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Nanomechanics of Carbon Nanomaterials
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Nanomechanics of Carbon Nanomaterials

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "2D and Carbon Nanomaterials".

Deadline for manuscript submissions: closed (20 October 2021) | Viewed by 16635

Special Issue Editors

Prof. Dr. Go Yamamoto

E-Mail Website
Guest Editor
Department of Aerospace Engineering, Tohoku University, 6-6-01 Aramaki Aza Aoba, Aoba-ku, Sendai 980-8579, Japan
Interests: composite materials; nanomechanics; micromechanics; carbon nanomaterials; resonance ultrasound spectroscopy; high-throughput screening calculation
Prof. Dr. Ji Won Suk

E-Mail Website
Guest Editor
School of Mechanical Engineering, Sungkyunkwan University, 2066 Seobu-ro, Suwon 16419, Gyeonggi-do, Korea
Interests: nanocomposites; carbon nanomaterials; 2D materials; micro/nanomechanics; adhesion properties; smart materials and structures; flexible and stretchable devices

Special Issue Information

Dear Colleagues,


Miniaturization of structural components such as electronic/optic devices and MEMS/NEMS is a recent trend, the pace of which has accelerated over the past decade. The size of their components is now approaching nano/atomic scales, and it has been recognized that unusual fracture behaviors that are not observed in macroscopic materials occur in materials with nano/atomic dimensions. The dissemination of knowledge around fracture nanomechanics and mechanical characterization of such nanomaterials and possibilities of global use, hence, carry immense significance.

Topics included in this Special Issue on “Nanomechanics of Carbon Nanomaterials” cover a wide range of research in the field of nanomechanics of carbon nanomaterials and their nanocomposites. The main aim is to get a scientific understanding of the broad range of nanomechanics and mechanical properties of such carbon nanomaterials through the introduction of the state-of-the-art experimental and simulation techniques.

It is our pleasure to invite you to submit a manuscript to this Special Issue which provides an excellent opportunity to publish your latest advances in the relevant research fields. Submissions of communications, full papers, and reviews are all welcomed. We look forward to your contributions and fruitful discussions.


Prof. Dr. Go Yamamoto
Prof. Dr. Ji Won Suk
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Carbon nanomaterials
  • Nanocomposites
  • Fracture nanomechanics
  • Mechanical properties
  • Experimental research
  • Numerical simulation research

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Published Papers (5 papers)

