Gold Aerogel Monoliths with Tunable Ultralow Densities

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

doi:10.1021/acs.nanolett.9b03445

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/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.

Authors:

^[1]; Troksa, Alyssa ^[1];

^[1]; Nielsen, Michael H. ^[1]; Nelson, Art J. ^[1]; Baumann, Theodore F. ^[1]; Kucheyev, Sergei O. ^[1];

^[1]; Bagge-Hansen, Michael ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Publication Date:: Thu Oct 17 00:00:00 EDT 2019

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.

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                    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.  https://doi.org/10.1021/acs.nanolett.9b03445

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                    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.  https://doi.org/10.1021/acs.nanolett.9b03445.  https://www.osti.gov/servlets/purl/1592018.

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@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         = {Thu Oct 17 00:00:00 EDT 2019},

  month        = {Thu Oct 17 00:00:00 EDT 2019}

}

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https://doi.org/10.1021/acs.nanolett.9b03445

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Cited by: 18 works

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Figure 1: Nanowire growth and aerogel fabrication. (a) A schematic of large-scale synthesis on an array of Si wafers. (b) Typical SEM image of nanowires grown on Si wafers. Scale bar is 5 m. (c) High-resolution TEM image of a single nanowire and its representative structural model. Scale bar ismore »

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