Metal Oxide Surfaces and Their Interactions with Aqueous Solutions and Microbial Organisms

Brown, Gordon E.; Henrich, Victor E.; Casey, William H.; Clark, David L.; Eggleston, Carrick M.; Felmy, Andrew R.; Goodman, D. W.; Grätzel, Michaël; Maciel, Gary E.; McCarthy, Maureen I.; Nealson, Kenneth H.; Sverjensky, Dimitri A.; Toney, Michael F.; Zachara, John M.

doi:10.1021/cr980011z

Cited by 1,001 publications

(883 citation statements)

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“…At the same time, this also indicated that the reactive velocity of reaction (3) was neither much slower (as MgO 2 ) nor much faster (as BaO 2 ) than that of reaction (2) for CaO 2 . The exhibited disciplinarian from MgO 2 to CaO 2 to BaO 2 might rest with the metal and crystal lattice properties of the alkaline-earth metal peroxides as metal oxides (36), which needs further investigation in the future.…”

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confidence: 99%

Study on the generation mechanism of reactive oxygen species on calcium peroxide by chemiluminescence and UV‐visible spectra

Zhang

Zhao

et al. 2007

Luminescence

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In the present work, the generation mechanism of reactive oxygen species (ROS) on calcium peroxide (CaO 2 ) was studied. A very intense chemiluminescence (CL) signal was observed when adding an aqueous solution of luminol or 2-methyl-6-(4-methoxyphenyl)-3,7-dihydroimidazo[1,2α]-pyrazin-3-one hydrochloride (MCLA) to a suspension of CaO 2 . The ROS released on CaO 2 were thought to be oxidizing agents leading to CL, and were characterized by CL, UV-visible (UV-vis) spectra and the effective scavengers of the special ROS. ( 1 O 2 ) in the process. Obviously, the release of the ROS on CaO 2 is the main factor that contributed to the effect of CaO 2 , but the details have not been clarified and needed further research.Chemiluminescence (CL) is a powerful analytical technique that has excellent sensitivity, and a wide linear dynamic range and requires relatively simple and inexpensive instrumentation. Furthermore, CL is an effective method in research on ROS, because of the associated instantaneous nature of CL and the short lifetime of ROS radicals (11-16). Goto et al. (17) successfully investigated the CL mechanism of the alkalineearth metal peroxides (MgO 2 , BaO 2 ) with CL reagents (luminol and lucigenin), and demonstrated that the hydroxyl ( • OH) and • O 2 − were released chiefly on the MgO 2 and BaO 2 , respectively, with CL. According to our literature search, corresponding reports about CaO 2 have not so far been made.

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confidence: 99%

Study on the generation mechanism of reactive oxygen species on calcium peroxide by chemiluminescence and UV‐visible spectra

Zhang

Zhao

et al. 2007

Luminescence

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“…Because the dimensions of nanomaterials are only a fraction of the space charge layer thickness in solid materials, screening effects from electrolytes and specifically adsorbed ions are dominant. For pure water, the most important ions are hydroxide and hydronium ions, and their effect on metal oxides, including TiO 2 [106] and Fe 2 O 3 [107,108] gives rise to the well-known 59 mV pH À1 variation of the flatband potential with the solution pH [109]. In surface water, phosphate, silicate, and fluoride ions are often strongly adsorbing [110], which determines the redox stability of many minerals [109].…”

Section: Multiple Exciton Generationmentioning

confidence: 99%

“…For pure water, the most important ions are hydroxide and hydronium ions, and their effect on metal oxides, including TiO 2 [106] and Fe 2 O 3 [107,108] gives rise to the well-known 59 mV pH À1 variation of the flatband potential with the solution pH [109]. In surface water, phosphate, silicate, and fluoride ions are often strongly adsorbing [110], which determines the redox stability of many minerals [109]. In contrast, the flatband potentials of II/VI, III/V, and group IV semiconductors are more susceptible to adsorption of soft ligands, including sulfur [111], HS À [112,113], HTe À [114,115], and Cl À [116].…”

Section: Multiple Exciton Generationmentioning

confidence: 99%

“…In the literature, proton adsorption is usually considered as an effect on the chemical potential μ. This leads to the known Nernstian dependence of the semiconductor flatband potential on solution [106,107,109]. Equation (5) works because redox reactions with protons are fast, allowing the protons to be in electrochemical equilibrium with the electrons in the particle.…”

Section: Multiple Exciton Generationmentioning

confidence: 99%

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Nanoscale Effects in Water Splitting Photocatalysis

Osterloh

2015

Topics in Current Chemistry

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From a conceptual standpoint, the water photoelectrolysis reaction is the simplest way to convert solar energy into fuel. It is widely believed that nanostructured photocatalysts can improve the efficiency of the process and lower the costs. Indeed, nanostructured light absorbers have several advantages over traditional materials. This includes shorter charge transport pathways and larger redox active surface areas. It is also possible to adjust the energetics of small particles via the quantum size effect or with adsorbed ions. At the same time, nanostructured absorbers have significant disadvantages over conventional ones. The larger surface area promotes defect recombination and reduces the photovoltage that can be drawn from the absorber. The smaller size of the particles also makes electron-hole separation more difficult to achieve. This chapter discusses these issues using selected examples from the literature and from the laboratory of the author.

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“…The development of mesoporous membrane type film with large surface areas prepared from nanosized colloidal semiconductor dispersion caused a remarkable growth in the field (Brown Jr. et al 1999). Dye sensitization of nanostructured wide band-gap semiconductors has led to an extension of their photoresponse into the visible region and to efficient conversion of solar energy into electricity in photoelectrochemical devices (O'Reagan & Grätzel 1991).…”

Section: Solar Cellsmentioning

confidence: 99%

Supramolecular photochemistry and solar cells

Iha

2000

An. Acad. Bras. Ciênc.

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Supramolecular photochemistry as well as solar cells are fascinating topics of current interest in Inorganic Photochemistry and very active research fields which have attracted wide attention in last two decades. A brief outline of the investigations in these fields carried out in our Laboratory of Inorganic Photochemistry and Energy Conversion is given here with no attempt of an exhaustive coverage of the literature. The emphasis is placed on recent work and information on the above mentioned subjects. Three types of supramolecular systems have been the focus of this work: (i) cage-type coordination compounds; (ii) second-sphere coordination compounds, exemplified by ion-pair photochemistry of cobalt complexes and (iii) covalently-linked systems. In the latter, modulation of the photoluminescence and photochemistry of some rhenium complexes are discussed. Solar energy conversion and development of thin-layer photoelectrochemical solar cells based on sensitization of nanocrystalline semiconductor films by some ruthenium polypyridyl complexes are presented as an important application that resulted from specifically engineered artificial assemblies.

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Metal Oxide Surfaces and Their Interactions with Aqueous Solutions and Microbial Organisms

Abstract: previously he was at Sandia National Laboratories. His research concerns the energetics and kinetics of the reactions between minerals and aqueous solutions, and in recent work, he has determined rate coefficients for dissociation of Al−O bonds in various dissolved aluminum complexes.

Cited by 1,001 publications

References 702 publications

Study on the generation mechanism of reactive oxygen species on calcium peroxide by chemiluminescence and UV‐visible spectra

Study on the generation mechanism of reactive oxygen species on calcium peroxide by chemiluminescence and UV‐visible spectra

Nanoscale Effects in Water Splitting Photocatalysis

Supramolecular photochemistry and solar cells

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