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Nanomaterials
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Mechanics of Micro/Nano Structures and Materials, Volume II
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Mechanics of Micro/Nano Structures and Materials, Volume II

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

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 7044

Special Issue Editors

Prof. Dr. Rosa Penna

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Guest Editor
Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
Interests: composites and nano-composite materials; experimental investigation of composites materials (FRP); computational mechanics; multiscale numerical modeling and simulation of materials and structures; structural rehabilitation of masonry and reinforced concrete structures with FRP; full FRP composite structures; connections in composites structures; durability of high-performance fiber-reinforced concrete (HPFRC); concrete; rubber-like materials; nonlinear mechanics; additive manufacturing; polymer-fiber composites; sustainability
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Luciano Feo

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Guest Editor
Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
Interests: composites and nano-composites materials; experimental investigation of composites materials (FRP); computational mechanics; multiscale numerical modeling and simulation of materials and structures; computational design and engineering of innovative sustainable materials and infrastructures; structural rehabilitation of masonry and concrete structures with FRP; full FRP composite structures; connections in composites structures; durability of high-performance fiber reinforced concrete (HPFRC)
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Francesco Fabbrocino

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Guest Editor
Department of Engineering, Telematic University Pegaso, Piazza Trieste e Trento, 48, 80132 Naples, Italy
Interests: composite materials; masonry structures; numerical modeling; mechanical engineering; bridge engineering; modal analysis; dynamics; civil engineering; materials engineering; experimental characterization; concrete durability
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Micro/nanoscale structures, in all their forms, are a new generation of small-scale structures with a wide range of potential applications in several fields of nanotechnology and nanoscience. In order to achieve micro/nanoelectromechanical systems (NEMS/MEMs) with enhanced functionality, the main structural components more and more often are made from functionally graded (FG) materials. Composites made from FG materials (FGMs) or reinforced through functionally graded carbon nanotubes (FG-CNTs) are a novel type of composite materials designed and fabricated in such a way that their mechanical, electronic, and thermal properties vary gradually in preferred spatial directions so that problems related to material discontinuities can be significantly reduced and high permeance requirements catered to. Among these engineering nanostructures, nanobeams have attracted more attention due to their engineering applications such as in nanoactuators, nanosensors, and atomic force microscopes (AFMs). Additive manufacturing or 3D printing is another emerging technology that has quickly gained attention in several industrial fields, paving the way for a whole new dimension of opportunities in manufacturing technology.

Volume II of this Special Issue will be a peer-reviewed forum for the publication of original papers dealing with the most important issues regarding the mechanics of micro- and nanostructures and -materials and their application in the design of innovative materials and structures, as well as capturing scientific advancements in the design and development of sustainable polymer-fiber composites, mainly for building applications, through the use of additive manufacturing or 3D printing technology.

Potential topics include, but are not limited to, the following: experimental and computational techniques in nanotechnology and nanoscience; nonlocal elasticity; nanoelectromechanical systems (NEMS) and microelectromechanical systems (MEMS); bending; buckling; nonlinear free vibration; functionally graded (FG) sandwich nanobeams and nanoplates; strain and stress gradient models; concrete; rubber-like materials; nonlinear mechanics; additive manufacturing; polymer-fiber composites; and sustainability.

Prof. Dr. Rosa Penna
Prof. Dr. Luciano Feo
Prof. Dr. Francesco Fabbrocino
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

  • experimental and computational techniques in nanotechnology and nanoscience
  • nonlocal elasticity
  • nanoelectromechanical systems (NEMS) and microelectromechanical systems (MEMS)
  • bending
  • buckling
  • nonlinear free vibration
  • functionally graded (FG) sandwich nanobeams and nanoplates
  • strain and stress gradient models
  • concrete
  • rubber-like materials
  • nonlinear mechanics
  • additive manufacturing
  • polymer-fiber composites
  • sustainability

Published Papers (3 papers)

