Nanomaterials Science & Engineering
type: channel
publisher: UA Editora
language: en
publication name: Nanomaterials Science & Engineering
issn: 2184-7002
copyright: Copyright Information Authors who publish in the Nanomaterials Science & Engineering agree to the following terms: - Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal. - Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal. - Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) after publication, as it can lead to productive exchanges, as well as earlier and greater citation of published work. Copyrights to illustrations published in the journal remain with their current copyright holders. It is the author's responsibility to obtain permission to quote from copyright sources. Any fees required to obtain illustrations or to secure copyright permissions are the responsibility of authors.
items: An Innovative Approach to Wound Dressings: Citric Acid Cross-linked Carboxymethylcellulose-Poly(vinyl alcohol) Hydrogels with Variable Pore Sizes
items: Investigation of Damping in Porous Metal Foams
items: The influence of T-Shape flow deflector placement on convection heat transfer over an array heated blocks
items: Nanomaterials Science & Engineering (NMS&E), Vol.7, No.1, 2025
items: Nanostructures and applications
items: The effects of black tea extracts on the corrosion inhibition of mild steel in acidic solution
items: Impurity and Vacancy analysis in Zig-Zag (8,0) carbon nanotubes
items: Nanomaterials Science & Engineering, Volume 6, Number 1, May 2024
items: Nanomaterials Science & Engineering, Volume 5, Number 1, October 2023
items: Comparison of the cyclic voltammetry of benzene-1,2-diol and benzene-1,2,3-triol and their ability to form films on the carbon working electrode after a single potential sweep cycle
items: Local piezoelectric properties of Di-Leucine dipeptides nanotubes
items: Synthesis and characterization of multiferroic magnetoelectric ceramic composites
items: Tunnel magnetoresistance of granular superparamagnetic and ferrimagnetic structures
items: Synthesis and structural Characterization of Cu Substituted SrCoO3-δ Perovskite Oxides
items: Conductivity and transmittance enhancement of PEDOT:PSS thin films by graphene addition
items: Nanomaterials Science & Engineering, Volume 4, Number 1, December 2022
items: YAG:Ag nanophosphors – synthesis and characterization
items: Antimony-lead melts for high temperature electrochemical applications
items: Magnetic Field, Heat Transfer and Rheological Analysis of a Magnetorheometer using Finite Element Method
items: Nanomaterials Science & Engineering, Volume 3, Number 2, December 2021
items: Polarization switching in PVDF ferroelectric polymer composites containing graphene layers: molecular dynamic simulations
items: Method for determining the chirality sign of peptide nanotubes using the dipole moments vectors calculations
items: Facile Hydrothermal Synthesis of CoFe2O4/Co3O4 Nanostructures for Efficient Oxygen Evolution Reaction
items: Nanomaterials Science & Engineering, Volume 3, Number 1, March 2021
items: Photocatalytic degradation of organic pollutant using TiO2/rGO nanocomposites under simulated sunlight
items: Modeling of the 2D-materials hybrid nanostructures based on ferroelectric polymer PVDF/P(VDF-TrFE) and MoS2 Dichalcogenide
items: Improved performance of Silicon solar cells by ZnMgO front laye
items: Hybrid microwave sintering of alumina ceramics which contain waste alumina
items: Crystal structure and magnetic properties of Bi1-xSmxFeO3 ceramics across the phase boundary: effect of high pressure
items: Carbon fibber reinforced polymer use in space launch vehicle propellant tanks - concept and finite element method study

An Innovative Approach to Wound Dressings: Citric Acid Cross-linked Carboxymethylcellulose-Poly(vinyl alcohol) Hydrogels with Variable Pore Sizes
type: item
description: Polyvinyl alcohol (PVA)/carboxymethyl cellulose (CMC) hydrogels were fabricated with varying concentrations of CMC. The hydrogels underwent cross-linking using non-toxic and biocompatible citric acid (CA) in combination with the freeze-thaw technique. FTIR analysis confirmed the hydrogels' chemical structures, while SEM characterization determined their pore diameters and porosity ratios. Hydrogels with diverse porosities exhibited suitable pore diameters for skin cells. Moreover, the hydrogels demonstrated a high swelling capacity, and the augmentation of CMC content resulted in increased water retention capacity. Their water vapor transmission, combined with their swelling properties, highlights their potential as suitable materials for use in wound dressings. These biopolymer-based hydrogels show promise for various applications, including wound dressings and biomimetic artificial skin, effectively replicating the properties of the epidermis and dermis.
subject: Articles
  topic: section
subject: Carboxymethylcellulose
  topic: keywords
subject: Hydrogels
  topic: keywords
subject: Mimicking Dermis
  topic: keywords
subject: Wound Dressings
  topic: keywords
subject: Porosity
  topic: keywords
creator: Yağmur Camcı
creator: Serbülent Türk
creator: Mahmut Özacar
rights: Copyright (c) 2025 Nanomaterials Science & Engineering
date: 2025-01-16
publication date: 2025-01-16
starting page: 5
ending page: 13
doi: 10.34624/nmse.v7i1.37480

