Method for determining electrode zone
An electrode and area technology, used in the field of determining electrode areas, can solve problems such as expensive and unreliable
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example 1
[0044] A polysulfone base film having a thickness of 150 µm and pores of 0.2 µm to 0.5 µm was immersed in a solution of 1 wt % gelatin in water. Wipe off excess liquid from the outside of the substrate and dry the substrate in a drying oven to remove moisture. The substrate was then compressed with a pressure of 100 MPa, thereby forming an annular compressed region on the substrate. The annular region has an inner diameter of 8 mm and an outer diameter of 10 mm.
[0045] 10 µl of an aqueous stain (rose bengal) solution was dropped on the substrate inside the ring. The stain solution can be seen spreading to the inside edge of the compression ring and then stops spreading. After about 1 hour, no stain is visible outside the annular area defined by the compression ring, at which point the water in the stain solution has evaporated.
example 2
[0049] Same as Example 1 except that about 60 nm of platinum was used as the electrode to coat the substrate. Alternatively, a solution containing ferrocyanide and ferricyanide was used instead of the stain solution to be dripped onto the substrate, a voltage was applied to the platinum electrode and the current was recorded. After the initial higher current, the current stabilized for about 10 minutes, after which time the substrate began to dry out and lose conductivity. A steady current indicates that no solution spreads outside the defined area.
example 3
[0053] Same as Example 2 except that a polyvinylidene fluoride substrate with a pore size of approximately 0.2 μm is used.
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