Timothy Droubay | Environmental Molecular Sciences Laboratory

Epitaxial Growth and Properties of Magnetically Doped ZnO Prepared by Pulsed Laser Deposition of Nanoparticle Targets

Lead Institution

University of Washington

Principal Investigator

Daniel Gamelin

Project type

Large-Scale EMSL Research

Semiconductor spintronics has the potential to create entirely new paradigms for analog and digital electronics which may have a significant impact on energy consumption and efficiency. However, in…

Nanocomposite magnets for energy applications: exploring hard phase/soft phase interfacial properties

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Jun Cui

Project type

Exploratory Research

Exchange-spring magnets are nanocomposites that are composed of magnetically hard and soft phases that interact by magnetic exchange coupling. By theory, a composite magnet with ideal nanostructure,…

Model epitaxial heterostructures for water electrolysis

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Scott Chambers

This proposal focuses on the design, fabrication and evaluation of structurally and compositionally well-defined complex oxide heterostructures that can facilitate the harvesting of visible sunlight,…

Real-time FTIR measurements of Fe-oxide transformation in presence of dissimilatory Fe-reducing bacteria

Lead Institution

Montana State University

Principal Investigator

Gill Geesey

Project type

Large-Scale EMSL Research

The research will determine the nature, sequence and rates of formation of secondary Fe-oxides at a primary Fe-oxide surface colonized by dissimilatory Fe-reducing bacteria under a controlled…

Electronic and Optical Properties of Doped Complex Oxide Epitaxial Films and Interfaces

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Scott Chambers

Project type

Large-Scale EMSL Research

The effect of A-cation site and anion-site doping, as well as heteroepitaxial interface formation, on the electronic and optical properties of La-based perovskites will be investigated. Specimens…

Fundamental Structure-Property Relationships Governing the Electrochemical Activity of Epitaxial Heterostructures

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Scott Chambers

Complex oxides have the widest range of properties of any class of materials explored to date. However, with many degrees of freedom come many possible outcomes. Consequently, controlled synthesis of…

Specificity of Shewanella oneidensis outer membrane cytochromes
OmcA and OmcB towards iron- and manganese-oxide surfaces

Lead Institution

The Ohio State University

Principal Investigator

Brian Lower

Project type

Large-Scale EMSL Research

Metal-reducing bacteria have a unique ability to reduce solid-phase iron- and manganese- oxides in anaerobic environments. Unlike oxygen, Fe and Mn oxides, in a solid form, cannot diffuse across the…

Probing into the similarities of grain boundary atomic structures across various materials systems

Lead Institution

University of Liverpool

Principal Investigator

Nigel Browning

Project type

Limited Scope

To accelerate the fundamental understanding of interface and grain boundary structures which have been known to have great influences on various mechanical and electrical properties, we propose to…

Deposition of Metal-Doped Oxides for Spintronic Applications

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Tiffany Kaspar

Project type

Exploratory Research

For spintronic devices such as spin-FETs, efficient injection of spin-polarized electrons into a semiconductor material is necessary. For devices compatible with current semiconductor technology,…

Spin Electronic Phenomena in Magnetically Doped Perovskites and Complex Oxide Interfaces

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Scott Chambers

Project type

Large-Scale EMSL Research

Semiconductor spintronics has the potential to create entirely new paradigms for analog and digital electronics which may have a significant impact on energy consumption and efficiency. However,…

Directed Mesoscale Synthesis of Tunnel Structured Materials for Energy Applications

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Eugene Ilton

Many materials for energy applications function by reversibly absorbing and releasing charge carriers. Conventional synthesis of these materials typically results in complex aggregates of nano-scale…

Influence of Calcium Carbonate Coatings on Contaminant Reactivity

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Timothy Droubay

Project type

Exploratory Research

Determine the effects of carbonate coatings on electron transfer reactions responsible for the reduction of chromate with iron oxides. This program utilizes the following methods or techniques:1)…

Role of Microenvironments and Transition Zones in Subsurface Reactive Contaminant Transport

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James McKinley

This is a renewal proposal for a previous collaborative effort between the PNNL Scientific Focus Area (SFA) and EMSL. The research proposed will resolve critical Hanford and basic subsurface science…

Reductive Transformation of Iron Oxides: Coupled Solution and Solid-State Pathways

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Kevin Rosso

Project type

Large-Scale EMSL Research

Reductive transformation of Fe(III)-oxides such as &#61537; Fe2O3 (hematite) by aqueous dissolution / re precipitation is a central part of the natural biogeochemical iron cycle in the…

Electronic and optical properties modification of complex oxide epitaxial films and superlattices for efficient light harvesting

