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Nanomaterials
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Mechanics of Nanomaterials and Low-Dimensional Materials
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Mechanics of Nanomaterials and Low-Dimensional Materials

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Physical Chemistry at Nanoscale".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 4427

Special Issue Editors

Dr. ‪Mingchao ‬ Wang

E-Mail Website
Guest Editor
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, Australia
Interests: electro-chemo-mechanics; heat and mass transfer; energy materials; stimuli-responsive polymers; composites
Dr. Zhaohui Xia

E-Mail Website
Guest Editor
School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Interests: isogeometric topology optimization; new generation CAD/CAE incorporate methods and techniques; GPU parallel computing
Special Issues, Collections and Topics in MDPI journals
Dr. Jingui Yu

E-Mail Website
Guest Editor
School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, China
Interests: structural design; optimization and multi-scale simulation of mechanical properties of metal and composite parts

Special Issue Information

Dear Colleagues,

Nanomaterials and low-dimensional materials have attracted tremendous research attention in the last two decades due to their potential applications in broad fields, such as nano-energy, nano-electronics and nano-biotechnology. The structure-property relationship at the nanoscale is found to facilitate their unique physical behavior. Among various physical properties, the mechanical properties of these nanostructure-based materials act as a significant foundation for their functional applications. It is, thus, urgent to develop/utilize new mechanics theories, as well as computational and experimental techniques, to explore the mechanical behavior of nanostructure-based materials across different length scales.

This Special Issue aims to present the latest advances in experimental or theoretical/computational investigations in the multi-scale mechanical properties of nanomaterials (i.e., nanocomposites) and low-dimensional materials (i.e., nanoparticles, nanowires and nanosheets). It also focuses on the development of new theories, computational and experimental techniques in the context of nanomechanics and micromechanics. Articles on the multi-field coupling behavior and functional applications of these materials are also highly welcome. Research areas may include (but are not limited to) the following:

  • Theoretical/computational/experimental studies of the mechanical properties of nanomaterials and low-dimensional materials;
  • Development of advanced theories and computational techniques in nanomechanics and micromechanics;
  • Development of advanced experimental techniques in nano-/micro-mechanical testing;
  • Multi-field (mechanical, chemical, electrical) coupling performance and applications of nanostructure-based materials.

Dr. ‪Mingchao ‬ Wang
Dr. Zhaohui Xia
Dr. Jingui Yu
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

  • nanomaterials
  • low-dimensional materials
  • nanocomposites
  • nanomechanics
  • micromechanics
  • nanoindentation
  • atomic force microscopy
  • computational mechanics
  • molecular dynamics
  • density functional theory

Published Papers (4 papers)

