Pub Date : 2019-09-01DOI: 10.1142/s2251237319500084
B. Benrabah, Hadj Benhebal, Abdelmalek Kharroubi, M. Touati
This work shows an investigation of tin-doped Mn2O3 thin layers synthesized via sol–gel process and deposited on glass substrates using dip-coating technique. The Sn concentration was changed from 0% to 9%. The obtained samples were characterized by X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR), Ultraviolet–Visible spectroscopy (UV–Vis) and impedance spectroscopy (IS). XRD showed that Mn2O3 was crystallized in the cubic form with directionally preferential orientation structure (222). The formation of Mn2O3 was also confirmed by FTIR spectroscopy. The optical transmittance of the samples is greater than 70% and increases following doping, while the band gap energy decreases with an increase in Sn doping concentration. Complex IS indicates that the resulting circuit is a parallel RpCp where Cp is the capacitance of the layer and Rp its resistance.
{"title":"Sol–Gel Preparation and Characterization of Tin-Doped Dimanganese Trioxide Thin Films","authors":"B. Benrabah, Hadj Benhebal, Abdelmalek Kharroubi, M. Touati","doi":"10.1142/s2251237319500084","DOIUrl":"https://doi.org/10.1142/s2251237319500084","url":null,"abstract":"This work shows an investigation of tin-doped Mn2O3 thin layers synthesized via sol–gel process and deposited on glass substrates using dip-coating technique. The Sn concentration was changed from 0% to 9%. The obtained samples were characterized by X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR), Ultraviolet–Visible spectroscopy (UV–Vis) and impedance spectroscopy (IS). XRD showed that Mn2O3 was crystallized in the cubic form with directionally preferential orientation structure (222). The formation of Mn2O3 was also confirmed by FTIR spectroscopy. The optical transmittance of the samples is greater than 70% and increases following doping, while the band gap energy decreases with an increase in Sn doping concentration. Complex IS indicates that the resulting circuit is a parallel RpCp where Cp is the capacitance of the layer and Rp its resistance.","PeriodicalId":16406,"journal":{"name":"Journal of Molecular and Engineering Materials","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/s2251237319500084","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47943499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-09-01DOI: 10.1142/s2251237319500072
Sudip Banerjee, S. Poria, G. Sutradhar, P. Sahoo
This work examines the effects of WC nanoparticles on nanohardness, elastic modulus and scratch-induced wear behavior of Mg-based metal matrix nanocomposites. Ultrasonic vibrator-equipped stir casting furnace is used to fabricate Mg–WC nanocomposites. Scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDAX) and X-ray diffraction (XRD) are employed to conduct the characterizations of base alloy and Mg–WC nanocomposites. Vickers microhardness tester is used to obtain the microhardness values of the fabricated materials. Nanoindentation tests are performed to find the effect of wt.% of WC on the mechanical properties, i.e., nanohardness and elastic modulus. Nanohardness and elastic modulus present nearly 122% and 169.37% increments, respectively, compared to the base alloy when only 2[Formula: see text]wt.% of WC is present as reinforcement. Scratch tests are performed to find the effects of wt.% of WC and applied load on the scratch-induced wear and coefficient of friction (CoF) of the base alloy and Mg–WC nanocomposites. Wear volume also decreases continuously with increase in the weight percentage of WC in magnesium alloy. The COFs of nanocomposites are almost constant but they are inclined to increase with the increase in wt.% of WC. Finally, SEM micrographs of scratch grooves are analyzed to find the wear mechanisms. Abrasive wear mechanism is found to be the dominant one regarding the scratch of Mg–WC nanocomposites.
