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Title: Gold Aerogel Monoliths with Tunable Ultralow Densities

Abstract

Herein we report the fabrication of ultralight gold aerogel monoliths with tunable densities and pore structures. Gold nanowires are prepared at the gram scale by substrate-assisted growth with uniform size, ultrathin diameters, high purity, and a high aspect ratio. Freeze-casting of suspensions of these nanowires produces free-standing, monolithic aerogels with tunable densities from 6 to 23 mg/cm 3, which to the best of our knowledge represents the lowest density monolithic gold material. We also demonstrate that the pore geometries created during freeze-casting can be systematically tuned across multiple length scales by the selection of different solvents and excipients in the feedstock suspension. Here, the mechanical behavior of porous materials depends on relative density and pore architectures.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1592018
Report Number(s):
LLNL-JRNL-762478
Journal ID: ISSN 1530-6984; 951051
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 20; Journal Issue: 1; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; Gold nanowires; gold aerogels; metal foams; ultralight; nanoporous

Citation Formats

Qian, Fang, Troksa, Alyssa, Fears, Tyler M., Nielsen, Michael H., Nelson, Art J., Baumann, Theodore F., Kucheyev, Sergei O., Han, T. Yong-Jin, and Bagge-Hansen, Michael. Gold Aerogel Monoliths with Tunable Ultralow Densities. United States: N. p., 2019. Web. doi:10.1021/acs.nanolett.9b03445.
Qian, Fang, Troksa, Alyssa, Fears, Tyler M., Nielsen, Michael H., Nelson, Art J., Baumann, Theodore F., Kucheyev, Sergei O., Han, T. Yong-Jin, & Bagge-Hansen, Michael. Gold Aerogel Monoliths with Tunable Ultralow Densities. United States. doi:10.1021/acs.nanolett.9b03445.
Qian, Fang, Troksa, Alyssa, Fears, Tyler M., Nielsen, Michael H., Nelson, Art J., Baumann, Theodore F., Kucheyev, Sergei O., Han, T. Yong-Jin, and Bagge-Hansen, Michael. Thu . "Gold Aerogel Monoliths with Tunable Ultralow Densities". United States. doi:10.1021/acs.nanolett.9b03445.
@article{osti_1592018,
title = {Gold Aerogel Monoliths with Tunable Ultralow Densities},
author = {Qian, Fang and Troksa, Alyssa and Fears, Tyler M. and Nielsen, Michael H. and Nelson, Art J. and Baumann, Theodore F. and Kucheyev, Sergei O. and Han, T. Yong-Jin and Bagge-Hansen, Michael},
abstractNote = {Herein we report the fabrication of ultralight gold aerogel monoliths with tunable densities and pore structures. Gold nanowires are prepared at the gram scale by substrate-assisted growth with uniform size, ultrathin diameters, high purity, and a high aspect ratio. Freeze-casting of suspensions of these nanowires produces free-standing, monolithic aerogels with tunable densities from 6 to 23 mg/cm3, which to the best of our knowledge represents the lowest density monolithic gold material. We also demonstrate that the pore geometries created during freeze-casting can be systematically tuned across multiple length scales by the selection of different solvents and excipients in the feedstock suspension. Here, the mechanical behavior of porous materials depends on relative density and pore architectures.},
doi = {10.1021/acs.nanolett.9b03445},
journal = {Nano Letters},
number = 1,
volume = 20,
place = {United States},
year = {2019},
month = {10}
}

Journal Article:
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This content will become publicly available on October 17, 2020
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