LaMer plot

The introduction in 1993 of a high temperature preparation method using organic solvents constituted an important step towards the fabrication of monodisperse CdS, CdSe, and CdTe NCs.14 As demonstrated in classical studies by LaMer and Dinegar,43 the synthesis of monodisperse colloids via homogeneous nucleation requires a temporal separation of nucleation and growth of the seeds. The LaMer plot (Fig. 5.4) is very useful to illustrate the separation of nucleation and growth by means of a nucleation burst. 

Figure 5.4 LaMer plot depicting the degree of supersaturation as a function of reaction time.43 (Reprinted with permission from V. K. LaMer and R. H. Dinegar, J. Am. Chem. Soc. 1950, 72, 4847-4854. Copyright 1950 American Chemical Society.)...

Referring to the LaMer plot in Figure 6.16, explain what happens in each of the three stages. 

Figure 3.6 Growth mechanism of nanocrystals (LaMer plot) showing different stages of growth.

Sequenlial growth process 2rd solute actdilion LaMer plot... 

This occurs at the start of Stage III as described in the LaMer plot, where nucleation stops but S is still relatively high. At this stage, the size of many just-formed nuclei is only slightly larger than the critical radius r. These nuclei grow into particles by consuming free solute atoms and unstable clusters. On the other hand,... 

A plot of some typical activity coefficient ratios as a function of the square root of the concentration is shown in Fig. 1. The emf data for hydrochloric acid are from the work of Harned and Ehlers10 on cells of the type represented by equation (21). The mean activity coefficient ratios were computed by arbitrarily assuming that the most dilute solution, 0.003205 normal (which is the most nearly ideal) has the activity coefficient of unity. It will be observed that as the concentration increases the mean activity coefficient, on this arbitrary basis, steadily decreases whereas, if the ions were perfect solutes the activity coefficient ratios would be unity throughout the concentration range. The shift of activity coefficient ratios in the range of concentration included in this plot is roughly typical of the behavior of uni-univalent electrolytes. Fig. 1 also shows the activity coefficient ratios of zinc sulphate from the work of Cowperthwaite and LaMer,11 based on emf measurements at 25°, of the cell... 

---