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CONTENTS
Volume 16, Number 1, January 2024
 

Abstract
SiO2-coated magnetic nanoparticles (Fe3O4@SiO2 NPs) were modified by 3-nitrobenzelidenmalononitrile and used as green linkages for removal of Hg2+ form the wastewater. In this research, it has been attempted to refer to the harmful effects of mercury ions for living things and how to remove such ions using very easy and practical technique. This study shows that by optimizing the test conditions, the efficiency of the removal of harmful ions such as mercury from the water contaminated with these ions can be increased. Conditions such as temperature, speed of agitation, pH of solution were tested for removal of mercury ions. The advantages of this method over other methods listed in the article are the rapid and easy nanocry synthesis. The generated and modified Fe3O4@SiO2 nanoparticles were characterized by X-ray diffraction, fourier transform infrared and scanning electron microscopy spectroscopy. The results show that the synthesized magnetic nanoparticles have the excellent performance for the removal of mercury(II) ion from the waste water.

Key Words
mercury(II) ion removal; modified magnetic nanoparticles; 3-nitrobenzelidenemalononitrile

Address
Mosleh Mehryar: Department of Applied Chemistry, Faculty of Chemistry, Urmia University, Urmia, Iran

Ghasem Marandi: Department of Organic Chemistry, Faculty of Chemistry, Urmia University, Urmia, Iran

Abstract
In this study, free vibration analysis of FG porous spherical cap reinforced by graphene platelets resting on Winkler-type elastic foundation has been surveyed for the first time. Three different types of porosity patterns are considered for the spherical cap whose two types of porosity patterns in the metal matrix are symmetric and the other one is uniform. Besides, five GPL patterns are assumed for dispersing of GPLs in the metal matrix. Tsai-Halpin and extended rule of the mixture are used to determine the Young modulus and mass density of the shell, respectively. Employing 3D FEM elasticity in conjunction with Hamilton's Principle, the governing motion equations of the structure are obtained and solved. The impact of various parameters including porosity coefficient, various porosity distributions in conjunction with different GPL patterns, the weight fraction of graphene Nano fillers, polar angles and stiffness coefficient of elastic foundation on natural frequencies of FG porous spherical cap reinforced by GPLs have been reported for the first time.

Key Words
FEM; functionally graded porous; graphene platelets; spherical cap; natural frequency; Winkler elastic foundation; 3D elasticity

Address
Xiangqian Shen, Tong Li and Lei Xu: XiHua University, Chengdu 610039, China

Faraz Kiarasi and Masoud Babaei: Department of Mechanical Engineering, University of Eyvanekey, Eyvanekey, Semnan, Iran

Kamran Asemi: Department of Mechanical Engineering, Islamic Azad University, North Tehran Branch, Tehran, Iran

Abstract
This work is the first of its kind to integrate Mindlin's theory with analytical methods in order to produce an exact solution to a specific vibration issue as well as a bending problem involving a nanoplate that is supported by a viscoelastic foundation. The plate is exposed to the simultaneous effects of a compressive load in the plate plane and a force operating perpendicular to the plane of the nanoplate. In addition, the flexoelecity effect is included into the plate. The strain gradient component is taken into consideration while calculating the plate equilibrium equation using the nonlocal theory and Hamilton's principle. The free vibration and static responses of the nanoplate seem to be both real and imaginary components because of the appearance of the viscoelastic drag coefficient of the viscoelastic foundation. This study also shows that when analyzing the mechanical response for nanostructure, taking into account the flexoelectricity effect and the influence of the nonlocal parameter, the results will be completely different from the case in which this parameter is ignored. This indicates that it is vital to take into consideration the effects of nonlocal parameters on the nanosheet structure while also taking into consideration the effect of flexoelectricity.

Key Words
analytical method; bending; flexoelectricity; free vibration; nanoplates; viscoelastic foundation

Address
Pham Ba Khien: HUTECH institute of Engineering, HUTECH University, Ho Chi Minh, Vietnam

Du Dinh Nguyen: Faculty of Civil Engineering, Lac Hong University, Dong Nai Province, Viet Nam

Abdelouahed Tounsi: Department of Civil and Environmental Engineering, King Fahd University of Petroleum & Minerals, 31261 Dhahran, Eastern Province, Saudi Arabia/ Material and Hydrology Laboratory, University of Sidi Bel Abbes, Faculty of Technology, Civil Engineering Department, Algeria/ Department of Civil and Environmental Engineering, Lebanese American University, 309 Bassil Building, Byblos, Lebanon/ YFL (Yonsei Frontier Lab), Yonsei University, Seoul, Korea

