High temperature quasistatic and dynamic mechanical behavior of interconnected 3D carbon nanotube structures

Autor(es)

Bhowmick, Sanjit ^[1] ; Ozden, Sehmus ^[2] ; Bizao, Rafael A. ^[3] ; Machado, Leonardo Dantas ^[4] ; Asif, S. A. Syed ^[1] ; Pugno, Nicola M. ^{[5, 3, 6]} ; Galvao, Douglas S. ^[7] ; Tiwary, Chandra Sekhar ^{[8, 9]} ; Ajayan, P. M. ^[8]

Afiliação do(s) autor(es)

^[1] Bruker Nano Surfaces, Minneapolis, MN 55344 - USA

^[2] Los Alamos Natl Lab, Mat Phys & Applicat Div, Los Alamos, NM 87545 - USA

^[3] Univ Trento, Lab Bioinspired & Graphene Nanomech, Dept Civil Environm & Mech Engn, Via Mesiano 77, I-38123 Trento - Italy

^[4] Univ Fed Rio Grande do Norte, Dept Fis Teor & Expt, BR-59072970 Natal, RN - Brazil

^[5] Queen Mary Univ London, Sch Engn & Mat Sci, Mile End Rd, London E1 4NS - England

^[6] Italian Space Agcy, Ket Lab, Edoardo Amaldi Fdn, Via Politecn Snc, I-00133 Rome - Italy

^[7] Univ Estadual Campinas, Appl Phys Dept, BR-13083959 Campinas, SP - Brazil

^[8] Rice Univ, Mat Sci & Nanoengn, Houston, TX 77005 - USA

^[9] Indian Inst Technol, Met & Mat Engn, Kharagpur 721302, WB - India

• Tipo de documento: Artigo Científico
• Fonte: Carbon; v. 142, p. 291-299, FEB 2019.
• Citações Web of Science: 2

Resumo

Carbon nanotubes (CNTs) are one of the most appealing materials in recent history for both research and commercial interest because of their outstanding physical, chemical, and electrical properties. This is particularly true for 3D arrangements of CNTs which enable their use in larger scale devices and structures. In this paper, the effect of temperature on the quasistatic and dynamic deformation behavior of 3D CNT structures is presented for the first time. An in situ high-temperature nanomechanical instrument was used inside an SEM at high vacuum to investigate mechanical properties of covalently interconnected CNT porous structures in a wide range of temperature. An irreversible bucking at the base of pillar samples was found as a major mode of deformation at room and elevated temperatures. It has been observed that elastic modulus and critical load to first buckle formation decrease progressively with increasing temperature from 25 degrees C to 750 degrees C. To understand fatigue resistance, pillars made from this unique structure were compressed to 100 cycles at room temperature and 750 degrees C. While the structure showed remarkable resistance to fatigue at room temperature, high temperature significantly lowers fatigue resistance. Molecular dynamics (MD) simulation of compression highlights the critical role played by covalent interconnections which prevent localized bending and improve mechanical properties. (C) 2018 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 13/08293-7 - CECC - Centro de Engenharia e Ciências Computacionais
• Beneficiário: Munir Salomao Skaf
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs