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Title: Dry Sintered Metal Coating of Halloysite Nanotubes

Abstract

Halloysite nanotubes (HNTs) are a naturally-occurring aluminosilicate whose dimensions measure microns in length and tens of nanometers in diameter. Bonding defects between the alumina and silica lead to net negative and positive charges on the exterior and interior lumen, respectively. HNTs have been shown to enhance the material properties of polymer matrices and enable the sustained release of loaded chemicals, drugs, and growth factors. Due to the net charges, these nanotubes can also be readily coated in layered-depositions using the HNT exterior lumen’s net negative charge as the basis for assembly. These coatings are primarily done through wet chemical processes, the majority of which are limited in their use of desired chemicals, due to the polarity of the halloysite. Furthermore, this restriction in the type of chemicals used often requires the use of more toxic chemicals in place of greener options, and typically necessitates the use of a significantly longer chemical process to achieve the desired coating. In this study, we show that HNTs can be coated with metal acetylacetonates—compounds primarily employed in the synthesis of nanoparticles, as metal catalysts, and as NMR shift reagents—through a dry sintering process. This method was capable of thermally decaying the metal acetylacetonate, resultingmore » in a free positively-charged metal ion that readily bonded to the negatively-charged HNT exterior, resulting in metallic coatings forming on the HNT surface. Our coating method may enable greater deposition of coated material onto these nanotubes as required for a desired application. Moreover, the use of chemical processes using toxic chemicals is not required, thus eliminating exposure« less

Authors:
 [1];  [2];  [2];  [2]; ORCiD logo [2]
  1. Oak Ridge Associated Univ., Savannah River National Lab., Aiken, SC (United States)
  2. Louisiana Tech Univ., Ruston, LA (United States)
Publication Date:
Research Org.:
Oak Ridge Associated Universities (ORAU), Oak Ridge, TN (United States); Louisiana Tech Univ., Ruston, LA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1421935
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Applied Sciences
Additional Journal Information:
Journal Volume: 6; Journal Issue: 12; Journal ID: ISSN 2076-3417
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 3D printing; filaments; additive manufacturing; halloysite

Citation Formats

Nicholson, James C., Weisman, Jeffery A., Boyer, Christen J., Wilson, Chester G., and Mills, David K.. Dry Sintered Metal Coating of Halloysite Nanotubes. United States: N. p., 2016. Web. doi:10.3390/app6090265.
Nicholson, James C., Weisman, Jeffery A., Boyer, Christen J., Wilson, Chester G., & Mills, David K.. Dry Sintered Metal Coating of Halloysite Nanotubes. United States. doi:10.3390/app6090265.
Nicholson, James C., Weisman, Jeffery A., Boyer, Christen J., Wilson, Chester G., and Mills, David K.. Mon . "Dry Sintered Metal Coating of Halloysite Nanotubes". United States. doi:10.3390/app6090265. https://www.osti.gov/servlets/purl/1421935.
@article{osti_1421935,
title = {Dry Sintered Metal Coating of Halloysite Nanotubes},
author = {Nicholson, James C. and Weisman, Jeffery A. and Boyer, Christen J. and Wilson, Chester G. and Mills, David K.},
abstractNote = {Halloysite nanotubes (HNTs) are a naturally-occurring aluminosilicate whose dimensions measure microns in length and tens of nanometers in diameter. Bonding defects between the alumina and silica lead to net negative and positive charges on the exterior and interior lumen, respectively. HNTs have been shown to enhance the material properties of polymer matrices and enable the sustained release of loaded chemicals, drugs, and growth factors. Due to the net charges, these nanotubes can also be readily coated in layered-depositions using the HNT exterior lumen’s net negative charge as the basis for assembly. These coatings are primarily done through wet chemical processes, the majority of which are limited in their use of desired chemicals, due to the polarity of the halloysite. Furthermore, this restriction in the type of chemicals used often requires the use of more toxic chemicals in place of greener options, and typically necessitates the use of a significantly longer chemical process to achieve the desired coating. In this study, we show that HNTs can be coated with metal acetylacetonates—compounds primarily employed in the synthesis of nanoparticles, as metal catalysts, and as NMR shift reagents—through a dry sintering process. This method was capable of thermally decaying the metal acetylacetonate, resulting in a free positively-charged metal ion that readily bonded to the negatively-charged HNT exterior, resulting in metallic coatings forming on the HNT surface. Our coating method may enable greater deposition of coated material onto these nanotubes as required for a desired application. Moreover, the use of chemical processes using toxic chemicals is not required, thus eliminating exposure},
doi = {10.3390/app6090265},
journal = {Applied Sciences},
number = 12,
volume = 6,
place = {United States},
year = {Mon Sep 19 00:00:00 EDT 2016},
month = {Mon Sep 19 00:00:00 EDT 2016}
}

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Cited by: 1 work
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Works referenced in this record:

Non-aqueous routes to crystalline metal oxide nanoparticles: Formation mechanisms and applications
journal, January 2005