Nonionic rodlike micelles in dilute and semidilute solutions: intermicellar interaction and the scaling law

holes from the valence-band edge to the reducing agent in solution as is shown in Figure 10a. Without propane in solution, of course, the photogenerated holes will attack solvents directly. Smaller CD factors for alkanes other than propane can be explained by their lower hole-capture cross sections or smaller overlap of their fluctuating energy levels with Ti02 conduction-band edge. It seems to be of interest to compare the results in this acid solvent with those in fluorosulfonic acid (HS03F), one of the superacids. In the latter solvent, alkanes are known to be oxidized at a diffusion-controlled rate on Pt at less anodic potential than the potential where solvent oxidation starts.26,27 Therefore, the oxidation of alkanes in place of solvent oxidation is an exothermic reaction here. In addition, the oxidation is believed to involve the formation of an alkane radical which has a highly reducing ability. However, increase of photocurrents and any visually appreciable change were not found on the n-Ti02 before and after the solvent was purged with methane, ethane, or propane.28 This may imply no occurrence of an exothermic reaction in the superacid in accord with the result in triflic acid monohydrate. A final problem to be discussed is a cause for a sizable anodic current flow, not associated with alkane oxidation, on the re-