Investigation of Damping in Porous Metal Foams
type: item
description: Damping in materials and structure is known by the dissipation of energy over time under eventual action of an excitation called force. It is crucial characteristics in various engineering applications including civil engineering, mechanical engineering and aerospace engineering. It contributes to the safety, performances and longevity of these structures as well as the designed damping systems can improve the comfort and reliability of a wide range of engineering applications from everyday vehicles and machine to large scale engineering projects. The aim of this paper is to investigate damping mechanism in porous metal foams, the influence of different parameter such as porosity and microstructure on the damping phenomena and some practical implications. This research unlocks full potential of metal foams for vibration control and energy dissipation, advancing engineering solutions for a wide range of industries.
subject: Articles
  topic: section
subject: damping
  topic: keywords
subject: porous metal foams
  topic: keywords
subject: microstructure
  topic: keywords
subject: porosity
  topic: keywords
creator: Bilal FETTAH
creator: Hamou ZAHLOUL
rights: Copyright (c) 2025 Nanomaterials Science & Engineering
date: 2025-01-17
publication date: 2025-01-17
starting page: 14
ending page: 19
doi: 10.34624/nmse.v7i1.37198

The influence of T-Shape flow deflector placement on convection heat transfer over an array heated blocks
type: item
description: In this research, a numerical study was conducted to examine the convective heat transfer in a horizontal channel containing multiple heated blocks. The channel design incorporates T-shaped flow deflectors strategically positioned downstream of each block. Air, with a Prandtl number of 0.71 and consistent thermal properties, is used for cooling. The geometric attributes and arrangement of the flow deflectors remain consistent throughout the analysis. The computations are based on a Reynolds number of 400, with systematic variations in the positions of the flow deflectors. The finite volume method, implemented using Ansys Fluent© software, is employed to solve the governing mathematical equations numerically. The results emphasize the significant impact of adjustments to the flow deflector configuration on both fluid flow patterns and heat transfer characteristics across the heated blocks.
subject: Articles
  topic: section
subject: Electronic cooling
  topic: keywords
subject: Finite volume method
  topic: keywords
subject: heated blocks
  topic: keywords
subject: heat transfer enhancement
  topic: keywords
creator: AMIRAT Hamza
creator: KORICHI Abdelkader
creator: AMIRAT Moustapha
rights: Copyright (c) 2025 Nanomaterials Science & Engineering
date: 2025-01-17
publication date: 2025-01-17
starting page: 20
ending page: 25
doi: 10.34624/nmse.v7i1.37201

Nanomaterials Science & Engineering (NMS&E), Vol.7, No.1, 2025
type: item
subject: Full Text
  topic: section
creator: Igor Bdikin
creator: Paula Marques
creator: Duncan Paul Fagg
creator: Gil Gonçalves
rights: Copyright (c) 2025 Nanomaterials Science & Engineering
date: 2025-01-21
publication date: 2025-01-21
starting page: 1
ending page: 27
doi: 10.34624/nmse.v7i1.38948

Nanostructures and applications
type: item
description: Nanotechnology is an interdisciplinary area that studies materials and structures of billionths in size and their uses. Nanomaterials are the keystones of nanotechnology and have exclusive electrical, magnetic and optical properties. What makes nanotechnology so stimulating is that materials perform contrarily in this dimension than in the macro world. The weight/power proportion, magnetic and optical possessions as well as conductivity alter meaningfully as you change from the macro dimension to the nano dimension. In this investigation, after giving overall data about nanomaterials, nanosystems, nanomachines, nanorobots and nanosystems from nanostructures were examined. Then, from nanostructure applications to the automotive industry, energy. defense and environmental applications were examined. Finally, nanofuture for nanostructures is discussed.
subject: Articles
  topic: section
subject: Nanostructures
  topic: keywords
subject: nanotechnology
  topic: keywords
subject: nano-machines
  topic: keywords
subject: nano-sensors
  topic: keywords
subject: applications
  topic: keywords
creator: Fehim Findik
rights: Copyright (c) 2024 Nanomaterials Science & Engineering
date: 2024-05-06
publication date: 2024-05-06
starting page: 5
ending page: 18
doi: 10.34624/nmse.v6i1.35557

The effects of black tea extracts on the corrosion inhibition of mild steel in acidic solution
type: item
description: It was examined to evaluate the effectiveness of extracted tea leaves as the green corrosion inhibitor that contains mild steel in acidic solvents. The test specimens were dissolved in an acidic solution with different concentrations of the extracted tea leaves. After 3 hours of immersion, the corrosion rate (CR) was measured. The results showed that a concentration of 1000 mg/l caused a significant inhibition in corrosion rate as compared to control. To see how black tea (BT) extract affected mild steel corrosion in 1 M HCl, it was subjected to a loss of weight procedure. The corrosion level and the inhibitor's performance were examined at five different BT extract concentrations that included 0.4, 1, 1.4, 2, and 2.4 g/l. According to the findings, an increase in BT concentration at every temperature decreased CR. As a result of the rise in kinetic activities of the metal surface interface, typically, temperature elevation leads to an increase in CR at every concentration of BT extract. The study's findings showed that adding 2.4 g/l of inhibition efficiency resulted in a temperature of 323 K, resulting in 84.95% inhibition efficiency. The small activation energy (Ea) of 8.74 and 11.45 kJ/mole reflected the barrier layer properties of BT extract and its chemical interactions on mild steel surfaces. The thermodynamic parameter revealed the spontaneous interaction between BT extract species and steel surface as kad rose from 0.929 to 1.728 (g/l)-1.
subject: Articles
  topic: section
subject: corrosion rate
  topic: keywords
subject: mild steel
  topic: keywords
subject: inhibitive efficiency
  topic: keywords
subject: green inhibitor
  topic: keywords
subject: thermodynamic parameter
  topic: keywords
creator: Wasan A. Alkaron
creator: Alaa Almansoori
rights: Copyright (c) 2024 Nanomaterials Science & Engineering
date: 2024-05-06
publication date: 2024-05-06
starting page: 19
ending page: 26
doi: 10.34624/nmse.v6i1.35563

