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Dive into the research topics where Melissa Marie Mills is active.

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Featured researches published by Melissa Marie Mills.


Scientific Reports | 2017

Model Representations of Kerogen Structures: An Insight from Density Functional Theory Calculations and Spectroscopic Measurements

Philippe F. Weck; Eunja Kim; Yifeng Wang; Jessica Nicole Kruichak; Melissa Marie Mills; Edward N. Matteo; Roland J.-M. Pellenq

Molecular structures of kerogen control hydrocarbon production in unconventional reservoirs. Significant progress has been made in developing model representations of various kerogen structures. These models have been widely used for the prediction of gas adsorption and migration in shale matrix. However, using density functional perturbation theory (DFPT) calculations and vibrational spectroscopic measurements, we here show that a large gap may still remain between the existing model representations and actual kerogen structures, therefore calling for new model development. Using DFPT, we calculated Fourier transform infrared (FTIR) spectra for six most widely used kerogen structure models. The computed spectra were then systematically compared to the FTIR absorption spectra collected for kerogen samples isolated from Mancos, Woodford and Marcellus formations representing a wide range of kerogen origin and maturation conditions. Limited agreement between the model predictions and the measurements highlights that the existing kerogen models may still miss some key features in structural representation. A combination of DFPT calculations with spectroscopic measurements may provide a useful diagnostic tool for assessing the adequacy of a proposed structural model as well as for future model development. This approach may eventually help develop comprehensive infrared (IR)-fingerprints for tracing kerogen evolution.


Journal of Environmental Radioactivity | 2015

Iodide uptake by negatively charged clay interlayers

Andrew Miller; Jessica Nicole Kruichak; Melissa Marie Mills; Yifeng Wang

Understanding iodide interactions with clay minerals is critical to quantifying risk associated with nuclear waste disposal. Current thought assumes that iodide does not interact directly with clay minerals due to electrical repulsion between the iodide and the negatively charged clay layers. However, a growing body of work indicates a weak interaction between iodide and clays. The goal of this contribution is to report a conceptual model for iodide interaction with clays by considering clay mineral structures and emergent behaviors of chemical species in confined spaces. To approach the problem, a suite of clay minerals was used with varying degrees of isomorphic substitution, chemical composition, and mineral structure. Iodide uptake experiments were completed with each of these minerals in a range of swamping electrolyte identities (NaCl, NaBr, KCl) and concentrations. Iodide uptake behaviors form distinct trends with cation exchange capacity and mineral structure. These trends change substantially with electrolyte composition and concentration, but do not appear to be affected by solution pH. The experimental results suggest that iodide may directly interact with clays by forming ion-pairs (e.g., NaI(aq)) which may concentrate within the interlayer space as well as the thin areas surrounding the clay particle where water behavior is more structured relative to bulk water. Ion pairing and iodide concentration in these zones is probably driven by the reduced dielectric constant of water in confined space and by the relatively high polarizability of the iodide species.


Rock Mechanics and Rock Engineering | 2015

Mechanical response and microprocesses of reconsolidating crushed salt at elevated temperature

Scott Thomas Broome; Stephen J. Bauer; F. D. Hansen; Melissa Marie Mills


Archive | 2018

Project Plan: Salt in Situ Heater Test.

Kristopher L Kuhlman; Melissa Marie Mills; Courtney Grant Herrick; Edward N. Matteo; Phil Stuaffer; Peter Johnson; Hakim Boukhalfa; Doug Weaver; Jonny Rutqvist; Yuxin Wu


Engineering Geology | 2018

Micromechanical processes in consolidated granular salt

Melissa Marie Mills; John C. Stormont; Stephen J. Bauer


Archive | 2017

Consensus on Intermediate Scale Salt Field Test Design

Kristopher L Kuhlman; Melissa Marie Mills; Edward N. Matteo


Archive | 2016

Fundamental Study of Disposition and Release of Methane in a Shale Gas Reservoir

Yifeng Wang; Yongliang Xiong; Louise J. Criscenti; Tuan Ahn Ho; Philippe F. Weck; Anastasia G. Ilgen; Edward N. Matteo; Jessica Nicole Kruichak; Melissa Marie Mills; Thomas A. Dewers; Margaret E. Gordon; Yucel Akkutlu


Archive | 2016

Investigation of the Thermal Effects on the Settling Behavior of Clay Mineral Particles.

Jessica Nicole Kruichak; Melissa Marie Mills; Clay Payne; Amanda Christine Sanchez; Edward N. Matteo; Yifeng Wang


Archive | 2015

Gas flow measurements through consolidating crushed salt.

Stephen J. Bauer; Francis D. Hansen; Scott Thomas Broome; Melissa Marie Mills; Brandon Lampe; John C. Stormont


Archive | 2015

Experimental Studies of Sorption Diffusion and Swelling in Clay Minerals.

Edward N. Matteo; Jessica Nicole Kruichak; Melissa Marie Mills; Clay Payne; Yifeng Wang

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Yifeng Wang

Sandia National Laboratories

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Edward N. Matteo

Sandia National Laboratories

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Andrew Miller

Sandia National Laboratories

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Hernesto Tellez

Sandia National Laboratories

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Stephen J. Bauer

Sandia National Laboratories

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Kristopher L Kuhlman

Sandia National Laboratories

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Philippe F. Weck

Sandia National Laboratories

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Scott Thomas Broome

Sandia National Laboratories

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