Jennifer L. Peper

Oxygen Atom Transfer Reactions of Colloidal Metal Oxide Nanoparticles

Justin L. Lee, Noreen E. Gentry, Jennifer L. Peper, S. Hetzel et autres

Redox transformations at metal oxide (MO x )/solution interfaces are broadly important, and oxygen atom transfer (OAT) is one of the simplest and most fundamental examples of such reactivity. OAT is a two-electron transfer process, well-known in gas/solid reactions and catalysis. However, …

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Trap States in Reduced Colloidal Titanium Dioxide Nanoparticles Have Different Proton Stoichiometries

Noreen E. Gentry, Noah J. Gibson, Justin L. Lee, Jennifer L. Peper et autres

High Resolution Image Download MS PowerPoint Slide Added electrons and holes in semiconducting (nano)materials typically occupy “trap states,” which often determine their photophysical properties and chemical reactivity. However, trap states are usually ill-defined, with few insights into their stoichiometry or structure. Our …

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Aqueous TiO2 Nanoparticles React by Proton-Coupled Electron Transfer

Jennifer L. Peper, Noreen E. Gentry, Benjamin Boudy, James M. Mayer

Redox reactions of aqueous colloidal TiO 2 4 nm nanoparticles (NPs) have been examined, including both citrate-capped and uncapped NPs ( c -TiO 2 and uc -TiO 2 ). Photoreduction gave stable blue colloidal c -TiO 2 R NPs with 10–60 electrons …

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Different Kinetic Reactivities of Electrons in Distinct TiO2 Nanoparticle Trap States

Jennifer L. Peper, Noreen E. Gentry, Anna C. Brezny, Mackenzie J. Field et autres

Electrons added to TiO 2 and other semiconductors often occupy trap states, whose reactivity can determine the catalytic and stoichiometric chemistry of the material. We previously showed that reduced aqueous colloidal TiO 2 nanoparticles have two distinct classes of thermally equilibrated trapped …

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Different Kinetic Reactivities of Electrons in Distinct TiO₂ Nanoparticle Trap States

Jennifer L. Peper, Noreen E. Gentry, Anna C. Brezny, Mackenzie J. Field et autres

Electrons added to TiO₂ and other semiconductors often occupy trap states, whose reactivity can determine the catalytic and stoichiometric chemistry of the material. We previously showed that reduced aqueous colloidal TiO₂ nanoparticles have two distinct classes of thermally equilibrated trapped electrons, termed …

Manifesto on the Thermochemistry of Nanoscale Redox Reactions for Energy Conversion

Jennifer L. Peper, James M. Mayer

Advancements in the use of nanoscale materials for energy conversions will rely on a clear understanding of reaction thermochemistry. While band edge and Fermi energies can be rigorous thermodynamic descriptors of bulk materials, we show here that their application to nanoscale systems …

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Slow Equilibration between Spectroscopically Distinct Trap States in Reduced TiO2 Nanoparticles

Jennifer L. Peper, David J. Vinyard, Gary W. Brudvig, James M. Mayer

Understanding the nature of charge carriers in nanoscale titanium dioxide is important for its use in solar energy conversion, photocatalysis, and other applications. UV-irradiation of aqueous, colloidal TiO 2 nanoparticles in the presence of methanol gives highly reduced suspensions. Two distinct types …

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Exploring the redox reaction chemistry of metal oxide nanoparticles

James M. Mayer, Carolyn N. Valdez, Miles N. Braten, Joel N. Schrauben et autres

Early title transfer of contaminated base closure property: Caveat emptor

Barry P. Steinberg, Jennifer L. Peper

Abstract This article discusses the recent enactment of Section 334 of the National Defense Authorization Act for Fiscal Year 1997, which amended Section 120(h)(3)(B) of the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) to allow the transfer by deed of contaminated …

Long‐term leases and the reuse of base closure property—The reaction of the courts and congress

Barry P. Steinberg, Jennifer L. Peper

Abstract The expeditious transfer and reuse of contaminated parcels of base closure property has been complicated by the requirements of Section 120(h)(3) of the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) that all remediation be completed or that a remedy be …