Abstract
The hydrodynamic properties of a suspension of cellulose crystallites in 0.01 M phosphate buffer were studied by a combination of flow birefringence, viscosity, and light-scattering techniques. The hydrodynamic behavior of the crystallites in this medium was typical of polydisperse oblate ellipsoids. Since the individual crystallites are rodlike in shape it was concluded that a side-by-side aggregate had occured in the presence of buffer to form a diselike aggregate. Electron microscope observations supported this conclusion. The weight-average molecular weight of the aggregates was 200 millions, the diameter of the disc about 5000 A, and the thickness 15 to 30 A. Ultracentrifugal analysis yielded a very narrow distribution of sedimentation constants which reflects the uniformity in thickness of the aggregates.
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