Jamie L. Weaver

Material Measurement Laboratory

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Co-Authors

John S. McCloy

Washington State University

Carolyn I. Pearce

Pacific Northwest National Laboratory

David K. Peeler

Pacific Northwest National Laboratory

José Marcial

Pacific Northwest National Laboratory

Edward P. Vicenzi

Smithsonian Institution

Albert A. Kruger

United States Department of Energy

Jessica L. Allen

Grace College & Seminary

Tanya E. Cheeke

Washington State University

Vincent Danna

Pacific Northwest National Laboratory

Rolf Sjöblom

Luleå University of Technology

Cooperative Institutions

Pacific Northwest National Laboratory

New York University Press

Battelle

University of Maryland, College Park

National Institute of Standards and Technology

Environmental Molecular Sciences Laboratory

Richland College

University of Notre Dame

Joint Institute for Nuclear Astrophysics

Material Measurement Laboratory

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Filtration Efficiencies of Nanoscale Aerosol by Cloth Mask Materials Used to Slow the Spread of SARS-CoV-2

ACS Nano (2020)

Christopher D. Zangmeister James G. Radney Edward P. Vicenzi Jamie L. Weaver

Filtration efficiency (FE), differential pressure (ΔP), quality factor (QF), and construction parameters were measured for 32 cloth materials (14 cotton, 1 wool, 9 synthetic, 4 synthetic blends, and 4 synthetic/cotton blends) used in cloth masks intended for protection from the SARS-CoV-2 virus (diameter 100 ± 10 nm). Seven polypropylene-based fiber filter materials were also measured including surgical masks and N95 respirators. Additional measurements were performed on both multilayered and mixed-material samples of natural, synthetic, or natural-synthetic blends to mimic cloth mask construction methods. Materials were microimaged and tested against size selected NaCl aerosol with particle mobility diameters between 50 and 825 nm. Three of the top five best performing samples were woven 100% cotton with high to moderate yarn counts, and the other two were woven synthetics of moderate yarn counts. In contrast to recently published studies, samples utilizing mixed materials did not exhibit a significant difference in the measured FE when compared to the product of the individual FE for the components. The FE and ΔP increased monotonically with the number of cloth layers for a lightweight flannel, suggesting that multilayered cloth masks may offer increased protection from nanometer-sized aerosol with a maximum FE dictated by breathability (i.e., ΔP).

Respirator

Filtration (mathematics)

Polypropylene

Nanometre

Woven fabric

Particle (ecology)

10.1021/acsnano.0c05025

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Citations (267)

Data for EMSL Project 51400 from January 2022

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2022)

Kitt Bagwell John S. McCloy Carolyn I. Pearce Jamie L. Weaver Jim Neeway

10.25582/data.2022-01.2414127/2177221

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Citations (0)

Data for EMSL Project 49141 from March 2022

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2022)

Edgar C. Buck Tiffany C. Kaspar Sébastien Kerisit Joseph V. Ryan Carolyn I. Pearce

10.25582/data.2022-03.2449181/2356732

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Micro- and Nanoscale Surface Analysis of Late Iron Age Glass from Broborg, a Vitrified Swedish Hillfort

Microscopy and Microanalysis (2023)

Bethany E. Matthews James J. Neeway Lorena Nava Farias José Marcial Bruce W. Arey

Abstract Archaeological glasses with prolonged exposure to biogeochemical processes in the environment can be used to understand glass alteration, which is important for the safe disposal of vitrified nuclear waste. Samples of mafic and felsic glasses with different chemistries, formed from melting amphibolitic and granitoid rocks, were obtained from Broborg, a Swedish Iron Age hillfort. Glasses were excavated from the top of the hillfort wall and from the wall interior. A detailed microscopic, spectroscopic, and diffraction study of surficial textures and chemistries were conducted on these glasses. Felsic glass chemistry was uniform, with a smooth surface showing limited chemical alteration (<150 nm), irrespective of the position in the wall. Mafic glass was heterogeneous, with pyroxene, spinel, feldspar, and quartz crystals in the glassy matrix. Mafic glass surfaces in contact with topsoil were rougher than those within the wall and had carbon-rich material consistent with microbial colonization. Limited evidence for chemical or physical alteration of mafic glass was found; the thin melt film that coated all exposed surfaces remained intact, despite exposure to hydraulically unsaturated conditions, topsoil, and associated microbiome for over 1,500 years. This supports the assumption that aluminosilicate nuclear waste glasses will have a high chemical durability in near-surface disposal facilities.

Felsic

Volcanic glass

Borosilicate glass

10.1093/micmic/ozac032

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Citations (3)

Considerations in applying neutron depth profiling (NDP) to Li-ion battery research

Journal of Materials Chemistry A (2021)

Daniel J. Lyons Jamie L. Weaver Anne C. Co

Li distribution within the battery electrode material is quantified using neutron depth profiling (NDP) as a function of depth in real-time.

Profiling (computer programming)

Neutron Activation Analysis

10.1039/d1ta09639g

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Citations (14)

(Invited) Considerations in Sample Environment and Data Processing for Operando Cell Studies by Neutron Depth Profiling

Meeting abstracts/Meeting abstracts (Electrochemical Society. CD-ROM) (2023)

Jamie L. Weaver

Neutron depth profiling (NDP) is a nominally non-destructive analytical technique used to measure select isotopes ( 6 Li, 14 N, 10 B, etc...) in a diversity of materials. NDP can be conducted on operating Li-ion cells and be used to provide researchers real-time information about cell formation, conductance, and resilience. The increased use of NDP for electrochemical studies within the past decade has inspired the development of new sample preparation and data reduction strategies. Select topics that have been studied in the U.S. have included issues of neutron attenuation and scattering due to the addition of a protective capping layer over a cell, the possible need for matrix matched standards for complex materials, and the streamlining of the NDP data reduction procedure. Several challenges remain, however, including improving NDP data acquisition and reduction methods for detectable, low-Z isotopes such as 14 N and 35 Cl and improving upon the NDP data reduction and processing procedures so that they are more accessible to non-instrument specialists. All these topics will be discussed in this presentation.

Profiling (computer programming)

Sample (material)

10.1149/ma2023-02552693mtgabs

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Citations (0)

Challenges and Solutions for Handling and Characterizing Alkali-Tc-Oxide Salts

MRS Advances (2018)

Jamie L. Weaver Chuck Z. Soderquist Nancy Washton Paul L. Gassman Éric Walter

Characterization

Magic angle spinning

10.1557/adv.2018.165

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