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Sieving of proteins in silica colloidal crystals of millimeter dimensions is characterized for particle diameters of nominally 350 and 500 nm, where the colloidal crystals are chemically modified with a brush layer of polyacrylamide. A model is developed that relates the reduced electrophoretic mobility to the experimentally measurable porosity. The model fits the data with no adjustable parameters...
Electrophoresis 2013, 34, pp. 753–760. DOI: 10.1002/elps.201200413
The process of colloidal crystal formation is captured in the center color image, where the silica particles exhibit an ordered arrangement in a concentrated slurry, as indicted by the red color from Bragg diffraction. The particles then condense into a solid colloidal crystal, as indicated by the Bragg diffraction shifting to the...
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