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Displaying 1 - 25 of 49

Solvent-Pore Interactions in the Easgle Ford Shale Formation

February 15, 2019
Author(s)
Victoria H. DiStefano, Joanna McFarlane, Andrew G. Stack, Edmund Perfect, David F. Mildner, Markus Bleuel, Steve J. Chipera, Kenneth C. Littrell, Michael C. Cheshire, Katherine E. Manz, Lawrence M Anovitz
The effect of solvent extraction on pore space was examined on a suite of samples from the Eagle Ford Shale Formation with varying lithologies and maturities. Several solvents were contacted with shales, extracting the compatible organic matter. The

Boehmite and Gibbsite Nanoplates for the Synthesis of Advanced Alumina Products

December 28, 2018
Author(s)
Xin Zhang, Patricia L. Huestis, Carolyn I. Pearce, Jian Zhi Hu, Katharine Page, Lawrence M Anovitz, Alexandr B. Aleksandrov, Micah P. Prange, Sebastien Kerisit, Mark E. Bowden, Wenwen Cui, Zheming Wang, Nicholas R. Jaegers, Trent R. Graham, Mateusz Dembowski, Hsiu-Wen Wang, Jue Liu, Alpha T. N'Diaye, Markus Bleuel, David F. Mildner, Thomas M. Orlando, Greg A. Kimmel, Jay A. La Verne, Sue B. Clark, Kevin M. Rosso
Boehmite (γ-AlOOH) and gibbsite (α-A;(OH) 3) are important archetype (oxy)hydroxides of aluminum in nature that also play diverse roles across a plethora of industrial applications. As a consequence, highly precise synthesis of these pure phases with

Effects of Ionic Strength, Salt, and pH on Aggregation of Boehmite Nanocrystals: Tumbler Small-Angle Neutron and X-ray Scattering and Imaging Analysis

December 26, 2018
Author(s)
L. M. Anovitz, X. Zhang, J. Soltis, E. Nakouzi, A. J. Krzysko, J. Chun, G. K. Schenter, T. R. Graham, K. M. Rosso, J. J. De Yoreo, A. G. Stack, Markus Bleuel, Cedric V. Gagnon, David F. Mildner, J. Ilavsky, I. Kuzmenko
The U.S. government currently spends significant resources annually managing the legacies of the Cold War, including 300 million liters of highly radioactive wastes stored in hundreds of tanks at the Hanford Site (WA) and the Savannah River Site (SC). The

Evaluation of Nanoscale Accessible Pore Structures for Improved Prediction of Gas Production Potential in Chinese Marine Shales

December 20, 2018
Author(s)
Yang Wang, Yong Qin, Rui Zhang, Lilin He, Lawrence M Anovitz, Markus Bleuel, David F. Mildner, Shimin Liu, Yanming Zhu
The lower Cambrian Niutiang and Lower Silurian Longmaxi shales in the Upper Yangtze Platform (UYP) are considered as the most promising strata for shale gas exploration in China. To shed light on the study of evaluation of nanoscale pore structure for

The Effects of Burial Diagenesis on Multiscale Porosity in the St. Peter Sandstone: An Imagine, Small-Angle, and Ultra-Small-Angle Neutron Scattering Analysis

November 4, 2017
Author(s)
Lawrence M. Anovitz, Jared T. Freiburg, Matthew J. Wasbrough, David F. Mildner, Kenneth C. Littrell, Vitaliy Pipich, Jan Ilavsky
To examine the effects of burial diagenesis on heirarchical pore structures in sandstone and compare those with the effects of overgrowth formation, we obtained samples of St. Peter Sandstone from drill cores obtained in the Illinois and Michigan Basins

Domain Formation in the Type-II/1 Superconductor Niobium: Interplay of Pinning, Geometry, and Attractive Vortex-Vortex Interaction

October 10, 2017
Author(s)
Tommy Reimann, Michael Schulz, David F. Mildner, Markus Bleuel, Annie Brulet, Ralph P. Harti, Georg Benka, Andreas Bauer, Peter Boni, Sebastian Muhlbauer
Vortex attraction which can cause a bundling of vortices has been observed in a multitude of type-II superconductors, While its underlying mechanisms have been extensively studied, the morphology of the emerging vortex superstructure has only been weakly

Chemical and Physical Changes During Seawater Flow through Intact Dunite Cores: An Experimental study at 150-200 degC

October 1, 2017
Author(s)
Andrew J. Luhmann, Benjamin M. Tutolo, Brian C. Bagley, David F. Mildner, Peter P. Scheuermann, Joshua M. Feinberg, Konstantin Ignatyev, Jr. Seyfried
Two flow-through experiments were conducted to assess serpentinization of intact dunite cores. Permeability and fluid chemistry indicate significantly more reaction during the second experiment at 200 °C than the first experiment at 150°C. Permeability