Lead Institution

Drexel University

Principal Investigator

Steven May

Project type

Large-Scale EMSL Research

We propose an aggressive program of epitaxial film synthesis, detailed and definitive materials characterization, optical and electronic properties measurements and ab initio simulations with the…

Advances in Understanding Electron Transfer Kinetics at Environmental Interfaces

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Kevin Rosso

Project type

Large-Scale EMSL Research

This EMSL user proposal requests a continuation of EMSL access for a BER funded Environmental Molecular Sciences Institute (EMSI) project led by Dr. Rosso at PNNL. This project constitutes the PNNL…

Improving magnetoelectric coupling in novel single-phase multiferroic thin films of the MTiO3
(M = Fe, Mn, Ni, …) family

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Tamas Varga

Multiferroics exhibit simultaneous electric and magnetic order. They are receiving increasing attention due to the fact that they show promise for the design of new multifunctional devices where…

Determining Mechanisms of Nonlinear Photo Response and Transport Properties in Scintillating Materials

Lead Institution

Oak Ridge National Laboratory

Principal Investigator

Yanwen Zhang

The objective of this proposed work is to develop fundamental understanding on photo response and charge carrier transport properties in advanced scintillating materials: (1) light output as a…

Directed Mesoscale Synthesis of Tunnel Structured Materials for Energy Applications

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Eugene Ilton

Many materials for energy applications function by reversibly absorbing and releasing charge carriers. Conventional synthesis of these materials typically results in complex aggregates of nano-scale…

Surface and interface study of contacts to carbon-based films

Lead Institution

Carnegie Mellon University

Principal Investigator

Lisa Porter

Project type

Exploratory Research

The proposed research consists of two projects, each of which pertains to different materials for electronic applications. The first project is part of a Nanoscale Interdisciplinary Research Team …

Material Interface Optimization in ETA-Photovoltaics

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Timothy Droubay

Project type

Exploratory Research

This project aims to provide a fundamental scientific foundation to understand the charge transport in novel oxide-based solar cells, and to tailor the transport by doping and/or interface…

Role of Microenvironments and Transition Zones in Subsurface Reactive Contaminant Transport

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James McKinley

This is a renewal proposal for a previous collaborative effort between the PNNL Scientific Focus Area (SFA) and EMSL. The research proposed will resolve critical Hanford and basic subsurface science…

Thrust 3,4: Molecular Forces in Bacterial Adhesion at the Oxide-Water Interface

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Michael Hochella

Project type

Grand Challenge

1) Influence of Fe(III) Oxide Particle Size on Organism/Oxide Interfacial Contact Area and Electron Transfer Rates. Dr. Hochella’s research group will investigate how the surface properties of…

Role of Microenvironments and Transition Zones in Subsurface Reactive Contaminant Transport

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James McKinley

Project type

Exploratory Research

The PNNL Scientific Focus Area (SFA) will resolve critical Hanford and basic subsurface science issues through integrated, multi-disciplinary, science-theme focused research on the role of…

Tuning the electronic and optical properties of complex oxide epitaxial films and superlattices for efficient visible light harvesting

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Scott Chambers

Project type

Large-Scale EMSL Research

We propose an aggressive program of epitaxial film synthesis, detailed and definitive materials characterization, optical and electronic properties measurements, and carefully coordinated ab initio…

Thrust Area I: Physiology of metal-reducing strains of Shewanella.

Lead Institution

University of Southern California

Principal Investigator

Kenneth Nealson

Project type

Grand Challenge

A multidisciplinary team of scientists is investigating the mechanisms of electron transfer from metal-reducing bacterial to Fe oxide surface as part of a PNNL/DOE-BER Grand Challenge in…

ETA-Photovoltaics materials Interface optimization

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Timothy Droubay

Project type

Large-Scale EMSL Research

We will provide a fundamental scientific foundation to understand the charge transport in novel oxide-based solar cells, and to tailor the transport by doping and/or interface modification of the…

Hydro-Biogeochemical Process Dynamics in the Groundwater-Surface Water Interaction Zone

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

This is a renewal proposal for a previous collaborative effort between the PNNL Scientific Focus Area (SFA) and EMSL.PNNL Scientific Focus Area. The PNNL SFA will develop a predictive understanding…

Thrust 4: Model Hematite Thin Films and Bacterial Iron Reduction (LDRD: Cytochrome and Whole Cell Interactions with Iron Oxides)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Timothy Droubay

Project type

Grand Challenge

This LDRD project is the fourth one associated with the Biogeochemistry Grand Challenge (BGC). Its overall goal is to develop new capabilities and materials as needed to understand the molecular…

Complex Oxide Heteroepitaxial Growth of Novel Electronic and Magnetic Heterostructures