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Research

18 pages, 4994 KiB  
Article
Βio-Based Epoxy/Amine Reinforced with Reduced Graphene Oxide (rGO) or GLYMO-rGO: Study of Curing Kinetics, Mechanical Properties, Lamination and Bonding Performance
by Sheikh Rehman, Julio Gomez, Elvira Villaro, Dwane Cossey and Panagiotis G. Karagiannidis
Nanomaterials 2022, 12(2), 222; https://doi.org/10.3390/nano12020222 - 10 Jan 2022
Cited by 8 | Viewed by 2558
Abstract
In this work, we report the synthesis and study of nanocomposites with a biobased epoxy/amine (Epilok 60-600G/Curamine 30-952) matrix reinforced with reduced graphene oxide (rGO) or functionalised with 3-glycidoxypropyltrimethoxysilane (GLYMO-rGO). These graphene related materials (GRMs) were first dispersed into a Curamine hardener using [...] Read more.
In this work, we report the synthesis and study of nanocomposites with a biobased epoxy/amine (Epilok 60-600G/Curamine 30-952) matrix reinforced with reduced graphene oxide (rGO) or functionalised with 3-glycidoxypropyltrimethoxysilane (GLYMO-rGO). These graphene related materials (GRMs) were first dispersed into a Curamine hardener using bath ultrasonication, followed by the addition of epoxy resin. Curing kinetics were studied by DSC under non-isothermal and isothermal conditions. The addition of 1.5 wt% of GLYMO-rGO into the epoxy matrix was found to increase the degree of cure by up to 12% and glass transition temperature by 14 °C. Mechanical testing showed that the addition of 0.05 wt% GLYMO-rGO improves Young’s modulus and tensile strength by 60% and 16%, respectively, compared to neat epoxy. Carbon fibre reinforced polymer (CFRP) laminates were prepared via hand lay up, using the nanocomposite system GRM/Epilok/Curamine as matrix, and were cut as CFRP adherents for lap shear joints. GRM/Epilok/Curamine was also used as adhesive to bond CFRP/CFRP and CFRP/aluminium adherents. The addition of 0.1 wt% GLYMO-rGO into the adhesive and CRFP adherents showed improved lap shear strength by 23.6% compared to neat resin, while in the case of CFRP/Aluminium joints the increase was 21.2%. Full article
(This article belongs to the Special Issue Nanomechanics of Carbon Nanomaterials)
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10 pages, 2050 KiB  
Article
Interlayer Separation in Graphene Paper Comprising Electrochemically Exfoliated Graphene
by Dang Du Nguyen, TaeGyeong Lim, Soomook Lim and Ji Won Suk
Nanomaterials 2021, 11(4), 865; https://doi.org/10.3390/nano11040865 - 29 Mar 2021
Cited by 5 | Viewed by 3254
Abstract
The emergence of graphene paper comprising well-stacked graphene flakes has promoted the application of graphene-based materials in diverse fields such as energy storage devices, membrane desalination, and actuators. The fundamental properties of graphene paper such as mechanical, electrical, and thermal properties are critical [...] Read more.
The emergence of graphene paper comprising well-stacked graphene flakes has promoted the application of graphene-based materials in diverse fields such as energy storage devices, membrane desalination, and actuators. The fundamental properties of graphene paper such as mechanical, electrical, and thermal properties are critical to the design and fabrication of paper-based devices. In this study, the interlayer interactions in graphene paper were investigated by double cantilever beam (DCB) fracture tests. Graphene papers fabricated by flow-directed stacking of electrochemically exfoliated few-layer graphene flakes were mechanically separated into two parts, which generated force-displacement responses of the DCB sample. The analysis based on fracture mechanics revealed that the interlayer separation energy of the graphene paper was 9.83 ± 0.06 J/m2. The results provided a fundamental understanding of the interfacial properties of graphene papers, which will be useful for developing paper-based devices with mechanical integrity. Full article
(This article belongs to the Special Issue Nanomechanics of Carbon Nanomaterials)
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10 pages, 3432 KiB  
Article
Molecular Dynamics Simulations and Theoretical Model for Engineering Tensile Properties of Single-and Multi-Walled Carbon Nanotubes
by Keiichi Shirasu, Shunsuke Kitayama, Fan Liu, Go Yamamoto and Toshiyuki Hashida
Nanomaterials 2021, 11(3), 795; https://doi.org/10.3390/nano11030795 - 19 Mar 2021
Cited by 20 | Viewed by 2855
Abstract
To apply carbon nanotubes (CNTs) as reinforcing agents in next-generation composites, it is essential to improve their nominal strength. However, since it is difficult to completely remove the defects, the synthesis guideline for improving nominal strength is still unclear, i.e., the effective strength [...] Read more.
To apply carbon nanotubes (CNTs) as reinforcing agents in next-generation composites, it is essential to improve their nominal strength. However, since it is difficult to completely remove the defects, the synthesis guideline for improving nominal strength is still unclear, i.e., the effective strength and the number of nanotube layers required to improve the nominal strength has been undermined. In this study, molecular dynamics simulations were used to elucidate the effects of vacancies on the mechanical properties of CNTs. Additionally, the relationships between the number of layers and effective and nominal strengths of CNTs were discussed theoretically. The presence of extensive vacancies provides a possible explanation for the low nominal strengths obtained in previous experimental measurements of CNTs. This study indicates that the nominal strength can be increased from the experimentally obtained values of 10 GPa to approximately 20 GPa by using six to nine nanotube layers, even if the increase in effective strength of each layer is small. This has advantages over double-walled CNTs, because the effective strength of such CNTs must be approximately 60 GPa to achieve a nominal strength of 20 GPa. Full article
(This article belongs to the Special Issue Nanomechanics of Carbon Nanomaterials)
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12 pages, 3123 KiB  
Article
Study of Piezoresistive Behavior of Smart Cement Filled with Graphene Oxide
by Rongxin Guo, Yuxia Suo, Haiting Xia, Yang Yang, Qianmin Ma and Feng Yan
Nanomaterials 2021, 11(1), 206; https://doi.org/10.3390/nano11010206 - 15 Jan 2021
Cited by 34 | Viewed by 2749
Abstract
A cement-based piezoelectric composite, modified by graphene oxide (GO), was prepared to study piezoresistive capacity. The testing confirms that GO is more effective than other carbon nanomaterials at improving piezoresistive sensitivity of cement-based composites, because the content of GO in cement paste was [...] Read more.
A cement-based piezoelectric composite, modified by graphene oxide (GO), was prepared to study piezoresistive capacity. The testing confirms that GO is more effective than other carbon nanomaterials at improving piezoresistive sensitivity of cement-based composites, because the content of GO in cement paste was much lower than other carbon nanomaterials used in previously published research. Further investigation indicates that the addition of GO significantly improved the stability and repeatability for piezoresistive capacity of cement paste under cycle loads. Based on experiment results, the piezoresistive sensitivity of this composite depended on GO content, water-to-cement weight ratio (w/c) and water-loss rate, since the highest piezoresistive gauge factor value (GF = 35) was obtained when GO content was 0.05 wt.%, w/c was 0.35 and water-loss rate was 3%. Finally, microstructure analysis confirmed that conductivity and piezoresistivity were achieved through a tunneling effect and by contacting conduction that caused deformation of GO networks in the cement matrix. Full article
(This article belongs to the Special Issue Nanomechanics of Carbon Nanomaterials)
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Graphical abstract