Determination of Closed Porosity in Rocks by Small-Angle Neuron Scattering

October 3, 2016
Author(s)
Jitendra Bahadur, Christian R. Medina, Lilin He, Yuri B. Melnichenko, John A. Rupp, Tomasz P. Blach, David F. Mildner
Small-angle neutron (SANS) and ultra small-angle neutron scattering (USANS) has been used to study a carbonate rock from a deep saline aquifer that is a potential candidate for storage reservoir for CO 2 sequestration. A new methodology is developed for

Ultra-Small-Angle Neutron Scattering with Azimuthal Asymmetry

June 1, 2016
Author(s)
X. Gu, David F. Mildner
Small-angle neutron scattering (SANS) measurements from thin rock samples such as shales demand as great a scattering vector range as possible because the pores cover a wide range of sizes. The limitation of the scattering vector range for pinhole SANS

Nanoscale Constraints on Porosity Generation and Fluid Flow during Serpentinization

February 1, 2016
Author(s)
Benjamin Tutolo, David F. Mildner, Cedric V. Gagnon, Martin O. Saar, Jr. Seyfried
Field samples of olivine-rich rocks are nearly always serpentinized¿often to completion¿but, paradoxically, their intrinsic porosity and permeability are diminishingly low. Serpentinization reactions occur through a coupled process of fluid infiltration

Comparison of Pinhole Collimation and Focusing Optics for SANS

September 21, 2015
Author(s)
Charles J. Glinka, John G. Barker, David F. Mildner
We examine quantitatively the instrumental factors that affect the theoretical performance and practical application of conventional pinhole collimation and focusing optics for Small-Angle Neutron Scattering (SANS) measurements. We calculate the relative

Pores in Marcellus Shale: A Neutron Scattering and FIB-SEM Study

January 26, 2015
Author(s)
Xin Gu, David R. Cole, Gernot Rother, David F. Mildner, Susan L. Brantley
Recently, the production of natural gas from black shale has increased dramatically due to the development of hydraulic fracturing techniques which significantly increase the porosity and fracture network of shales. Understanding these processes requires

How Oxidation and Dissolution in Diabase and Granite Control Porosity during Weathering

January 13, 2015
Author(s)
Ekaterina Bazilevskaya, Gernot Rother, David F. Mildner, Milan Pavich, David Cole, Maya P. Bhatt, Lixin Jin, Carl I. Steefel, Susan L. Brantley
Weathering extends to shallower depths on diabase than granite ridgetops despite similar climate and geomorphological regimes of despite similar climate and geomorphological regimes of denudation in the Virginia (USA) piedmont. Deeper weathering has been

Insight into Neutron Focusing: the Out-of-Focus Condition

October 1, 2013
Author(s)
Boualem Hammouda, David F. Mildner, A. Brulet, S. Desert
A three-pronged approach is used to investigate neutron focusing for small-angle neutron scattering instruments. The three methods are analytical calculations, resolution measurements, and computer simulations. A source aperture containing a single small

Correction of Optical Aberrations in Elliptic Neutron Guides

November 21, 2012
Author(s)
Phllip M. Bentley, Shane J. Kennedy, Ken H. Andersen, Damian Martin Rodriguez, David F. Mildner
Modern, nonlinear ballistic neutron guides are an attractive concept in neutron beam delivery and instrumentation, because they offer increased performance over straight or linearly tapered guides. However, like other ballistic geometries they have the

Pore Size Distribution and Accessible Pore Size Distribution in Bituminous Coals

October 1, 2012
Author(s)
Richard Sakurovs, Lilin He, Yuri B. Melnichenko, Andrzej P. Radlinski, Tomasz Blach, Hartmut Lemmel, David F. Mildner
Contrast-matching ultra-small-angle neutron scattering (USANS) and small-angle neutron scattering (SANS) techniques have been used to determine the fraction of the pores that are inaccessible to deuterated methane, CD 4, in 23 coals over the range of pores

Accessibility of Pores in Coal to Methane and Carbon Dioxide

January 1, 2012
Author(s)
Yuri B. Melnichenko, Lilin He, Richard Sakurovs, Arkady L. Kholodenko, Tomasz Blach, Maria Mastalerz, Andrzej P. Radlinski, Gang Cheng, David F. Mildner
Fluid-solid interactions in natural and engineered porous solids underlie a variety of technological processes, including geological storage of anthropogenic greenhouse gases, enhanced coal bed methane recovery, membrane separation, and heterogeneous
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