By Sun Keping and Yu Gefei (Eds.)
Read Online or Download Recent Developments in Applied Electrostatics. Proceedings of the Fifth International Conference on Applied Electrostatics November 2~5, 2004, Shanghai, China PDF
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Additional resources for Recent Developments in Applied Electrostatics. Proceedings of the Fifth International Conference on Applied Electrostatics November 2~5, 2004, Shanghai, China
Example text
When diffusion is neglected only one boundary condition is required for p and n" p = O on the wire surface and n=O on the ground plane. Both components of the velocity vector are equal to zero on the cylinder and plate surfaces. After substitution of (3) and (4) into the charge conservation equations and neglecting the ion diffusion, the following equations for the transport of positive and negative ions can be derived: "r + KVp. _nn_ K V n . E - Kn p - n = kD c _ kR p n i)t e (8) The number of different parameters affecting the solution can be substantially reduced, if these equations are expressed in the dimensionless form.
104 F, V: Vibrating reed electrometer Fig. 1 Schematic illustration of triboelectrification apparatus RESULS AND DISCUSSIONS The values of Q(n) were observed at about 20 ~ and 65 %RH for FEP and Nylon 12 as a function of the number of rubbings of the carrier brush under various electrical conditions. The observed results were shown in Figure 2 (a) for FEP and 2 (b) for Nylon 12, respectively. As clearly shown in these figures, Figure 2 Tribocharging curves (a) for FEP and (b) for Nylon 12 the electrical condition of the charging brush drastically affects the tribocharges.
In these cases, a resistor equivalent to an electrometer or appropriate capacitor is connected from the metal electrode to ground. In the cascade method [9], which is frequently used recently, metallic beads sliding down on a surface of sample materials are electrically isolated. Previously, one of the authors reported contact charges between carriers for copiers and compacted quasi-toners under different electrical conditions [10]. In this charging system, surface voltages of samples were measured instead of tribocharges as a function of the number of contacts.