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Research

17 pages, 5483 KiB  
Article
Combining Machine Learning and Molecular Dynamics to Predict Mechanical Properties and Microstructural Evolution of FeNiCrCoCu High-Entropy Alloys
by Jingui Yu, Faping Yu, Qiang Fu, Gang Zhao, Caiyun Gong, Mingchao Wang and Qiaoxin Zhang
Nanomaterials 2023, 13(6), 968; https://doi.org/10.3390/nano13060968 - 7 Mar 2023
Cited by 3 | Viewed by 2606
Abstract
Compared with traditional alloys, high-entropy alloys have better mechanical properties and corrosion resistance. However, their mechanical properties and microstructural evolution behavior are unclear due to their complex composition. Machine learning has powerful data processing and analysis capabilities, that provides technical advantages for in-depth [...] Read more.
Compared with traditional alloys, high-entropy alloys have better mechanical properties and corrosion resistance. However, their mechanical properties and microstructural evolution behavior are unclear due to their complex composition. Machine learning has powerful data processing and analysis capabilities, that provides technical advantages for in-depth study of the mechanical properties of high-entropy alloys. Thus, we combined machine learning and molecular dynamics to predict the mechanical properties of FeNiCrCoCu high-entropy alloys. The optimal multiple linear regression machine learning algorithm predicts that the optimal composition is Fe33Ni32Cr11Co11Cu13 high-entropy alloy, with a tensile strength of 28.25 GPa. Furthermore, molecular dynamics is used to verify the predicted mechanical properties of high-entropy alloys, and it is found that the error between the tensile strength predicted by machine learning and the tensile strength obtained by molecular dynamics simulation is within 0.5%. Moreover, the tensile-compression asymmetry of Fe33Ni32Cr11Co11Cu13 high-entropy alloy increased with the increase of temperature and Cu content and the decrease of Fe content. This is due to the increase in stress caused by twinning during compression and the decrease in stress due to dislocation slip during stretching. Interestingly, high-entropy alloy coatings reduce the tensile-compression asymmetry of nickel; this is attributed to the reduced influence of dislocations and twinning at the interface between the high-entropy alloy and the nickel matrix. Full article
(This article belongs to the Special Issue Mechanics of Nanomaterials and Low-Dimensional Materials)
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12 pages, 3374 KiB  
Article
Cyclic Buckling Characterization of an Individual MWCNT Using Quantitative In Situ TEM Axial Compression
by Raz Samira, Adam Cohen, Fernando Patolsky and Noa Lachman
Nanomaterials 2023, 13(2), 301; https://doi.org/10.3390/nano13020301 - 11 Jan 2023
Cited by 1 | Viewed by 1272
Abstract
Carbon nanotubes (CNTs) are extremely conductive and flexible, making them ideal for applications such as flexible electronics and nanoelectromechanical systems. However, in order to properly apply them in such devices, their long-term durability must be assessed. In the present study, we demonstrate cyclic [...] Read more.
Carbon nanotubes (CNTs) are extremely conductive and flexible, making them ideal for applications such as flexible electronics and nanoelectromechanical systems. However, in order to properly apply them in such devices, their long-term durability must be assessed. In the present study, we demonstrate cyclic loading of a thick MWCNT (175 nm) under axial compression, observed in situ under a transmission electron microscope (TEM). The force was applied via controlled displacement, while real-time TEM videos of the deformation process were gathered to produce the morphological data. The in situ observations combined with force–displacement curves revealed the onset of buckling instabilities, and the elastic limits of the tube were assessed. The MWCNT retained its original structure even after 68 loading–unloading cycles, despite observed clues for structural distortions. The stiffness of the tube, calculated after each loading cycle, was in a 0.15 to 0.28 TPa range—comparable to the literature, which further validates the measurement set-up. These in situ tests demonstrate the resilience of CNTs to fatigue which can be correlated with the CNTs’ structure. Such correlations can help tailoring CNTs’ properties to specific applications. Full article
(This article belongs to the Special Issue Mechanics of Nanomaterials and Low-Dimensional Materials)
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10 pages, 2456 KiB  
Article
Ultrafast Charge Carrier Dynamics in InP/ZnSe/ZnS Core/Shell/Shell Quantum Dots
by Shijia Zeng, Zhenbo Li, Wenjiang Tan, Jinhai Si, Yuren Li and Xun Hou
Nanomaterials 2022, 12(21), 3817; https://doi.org/10.3390/nano12213817 - 28 Oct 2022
Cited by 4 | Viewed by 1640
Abstract
The excellent performance of InP/ZnSe/ZnS core/shell/shell quantum dots (CSS-QDs) in light-emitting diodes benefits from the introduction of a ZnSe midshell. Understanding the changes of ultrafast carrier dynamics caused by the ZnSe midshell is important for their optoelectronic applications. Herein, we have compared the [...] Read more.
The excellent performance of InP/ZnSe/ZnS core/shell/shell quantum dots (CSS-QDs) in light-emitting diodes benefits from the introduction of a ZnSe midshell. Understanding the changes of ultrafast carrier dynamics caused by the ZnSe midshell is important for their optoelectronic applications. Herein, we have compared the ultrafast carrier dynamics in CSS-QDs and InP/ZnS core/shell QDs (CS-QDs) using femtosecond transient absorption spectroscopy. The results show that the ZnSe midshell intensifies the electron delocalization and prolongs the in-band relaxation time of electrons from 238 fs to 350 fs, and that of holes from hundreds of femtoseconds to 1.6 ps. We also found that the trapping time caused by deep defects increased from 25.6 ps to 76 ps, and there were significantly reduced defect emissions in CSS-QDs. Moreover, the ZnSe midshell leads to a significantly increased density of higher-energy hole states above the valence band-edge, which may reduce the probability of Auger recombination caused by the positive trion. This work enhances our understanding of the excellent performance of the CSS-QDs applied to light-emitting diodes, and is likely to be helpful for the further optimization and design of optoelectronic devices based on the CSS-QDs. Full article
(This article belongs to the Special Issue Mechanics of Nanomaterials and Low-Dimensional Materials)
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9 pages, 2534 KiB  
Article
Effect of Hydrophobic Nano-SiO2 Particle Concentration on Wetting Properties of Superhydrophobic Surfaces
by Lei Xing, Tian Xia and Qiaoxin Zhang
Nanomaterials 2022, 12(19), 3370; https://doi.org/10.3390/nano12193370 - 27 Sep 2022
Cited by 5 | Viewed by 1654
Abstract
As a unique surface wettability, superhydrophobicity has great application value. A variety of preparation methods for superhydrophobic surfaces have been reported, which have the disadvantages of high cost and complicated process. In order to design a method that is easy to operate, low-cost, [...] Read more.
As a unique surface wettability, superhydrophobicity has great application value. A variety of preparation methods for superhydrophobic surfaces have been reported, which have the disadvantages of high cost and complicated process. In order to design a method that is easy to operate, low-cost, and suitable for large-scale preparation of superhydrophobic surfaces, in this paper, hydrophobic nano-SiO2 particles are used as spray fillers, and superhydrophobic surfaces are successfully obtained by the spraying process. According to the classical Cassie and Wenzel theory, the influence of the concentration change of hydrophobic nano-SiO2 particles on their wettability is explained, and the appropriate spray concentration parameters are obtained. The results show that the proportion of hydrophobic nano-SiO2 particles is lower than 0.05 g/mL, which will lead to insufficient microstructure on the surface of the coating, and cannot support the droplets to form the air bottom layer. However, an excessively high proportion of hydrophobic nano-SiO2 particles will reduce the connection effect of the silicone resin and affect the durability of the surface. Through theoretical analysis, there are Wenzel state, tiled Cassie state, and stacked Cassie state in the spraying process. When the substrate surface enters the Cassie state, the lower limit of the contact angle is 149°. This study has far-reaching implications for advancing the practical application of superhydrophobic surfaces. Full article
(This article belongs to the Special Issue Mechanics of Nanomaterials and Low-Dimensional Materials)
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