Bui Van Tuyen: Faculty of Mechanical Engineering, Thuyloi University, 175 Tay Son, Dong Da, Hanoi, Vietnam

Abstract
In this study, rare-earth orthoferrites LnFeO3 were synthesized using a facile hydrothermal reaction and their visible-light-induced photo-Fenton degradation of organics was optimized through Ln variation (Ln = La, Pr, or Gd). The morphological, structural, and chemical characteristics of as-prepared samples were examined in detail by using different methods, including XRD, SEM, TEM, XPS, etc. On the other side, under visible light illumination, the photo-Fenton-like catalytic activities of LnFeO3 were assessed in terms of the removal of selected organic models, i.e., pharmaceuticals (ketoprofen and tetracycline) and dyes (rhodamine B and methyl orange). As compared with PrFeO3 or GdFeO3, the sample of LaFeO3 displayed more structural distortion, larger specific surface area, and narrower band gap, resulting in its higher photo-Fenton-like catalytic activity toward the degradation of organics. In organic-containing solution, in which the initial solution pH = 5, catalyst dosage = 1 g/L and H2O2 concentration = 10 mM, 98.2% of rhodamine B, 31.1% of methyl orange, 67.7% of ketoprofen, or 96.4% of tetracycline was removed after 90-min exposure to simulated visible light. Our findings revealed that variation of Ln site on rare-earth orthoferrites was an effective strategy for optimizing their organic removal via visible-light-induced photo-Fenton reaction.

Key Words
dye; pharmaceutical; photo-Fenton; rare-earth orthoferrite

Address
Thi T. N. Phan: College of Science, Technology, Engineering & Mathematics, Murdoch University, Murdoch, WA, Australia/ Department of Organic and Petrochemical Technology, School of Chemical Engineering, Hanoi University of Science and Technology, Ha Noi, Viet Nam

Aleksandar N. Nikoloski, Parisa A. Bahri and Dan Li: College of Science, Technology, Engineering & Mathematics, Murdoch University, Murdoch, WA, Australia

Abstract
Advancements in the technology of building materials has led to diverse applications of nanomaterials with the aim to monitor concrete structures. While there are myriad instances of the use of nanoparticles in building materials, the production of smart nano cement-composites is often expensive. Thereupon, this research aims to discover a sustainable nanomaterial from tyre waste using the pyrolysis process as part of the green manufacturing circle. Here, Nano Structure Tyre-Char (NSTC) is introduced as a zero-dimension carbon-based nanoparticle. The NSTC particles were characterized using various standard characterization techniques. Several salient results for the NSTC particles were obtained using microscopic and spectroscopic techniques. The size of the particles as well as that of the agglomerates were reduced significantly using the milling process and the results were validated through a scanning electron microscope. The crystallite size and crystallinity were found to be ~35nm and 10.42%, respectively. The direct bandgap value of 5.93eV and good optical conductivity at 786 nm were obtained from the ultra violet visible spectroscopy measurements. The thermal analysis reveals the presence of a substantial amount of carbon, the rate of maximum weight loss, and the two stages of phase transformation. The FT-Raman confirms the presence of carboxyl groups and a ID/IG ratio of 0.83. Water contact angle around 140º on the surface implies the highly hydrophobic nature of the material and its low surface energy. This characteristic process assists to obtain a sustainable nanomaterial from waste tyres, contributing to the development of a smart building material.

Key Words
characterization; microscopic; spectroscopic; sustainable nanomaterial; waste tyre

Address
N. K. Karthikeyan and S. Elavenil: School of Civil Engineering, Vellore Institute of Technology, Chennai-campus, Vandalur – kelambakkam road, Chennai 600127, India

Abstract
Nanotechnology is the latest technology developed by humanity, trying to use the molecular properties of materials found in nature to create devices that solve the problems plaguing humanity and their efficiency. Man is also trying to change the meaning of molecules to nano so that a body made up of these particles has all the properties of these particles. Nanotechnology is not a new field but a new approach in all areas. A new perspective in concrete technology has been created by the use of nanoparticles in recent years. Adding silica nanoparticles to concrete mixes improves its properties and increases its strength. However, different results and reported mechanisms explain the behavior of nanoparticles in the mixture; Therefore, it took much work to generalize the results and predict the behavior of nano concretes. This article is about the construction simulation technology of civil engineering based on artificial intelligence, which deals with the effect of nanoparticles on improving concrete properties. This was demonstrated by analyzing laboratory samples in various mixture configurations and observing how silica nanoparticles affected their microstructure with scanning electron microscopy (SEM). Based on SEM measurements, silica nanoparticles have a powerful effect because of their specific surface area. Their increase and decrease must be sought in interacting with the filling and nucleation mechanism and the pozzolanic activity. Each of these mechanisms dominates at different ages of hydration and affects the microstructure and mechanical properties of concrete.

