By John Texter
The topic of this quantity is restricted in that it addresses amphiphiles at liquid/air, liquid/liquid, and liquid/solid interfaces, with litte awareness paid to vapor/solid interfaces. This quantity will serve to summarize our present knowing of interfacial constitution on the molecular point in those structures, and the relation of this constitution to chemical and physicochemical phenomena.
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No change in the Voltapotential was observed in the absence of any component of the reaction . 1 and is inhibited in the acid and alkaline regions (Fig. 5). Inhibition of the electron transfer reaction in the acidic region is probably due to conversion of chlorophyll to pheophytin. Inhibition in the alkaline region may be due to the fact that at pH > 10 the carboxylic ring breaks and salts of chlorophilins are obtained since the complex ester bonds are simultaneously hydrolyzed . The observed Volta potential does not change at a sufficiently large buffer capacity of the solution (from 5 to 100 mM Tris-HCI) [47, 48].
The aqueous phase is to the left, the hexane phase is to the right, and the interface is located at z = 0 where N(O) is the fraction of the total number of vectors forming an angle 0 with the normal to the interface, sin 0 corrects for the Jacobian, and ( . . ) represents a statistical average. P(O)for butanol and hexanol are shown in Fig. 6. Both distributions are strongly non-uniform, and peak near 0 -- 180~ which corresponds to the end-to-end vector pointing towards hexane. The probability of finding this vector pointing towards water is quite small - an expected effect, considering the hydrophobic nature of the hydrocarbon chain.
The aqueous phase pH was chosen so that acidification of the boundary layer inactivated the chlorophyll due to its pheophytinization. As shown in Fig. 5, while in the buffered solution this effect is absent. From these results, it is clear that chlorophyll adsorbed at an interface can catalyze redox reactions between solutes in the two liquid phases, and these reactions are accompanied by injection of negative charges into the low dielectric membrane interior. Metallo-comptexes of porphyrins also have similar catalytic properties at the oil/water interface without illumination [13, 14, 43].
Amphiphiles at Interfaces by John Texter