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Photoactivity of ternary lead-group IVB oxides for hydrogen and oxygen evolution (1990)

Kudo, Akihiko ; Steinberg, Menahem ; Bard, Allen J. ; [et al.]

Springer

Catalysis letters 5 (1990), S. 61-66

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ISSN: 1572-879X

Keywords: Photocatalysis ; photocatalytic activity ; PbCrO4 ; PbMoO4 ; PbWO4 ; hydrogen evolution ; oxygen evolution ; aqueous solutions ; ternary lead Group IVB oxides

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract The relative photocatalytic activity of a series of lead-IVB group oxides (PbCrO4, PbMoO4, and PbWO4) was studied for hydrogen evolution from aqueous methanol solution and for oxygen evolution from aqueous silver nitrate solution. Among the compounds, only PbMoO4 and platinized PbMoO4 powders acted as photocatalysts for oxygen and hydrogen evolution reactions from aqueous solutions, with an activity for oxygen evolution on PbMoO4 comparable to that observed on TiO2.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00772094

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Light scattering study of solubilization of organic molecules by block copolymer micelles in aqueous media (1995)

Tian, Minmin ; Arca, Emin ; Tuzar, Zdenek ; [et al.]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 1713-1722

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ISSN: 0887-6266

Keywords: block copolymers ; micelles ; solubilization ; light scattering ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: Block copolymers, when dissolved in a selective solvent, form spherical micelles. These micelles can selectively solubilize organic molecules otherwise insoluble in the pure solvent. In this study, we report solubilization of organic molecules by styrene-methacrylic acid block copolymer micelles in aqueous buffers. A light scattering technique was developed to determine the extent of micellar solubilization. Our results indicate that the extent of micellar solubilization depends on the chemical nature of organic molecules, specifically, on the interactions between the organic compound and polystyrene. A thermodynamic model has been developed to describe micellar solubilization. The theoretical calculation agrees reasonably well with the experimental results for two micellar samples examined. ©1995 John Wiley & Sons, Inc.

Additional Material: 1 Ill.