Impurity and Vacancy analysis in Zig-Zag (8,0) carbon nanotubes
type: item
description: Nanoscience and nanotechnology have generated billions of dollars annually, generating jobs and new products. This is an area that involves the study and manipulation of nanoscale materials (nanomaterials, on the order of 10-9 m). One class of nanomaterials that has aroused significant interest in the scientific community are those carbon compounds (examples include graphene, carbon nanotubes and fullerenes), especially due to their potential applications in industry. In the present work, we carried out a study on defects (absence of carbon atoms) and Ni doping in the electronic properties of a zigzag carbon nanotube containing 32 carbon atoms. Our results indicated semiconductor behavior when two vacancies are present in the structure and also an increase in the energy level of the conduction band, valence band and Fermi level when the systems are doped with Ni. Finally, for systems doped with Ni, there was a greater probability of charge exchange occurring between the 2p orbitals of carbon and the 2p orbitals of carbon to the 3d orbitals of Nickel.
subject: Articles
  topic: section
creator: Paulo José Pereira de Oliveira
creator: Livia Guimarães de Jesus
creator: Danielly Costa Jekel
creator: Mirielle Rosa de Souza
creator: Fabielle Castelan Marques
rights: Copyright (c) 2024 Nanomaterials Science & Engineering
date: 2024-05-06
publication date: 2024-05-06
starting page: 27
ending page: 37
doi: 10.34624/nmse.v6i1.35515

Nanomaterials Science & Engineering, Volume 6, Number 1, May 2024
type: item
subject: Full Text
  topic: section
creator: Igor Bdikin
creator: Paula Marques
creator: Duncan Paul Fagg
creator: Gil Gonçalves
rights: Copyright (c) 2024 Nanomaterials Science & Engineering
date: 2024-05-13
publication date: 2024-05-13
starting page: 1
ending page: 39
doi: 10.34624/nmse.v6i1.36736

Nanomaterials Science & Engineering, Volume 5, Number 1, October 2023
type: item
subject: Full Text
  topic: section
creator: Igor Bdikin
creator: Paula Marques
creator: Duncan Paul Fagg
creator: Gil Gonçalves
rights: Copyright (c) 2024 Nanomaterials Science & Engineering
date: 2024-04-17
publication date: 2024-04-17
starting page: 1
ending page: 26
doi: 10.34624/nmse.v5i1.36556

Comparison of the cyclic voltammetry of benzene-1,2-diol and benzene-1,2,3-triol and their ability to form films on the carbon working electrode after a single potential sweep cycle
type: item
description: The deposition of thin films on electrode surfaces by methods like cyclic voltammetry (CV) or chronoamperometry was for a long time considered as a drawback owing to the passivation of the electrode and a subsequent reduction in its ability to allow for the determination of electroactive compounds. However, the easy deposition of thin fims from electroactive molecules is also a surface functionalization method. In this article the ability of 1,2-dihydroxybenzene (catechol) and of 1,2,3-trihydroxybenzene (pyrogallol) to form films impermeable to potassium hexacyanoferrate after only one CV « deposition » cycle will be compared. The addition of an additional hydroxyl group on catechol improves the film forming ability in the potential sweep rate window between 1 and 100 mV.s-1. The obtained data will be interpreted in terms of the reversible (mostly for catechol) versus irreversible nature (in the case of pyrogallol) of the « deposition » cycle.
subject: Articles
  topic: section
subject: thin fims
  topic: keywords
subject: chronoamperometry
  topic: keywords
subject: electrochemical deposition
  topic: keywords
subject: cyclic voltammetry
  topic: keywords
creator: Vincent Ball
rights: Copyright (c) 2023 Nanomaterials Science & Engineering
date: 2023-10-03
publication date: 2023-10-03
starting page: 5
ending page: 16
doi: 10.34624/nmse.v5i1.32798

Local piezoelectric properties of Di-Leucine dipeptides nanotubes
type: item
description: Di-Leucine (LL) peptide nanotubes (PNTs) were grown. The local piezoelectric properties of LL PNTs were measured using atomic force microscopy. Using piezoresponse force microscopy the strong piezoelectric properties with d15 ~ 3.2 pm/V was found. The magnitude and distribution of the piezo response signal were analysed depending on the orientation of the tubes. Features of the charge distribution depending on the microstructure of LL PNTs were discovered by Kelvin Probe Force Microscopy.
subject: Articles
  topic: section
subject: dipeptide nanotubes
  topic: keywords
subject: polarization
  topic: keywords
subject: piezoelectricity
  topic: keywords
subject: ferroelectricity
  topic: keywords
creator: Igor Bdikin
rights: Copyright (c) 2023 Nanomaterials Science & Engineering
date: 2023-10-10
publication date: 2023-10-10
starting page: 17
ending page: 24
doi: 10.34624/nmse.v5i1.33484

Synthesis and characterization of multiferroic magnetoelectric ceramic composites
type: item
description: Ceramic composites with composition (1−x)[Ba0.85Ca0.15Zr0.1Ti0.9O3] − x[Ni0.7Zn0.3Fe2O4], (0 ≤ x ≤ 100 wt%) were prepared using solid state route. Structural and microstructural analysis confirmed the coexistence of ferroelectric (BCZT) and magnetostrictive (NZFO) phases without any detectable presence of impurity/secondary phases. The composites exhibited ferroelectric, magnetic properties and magnetoelectric coupling responses. Highest coupling coefficient was obtained for composite with 50 wt% NZFO.
subject: Articles
  topic: section
subject: Multiferroic
  topic: keywords
subject: Magnetoelectric coupling
  topic: keywords
subject: BCZT
  topic: keywords
subject: NZFO
  topic: keywords
creator: Indrani Coondoo
rights: Copyright (c) 2022 Nanomaterials Science & Engineering
date: 2022-12-06
publication date: 2022-12-06
starting page: 5
ending page: 9
doi: 10.34624/nmse.v4i1.30015