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Research

17 pages, 2561 KiB  
Article
Application of Surface Stress-Driven Model for Higher Vibration Modes of Functionally Graded Nanobeams
by Giuseppe Lovisi, Luciano Feo, Annavirginia Lambiase and Rosa Penna
Nanomaterials 2024, 14(4), 350; https://doi.org/10.3390/nano14040350 - 12 Feb 2024
Viewed by 695
Abstract
This paper employs a surface stress-driven nonlocal theory to investigate the synergistic impact of long-range interaction and surface energy on higher vibration modes of Bernoulli–Euler nanobeams made of functionally graded material. It takes into account surface effects such as the surface modulus of [...] Read more.
This paper employs a surface stress-driven nonlocal theory to investigate the synergistic impact of long-range interaction and surface energy on higher vibration modes of Bernoulli–Euler nanobeams made of functionally graded material. It takes into account surface effects such as the surface modulus of elasticity, residual surface stresses, surface density, and rotary inertia. The governing equation is derived through the application of Hamilton’s principle. The novelty of this work lies in its pioneering approach to studying higher-order vibrations, carefully considering the combination of long-range interactions and surface energy in nanobeams of functionally graded materials through a well-posed mathematical model of nonlocal elasticity. This study conducts a parametric investigation, examining the effects of the nonlocal parameter and the material gradient index for four static schemes: Cantilever, Simply-Supported, Clamped-Pinned and Clamped-Clamped nanobeams. The outcomes are presented and discussed, highlighting the normalized nonlocal natural frequencies for the second through fifth modes of vibration in each case under study. In particular, this study illustrates the central role of surface effects in the dynamic response of nanobeams, emphasizing the importance of considering them. Furthermore, the parametric analysis reveals that the dynamic response is influenced by the combined effects of the nonlocal parameter, the material gradient index, the shapes of the cross-sections considered, as well as the static scheme analyzed. Full article
(This article belongs to the Special Issue Mechanics of Micro/Nano Structures and Materials, Volume II)
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13 pages, 6597 KiB  
Article
Probing Polymorphic Stacking Domains in Mechanically Exfoliated Two-Dimensional Nanosheets Using Atomic Force Microscopy and Ultralow-Frequency Raman Spectroscopy
by Chengjie Pei, Jindong Zhang and Hai Li
Nanomaterials 2024, 14(4), 339; https://doi.org/10.3390/nano14040339 - 09 Feb 2024
Viewed by 820
Abstract
As one of the key features of two-dimensional (2D) layered materials, stacking order has been found to play an important role in modulating the interlayer interactions of 2D materials, potentially affecting their electronic and other properties as a consequence. In this work, ultralow-frequency [...] Read more.
As one of the key features of two-dimensional (2D) layered materials, stacking order has been found to play an important role in modulating the interlayer interactions of 2D materials, potentially affecting their electronic and other properties as a consequence. In this work, ultralow-frequency (ULF) Raman spectroscopy, electrostatic force microscopy (EFM), and high-resolution atomic force microscopy (HR-AFM) were used to systematically study the effect of stacking order on the interlayer interactions as well as electrostatic screening of few-layer polymorphic molybdenum disulfide (MoS2) and molybdenum diselenide (MoSe2) nanosheets. The stacking order difference was first confirmed by measuring the ULF Raman spectrum of the nanosheets with polymorphic stacking domains. The atomic lattice arrangement revealed using HR-AFM also clearly showed a stacking order difference. In addition, EFM phase imaging clearly presented the distribution of the stacking domains in the mechanically exfoliated nanosheets, which could have arisen from electrostatic screening. The results indicate that EFM in combination with ULF Raman spectroscopy could be a simple, fast, and high-resolution method for probing the distribution of polymorphic stacking domains in 2D transition metal dichalcogenide materials. Our work might be promising for correlating the interlayer interactions of TMDC nanosheets with stacking order, a topic of great interest with regard to modulating their optoelectronic properties. Full article
(This article belongs to the Special Issue Mechanics of Micro/Nano Structures and Materials, Volume II)
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17 pages, 11011 KiB  
Article
Nanoscale Insights into the Mechanical Behavior of Interfacial Composite Structures between Calcium Silicate Hydrate/Calcium Hydroxide and Silica
by Jiuye Zhao, Yuanhang Zhang, Dapeng Xue, Chunyi Cui, Wenzheng Li and Fang Liu
Nanomaterials 2023, 13(23), 3059; https://doi.org/10.3390/nano13233059 - 30 Nov 2023
Viewed by 745
Abstract
The failure of the interfacial transition zone has been identified as the primary cause of damage and deterioration in cement-based materials. To further understand the interfacial failure mechanism, interfacial composite structures between the main hydration products of ordinary Portland cement (OPC), calcium silicate [...] Read more.
The failure of the interfacial transition zone has been identified as the primary cause of damage and deterioration in cement-based materials. To further understand the interfacial failure mechanism, interfacial composite structures between the main hydration products of ordinary Portland cement (OPC), calcium silicate hydrate (CSH) and calcium hydroxide (Ca(OH)2), and silica (SiO2) were constructed while considering their anisotropy. Afterwards, uniaxial tensile tests were conducted using molecular dynamics (MD) simulations. Our results showed that the interfacial zones (IZs) of interfacial composite structures tended to have relatively lower densities than those of the bulk, and the anisotropy of the hydration products had almost no effect on the IZ being a low-density zone. Interfacial composite structures with different configurations exhibited diverse nanomechanical behaviors in terms of their ultimate strength, stress–strain relationship and fracture evaluation. A higher strain rate contributed to a higher ultimate strength and a more prolonged decline in the residual strength. In the interfacial composite structures, both CSH and Ca(OH)2 exhibited ruptures of the Ca-O bond as the primary atomic pair during the tensile process. The plastic damage characteristics of the interfacial composite structures during the tensile process were assessed by analyzing the normalized number of broken Ca-O bonds, which also aligned with the atomic chain break characteristics evident in the per-atom stress map. Full article
(This article belongs to the Special Issue Mechanics of Micro/Nano Structures and Materials, Volume II)
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