Corrected intensity distributions SAXS

Figure 8. The corrected intensity distributions divided by the respective concentration from SAXS measurements (original data in inset, including background) for solutions of 57Tri07H with increasing concentration.

Sections 4.1 and 4.2 introduced nucleation by reviewing CNT. Section 4.3 discussed observation of nano-nucleation by means of SAXS.The correct size distribution f(N, t) and 2D shape (kinetic parameters) of a nano-nucleus are obtained simultaneously by analyzing SAXS intensity Ix(q, t) using the extended Guinier plot method. f N, t) is shown to decrease with the increase of N for each t. f(N, i) increases with the increase of t and saturates for each N. With the increase of t,f(N, t)... 

Ifre size of the micelles could also be obtained by SAXS measurements. The background corrected and desmeared intensity distributions are depicted in Figure S. The intensity is divided by die respective concentration, all curves show the same behavior. Each dace can be approximated by either the Omstein-Zemicke fimction (eq 3, Figure 9) or a core-shell structure of spheres (eq 4). The correlation length and the radii Ri (core) and R2 (shell) were determined for several concentrations close to c (Table II). 

The scattering data thus corrected are solely due to the radial excess electron density of the particles. Fig. 14 displays the measured intensity (filled circles) of the polystyrene latex discussed in conjunction with Fig. 10. The solid line is the fit of the experimental data by a core-shell model and a slightly asymmetric size distribution ([46] see below) taken from the analysis by ultracentrifugation [87]. In terms of a Gaussian size distribution the polydispersity corresponds to a standard deviation of 4.2%. The thin shell having a higher electron density stems from the adsorbed surfactant used in the synthesis of the latex. This effect and its detection by SAXS will be discussed further below (see Sect. 4.4). 

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