{"title":"Nanoindentation and Scratch Resistance Characteristics of AZ31–WC Nanocomposites","authors":"Sudip Banerjee, S. Poria, G. Sutradhar, P. Sahoo","doi":"10.1142/s2251237319500072","DOIUrl":"https://doi.org/10.1142/s2251237319500072","url":null,"abstract":"This work examines the effects of WC nanoparticles on nanohardness, elastic modulus and scratch-induced wear behavior of Mg-based metal matrix nanocomposites. Ultrasonic vibrator-equipped stir casting furnace is used to fabricate Mg–WC nanocomposites. Scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDAX) and X-ray diffraction (XRD) are employed to conduct the characterizations of base alloy and Mg–WC nanocomposites. Vickers microhardness tester is used to obtain the microhardness values of the fabricated materials. Nanoindentation tests are performed to find the effect of wt.% of WC on the mechanical properties, i.e., nanohardness and elastic modulus. Nanohardness and elastic modulus present nearly 122% and 169.37% increments, respectively, compared to the base alloy when only 2[Formula: see text]wt.% of WC is present as reinforcement. Scratch tests are performed to find the effects of wt.% of WC and applied load on the scratch-induced wear and coefficient of friction (CoF) of the base alloy and Mg–WC nanocomposites. Wear volume also decreases continuously with increase in the weight percentage of WC in magnesium alloy. The COFs of nanocomposites are almost constant but they are inclined to increase with the increase in wt.% of WC. Finally, SEM micrographs of scratch grooves are analyzed to find the wear mechanisms. Abrasive wear mechanism is found to be the dominant one regarding the scratch of Mg–WC nanocomposites.","PeriodicalId":16406,"journal":{"name":"Journal of Molecular and Engineering Materials","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/s2251237319500072","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49030010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-01DOI: 10.1142/S2251237318500053
R. Lianngenga, J. Lalvohbika, Lalawmpuia
The problem of incident plane waves at the interface of micropolar thermoelastic half-space with voids and micropolar elastic half-space with voids has been attempted. The amplitude and energy ratios of various reflected and refracted waves for the incident [Formula: see text]- and [Formula: see text]-waves are obtained with the help of appropriate boundary conditions at the interface. The effect of linear thermal expansion and microinertia on the amplitude and energy ratios due to the incident [Formula: see text]- and [Formula: see text]-waves are discussed. Numerically and analytically, these amplitude and energy ratios are computed to show the effect of linear thermal expansion and microinertia. It is observed that the effect of linear thermal expansion is less for incident [Formula: see text]-wave and the effect of microinertia is less for incident [Formula: see text]-wave.
{"title":"Refraction of P- and S-Wave at the Interface of Micropolar Elasticity and Thermoelasticity with Voids","authors":"R. Lianngenga, J. Lalvohbika, Lalawmpuia","doi":"10.1142/S2251237318500053","DOIUrl":"https://doi.org/10.1142/S2251237318500053","url":null,"abstract":"The problem of incident plane waves at the interface of micropolar thermoelastic half-space with voids and micropolar elastic half-space with voids has been attempted. The amplitude and energy ratios of various reflected and refracted waves for the incident [Formula: see text]- and [Formula: see text]-waves are obtained with the help of appropriate boundary conditions at the interface. The effect of linear thermal expansion and microinertia on the amplitude and energy ratios due to the incident [Formula: see text]- and [Formula: see text]-waves are discussed. Numerically and analytically, these amplitude and energy ratios are computed to show the effect of linear thermal expansion and microinertia. It is observed that the effect of linear thermal expansion is less for incident [Formula: see text]-wave and the effect of microinertia is less for incident [Formula: see text]-wave.","PeriodicalId":16406,"journal":{"name":"Journal of Molecular and Engineering Materials","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S2251237318500053","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41869710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-01DOI: 10.1142/S2251237318500065
A. Zenkour
The thermoelastic problem of clamped axisymmetric infinite hollow cylinders under thermal shock with variable thermal conductivity is presented. The outer surface of infinite hollow cylinder is considered to be thermally insulated while inner surface is subjected to an initial heating source. In addition, the cylinder is considered to be clamped at its inner and outer radii. Generalized thermoelasticity theories are used to deal with the field quantities. All generalized thermoelasticity theories such as Green and Lindsay, Lord and Shulman, and coupled thermoelasticity (CTE) are considered as special cases of the present theory. Effects of variable thermal conductivity and time parameters on radial displacement, temperature, and stresses of the hollow cylinders are investigated.
