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Title: Metal-nanotube composites as radiation resistant materials

Abstract

The improvement of radiation resistance in nanocomposite materials is investigated by means of classical reactive molecular dynamics simulations. In particular, we study the influence of carbon nanotubes (CNTs) in an Ni matrix on the trapping and possible outgassing of He. When CNTs are defect-free, He atoms diffuse alongside CNT walls and, although there is He accumulation at the metal-CNT interface, no He trespassing of the CNT wall is observed, which is consistent with the lack of permeability of a perfect graphene sheet. However, when vacancies are introduced to mimic radiation-induced defects, He atoms penetrate CNTs, which play the role of nano-chimneys, allowing He atoms to escape the damaged zone and reduce bubble formation in the matrix. Consequently, composites made of CNTs inside metals are likely to display improved radiation resistance, particularly when radiation damage is related to swelling and He-induced embrittlement.

Authors:
; ; ;  [1];  [2]; ;  [3];  [4]
  1. Departamento de Física, Facultad de Ciencias, CEDENNA, Universidad de Chile, Casilla 653, Santiago 7800024 (Chile)
  2. Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
  3. Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
  4. CONICET and Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza 5500 (Argentina)
Publication Date:
OSTI Identifier:
22594479
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 109; Journal Issue: 3; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BUBBLES; BUILDUP; CARBON NANOTUBES; COMPUTERIZED SIMULATION; DEFECTS; FORMATION DAMAGE; GRAPHENE; HELIUM; MATRICES; METALS; MOLECULAR DYNAMICS METHOD; NANOCOMPOSITES; PERMEABILITY; RADIATION EFFECTS; SWELLING; VACANCIES; WALLS

Citation Formats

González, Rafael I., Valencia, Felipe, Mella, José, Kiwi, Miguel, E-mail: m.kiwi.t@gmail.com, Duin, Adri C. T. van, So, Kang Pyo, Li, Ju, and Bringa, Eduardo M. Metal-nanotube composites as radiation resistant materials. United States: N. p., 2016. Web. doi:10.1063/1.4959246.
González, Rafael I., Valencia, Felipe, Mella, José, Kiwi, Miguel, E-mail: m.kiwi.t@gmail.com, Duin, Adri C. T. van, So, Kang Pyo, Li, Ju, & Bringa, Eduardo M. Metal-nanotube composites as radiation resistant materials. United States. doi:10.1063/1.4959246.
González, Rafael I., Valencia, Felipe, Mella, José, Kiwi, Miguel, E-mail: m.kiwi.t@gmail.com, Duin, Adri C. T. van, So, Kang Pyo, Li, Ju, and Bringa, Eduardo M. 2016. "Metal-nanotube composites as radiation resistant materials". United States. doi:10.1063/1.4959246.
@article{osti_22594479,
title = {Metal-nanotube composites as radiation resistant materials},
author = {González, Rafael I. and Valencia, Felipe and Mella, José and Kiwi, Miguel, E-mail: m.kiwi.t@gmail.com and Duin, Adri C. T. van and So, Kang Pyo and Li, Ju and Bringa, Eduardo M.},
abstractNote = {The improvement of radiation resistance in nanocomposite materials is investigated by means of classical reactive molecular dynamics simulations. In particular, we study the influence of carbon nanotubes (CNTs) in an Ni matrix on the trapping and possible outgassing of He. When CNTs are defect-free, He atoms diffuse alongside CNT walls and, although there is He accumulation at the metal-CNT interface, no He trespassing of the CNT wall is observed, which is consistent with the lack of permeability of a perfect graphene sheet. However, when vacancies are introduced to mimic radiation-induced defects, He atoms penetrate CNTs, which play the role of nano-chimneys, allowing He atoms to escape the damaged zone and reduce bubble formation in the matrix. Consequently, composites made of CNTs inside metals are likely to display improved radiation resistance, particularly when radiation damage is related to swelling and He-induced embrittlement.},
doi = {10.1063/1.4959246},
journal = {Applied Physics Letters},
number = 3,
volume = 109,
place = {United States},
year = 2016,
month = 7
}
  • In this Letter, we investigated the photo-response of multi wall carbon nanotube-based composites obtained from in situ thermal evaporation of noble metals (Au, Ag, and Cu) on the nanotube films. The metal deposition process produced discrete nanoparticles on the nanotube outer walls. The nanoparticle-carbon nanotube films were characterized by photo-electrochemical measurements in a standard three electrode cell. The photocurrent from the decorated carbon nanotubes remarkably increased with respect to that of bare multiwall tubes. With the aid of first-principle calculations, these results are discussed in terms of metal nanoparticle-nanotube interactions and electronic charge transfer at the interface.
  • The mechanism of the radiation induced degradation of the mechanical properties in composite materials have been studied and based on the mechanism the radiation resistant organic composites for fusion magnet have been developing. It was found that the degradation was brought by the change of the fracture mode from tensile (or flexural) to shear failure. Consequently the intrinsic parameter which control the degradation was concluded to be the interlaminar shear strength. To develop the radiation resistant composites, therefore, means to develop the composites showing the radiation resistant interlaminar shear strength. The mechanism was confirmed using three dimensional fabric reinforced plasticsmore » which do not have the interlaminar area. The roles of matrix in the composites were also revealed. The effects of dose quality and irradiated temperature on the radiation induced degradation were also discussed and the selection standards of the components for radiation resistant composites were proposed.« less
  • Ceramic matrix composites (CMC), particularly silicon carbide (SiC) fiber-reinforced SiC-matrix (SiC/SiC) composites, have been studied for advanced nuclear energy applications for more than a decade. The perceived potentials for advanced SiC/SiC composites include the ability to operate at temperature regimes much higher than heat-resistant alloys, the inherent low induced-activation nuclear properties, and the tolerance against neutron irradiation at high temperatures. This paper reviews the recent research and development of the advanced radiation-resistant SiC/SiC composites for nuclear applications. Additionally, remaining general and specific technical issues for SiC/SiC composites for nuclear applications are discussed.
  • Abstract not provided.