Tunnel magnetoresistance of granular superparamagnetic and ferrimagnetic structures
type: item
description: Applicable magnetic sensors based on nanogranular ferromagnetic materials were developed already more than 25 years ago. Since the then, nanotechnology has advanced significantly. New methods for manufacturing agglomerated core-shell structures have emerged. This opens up new possibilities of sensor fabrication and an opportunity for reassessment of the electric and magnetic properties of ideal granular structures. This work represents a comprehensive study of the intergranular resistivity, tunnel magnetoresistance and magnetic field sensibility of superparamagnetic and ferro(ferri)magnetic granular materials. Starting with the tunnel resistance of a granular metal network in which the grains are interconnected by insulating barriers, the tunnel magnetoresistance is calculated under consideration of the temperatures dependencies of magnetization, spin polarization and the magnetic flux dependencies of magnetization and tunnelling barrier height. Granular, superparamagnetic materials show a higher magnetic field sensitivity than ferromagnetic ones. They show a lower temperature coefficient of the tunnel magnetoresistance. Owing to their small magnetic response a higher temperature, superparamagnetic ferrimagnetic oxides are not suitable for application at room temperature. Ferromagnetic nanoparticles possess a high field sensitivity only in a small region of 0.1 to 0.5 T.
subject: Articles
  topic: section
subject: Granular structures
  topic: keywords
subject: superparamagnetic
  topic: keywords
subject: ferromagnetic
  topic: keywords
subject: tunnel magetoresistance
  topic: keywords
creator: Gunnar Suchaneck
rights: Copyright (c) 2022 Nanomaterials Science & Engineering
date: 2022-12-08
publication date: 2022-12-08
starting page: 10
ending page: 20
doi: 10.34624/nmse.v4i1.29956

Synthesis and structural Characterization of Cu Substituted SrCoO3-δ Perovskite Oxides
type: item
description: In this work, SrCo1-xCuxO3-δ perovskite-type metal oxides (x = 0.00, 0.1, 0.2, 0.3) were prepared by sol-gel method using citric acid as chelating agent. We have focused on examining the effect of partial substitution of cobalt by copper on the phase purity and crystallinity of the end products. The samples obtained after calcination at 900°C for 6h were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (IRTF) and powder size distribution (PSD). XRD patterns indicate that a stable perovskite phase with rhombohedral system has been obtained for all the compositions with no detectable secondary phase where the crystallite size ranges from 48.74 to 53.49 nm. The crystallite size decreases with increasing the copper amount. The grain size of oxides as determined from laser diffraction ranges from 0.213 to 0.307 micron, this result reveals that agglomerates are present in the suspension. Infrared spectroscopy shows a broad characteristic band of absorption observed around 581 cm-1 was attributed to the BO (Co-O, Cu-O) stretching vibration.This band is characteristic of the perovskite structure ABO3.
subject: Articles
  topic: section
subject: mixed oxides
  topic: keywords
subject: perovskite
  topic: keywords
subject: sol-gel
  topic: keywords
subject: rombohedral
  topic: keywords
creator: Lynda Djoudi
creator: Belkis Bourmal
creator: Mahmoud Omari
rights: Copyright (c) 2022 Nanomaterials Science & Engineering
date: 2022-12-08
publication date: 2022-12-08
starting page: 21
ending page: 26
doi: 10.34624/nmse.v4i1.29830

Conductivity and transmittance enhancement of PEDOT:PSS thin films by graphene addition
type: item
description: Compared to conventional inorganic semiconductors, organic semiconductors present several advantages, such as cost-effectiveness, mechanical toughness, synthesis versatility and simple production set-ups, among others. In this work, we have prepared conductive solid films based on multilayer graphene (mG) and poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) from liquid dispersions. mG-10.6 wt% dispersion in isopropanol was prepared in two steps. In the first step, graphite was submitted to liquid phase exfoliation in N-methyl-pyrrolidone (NMP) (5.3 wt % of mG), then, in the following step, NMP was removed by precipitation and mG redispersed, using polyethyleneimine and acetic acid-1M in isopropanol, respectively. The nanocomposite films were prepared from dispersions of mG and PEDOT:PSS, by spin-coating, to reach pre-established solid concentrations of 10.2 wt % and 49.9 wt % of mG. The optical and electrical properties of the thin films were characterized using UV-Visible Spectroscopy and an adapted four-probe resistance measurement, while Raman Spectroscopy, Scanning Electron Microscopy (SEM), and Atomic Force Microscopy (AFM) were applied to analyze their morphological features. The thin films showed high transmittances, even multilayer, upholding more than 85% for three-layer films, similar to that found in the single-layer ones. The sheet resistances of the films were detected in the range of a few hundreds of Ω/□. Both transmittance and sheet resistance of the films were improved when compared to those found in pristine mG and pristine PEDOT:PSS, which is due to higher charge mobility in the nanocomposite. Raman Spectroscopy showed the formation of the composite by π-π interaction and the conformational change in the polymer chains was confirmed by peak shift. SEM analysis showed that the films are largely homogeneous, and mG is uniformly dispersed, nevertheless the mG platelets appear to be standing up from the film (AFM). The phase image (AF…
subject: Articles
  topic: section
subject: Nanocomposites
  topic: keywords
subject: Optoelectronics
  topic: keywords
subject: Organic electronics
  topic: keywords
subject: Transparent electrodes
  topic: keywords
creator: Felipe Teixeira Mabilia
creator: Shu Hui Wang
rights: Copyright (c) 2022 Nanomaterials Science & Engineering
date: 2022-12-08
publication date: 2022-12-08
starting page: 27
ending page: 37
doi: 10.34624/nmse.v4i1.29374

