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Schematically viewing, this DOPH-membrane is put into a gap between a chamber at low ion concentration ( left side in this case ) and a chamber at high ion concentration ( right ).
Then, letting the exit of the left side be filled with oil drop.
As oil drop behaves as an insulator to ion, even if ions are moved from the side at high ion concentration, those ions are accumulated on the hole due to the oil drop as a wall for interception.
Potassium ions slightly are passed through the membrane at this state, so that, the same as a bio-membrane, its membranous electric potential gets to −100 mV on the side at high potassium ion.
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