Saturday, July 02, 2005

CURRENT DENSITY

In conjunction with our idea to grow pores laterally, we decided to see the effects of current density during the anodization process. What would happen, if we used a cathode, such as a stainless steel wire for example, with a notably small surface area, on a much larger aluminum surface? Since the wire would be aimed at one end of the membrane, there would be a difference in current density across the membrane. In effect, since the current applied over the sample will be nonuniform, we would predict that pore size and density would demonstrate similar variation. Of course, it is not as if the current will be randomly uneven across the sample. As the distance from the wire increases, the current should then effectively decrease. So, in theory, we should see a continuous drop in pore size and density as the distance from the wire increases. This type of concept can be very useful in potentially controlling pore sizes across a piece of aluminum. With control, it can open the door to creating more variation of wires within the same sample of aluminum.

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