{"title":"Generalized Thermoelasticity Theories for Axisymmetric Hollow Cylinders Under Thermal Shock with Variable Thermal Conductivity","authors":"A. Zenkour","doi":"10.1142/S2251237318500065","DOIUrl":"https://doi.org/10.1142/S2251237318500065","url":null,"abstract":"The thermoelastic problem of clamped axisymmetric infinite hollow cylinders under thermal shock with variable thermal conductivity is presented. The outer surface of infinite hollow cylinder is considered to be thermally insulated while inner surface is subjected to an initial heating source. In addition, the cylinder is considered to be clamped at its inner and outer radii. Generalized thermoelasticity theories are used to deal with the field quantities. All generalized thermoelasticity theories such as Green and Lindsay, Lord and Shulman, and coupled thermoelasticity (CTE) are considered as special cases of the present theory. Effects of variable thermal conductivity and time parameters on radial displacement, temperature, and stresses of the hollow cylinders are investigated.","PeriodicalId":16406,"journal":{"name":"Journal of Molecular and Engineering Materials","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S2251237318500065","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43968572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-09-01DOI: 10.1142/S2251237318500077
Cesar A. Manrique-Bastidas, P. Sundaram, P. Resto, N. Mina-Camilde, S. Hernández‐Rivera
Raman scattering (RS) was used as a powerful, efficient, and sensitive technique for studying intermolecular interactions between an organic ligand adsorbate and a metallic substrate. Functionalization of titanium (TiO2[Formula: see text]Ti) surfaces was performed using lysine (Lys) as adsorbate and later developing a hydroxyapatite (HA) layer onto this functionalized surface. The functionalization process was performed at different pH values of the interacting chemical species. Chemisorption onto the TiO2Ti substrates through the Lys carboxylic group was demonstrated spectroscopically. Analysis of vibrational spectra showed that the CH side chain of Lys was relatively distant from the (TiO2[Formula: see text]Ti) surface, preventing direct contact with the surface. Additionally, the signals corresponding to the unbound [Formula: see text]-NH2 group indicate that it is available for additional complexation. In vitro bioactivity of the Lys–TiO2[Formula: see text]Ti surface was achieved by developing an HA layer onto already functionalized TiO2[Formula: see text]Ti surfaces at various pH values. Spectroscopic data using the spectral markers of HA and Lys provided a decisive role in establishing the necessary baseline data for evidencing the intermolecular bonding. The functionalized TiO2[Formula: see text]Ti surface reactivity is linked to the specific intermolecular interactions of –COO− (pH 7.0) with Ca[Formula: see text] ions, as well as the –COOH (pH 2.0 and 12.0) groups of Lys, with the –OH groups of PO[Formula: see text] belonging to HA.
{"title":"Functionalization of Titanium Surfaces with Lysine: A Micro Raman Study of the Intermolecular Interactions of Lysine-TiO2","authors":"Cesar A. Manrique-Bastidas, P. Sundaram, P. Resto, N. Mina-Camilde, S. Hernández‐Rivera","doi":"10.1142/S2251237318500077","DOIUrl":"https://doi.org/10.1142/S2251237318500077","url":null,"abstract":"Raman scattering (RS) was used as a powerful, efficient, and sensitive technique for studying intermolecular interactions between an organic ligand adsorbate and a metallic substrate. Functionalization of titanium (TiO2[Formula: see text]Ti) surfaces was performed using lysine (Lys) as adsorbate and later developing a hydroxyapatite (HA) layer onto this functionalized surface. The functionalization process was performed at different pH values of the interacting chemical species. Chemisorption onto the TiO2Ti substrates through the Lys carboxylic group was demonstrated spectroscopically. Analysis of vibrational spectra showed that the CH side chain of Lys was relatively distant from the (TiO2[Formula: see text]Ti) surface, preventing direct contact with the surface. Additionally, the signals corresponding to the unbound [Formula: see text]-NH2 group indicate that it is available for additional complexation. In vitro bioactivity of the Lys–TiO2[Formula: see text]Ti surface was achieved by developing an HA layer onto already functionalized TiO2[Formula: see text]Ti surfaces at various pH values. Spectroscopic data using the spectral markers of HA and Lys provided a decisive role in establishing the necessary baseline data for evidencing the intermolecular bonding. The functionalized TiO2[Formula: see text]Ti surface reactivity is linked to the specific intermolecular interactions of –COO− (pH 7.0) with Ca[Formula: see text] ions, as well as the –COOH (pH 2.0 and 12.0) groups of Lys, with the –OH groups of PO[Formula: see text] belonging to HA.","PeriodicalId":16406,"journal":{"name":"Journal of Molecular and Engineering Materials","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S2251237318500077","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47389981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-03-01DOI: 10.1142/S2251237318500028
B. M. Al-Shabander, A. A. Mohammed, A. Khalil
In this study, coal ash/recycled plastic composite material was fabricated with post-consumer high-density polyethylene (HDPE) and coal ash particles. The main idea of using coal ash, since it is a...
{"title":"Mechanical Properties and Thermal Conductivity of Coal Ash-Recycled High-Density Polyethylene Composite","authors":"B. M. Al-Shabander, A. A. Mohammed, A. Khalil","doi":"10.1142/S2251237318500028","DOIUrl":"https://doi.org/10.1142/S2251237318500028","url":null,"abstract":"In this study, coal ash/recycled plastic composite material was fabricated with post-consumer high-density polyethylene (HDPE) and coal ash particles. The main idea of using coal ash, since it is a...","PeriodicalId":16406,"journal":{"name":"Journal of Molecular and Engineering Materials","volume":"06 1","pages":"1850002"},"PeriodicalIF":1.5,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S2251237318500028","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46829824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-03-01DOI: 10.1142/S2251237318500016
Abdelmalek Kharoubi, A. Bouaza, B. Benrabah, A. Ammari, Hadj Benhebal, B. Khiali, Cherifa Dalache
Undoped and Mn-doped TiO2 thin films have been prepared by sol–gel dip-coating technique on glass and silicon substrates. X-ray diffraction studies showed that both TiO2 and Mn-doped TiO2 thin film...
