Papers by esmaeil tohidlou
• To study the effects of adding erbium and graphene (separately and in combination) on the mecha... more • To study the effects of adding erbium and graphene (separately and in combination) on the mechanical properties of Al-7.5Si-0.5Mg alloy. • The addition of erbium and graphene reduced the grain size of alpha-aluminum. • The best tensile and wear properties were obtained for the sample containing 0.2 wt% erbium + 0.4 wt% graphene.
Powder Metallurgy and Metal Ceramics, 2018
In this research, AlSi10Mg composites reinforced with graphene nanoplatelets (GNPs) were fabricat... more In this research, AlSi10Mg composites reinforced with graphene nanoplatelets (GNPs) were fabricated in order to study the effect of GNPs on microstructure and mechanical properties of the AlSi10Mg alloy. The composites were produced by a wet mixing method followed by two-step hot consolidation (hot compaction then hot extrusion) at 673 K (400C). The weight percentages of GNPs were 0.5 and 1 wt.% with respect to the AlSi10Mg alloy. Tensile and Vickers hardness tests at room temperature were performed to evaluate the effect of GNPs on mechanical properties of asfabricated composite. The outcomes show that the high quantity of GNPs (>0.5 wt.%) deteriorates the mechanical properties of AlSi10Mg composite due to the agglomeration of GNPs and, as a consequence, introduction of internal porosity in the composite. However, it is found that relatively low fraction of GNPs can uniformly be dispersed in the Al alloy matrix through the wet mixing method. The hardness and tensile results demonstrated that the mechanical properties improve slightly through the addition of 0.5 wt.% of GNPs, while 1.0 wt.% GNPs addition did not lead to improved performance owing to overwhelming effects of porosity.
Journal of Applied Polymer Science
The Journal of The Textile Institute, 2021
Abstract The objective of this work was to enhance the mechanical properties of E-glass chopped s... more Abstract The objective of this work was to enhance the mechanical properties of E-glass chopped strand mat (CSM)/epoxy composite via the incorporation of CaCO3 nanoparticles in the matrix. 3-aminopropyltrimethoxysilane as an organosilane compound was utilized to functionalize the surface of CaCO3 nanoparticles. The multiscale composites containing functionalized-CaCO3 (f-CaCO3) with various weight fractions (0.5, 1, 3, and 5 wt.%) were prepared to explore the effects of f-CaCO3 on the flexural and wear properties. The results of the three-point bending test demonstrated that 1 wt.% f-CaCO3 addition led to a maximum enhancement of 44% in the flexural strength of the CSM/epoxy composite. In addition, 42% enhancement in flexural modulus was achieved with the addition of 3 wt.% f-CaCO3. The results of the wear tests showed that the f-CaCO3/epoxy matrix could provide enhanced wear resistance and the maximum resistance was obtained via adding 3 wt.% f-CaCO3. Incorporation of 3 wt.% f-CaCO3 resulted in 56% and 43% reductions in wear rate and friction coefficient of the CSM/epoxy composite, respectively. It was also found that the silanization of CaCO3 had a significant effect on flexural and wear properties. Scanning electron microscopy analysis of the fracture and worn surfaces clearly revealed that the nano-CaCO3 addition resulted in improved fiber-matrix interfacial bonding.
Journal of Industrial Textiles, 2022
This study is primarily focused on the fabrication of nanosilica-decorated graphene oxide (SiO2@G... more This study is primarily focused on the fabrication of nanosilica-decorated graphene oxide (SiO2@GNs) and its role in improving the mechanical behavior of Jute fiber/epoxy laminates. To decorate the GNs surfaces with the silica nanoparticles, tetraethyl-orthosilicate (TEOS) was used, and the successful synthesis of the SiO2@GNs nanohybrid was confirmed by X-ray diffraction (XRD), atomic force microscopy (AFM), and energy dispersive X-ray analysis (EDX). Further, the influence of adding 0.1, 0.3, and 0.5 wt.% GNs or SiO2@GNs on the interlaminar shear strength (ILSS) and dry-sliding wear behavior of the jute fiber/epoxy composites were explored. The specimens were fabricated using the hand lay-up route. Resultantly, the 3 wt.% SiO2@GNs/jute fiber/epoxy sample showed the highest ILSS and wear resistance. The addition of 3 wt.% SiO2@GNs improved the ILSS of the jute fiber/epoxy by 62%. Besides, reductions of 50% and 78% in the wear rate and coefficient of friction, respectively, were obt...