Key Words
artificial intelligence; concrete; nanoparticles; nanotechnology; silica; structure engineering

Address
Zhongkuo Zhang: School of Civil Engineering, Yancheng Institute of Technology, Yancheng 224051, Jiangsu, China

Jie Ren: School of Architecture, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia, China

Abstract
In the oil and gas industry, composite materials should exhibit high flexibility and strength for offshore structures. Therefore, weak points in the composites should be improved, such as brittleness, moisture penetration, and diffusion of detrimental ions into nanometric pores. This study aimed to increase the strength, flexibility, and plugging of nanopores using single-layer graphene oxide (SGO) nanosheets. Therefore, SGO is added to unsaturated polyester resin at concentrations of 0.015 and 0.15 % with Normal Methyl Pyrrolidone (NMP) as a solvent for the formation of Nanographene Oxide Reinforced Polymer (NGORP). The mechanical properties of the prepared samples were tested using tensile testing (ASTM-D 638). It has been shown that incorporating SGO, approximately 0.015%, into the base resin resulted in enhanced properties such as rupture resistance forces increased by 745.61 N, applied stress tolerances increased by 4.1 MPa, longitude increased to 1.58 mm, elongation increased by about 2.38%, and rupture energy increased by about 204.51 J. Despite the decrease in tensile force strength properties in the manufactured nanocomposite with 0.15% SGO, it has exclusive flexibility properties such as a high required energy level for rupture of 5,576 times and a formability of 40% more than the base sample. It would be best to use NGORP manufactured from 0.015% nanosheets with exclusive properties rather than base samples for constructing parts and equipment, such as rebars, composite sheets, and transmission pipes, on offshore platforms.

Key Words
flexibility; graphene oxide nanosheets; mechanical strength; nanocomposite; offshore platform

Address
Vahid Zarei: Department of Petroleum and Chemical Engineering, Science and Research Branch, Islamic Azad University (IAU), Tehran 1477893855, Iran/ Department of Materials Science and Engineering, School of Engineering, Shiraz University, Zand Ave, Shiraz, Iran


Abstract
Carbon nanotubes are drawing wide attention of research communities and several industries due to their versatile capabilities covering mechanical and other multi-physical properties. However, owing to extreme operating conditions of the synthesis process of these nanostructures, they are often imposed with certain inevitable structural deformities such as single vacancy and nanopore defects. These random irregularities limit the intended functionalities of carbon nanotubes severely. In this article, we investigate the mechanical behaviour of double-wall carbon nanotubes (DWCNT) under the influence of arbitrarily distributed single vacancy and nanopore defects in the outer wall, inner wall, and both the walls. Large-scale molecular simulations reveal that the nanopore defects have more detrimental effects on the mechanical behaviour of DWCNTs, while the defects in the inner wall of DWCNTs make the nanostructures more vulnerable to withstand high longitudinal deformation. From a different perspective, to exploit the mechanics of damage for achieving defect-induced shape modulation and region-wise deformation control, we have further explored the localized longitudinal and transverse spatial effects of DWCNT by designing the defects for their regional distribution. The comprehensive numerical results of the present study would lead to the characterization of the critical mechanical properties of DWCNTs under the presence of inevitable intrinsic defects along with the aspect of defect-induced spatial modulation of shapes for prospective applications in a range of nano-electromechanical systems and devices.

Key Words
defect engineering; defect-induced shape modulation; detective DWCNTs; double-wall carbon nanotubes; nanopore defects; single vacancy defect

Address
A. Roy and S. Dey: Department of Mechanical Engineering, National Institute of Technology Silchar, Silchar, India

K. K. Gupta: Amrita School of Artificial Intelligence, Amrita Vishwa Vidyapeetham, Coimbatore, India

T. Mukhopadhyay: Department of Aeronautics and Astronautics, University of Southampton, Southampton, UK

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