{"title":"Sol–Gel Dip Coating Method Synthesis of Mn-Doped Titanium Dioxide Thin Films","authors":"Abdelmalek Kharoubi, A. Bouaza, B. Benrabah, A. Ammari, Hadj Benhebal, B. Khiali, Cherifa Dalache","doi":"10.1142/S2251237318500016","DOIUrl":"https://doi.org/10.1142/S2251237318500016","url":null,"abstract":"Undoped and Mn-doped TiO2 thin films have been prepared by sol–gel dip-coating technique on glass and silicon substrates. X-ray diffraction studies showed that both TiO2 and Mn-doped TiO2 thin film...","PeriodicalId":16406,"journal":{"name":"Journal of Molecular and Engineering Materials","volume":"06 1","pages":"1850001"},"PeriodicalIF":1.5,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S2251237318500016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44487238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-03-01DOI: 10.1142/S2251237318500041
N. Raghavendra
The corrosion inhibition of carbon steel (CS) in 3 M HCl was thoroughly investigated in the presence and absence of areca plant extracts as a green corrosion inhibitor. The effect of solution tempe...
碳钢（CS）在3 M HCl在槟榔植物提取物作为绿色缓蚀剂存在和不存在的情况下进行了彻底的研究。溶液温度的影响。。。
{"title":"Areca Plant Extracts as a Green Corrosion Inhibitor of Carbon Steel Metal in 3 M Hydrochloric Acid: Gasometric, Colorimetry and Atomic Absorption Spectroscopy Views","authors":"N. Raghavendra","doi":"10.1142/S2251237318500041","DOIUrl":"https://doi.org/10.1142/S2251237318500041","url":null,"abstract":"The corrosion inhibition of carbon steel (CS) in 3 M HCl was thoroughly investigated in the presence and absence of areca plant extracts as a green corrosion inhibitor. The effect of solution tempe...","PeriodicalId":16406,"journal":{"name":"Journal of Molecular and Engineering Materials","volume":"06 1","pages":"1850004"},"PeriodicalIF":1.5,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S2251237318500041","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46685804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-03-01DOI: 10.1142/S225123731850003X
S. Sarkar, R. Baranwal, Shubhankar Banerjee, Aditya Prakash, Rupam Mandal, G. Majumdar
The present work deals with the synthesis of chemically deposited nickel–phosphorous (Ni–P) coating on copper substrate. The process parameters are optimized for maximum hardness based on L27 Taguc...
本文研究了在铜基体上化学沉积镍磷（Ni–P）涂层的合成。基于L27 Taguc。。。
{"title":"Parametric Optimization of Process Parameters on the Response of Microhardness of Electroless Ni-P Coating","authors":"S. Sarkar, R. Baranwal, Shubhankar Banerjee, Aditya Prakash, Rupam Mandal, G. Majumdar","doi":"10.1142/S225123731850003X","DOIUrl":"https://doi.org/10.1142/S225123731850003X","url":null,"abstract":"The present work deals with the synthesis of chemically deposited nickel–phosphorous (Ni–P) coating on copper substrate. The process parameters are optimized for maximum hardness based on L27 Taguc...","PeriodicalId":16406,"journal":{"name":"Journal of Molecular and Engineering Materials","volume":"06 1","pages":"1850003"},"PeriodicalIF":1.5,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S225123731850003X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46061823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-12-05DOI: 10.1142/S2251237317500083
A. Zenkour, A. Abouelregal
A two-temperature theory of the generalized thermoelasticity is proposed to study the effect of temperature dependence on a semi-infinite medium. The surface of bounding plane of the medium is unde...
为了研究半无限介质中温度依赖性的影响，提出了广义热弹性的双温度理论。介质的边界面表面在…
{"title":"Laser Pulse Heating of a Semi-Infinite Solid Based on a Two-Temperature Theory with Temperature Dependence","authors":"A. Zenkour, A. Abouelregal","doi":"10.1142/S2251237317500083","DOIUrl":"https://doi.org/10.1142/S2251237317500083","url":null,"abstract":"A two-temperature theory of the generalized thermoelasticity is proposed to study the effect of temperature dependence on a semi-infinite medium. The surface of bounding plane of the medium is unde...","PeriodicalId":16406,"journal":{"name":"Journal of Molecular and Engineering Materials","volume":"05 1","pages":"1750008"},"PeriodicalIF":1.5,"publicationDate":"2017-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S2251237317500083","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48814409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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