یلک د گژاو نا : یاجرد تیزوپماک Al-Mg2Si میبرا راتخاسزیر یراشف ماکحتسا هدیکچ تیوقت تارذ حلاصا هدنن... more یلک د گژاو نا : یاجرد تیزوپماک Al-Mg2Si میبرا راتخاسزیر یراشف ماکحتسا هدیکچ تیوقت تارذ حلاصا هدننک Mg2Si تیزوپماک رد یاجرد یاه Al-Mg2Si نیا یکیناکم صاوخ دوبهب یارب یدیلک لماع ناونع هب تیزوپماک یم رامش هب اه هصخشم رب میبرا ندوزفا رثا ،رضاح قیقحت رد .دور یاجرد تیزوپماک یراشف راتفر و یراتخاسزیر یاه Al-15 wt.% Mg2Si هنومن راتخاسزیر .تسا هتفرگ رارق یسررب دروم پوکسورکیم زا هدافتسا اب اه رون یاه رارق هعلاطم دروم یشبور ینورتکلا و ی ندوزفا اب هک داد ناشن قیقحت نیا جیاتن .تفرگ 0.6 تارذ هزادنا میبرا ینزو دصرد Mg2Si زا هیلوا 14 هب 8.5 و هتفای شهاک رتمورکیم نآ یژولوفروم نینچمه ژولوفروم رییغت ثعاب میبرا ندوزفا .دش لیدبت یهجودنچ تلاح هب یتیردند تلاح زا اه ی Mg2Si زا یکیتکتوی هقرو تلاح بیکرت یرادقم ،دراوم نیا رانک رد .دش زیر یفایلا تلاح هب یا Al3Er لیکشت یکیتکتوی هیحان رد تیزوپماک دامجنا نیح رد یم تیزوپماک یراشف ماکحتسا دوبهب ثعاب میبرا ندوزفا هک داد ناشن راشف نومزآ جیاتن .دش بهب نازیم نیرتشیب هک یروط هب دوش ( دو 32 یواح هنومن اب طابترا رد )دصرد 0.6 دش هدهاشم میبرا دصرد .
یلک د گژاو نا : یفایلا تیزوپماک میسلک تانبرکونان یحطس حالصا هیال نیب یشرب ماکحتسا یا .یشمخ صاوخ ه... more یلک د گژاو نا : یفایلا تیزوپماک میسلک تانبرکونان یحطس حالصا هیال نیب یشرب ماکحتسا یا .یشمخ صاوخ هدیکچ ،رضاح قیقحت رد هیال نیب یشرب ماکحتسا رب نآ یحطس حالصا نینچمه و میسلک تانبرک ینزو دصرد ریثأت یسررب هب وخ و یا یشمخ صا هتخادرپ نبرک فایلا/یسکوپا تیزوپماک یسکادیسیلگ یرت بیکرت زا هدافتسا اب میسلک تانبرک تارذونان حطس ،تسخن ماگ رد .تسا هدش فیط زیلانآ زا هدافتسا اب همادا رد هک دش حالصا نالیس یسکوتم یرت لیپورپ .تفرگ رارق دییأت دروم یحطس حالصا دنور زمرق نودام جنس ( فلتخم ریداقم رد هدش حالصا میسلک تانبرک تارذونان 0.5 ، 1 ، 3 و 5 شور زا هدافتسا اب )هنیمز ینزو دصرد دراو کینوسارتلآ و ندزمه یاه نومزآ جیاتن .دندش تیزوپماک راتخاس ندوزفا هک داد ناشن یکیناکم یاه 3 هب دوبهب ثعاب هدش حالصا میسلک تانبرک تارذونان ینزو دصرد بیترت 25 ، 36 و 27 هیال نیب یشرب ماکحتسا یدصرد اکحتسا ،یا یم یشمخ لودم و یشمخ م هنومن تسکش حطس زیلانآ .دوش دیوم اه لصف ماکحتسا دوبهب هیال نیب یشرب ماکحتسا .دوب تارذونان روضح رد هنیمز و نبرک فایلا کرتشم یشمخ لودم و یشمخ ماکحتسا ،یا نومن اب هسیاقم رد ار یرتالاب ریداقم هدش یحطس حالصا میس...
In the present work, Na+-montmorillonite nanoclay (Na-MMT) was functionalized using 3-aminopropyl... more In the present work, Na+-montmorillonite nanoclay (Na-MMT) was functionalized using 3-aminopropyltrimethoxysilane (3-APTMS) as a coupling agent. The covalent functionalization of MMT was confirmed by Fourier-transform infrared spectroscopy (FT-IR). In the specimen fabrication stage, 5 wt% of pristine MMT or silane-functionalized MMT (f-MMT) were incorporated into an epoxy system and the resultant mixture was applied on an E-glass chopped strand mat (CSM). A significant enhancement in the mechanical behavior (tensile and flexural properties) of CSM/epoxy composite was observed when enhanced with 5 wt% of f-MMT. The addition of 5 wt% of f-MMT enhanced the tensile strength, flexural strength, tensile modulus, and flexural modulus by 18%, 38%, 18%, and 28%, respectively. Compared to the MMT/CSM/epoxy composite, the f-MMT/CSM/epoxy specimen demonstrated 12%, 18%, 11%, and 16% increase, respectively, in the tensile strength, flexural strength, tensile modulus, and flexural modulus. The obs...