Nanomaterials Science & Engineering, Volume 4, Number 1, December 2022
type: item
subject: Full Text
  topic: section
creator: Igor Bdikin
creator: Paula Marques
creator: Duncan Paul Fagg
creator: Gil Gonçalves
rights: Copyright (c) 2022 Nanomaterials Science & Engineering
date: 2022-12-11
publication date: 2022-12-11
starting page: 1
ending page: 39
doi: 10.34624/nmse.v4i1.30951

YAG:Ag nanophosphors – synthesis and characterization
type: item
description: Yttrium Aluminium Garnet (Y3Al5O12)-YAG and Ag of four different mol% in YAG (0.5, 1.0, 1.5 and 2.0 mol % of Ag) – YAG:Ag were synthesized by Pechini method. The synthesized pure YAG was white in colour but the incorporation of Ag in the YAG matrix forms colour centre and turns to pink. The intensity of pink Ag doped YAG is increasing with the increase in mol% of Ag. In the present work the synthesis and the preliminary characteristics about the structure, morphology, elemental composition and optical properties were studied using XRD, FTIR, SEM – EDAX, UV-Vis and PL spectroscopy. The sharp peak in the XRD reveals the good crystalline nature of the samples. The bending and stretching vibrations of the oxygen groups associated with YAG was observed in FTIR spectra. Tube like morphology was noticed in the SEM and increase in crystallite size is also perceived in YAG:Ag. The elemental mapping by EDAX confirmed the purity of synthesised samples. UV spectra shows the absorption peaks due to Ag incorporated in the YAG matrix. The PL spectra reveals the blue and green light emitting properties of the synthesized YAG nanophosphors.
subject: Articles
  topic: section
subject: Yttrium Aluminium Garnet
  topic: keywords
subject: nanophosphors
  topic: keywords
subject: phosphors
  topic: keywords
subject: luminescence
  topic: keywords
subject: YAG
  topic: keywords
creator: S. Shanmuga Sundari
creator: S. Karthika
creator: A. Durairajan
creator: M.P.F. Graça
creator: M. A. Valente
rights: Copyright (c) 2021 Nanomaterials Science & Engineering
date: 2021-12-19
publication date: 2021-12-19
starting page: 35
ending page: 42
doi: 10.34624/nmse.v3i2.25956

Antimony-lead melts for high temperature electrochemical applications
type: item
description: The electrochemical behaviour of antimony-lead melt on saturation with oxygen was studied to assess further prospects of such melts as anode materials for high-temperature fuel cells. A perovskite ceramic was used as a robust current collector material. The related mechanisms of alloying and phase segregation were revealed at different melt oxidation levels using combined impedance spectroscopy and thermodynamic analysis.
subject: Articles
  topic: section
subject: Fuel cells
  topic: keywords
subject: Alloy melts
  topic: keywords
subject: Polarization resistance
  topic: keywords
subject: High-temperature electrochemistry
  topic: keywords
creator: S. M. Mikhalev
creator: Paulo S.B. Julião
creator: F. J.A. Loureiro
creator: A. L. Shaula
creator: D. P. Fagg
rights: Copyright (c) 2021 Nanomaterials Science & Engineering
date: 2021-12-19
publication date: 2021-12-19
starting page: 43
ending page: 46
doi: 10.34624/nmse.v3i2.25983

Magnetic Field, Heat Transfer and Rheological Analysis of a Magnetorheometer using Finite Element Method
type: item
description: Magnetorheological (MR) fluids show changes in apparent viscosity under an applied magnetic field. As a result, dramatic and reversible changes in rheological properties occurred, which permits many electromechanical devices to have potential utility in the aerospace, automobile, medical, and another field. Therefore, there is a need to investigate the rheological properties and heat developed due to changes in the rheological properties of MR fluids under the uniform magnetic field. This work presents the numerical simulation of magnetostatic, laminar fluid flow, and thermal field distribution of a plate-plate magnetorheometer using the finite element method. We analyzed the magnetic field distribution and magnitude of the magnetic field along the radius of the plates. We obtained a better uniform magnetic field along the radius of the plate with enhanced the magnitude of the magnetic field at a particular applied current compared to the other existing design of the rheometer. The maximum magnetic flux density at 4A of coil current is 1.3T. Laminar flow simulation gives the shear stress at the applied magnetic field as a function of the shear rate. We obtained the maximum velocity of the magnetic particles at the outer radius between plates. The heat generated due to the electromagnetic coil and slippage heating between the plates (i.e., MR region) is 302.5K and 308.5K at 3A current after 40 minutes of working time of magnetorheometer. The maximum temperature generated due to the combined effect of the electromagnetic coil and slippage is about 318K after 40 minutes of working time of magnetorheometer, much below the operating temperature of MR fluids. Here we enhanced the magnetic field density profile and magnitude of magnetic flux density along the working radius of the plate and minimized the effects of resistive coil heating in the MR fluid region by the coil and location design.
subject: Articles
  topic: section
subject: Apparent viscosity
  topic: keywords
subject: magnetic-field
  topic: keywords
subject: magnetorheometer
  topic: keywords
subject: temperature
  topic: keywords
subject: shear stress
  topic: keywords
creator: Chandra Shekhar Maurya
creator: Chiranjit Sarkar
rights: Copyright (c) 2021 Nanomaterials Science & Engineering
date: 2021-12-19
publication date: 2021-12-19
starting page: 47
ending page: 53
doi: 10.34624/nmse.v3i2.26269

