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Title: Quantitative Analysis of Ultralow-Density Materials Using Laboratory-Based Quasi-Monochromatic Radiography

Abstract

The measurement of the density of materials, especially ultralow-density foams, is difficult in that the measurement must be precise and localizable. The density of the material is often governed by its cellular (i.e., porous) structure, and many techniques exist to create that structure. Often, the cellular structure can vary from one location within the material to another, and when at low densities (i.e., densities lower than ~500 mg/cm3), it can vary due to shrinkage during syneresis, collapse under the weight of gravity, or gas/water vapor uptake. Quantifying this variation is important for a variety of applications, especially when used in plasma physics targets. Knowing the density and its variation across the sample is critical for experimental results to be accurately predicted by physics calculations and for modeling the results of the physics targets. The use of quasi-monochromatic radiography provides a means to image the two-dimensional (2-D) distribution of density variation within silica aerogel materials and to quantitatively measure that variation from sample to sample and lot to lot. For this work, two batches of silica aerogels with targeted densities of ~20 mg/cm3 were created, one batch at Lawrence Livermore National Laboratory, and the other batch at Los Alamos National Laboratory.more » Outlined here is a quasi-monochromatic radiography system using various X-ray sources coupled to a doubly curved crystal optic and X-ray charge-coupled device camera to image and characterize these materials. It was found that measuring the density both gravimetrically and using quasi-monochromatic radiography were statistically identical, although the two batches were found to be slightly higher than their targeted density due to shrinkage. The radiography system also provided 2-D information as to the aerogel quality, i.e., presence of voids, chipped material, or inclusions.« less

Authors:
ORCiD logo [1];  [2];  [2]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [2];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1525751
Alternate Identifier(s):
OSTI ID: 1467269
Report Number(s):
LLNL-JRNL-754514; LA-UR-17-24939
Journal ID: ISSN 1536-1055; 941281
Grant/Contract Number:  
AC52-07NA27344; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 73; Journal Issue: 2; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 36 MATERIALS SCIENCE; Silica aerogel; quasi-monochromatic radiography; density measurement

Citation Formats

Patterson, Brian M., Sain, John, Seugling, Richard, Santiago-Cordoba, Miguel, Goodwin, Lynne, Oertel, John, Cowan, Joseph, Hamilton, Christopher E., Cordes, Nikolaus L., Gammon, Stuart A., and Baumann, Theodore F. Quantitative Analysis of Ultralow-Density Materials Using Laboratory-Based Quasi-Monochromatic Radiography. United States: N. p., 2017. Web. doi:10.1080/15361055.2017.1364923.
Patterson, Brian M., Sain, John, Seugling, Richard, Santiago-Cordoba, Miguel, Goodwin, Lynne, Oertel, John, Cowan, Joseph, Hamilton, Christopher E., Cordes, Nikolaus L., Gammon, Stuart A., & Baumann, Theodore F. Quantitative Analysis of Ultralow-Density Materials Using Laboratory-Based Quasi-Monochromatic Radiography. United States. doi:10.1080/15361055.2017.1364923.
Patterson, Brian M., Sain, John, Seugling, Richard, Santiago-Cordoba, Miguel, Goodwin, Lynne, Oertel, John, Cowan, Joseph, Hamilton, Christopher E., Cordes, Nikolaus L., Gammon, Stuart A., and Baumann, Theodore F. Mon . "Quantitative Analysis of Ultralow-Density Materials Using Laboratory-Based Quasi-Monochromatic Radiography". United States. doi:10.1080/15361055.2017.1364923. https://www.osti.gov/servlets/purl/1525751.
@article{osti_1525751,
title = {Quantitative Analysis of Ultralow-Density Materials Using Laboratory-Based Quasi-Monochromatic Radiography},
author = {Patterson, Brian M. and Sain, John and Seugling, Richard and Santiago-Cordoba, Miguel and Goodwin, Lynne and Oertel, John and Cowan, Joseph and Hamilton, Christopher E. and Cordes, Nikolaus L. and Gammon, Stuart A. and Baumann, Theodore F.},
abstractNote = {The measurement of the density of materials, especially ultralow-density foams, is difficult in that the measurement must be precise and localizable. The density of the material is often governed by its cellular (i.e., porous) structure, and many techniques exist to create that structure. Often, the cellular structure can vary from one location within the material to another, and when at low densities (i.e., densities lower than ~500 mg/cm3), it can vary due to shrinkage during syneresis, collapse under the weight of gravity, or gas/water vapor uptake. Quantifying this variation is important for a variety of applications, especially when used in plasma physics targets. Knowing the density and its variation across the sample is critical for experimental results to be accurately predicted by physics calculations and for modeling the results of the physics targets. The use of quasi-monochromatic radiography provides a means to image the two-dimensional (2-D) distribution of density variation within silica aerogel materials and to quantitatively measure that variation from sample to sample and lot to lot. For this work, two batches of silica aerogels with targeted densities of ~20 mg/cm3 were created, one batch at Lawrence Livermore National Laboratory, and the other batch at Los Alamos National Laboratory. Outlined here is a quasi-monochromatic radiography system using various X-ray sources coupled to a doubly curved crystal optic and X-ray charge-coupled device camera to image and characterize these materials. It was found that measuring the density both gravimetrically and using quasi-monochromatic radiography were statistically identical, although the two batches were found to be slightly higher than their targeted density due to shrinkage. The radiography system also provided 2-D information as to the aerogel quality, i.e., presence of voids, chipped material, or inclusions.},
doi = {10.1080/15361055.2017.1364923},
journal = {Fusion Science and Technology},
number = 2,
volume = 73,
place = {United States},
year = {2017},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Table 1 Table 1: This table shows the average measured density for different samples.

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