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Electrostatic charging and charge transport by hydrated amorphous silica under a high voltage direct current electrical field
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Image of FIG. 1.
FIG. 1.

Upper: Schematic representation of the system assembled for studies in an electrical field. Lower: a representation of the light-scattering cell.

Image of FIG. 2.
FIG. 2.

Curves as functions of the intensity of electrical field: (a) current x EF; (b) light-scattering x EF; (c) normalized current x EF; (d) normalized light-scattering intensity x EF.

Image of FIG. 3.
FIG. 3.

Difference between normalized electrical current x EF and normalized scattered intensity x EF curves, from data of Fig. 2.

Image of FIG. 4.
FIG. 4.

Electrical current vs. time: (a) constant humidity and (b) slow dehydration of the hydrated silica by dry air flow (1 L min−1), under constant electrical field (375 V mm−1).

Image of FIG. 5.
FIG. 5.

Averaged curves and kinetics of dehydration of silica samples during dehydration with a flow of dry air (1 L min.−1, 298 ± 1 K) under constant electrical field: (a) SG1; (b) SG2, and (c) SG3. The electrical current peaks correspond to the capacitive current, characteristic of the shifting of the electrodes after the weighing of the system (cell + silica).

Image of FIG. 6.
FIG. 6.

Correlation curves between the relative humidity inside the cell and the current for silica samples. These experiments were started with the samples hydrated to equilibrium (RH = 74% and T = 298 K).

Image of FIG. 7.
FIG. 7.

Curves of light-scattering intensity and current as functions of the dehydration time, under constant electrical field and dry air flow (375 V mm−1 and 1 L min−1): (a) SG1; (b) SG2, and (c) SG3.

Image of FIG. 8.
FIG. 8.

Model used to estimate van der Waals and capillary forces. Conditions: R = Xm/ 2; ϕ ∼ 0; r2 ≫ r1; DR.

Image of FIG. 9.
FIG. 9.

Schematic representation of the three steps suggested for the charge transport process with hydrated sílicas.


Generic image for table
Table I.

Surface properties of the silica gel samples obtained by nitrogen adsorption curves using BET (Brunauer, Emmett and Teller) theory and TGA.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electrostatic charging and charge transport by hydrated amorphous silica under a high voltage direct current electrical field