Nanomaterials Science & Engineering, Volume 3, Number 2, December 2021
type: item
subject: Full Text
  topic: section
creator: Igor Bdikin
creator: Paula Marques
creator: Duncan Paul Fagg
rights: Copyright (c) 2021 Nanomaterials Science & Engineering
date: 2021-12-23
publication date: 2021-12-23
starting page: 33
ending page: 55
doi: 10.34624/nmse.v3i2.27223

Polarization switching in PVDF ferroelectric polymer composites containing graphene layers: molecular dynamic simulations
type: item
description: In this work molecular modeling and quantum molecular dynamic (MD) calculations studies composite nanostructure containing ferroelectric polymer PVDF and graphene layers were carried out using HyperChem software and PM3 semi-empirical method. It is shown that the inclusion (addition) of graphene layers to the ferroelectric PVDF polymer increases the coercive field of the composite structure and decreases the polarization switching times of this composite heterostructure. The data obtained predict possible new compositions of such nano and heterostructures with altered or adjustable times of polarization switching and coercive fields, which can be promising for applications.
subject: Articles
  topic: section
subject: ferroelectric polymers
  topic: keywords
subject: graphene
  topic: keywords
subject: switching time
  topic: keywords
subject: coercive filed
  topic: keywords
subject: hysteresis
  topic: keywords
subject: composite
  topic: keywords
creator: Vladimir Bystrov
creator: Ekaterina Paramonova
creator: Anna Bystrova
creator: Hong Shen
creator: Xiangjian Meng
rights: Copyright (c) 2021 Nanomaterials Science & Engineering
date: 2021-03-07
publication date: 2021-03-07
starting page: 5
ending page: 13
doi: 10.34624/nmse.v3i1.23923

Method for determining the chirality sign of peptide nanotubes using the dipole moments vectors calculations
type: item
description: In this work the method for calculating the index and sign of chirality using the values of the dipole moments of each individual dipeptides forming a helix structure of a peptide nanotube is proposed. Calculations of the individual dipeptide dipole moments using semi-empirical quantum method PM3 and force field method Amber are preformed in the frame of HyperChem software package. Results obtained for diphenylalnine (FF) peptide nanotube (PNT) with two different initial chirality L-FF and D-FF shows correct results of the chirality changes on D and L for helical PNT, corresponding to the law of the change in the sign of chirality, when the hierarchical structure of the molecular system becomes more complex. The results obtained give us a new opportunity to see the physical basis for the formation of the type and sign of chirality and open up new possibilities for a quantitative study of this phenomenon. This approach can be applied to other similar structures and peptide nanotubes based on other amino acids and dipeptides.
subject: Articles
  topic: section
subject: proteins, amino acids, dipeptides, peptide nanotubes, helices, dipole moment
  topic: keywords
creator: Vladimir Bystrov
creator: Alla Sidorova
creator: Aleksei Lutsenko
creator: Denis Shpigun
creator: Vsevolod Tverdislov
creator: Pavel Zelenovskiy
creator: Svitlana Kopyl
creator: Andrei Kholkin
rights: Copyright (c) 2021 Nanomaterials Science & Engineering
date: 2021-03-17
publication date: 2021-03-17
starting page: 14
ending page: 21
doi: 10.34624/nmse.v3i1.23956

Facile Hydrothermal Synthesis of CoFe2O4/Co3O4 Nanostructures for Efficient Oxygen Evolution Reaction
type: item
description: Co/Fe-based spinel oxide materials play an important role in the development of non-precious-metal-based electrocatalysts toward water splitting. Herein, we have synthesized the CoFe2O4/Co3O4 nanostructures via facile hydrothermal method. CoFe2O4/Co3O4 nanostructures exhibited a low overpotential of 311 mV @10 mA/cm2, a small Tafel slope of 87 mV/dec, as well as remarkable long-term stability towards OER. The performance of CoFe2O4/Co3O4 nanostructures is considerably higher than that of bare CoFe2O4 and Co3O4 materials. The outstanding performance is mainly attributed to the synergistic effect and increased active sites for OER reactions. This study can pave a pathway for engineering non-noble metal-based efficient, cost-effective, and durable electrocatalysts for OER.
subject: Articles
  topic: section
subject: Oxygen Evolution Reaction
  topic: keywords
subject: CoFe2O4/Co3O4 Nanostructures
  topic: keywords
subject: Hydrothermal Synthesis
  topic: keywords
subject: Overpotential
  topic: keywords
creator: Manoj Kumar Singh
creator: Pratik V. Shinde
creator: Rutuparna Samal
creator: Chandra Sekhar Rout
rights: Copyright (c) 2021 Nanomaterials Science & Engineering
date: 2021-03-25
publication date: 2021-03-25
starting page: 22
ending page: 30
doi: 10.34624/nmse.v3i1.24058

