Rotating cone electrode

Besides the RDE and DME, other uniformly accessible electrodes under laminar flow have been described. They include the rotating hemispherical and rotating cone electrodes, which were developed to obviate the problem of trapped gas bubbles at the centre of an RDE their use is not widespread. 

A solution to this problem is to use a rotating cone electrode (RConeE). It turns out that RCone electrodes are similar to RDE in that they act as uniformly accessible surfaces, producing a uniform rate of mass transport to all parts of the electrode surface. For a cone having an opening angle of 0, the current density is given by... 

Other Unusual Electrode Shapes. Various modifications of the rotating disk electrode are described in the literature. For example, the rotating disk electrode with ring sometimes suffers from bubbles that collect in the cotter and make it difficult to determine the fraction of the disk available for electrode reactions. One remedy is to use a cone-shaped electrode the ring is on the side of the cote and the disk at the tip. Bubbles don t like tips and skelter. 

CO = rotation speed (rad s-1) Vf = volume flow rate (cm3 s 1 ) rT = radius of wall-tube U = linear velocity of solution (cm s 1 ) 0 = angle between cone surface and rotation axis x = length of tubular/channel electrode w = width of channel electrode d — width of channel h = half-height of channel co = rotation speed of solution (rad s 1) co" = rotation speed of rotating disc (rad s-1). 

The disc system consisted of a truncated cone with a small base angle, the cross section of which generated the flow under investigation. It was made of an insulating material (Plexiglass) and equipped, in the disc plane, with a small circular electrode ( = 80j m) located at r = 2.7 cm from the rotation axis. The external disc radius was equal to 3 cm. 

Figure 4.9 Different types of collectors used in electrospinning (a) flat plate collector (KIdoaki et al. 2005) (6) rotating drum (Wannatong et al. 2004), mandrel (Mo and Weber 2004), rotating disc (Zussman et al. 2003) (c) rectangular, triangular, or wire cylinder frame (Katta et al. 2004) (d) electrode pair arrangements (Li, D., et al. 2003b) (e) single or multiple ring electrodes (Dalton et al. 2005) (f) mesh electrode (U.S. patent 6,110,590, Aug. 2000) (g) pair of cone-shaped collectors (Bunyan et al. 2006).

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