The application of distance distribution functions to structural analysis of core–shell particles

Mykhaylyk, O.O.; Ryan, A.J.; Tzokova, N.; Williams, N.

doi:10.1107/S0021889807001616

Figure 3
Distance distribution functions obtained by indirect method from experimental SAXS patterns of PU/PMMA latex particles presented in the Fig. 2

(left-hand side column of the plots) and compared with those calculated for the model core–shell particles (R_c = 300 Å, R = 370 Å, ξ_c = 0.379 e Å⁻³ and ξ_s = 0.364 e Å⁻³) surrounded by different contrast media (right-hand side column of the plots). Figures on the plots indicate mass density (in g cm⁻³) of the corresponding sucrose solution. Both experimental and simulated sets of distance distribution functions have been normalized by the maximum value obtained in its own p(r) corresponding to the latex particles diluted in water (ρ_m ≃ 1.0 g cm⁻³). The distance distribution functions obtained from the experiment have been fitted with the equation of p(r) corresponding to the ensemble of core–shell particles with normal distribution of electron densities of both the core and the shell, equation (1)

(the obtained parameters are: R_c = 258 Å, R = 365 Å, ξ_c = 0.381 e Å⁻³, ξ_s = 0.366 e Å⁻³, σ_c = 0.017 e Å⁻³ and σ_s = 0.005 e Å⁻³). The model and the parameters are discussed later in the text.

JOURNAL OF
APPLIED
CRYSTALLOGRAPHY

ISSN: 1600-5767

Volume 40| Part s1| January 2007| Pages s506-s511

doi:10.1107/S0021889807001616

Search IUCr Journals		doi		Advanced search
Author		volume	page