Nanomaterials Science & Engineering, Volume 3, Number 1, March 2021
type: item
subject: Full Text
  topic: section
creator: Igor Bdikin
creator: Paula Marques
creator: Duncan Paul Fagg
rights: Copyright (c) 2021 Nanomaterials Science & Engineering
date: 2021-03-27
publication date: 2021-03-27
starting page: 1
ending page: 32
doi: 10.34624/nmse.v3i1.24166

Photocatalytic degradation of organic pollutant using TiO2/rGO nanocomposites under simulated sunlight
type: item
description: Here, we present the development and performance of a nanocomposite photocatalyst based on titanium dioxide (TiO2) and reduced graphene oxide (rGO). The material was prepared using a direct sol-gel method, followed by hydrothermal treatment. Different experimental conditions, such as time and temperature during the synthesis, were investigated with the aim to optimize photocatalytic degradation. The influence of the preparation conditions on the physicochemical properties of the synthesized powders was established by different characterization methods such as Scanning Electron Microscopy (SEM), and Raman spectroscopy. The effectiveness of the synthesized photocatalysts was examined through the photodegradation of caffeine under simulated sunlight irradiation. The influence of synthesized parameters on the TiO2/rGO performance for the photodegradation of pharmaceutical caffeine was monitored by UV-Vis spectroscopy. The obtained results show that the photocatalytic properties of the prepared TiO2/rGO composites depend on different experimental parameters of their synthesis procedure, such as time and temperature. The TiO2/rGO_6/400 composite presents a very efficient photo-degradation of caffeine by simulated sunlight irradiation, resulting in an efficiency of 95% within 90 minutes.
subject: Articles
  topic: section
subject: graphene oxide
  topic: keywords
subject: photocatalysis
  topic: keywords
subject: reduced graphene oxide
  topic: keywords
subject: TiO2/rGO composites
  topic: keywords
subject: visible irradiation
  topic: keywords
creator: Martina Kocijan
creator: Lidija Curkovic
creator: Tina Radosevic
creator: Matejka Podlogar
rights: Copyright (c) 2020 Nanomaterials Science & Engineering
date: 2020-12-11
publication date: 2020-12-11
starting page: 162
ending page: 169
doi: 10.34624/nmse.v2i4.21063

Modeling of the 2D-materials hybrid nanostructures based on ferroelectric polymer PVDF/P(VDF-TrFE) and MoS2 Dichalcogenide
type: item
description: Transition metal dichalcogenide MoS2 monolayers is very promising for many applications, especially in the fields of optics as emitters and detectors, in electronics as transistors. It is first of all due that they have a direct band gap Eg, which is dependent on external applied electric fields. To create such an electric field, it is proposed to use the field induced polarization of ferroelectric polymers such as PVDF and P(VDF-TrFE). These polymers in the ferroelectric phase are capable to create significant polarization in very thin layers, about 5 Å. By combining such ferroelectric layers and MoS2 layers, hybrid nanostructures can be created, that are convenient for design of new photodetectors with controlled properties. The prominent properties of this hybrid structure arise and benefit namely from the ferroelectric-polarization-induced ultra-high electric field of the PVDF or P(VDF-TrFE), that impact on MoS2 layers and control the band gap Eg. In this work, we simulate such a hybrid structure based on PVDF and MoS2 layers and study their features and properties. For calculating MoS2, the methods of density functional theory (DFT) are used, implemented in the VASP program. Semi-empirical methods based on the HyperChem software package are used to model and study both individual layers of the hybrid structure and the features of their joint interaction. The results obtained convincingly show a strong influence on the width of the MoS2 bandgap Eg from the side of the PVDF layers, creating polarization P and an electric field E, which affects MoS2 layers. In addition, the dependence of the band gap Eg under the action of electric field E from the distance between the layers PVDF and MoS2 has been established.
subject: Articles
  topic: section
subject: dichalcogenide, MoS2, polymer ferroelectrics, heterostructure, ferroelectricity
  topic: keywords
creator: V. S. Bystrov
creator: E. V. Paramonova
creator: A. V. Sapronova
creator: Hong Shen
creator: Xiangjian Meng
creator: Jianlu Wang
creator: L. A. Avakyan
rights: Copyright (c) 2020 Nanomaterials Science & Engineering
date: 2020-12-11
publication date: 2020-12-11
starting page: 183
ending page: 197
doi: 10.34624/nmse.v2i4.22873

Improved performance of Silicon solar cells by ZnMgO front laye
type: item
description: Silicon solar cells play a dominant role in the photovoltaic market. However, their manufacturing process is quite expensive and involves complex processes. Therefore, new materials are intensively explored for the aim of potentially higher efficiency and lower cost solar cells. ZnMgO alloy is a very promising transparent conductive oxide layer and which acts as front layer as well as an anti-reflective coating in silicon solar cells reducing costs and complexity of process. Numerical simulation using the SCAPS-1D software enables to find the optimized parameters of p-Si/ZnMgO hetero-junction in comparison with the structure comprising ZnO front layer. Even with the effect of stress caused by the high lattice mismatch at the ZnMgO/Si interface, our calculations show a conversion efficiency of 16.57%.The introduction of a thin layer of hydrogenated amorphous silicon improves the cell output performance to 17.14%.
subject: Articles
  topic: section
subject: 1D-SCAPS software
  topic: keywords
subject: passivation layer
  topic: keywords
subject: Silicon solar cells
  topic: keywords
subject: ZnMgO alloy
  topic: keywords
creator: Amel Bahfir
creator: Messaoud Boumaour
creator: Zoubir Chaieb
creator: Hadjira Labeche
rights: Copyright (c) 2020 Nanomaterials Science & Engineering
date: 2020-12-10
publication date: 2020-12-10
starting page: 148
ending page: 153
doi: 10.34624/nmse.v2i4.19557

