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Bi-parametric data analysis

Combination of selected pairs of variables in two-dimensional (2D) diagrams enables a separation between different electroactive materials. This can be seen in Fig. 3.5, where a representation of (E3/4 -Ej/q) vs. (Eg j gj - Eonset) measured in [Pg.70]

This can be seen in Fig. 3.6, where square-wave voltammograms for synthetic pictorial specimens contain recommended dosages [177] of lead white, plus (a) casein and (b) sunflower oil. As depicted in Fig. 3.3, the response of the pristine pigment consisted of a unique peak at -0.56 V. The pictorial specimens [Pg.71]

The above voltammetric responses can be rationalized by assuming that the response of the grains of pristine pigments is superimposed to that of the ionomeric layer containing lead-binder compounds [178, 179]. For lead carbonate, this can be represented as [126, 177] [Pg.72]

In these equations, represents species confined in the ionomeric layer surrounding the grains of pigment. In the case of proteinaceous binders, Pb + ions are probably coordinated to any extent to donor sites of the binder, so that Eq. 3.3 should be replaced by [Pg.73]

Additionally, the ionomeric layer can form a barrier for charge diffusion surrounding the particles of pigment. As a result, the rate of the overall electrochemical process described by Eqs. 3.3, 3.4 and 3.5 is modified. Our data suggest that the peak at ca. -0.45 V is attributable to the reduction of free (Eq. 3.5) or binder-coordinated (Eq. 3.6) Pb + ions, while peaks at ca. -0.65 V must correspond to the reduction scheme described by Eqs. 3.3 and 3.4. [Pg.73]


See other pages where Bi-parametric data analysis is mentioned: [Pg.70]    [Pg.71]    [Pg.73]    [Pg.75]    [Pg.77]    [Pg.79]    [Pg.81]    [Pg.83]    [Pg.70]    [Pg.71]    [Pg.73]    [Pg.75]    [Pg.77]    [Pg.79]    [Pg.81]    [Pg.83]   
See also in sourсe #XX -- [ Pg.70 , Pg.71 , Pg.72 , Pg.73 , Pg.74 , Pg.75 , Pg.76 , Pg.77 , Pg.78 , Pg.79 , Pg.80 , Pg.81 , Pg.82 ]




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