Tumbling, colloid particles

For B < 1, no stationary solution exists, and the vesicle shows a tumbling motion, very similar to a solid rod-like colloidal particle in shear flow. 

Experimentally, tire hard-sphere phase transition was observed using non-aqueous polymer lattices [79, 80]. Samples are prepared, brought into the fluid state by tumbling and tlien left to stand. Depending on particle size and concentration, colloidal crystals tlien fonn on a time scale from minutes to days. Experimentally, tliere is always some uncertainty in the actual volume fraction. Often tire concentrations are tlierefore rescaled so freezing occurs at ( )p = 0.49. The widtli of tire coexistence region agrees well witli simulations [Jd, 80]. 

For molecules adsorbed on colloidal metals, the tumbling motion of the metal particles can be rapid enough to average out the chemical shift anisotropy so that the lines are narrow enough for a simple liquids NMR experiment. Using this method, the resonance has been observed in colloidal solutions of Pd and Pt particles (see Sections IV.C and IV.D). 

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