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Scott Chambers

Project type

Large-Scale EMSL Research

Complex oxide heteroepitaxial growth of pure and magnetically doped perovskite films will be studied with the dual goals of: (i) enhancing understanding of the details of the growth process, and, (ii…

Improving magnetoelectric coupling in novel single-phase multiferroic thin films of the MTiO3
(M = Fe, Mn, Ni, …) family

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Tamas Varga

Multiferroics exhibit simultaneous electric and magnetic order. They are receiving increasing attention due to the fact that they show promise for the design of new multifunctional devices where…

Thrust area 4: How redox proteins on the exterior of the outer membrane of Shewanella accomplish interfacial electron transfer to the Fe(III) oxide surface.

Lead Institution

University of Wyoming

Principal Investigator

Carrick Eggleston

Project type

Grand Challenge

A multidisciplinary team of scientists is investigating the mechanisms of electron transfer from metal-reducing bacteria to Fe(III) oxide surfaces as part of a PNNL/DOE-BER Grand Challenge in…

Role of Microenvironments and Transition Zones in Field scale microbial ecology and biogeochemistry

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James McKinley

Project type

Exploratory Research

This is a renewal proposal for a previous collaborative effort between the PNNL Scientific Focus Area (SFA) and EMSL. The research proposed will resolve critical Hanford and basic subsurface science…

Hydro-Biogeochemical Process Dynamics in the Groundwater-Surface Water Interaction Zone

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

This is a renewal proposal for a previous collaborative effort between the PNNL Scientific Focus Area (SFA) and EMSL.PNNL Scientific Focus Area. The PNNL SFA will develop a predictive understanding…

Thrust area 1: The surface structure of Shewanella and the localization of outer membrane-associated proteins hypothesized to be involved in electron transfer from metal-reducing bacteria to metal oxide surfaces.

Lead Institution

University of Guelph

Principal Investigator

Terry Beveridge

Project type

Grand Challenge

A multidisciplinary team of scientists is investigating the mechanisms of electron transfer from metal-reducing bacterial to Fe oxide surface as part of a PNNL/DOE-BER Grand Challenge in…

Role of Microenvironments and Transition Zones in Field Scale Microbial Ecology and Biogeochemistry

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James McKinley

Project type

Limited Scope

This is a renewal proposal for a previous collaborative effort between the PNNL Scientific Focus Area (SFA) and EMSL. The research proposed will resolve critical Hanford and basic subsurface science…

Epitaxial oxide/oxide and oxide/semiconductor heterostructures for water electrolysis

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Scott Chambers

Project type

Large-Scale EMSL Research

This proposal focuses on the design, fabrication and evaluation of structurally and compositionally well-defined complex oxide heterostructures that can facilitate the harvesting of visible sunlight,…

Epitaxial Growth and Properties of Candidate Diluted Magnetic Oxide Semiconductors - Chemistry and Physics of Ceramic Surfaces (Scott Chambers' BES Project - 10122)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Scott Chambers

Project type

Exploratory Research

We propose to grow and characterize by MBE, MOCVD, and PLD doped transition metal oxide epitaxial films to assess suitability for potential use in spin electronics. We will use RHEED and XPS (in…

Modeling-Assisted Growth of New Multiferroics in the MTiO3 (M = Fe, Mn, Ni) Family as Epitaxial Thin Films

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Tamas Varga

Materials that simultaneously show electric and magnetic order are currently gaining increasing attention due to the fact that such multiferroics are promising materials for the design of new…

Investigating interactions and aggregate structures of boehmite particles toward understanding of bulk rheology

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Jaehun Chun

The aim of the proposed research is to understand unique particle interactions in tank waste relevant systems from chemical physics at solid-liquid interfaces, and to determine how those interactions…

Site Specific Valence Above and Below the Verwey Transition in Magnetite

Lead Institution

Argonne National Laboratory

Principal Investigator

Julie Cross

Project type

Exploratory Research

ABSTRACT: The Verwey transition has historically been described as an electron-ordering transition in a mixed-valent system that results in ordering of the formal valence states in the low…

The Role of Microenvironments and Physicochemical Subsurface Components on Field Scale Biogeochemistry and Contaminant Mobility

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James McKinley

Project type

Exploratory Research

This is a renewal proposal for a previous collaborative effort between the PNNL Scientific Focus Area (SFA) and EMSL. The research proposed will resolve critical Hanford and basic subsurface science…

Investigating interactions and aggregate structures of boehmite particles toward understanding of bulk rheology

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Jaehun Chun

The aim of the proposed research is to understand unique particle interactions in tank waste relevant systems from chemical physics at solid-liquid interfaces, and to determine how those interactions…

Projects