in the present model , a well-known condition necessary for the occurrence of self-sustained oscillations , i.e. , the presence of a positive feedback process far from equilibrium , is taken into account in a set of kinetic equations to describe simplified characters of the following two processes : ( i ) a cooperative formation of ion pair complexes at the interface , and ( ii ) supply of picrate anions and cetyltrimethylammonium cations to the interface accompanied by release of ion pair complexes to the organic phase .
C0021966
i
C0003075
anions