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Random packings of spheres and spherocylinders simulated by mechanical contraction.
- S. R. Williams, A. Philipse
- Materials SciencePhysical review. E, Statistical, nonlinear, and…
- 1 May 2003
A simulation technique for creating dense random packings of hard particles is introduced, particularly suited to handle particles of different shapes, and Comparisons between the equilibrium phase diagram for hard spherocylinders and the densest possible amorphous packings have interesting implications on the crystallization of sphero cylinders as a function of aspect ratio.
The Random Contact Equation and Its Implications for (Colloidal) Rods in Packings, Suspensions, and Anisotropic Powders
- A. Philipse
- Materials Science
- 6 March 1996
The experimentally observed asymptotic scaling φ(L/D) = constant, for the random packing volume fraction (φ) of rods with high aspect ratio (L/D), is shown to be the consequence of uncorrelated…
Effect of particle shape on the density and microstructure of random packings.
- A. Wouterse, Stephen R. Williams, A. Philipse
- Materials ScienceJournal of physics. Condensed matter : an…
- 10 October 2007
It turns out that cut spheres, in common with spherocylinders and spheroids, pack more efficiently as the particle's aspect ratio is perturbed slightly from unity to reach a maximum density at an aspect ratio of approximately 1.25.
On contact numbers in random rod packings
Random packings of non-spherical granular particles are simulated by combining mechanical contraction and molecular dynamics, to determine contact numbers as a function of density. Particle shapes…
Cubic crystals from cubic colloids
We have studied the crystallization behavior of colloidal cubes by means of tunable depletion interactions. The colloidal system consists of novel micron-sized cubic particles prepared by silica…
Direct observation of ionic structure at solid-liquid interfaces: a deep look into the Stern Layer
This work has made use of recent advances in high-resolution Atomic Force Microscopy to reveal the ordered adsorption of the mono- and divalent ions that are common in natural environments to heterogeneous gibbsite/silica surfaces in contact with aqueous electrolytes.
The Synthesis and Magnetic Properties of Nanosized Hematite (α-Fe2O3) Particles
The synthesis of nanosized superparamagnetic hematite particles by dissolving ferric salts in hydrochloric acid and heating at 100°C is described. A hydrolysis reaction causes the formation of…
Magnetic Colloids from Magnetotactic Bacteria: Chain Formation and Colloidal Stability
Single-domain magnetite (Fe3O4) crystals, harvested from magnetotactic bacteria, display on transmission electron micrographs the cluster morphologies (folded chains, flux-closure rings) predicted…
Monodisperse magnetizable composite silica spheres with tunable dipolar interactions.
It is demonstrated that magnetic particles of maghemite and cobalt ferrite can be irreversibly attached to colloidal silica that is grafted with 3-mercaptopropyl(trimethoxy)silane to obtain stable dispersions of monodisperse colloidalsilica spheres.