The photocurrents derived from Ti02 suspensions are enhanced when reducible species such as Cu2+ and Fe3+ are added to cells containing these suspensions. This process is proposed to ocm via trapping of photogenerated electrons in the Ti02 by these solution species, thereby reducing the extent of deleterious electron-hole recombination. The ability of platinum deposita on Ti02 particles to part...

Photocatalytic oxidation of sodium salt of 2,6-dichloroindophenol (DCIP) in titanium dioxide aqueous suspension has been studied. DCIP is photocatalytically oxidized on the active Ti02 surface by the medium pres­ sure Hg lamp with pyrex sleeve radiation (A>280nm). The apparent integral quantum yield of the DCIP decomposition was determined. Photocatalytic decomposition of DCIP in aqueous suspen...

There have been contradictory results concerning the effect of doping Ti02 with Fe(II1) upon its photocatalytic activity. We believe that this is due to the method used in adding the Fe(1II) to Ti02. This paper addresses this issue by using a precise adsorption process for loading stable aqueous suspensions (sols) of Ti02 doped with Fe(1II). In this manner, we control the speciation of Fe(II1) ...

The densities of thirteen silicate liquids along the NaZSiOs-TiOz and CaSiOs-TiOZ joins and six other titanium-bung silicate liquids of the general formula X ;$,TiSiO, (where X = Li, Na, K, Rb, Cs, Ca, Sr, Ba) have been measured in equilibrium with air using the double Pt bob Archimedean method. The NazSiOj-TiOz join was investigated from lo-50 mole% Ti02 in the temperature range lOOOI 150°C wh...

htvb}+OH--'OHOrhlvb)+H2OT"'OH+Htq [5] These active species of oxygen as well as eand ht.b) would support a wide variety of Ti02 dependent photo-induced catalytic reactions, oxidation, oxidative cleavage, reduction, geometric and valence isomerization, substitution, condensation, and polymerizatien.i) We showed here that NOi is oxidized by・OH and reduced by e', producing NOi and NO, respectively...

Car cabin air quality monitoring can effectively he analysed using metal oxide semiconducting (MOS) gas sensors. In this paper, commercially available gas sensors are compared with fabricated Mo03-Ti02 and Moo3WO3 thin films. The laboratory tests showed that the Moo3 based sensors possessed comparable gas sensing properties. The Mo03(75%)-Ti02(25%) sensor has a response 74% higher relative to t...

Titanium and vanadium dioxide systems were selected to study the MOCVD process for the growth of oxide epitaxial films. Single-crystal Ti02 and V02 films in single and multilayered configurations have been successfully grown on sapphire (a-Al203) single-crystal substrates. Seven distinct epitaxial orientation relationships between the films and the substrates were observed. Discussion on these ...

Free radicals intermediates are formed on the surface of metal oxide semiconductors, namely Ti02 and Fe203, following the light-induced charge separation upon band-gap illu-mination. These radicals appear to adhere strongly to the ~.urfaces of the small colloidal particles (diameters between 5 and 20 nm) employed in this study. A second electron-transfer step yielding the observed end-products ...

htvb}+OH--'OHOrhlvb)+H2OT"'OH+Htq [5] These active species of oxygen as well as eand ht.b) would support a wide variety of Ti02 dependent photo-induced catalytic reactions, oxidation, oxidative cleavage, reduction, geometric and valence isomerization, substitution, condensation, and polymerizatien.i) We showed here that NOi is oxidized by・OH and reduced by e', producing NOi and NO, respectively...

Nanophase Ti02 particles, with typical particle sizes in the range of 20-50 nm, have been synthesized using a microemulsion-mediated process. In this process, the aqueous cores ofwater/TritonX-100/exanol/ cyclohexane microemulsions have been used as constrained microreactors for the precipitation of precursor titanium hydroxide. The hydroxide particles thus formed were separated, dried, and cal...