Reversed micelle-entrapped colloidal

Reversed micelle-entrapped, colloidal CdS showed the characteristic weak fluorescence emission (Figure 2), previously observed in homogeneous solutions (16-19). However, the maximum emission intensity corresponded to full band gap emission (approximately 500 nm) and was not red-shifted as observed in homogeneous solution (17). This discrepancy might arise from the mode of prep>aration (H S instead of Na S), or from the specific effect of surfactant aggregates. 7 lternatively, tras can be the result of a size... 

To be active in H--production, a catalyst had to be incorporated in the system and depositecr on the semiconductor surface. Platinization was carried out by adding aqueous K PtCl solutions to the reversed micelle entrapped, colloidal CdS and irradfktingft by a 450 W Xenon lamp under Ar bubbling for 30 minutes. Platinization was monitored absorption spectrop ho to metrically. 

Meyer, M., Wallberg, C., Kurihara, K., and Fendler, J.H., Photosensitized charge separation and hydrogen production in reversed micelle entrapped platinized colloidal cadmium sulphide, /. Chem. Soc., Chem. Commun., 2, 90,1984. 

Meyer M, Wallberg C, Kurihara K, Fendler JH (1984) Photosensitized Charge Separation and Hydrogen-Production in Reversed Micelle Entrapped Platinized Colloidal Cadmium-Sulfide. J Chem Soc Chem Commim, pp 90-91... 

Aqueous pools of reversed micelles have been fruitfully employed for the in situ generation of semiconductor particles. The first publication in this area described the formation of CdS in sodium bis(2-ethylhexyl)sulfosuccinate (AOT) aggregates in isooctane [611]. The preparation involved the addition of aqueous CdCl or Cd(N03)2 to isooctane solutions of AOT. Exposure to controlled ammeters of the CdS particles formed. Irradiation of degassed, AOT-reversed-micelle-entrapped, platinized CdS by visible light (450-W Xenon lamp X > 350 nm) in the presence of thiophenol (PhSH) resulted in sustained hydrogen formation. Sacrificial electron transfer occurred from thiophenol to positive holes in the colloidal CdS and, consequently, diminished undesirable electron-hole recombinations (Fig. 101) [611]. 

Das, S., Mozumdar, S., and Maitra, A. (2000) Activity and conformation of yeast alcohol dehydrogenase (YADH) entrapped in reverse micelles. J. Colloid Interface Sci., 230, 328-333. 

---