Hybrid microwave sintering of alumina ceramics which contain waste alumina
type: item
description: The use of microwave energy to sinter ceramic materials offers benefits compared to conventional sintering methods. Some of benefits regarding to less time consumption, achieving high heating rates, and saving energy. The hybrid microwave sintering because of its advantageous is a method of wide interest for improving the microstructure of sintered materials. In this study, the goal was to investigate the influence of the hybrid microwave sintering because on the properties of alumina ceramics, which contain a considerable amount of waste alumina powder. The study was limited to hybrid microwave sintering of alumina green bodies in which the grain growth and densification were characterized. The waste alumina powder, which is generated during machining of alumina green compacts and high-purity (99.9 %) alumina powder, were used as starting materials. The Alumina green bodies were obtained by the slip casting process. The dried green samples were then sintered by using a hybrid microwave furnace. The used hybrid microwave sintering atmospheric furnace consists of a 2.45 GHz microwave generator with a continuously adjustable power output from 0 to 3 kW and external heating elements. The sintered samples with addition of waste alumina powder were exhibited higher density values, slightly larger grain size, and linear shrinkage in comparison with the samples made of pure alumina powder. The observed microstructure for both samples was uniform with the average grain sizes smaller than 2 microns as a consequence of a hybrid microwave sintering.
subject: Articles
  topic: section
subject: hybrid microwave sintering
  topic: keywords
subject: waste alumina powder
  topic: keywords
subject: recycling
  topic: keywords
subject: morphology
  topic: keywords
creator: Milan Vuksic
creator: Mihaela Ljubek
creator: Irena Zmak
creator: Lidija Curkovic
rights: Copyright (c) 2020 Nanomaterials Science & Engineering
date: 2020-12-11
publication date: 2020-12-11
starting page: 154
ending page: 161
doi: 10.34624/nmse.v2i4.21069

Crystal structure and magnetic properties of Bi1-xSmxFeO3 ceramics across the phase boundary: effect of high pressure
type: item
description: The solid solutions Bi1-xSmxFeO3 with chemical composition across the morphotropic phase boundary region specific for rhombohedral - orthorhombic structural transition were investigated by X-ray diffraction, electron microscopy and magnetometry. Structural measurements showed a concentration driven transition from the single phase rhombohedral structure to the single phase nonpolar orthorhombic structure through the formation of antipolar orthorhombic phase which coexists with the rhombohedral phase in the compounds with x < 0.15 followed by a coexistence with nonpolar orthorhombic phase in the compounds with x <= 0.18. Application external pressure provides a stabilization of the orthorhombic phase, viz. the polar rhombohedral phase diminishes and transforms to the anti-polar orthorhombic phase, while the anti-polar orthorhombic phase transforms to the non-polar orthorhombic phase. Magnetic properties of the compounds subjected to external pressure demonstrate an increase in the magnetization of the compounds having dominant rhombohedral phase, wherein coercivity significantly increases, while the spontaneous magnetization remains nearly constant.
subject: Articles
  topic: section
creator: S. Latushka
creator: D. V. Zhaludkevich
creator: A. L. Zhaludkevich
creator: A. Pakalniskis
creator: A. N. Chobot
creator: M. V. Silibin
creator: G. M. Chobot
creator: T. V. Latushka
creator: R. Skaudzius
creator: A. Kareiva
creator: D. V. Karpinsky
rights: Copyright (c) 2020 Nanomaterials Science & Engineering
date: 2020-12-11
publication date: 2020-12-11
starting page: 170
ending page: 174
doi: 10.34624/nmse.v2i4.22603

Carbon fibber reinforced polymer use in space launch vehicle propellant tanks - concept and finite element method study
type: item
description: Weight reduction is a never-ending goal in aerospace engineering, especially for a space launch vehicle (SLV), were every gram of mass has a penalty in the vehicle's performance. Since propellant tanks generally weigh more than half of the dry mass of a SLV, it is particularly advantageous to implement composite materials in their construction. Yet, difficulties with oxygen compatibility, permeability and manufacturing maturity dictate that aluminium alloys with high lithium content are still the state of the art in this field. Recent developments in the aerospace composites industry are starting to change this perception, especially regarding Carbon Fibber Reinforced Polymer (CFRP) application. Hence this study, which aims to propose an integral CFRP propellant tank concept and determine mass savings by comparing it to a metallic baseline, through finite element method (FEM) analysis with simulated flight loads. Tank dimensions, geometry and loads were chosen for micro-satellite SLV application. Also, Altair's Optistruct solver was used for FEM calculations, with Altair's HyperWorks for pre and post-processing. A mass reduction of close to 35% has been obtained with comparison to the metallic baseline design for the same boundary conditions. Therefore, a sound and competitive design for a micro-satellite SLV propellant tank has been successfully achieved.
subject: Articles
  topic: section
subject: CFRP
  topic: keywords
subject: Propellant Tank
  topic: keywords
subject: Space Launch Vehicle
  topic: keywords
subject: FEM
  topic: keywords
creator: Miguel Fernandes
creator: Francisco Brojo
rights: Copyright (c) 2020 Nanomaterials Science & Engineering
date: 2020-12-11
publication date: 2020-12-11
starting page: 175
ending page: 182
doi: 10.34624/nmse.v2i4.21072