Nanotechnology-Enabled Sensors

244 Chapter 5: Characterization Techniques for Nanomaterials
Fig. 5.25 Top: The hierarchical self-assembled six-membered ring supermacrocycle
(rosette) on the left and the resulting nanotube stack on the right. Bottom: DLS
regularization diagrams of the nanotube, measured in solution at different concentrations.
Reprinted with permission from the American Chemical Society publications.
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In another example shown in Fig. 5.26, the advantage of DLS over other
particle size determination techniques is highlighted. 61 Here, time-dependent
DLS was performed on a crystallizing solution to study the growth of
CaCO3 crystallites. After 20 minutes the particle size distribution shows
particles with dimensions well in excess of the micron range. With time,
peak broadening becomes prevalent, as this represents the increasing
polydispersity of the particle sizes during their nucleation and growth
processes. 61
Fig. 5.26 Time dependence particle size distributions of CaCO3 crystals from dynamic
light scattering measurement. Reprinted with permission from the Wiley InterScience
publications. 61