Soft Particle Packings: Theory And Experiment, Kerstin Nordstrom, Emilie Verneuil, Wouter Ellenbroek, Tom Lubensky, Jerry Gollub, Douglas Durian
Douglas J. Durian
An exact method is developed for computing the height of an elastic medium subjected to centrifugal compression, for arbitrary constitutive relation between stress and strain. Example solutions are obtained for power-law media and for cases where the stress diverges at a critical strain—for example as required by packings composed of deformable but incompressible particles. Experimental data are presented for the centrifugal compression of thermo-responsive N-isopropylacrylamide (NIPA) microgel beads in water. For small radial acceleration, the results are consistent with Hertzian elasticity, and are analyzed in terms of the Young elastic modulus of the bead material. For large radial acceleration, the …