13 pages, 2841 KiB  
Article
Machine Learning-Assisted High-Throughput Molecular Dynamics Simulation of High-Mechanical Performance Carbon Nanotube Structure
by Yi Xiang, Koji Shimoyama, Keiichi Shirasu and Go Yamamoto
Nanomaterials 2020, 10(12), 2459; https://doi.org/10.3390/nano10122459 - 9 Dec 2020
Cited by 18 | Viewed by 4231
Abstract
Carbon nanotubes (CNTs) are novel materials with extraordinary mechanical properties. To gain insight on the design of high-mechanical-performance CNT-reinforced composites, the optimal structure of CNTs with high nominal tensile strength was determined in this study, where the nominal values correspond to the cross-sectional [...] Read more.
Carbon nanotubes (CNTs) are novel materials with extraordinary mechanical properties. To gain insight on the design of high-mechanical-performance CNT-reinforced composites, the optimal structure of CNTs with high nominal tensile strength was determined in this study, where the nominal values correspond to the cross-sectional area of the entire specimen, including the hollow core. By using machine learning-assisted high-throughput molecular dynamics (HTMD) simulation, the relationship among the following structural parameters/properties was investigated: diameter, number of walls, chirality, and crosslink density. A database, comprising the various tensile test simulation results, was analyzed using a self-organizing map (SOM). It was observed that the influence of crosslink density on the nominal tensile strength tends to gradually decrease from the outside to the inside; generally, the crosslink density between the outermost wall and its adjacent wall is highly significant. In particular, based on our calculation conditions, five-walled, armchair-type CNTs with an outer diameter of 43.39 Å and crosslink densities (between the inner wall and outer wall) of 1.38 ± 1.16%, 1.13 ± 0.69%, 1.54 ± 0.57%, and 1.36 ± 0.35% were believed to be the optimal structure, with the nominal tensile strength and nominal Young’s modulus reaching approximately 58–64 GPa and 677–698 GPa. Full article
(This article belongs to the Special Issue Nanomechanics of Carbon Nanomaterials)
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