Density-gradient sedimentation in silica sols. Anomalous shifts in the banding densities of polystyrene “latex” beads
- 1 February 1976
- journal article
- research article
- Published by Portland Press Ltd. in Biochemical Journal
- Vol. 153 (2) , 487-490
- https://doi.org/10.1042/bj1530487
Abstract
When polystyrene “latex” beads are centrifuged to equilibrium in gradients of Nalcoag 1030, Nalcoag 1034A and Ludox 130M, which are commercial formulations of colloidal silica, the beads at densities that may be markedly lower or higher than the bulk density. Addition to the gradient of small amounts of certain polymers restores the banding densities towards the expected value. These findings closely mimic previously observed “density shifts” of biological particles. A possible model for this anomalous behavior is discussed.This publication has 6 references indexed in Scilit:
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