Andrew Stack

Oxidation of lead sulfide surfaces in the presence of phosphate: nanoparticle formation.

Lead Institution

Georgia Institute of Technology

Principal Investigator

Andrew Stack

Project type

Exploratory Research

The understanding of galena (PbS) oxidation in the presence of phosphate containing solutions is important because lead contaminated soils and mine wastes are often treated with phosphate as a…

Calculated Rates of Water-Exchange on Large Aqueous Aluminum Nanoclusters.

Lead Institution

University of California, Davis

Principal Investigator

William Casey

Project type

Capability Research

We request 75,000 processor hours on the EMSL supercomputer mpp2 in order to simulate the pathways for exchange of a bound water between the GaAl12 cluster and an aqueous solution. Specifically, we…

Oxygen versus Iron Terminations in Hematite Basal Surfaces: STM imagin in air and in aqueous solutions.

Lead Institution

Georgia Institute of Technology

Principal Investigator

Andrew Stack

Project type

Exploratory Research

This project will focus on determining the surface structure of hematite basal planes in aqueous solutions. Prior to this writing this proposal, we have been imaging hematite surfaces in solution…

Oxygen versus Iron Terminations in Hematite Basal Surfaces: STM imagin in air and in aqueous solutions.

Lead Institution

Georgia Institute of Technology

Principal Investigator

Andrew Stack

Project type

Exploratory Research

This project will focus on determining the surface structure of hematite basal planes in aqueous solutions. Prior to this writing this proposal, we have been imaging hematite surfaces in solution…

XPS characterization of hydroquinone-treated hematite

Lead Institution

University of Wyoming

Principal Investigator

Carrick Eggleston

Project type

Exploratory Research

We are studying the adsorption and reaction of hydroquinone with hematite mineral surfaces in connection with questions regarding biological electron transport for iron reducing bacteria. Our…

Quantitative prediction of kink site formation rate on calcite and barite using metadynamics.

Lead Institution

Georgia Institute of Technology

Principal Investigator

Andrew Stack

Project type

Exploratory Research

Quantitative kinetic models in geochemistry are often hindered by a lack of knowledge of likely reaction pathways. Furthermore, experimental data of mineral surface reactions is often ambiguous,…

Geometry Optimizations of Aqueous Aluminum Clusters (emsl3080)

Lead Institution

University of California, Davis

Principal Investigator

William Casey

Project type

Capability Research

Ab initio geometry optimizations are to be performed in the gas phase for several different aluminum polyoxocations, including the Al13, GaAl12, and GeAl12 keggin-like molecules, the delta-Al13…

EMSL Science Overview

Andrew Stack

Projects

Oxidation of lead sulfide surfaces in the presence of phosphate: nanoparticle formation.

Calculated Rates of Water-Exchange on Large Aqueous Aluminum Nanoclusters.

Oxygen versus Iron Terminations in Hematite Basal Surfaces: STM imagin in air and in aqueous solutions.

Oxygen versus Iron Terminations in Hematite Basal Surfaces: STM imagin in air and in aqueous solutions.

XPS characterization of hydroquinone-treated hematite

Quantitative prediction of kink site formation rate on calcite and barite using metadynamics.

Geometry Optimizations of Aqueous Aluminum Clusters (emsl3080)