Journal of Applied Polymer Science, 2020
Materials Science and Engineering: A, 2018
Comment on "Microstructure and mechanical properties of Al-nano/micro SiC composites produced by ... more Comment on "Microstructure and mechanical properties of Al-nano/micro SiC composites produced by stir casting technique" by K. Amouri et al. [Mater. Sci. Eng. A 674 (2016) 569-578], Materials Science & Engineering A,
Journal of Industrial Textiles, 2020
In this work, the synergistic effect of graphene oxide and nanozirconia on the flexural and tribo... more In this work, the synergistic effect of graphene oxide and nanozirconia on the flexural and tribological properties of basalt fiber/epoxy composites was investigated. At the first step, the nanofillers were surface-modified to improve their compatibility with the epoxy matrix. Then, several laminates were fabricated by varying the filler loading. The results revealed that the multiscale composite filled with 0.1 wt.% graphene oxide + 1 wt.% nanozirconia exhibited the maximum flexural strength and wear resistance. Compared to the neat basalt fiber/epoxy composite, the wear rate and friction coefficient of the 0.1 wt.% graphene oxide + 1 wt.% nanozirconia-filled specimen were decreased by 67 and 62%, respectively, whereas the flexural strength was enhanced by 50%. Scanning electron microscopy analysis clearly showed an enhanced fiber-matrix interfacial bonding for the multiscale composite containing hybrid fillers in the matrix.
Analytical Sciences, 2020
Reagents and materials Stock standard solutions of Cd, Zn, Pb, and Ni heavy metals (1000 mg L-1) ... more Reagents and materials Stock standard solutions of Cd, Zn, Pb, and Ni heavy metals (1000 mg L-1) were purchased from Merck KGaA (Darmstadt, Germany). Sodium montmorillonite nanoclay particles were purchased from Sigma-Aldrich Co. (MO, USA). All chemicals were of analytical grade and used without further purification. 3-Aminopropyltrimetoxysilane (APMS) compound, supplied by Merck, was utilized for the surface-modification of MMT. Working standard solutions of analytes were prepared daily with dilution of the stock standard solution.
Journal of Industrial Textiles, 2019
The aim of this work was to study the influence of nano-zirconium oxide, graphene oxide, and nano... more The aim of this work was to study the influence of nano-zirconium oxide, graphene oxide, and nano-zirconium oxide + graphene oxide hybrid system on the high-velocity impact behavior and interlaminar shear strength of basalt fiber/epoxy composite. Initially, the nano-zirconium oxide and graphene oxide were functionalized by using a silane-coupling agent namely 3-aminopropyltrimethoxysilane. In order to confirm the surface functionalization of nano-zirconium oxide and graphene oxide, Fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy were carried out on both untreated and silanized fillers. Then, 15 types of specimens containing various amounts of nano-zirconium oxide (1, 2, and 3 wt.%), graphene oxide (0.1, 0.3, and 0.5 wt.%), or nano-zirconium oxide + graphene oxide hybrid in the matrix were prepared. The comparative results of the experiments showed that the specimen with 2 wt.% nano-zirconium oxide + 0.1 wt.% graphene oxide had the highest values of e...
The Journal of The Textile Institute, 2019
Multiscale composites have been investigated by the addition of silanized carbonate calcium (CaCO... more Multiscale composites have been investigated by the addition of silanized carbonate calcium (CaCO 3) as a secondary reinforcement into the matrix of carbon fiber/epoxy composites. The chemical modification of the CaCO 3 nanoparticles was confirmed by Fourier-transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Mechanical properties of the specimens were investigated by means of tensile, flexural, and compressive measurements to study the effect of treated CaCO 3 loading (0.5, 1, 3 and 5 wt.%) on their mechanical behavior. Experimental results showed that the tensile, flexural and compressive strengths of the specimen filled with 3 wt.% treated CaCO 3 composite enhanced by 14%, 36%, and 30% respectively, compared with those of neat one. The highest improvements in the mechanical moduli were observed in the multiscale composite filled with 5 wt.% treated CaCO 3. Also, the fracture surface of the specimens was further analyzed in detail.
Journal of Industrial Textiles, 2019
The current study focuses on the development of silanized graphene oxide reinforced basalt fiber/... more The current study focuses on the development of silanized graphene oxide reinforced basalt fiber/epoxy composites for enhanced tribological and viscoelastic properties. The modified-graphene oxide nanoplatelets were characterized using energy-dispersive X-ray spectroscopy, and Raman analyses. Pin-on-disk wear test and dynamic mechanical thermal analysis were conducted to determine the tribological and viscoelastic properties of the fabricated specimens with different silanized-graphene oxide loadings in the matrix (0–0.5 wt.% at a step of 0.1). The multiscale specimens were fabricated using the hand lay-up technique. The best silanized-graphene oxide loading for effectively enhancing the tribological properties was found to be 0.4 wt.%, whose wear rate and friction coefficient were 62% and 44%, respectively lower than those of the neat basalt/epoxy composite. The examination of the worn surfaces showed the enhanced basalt fiber/epoxy bonding in graphene oxide-reinforced specimen. Fr...
Fibers and Polymers, 2019
This work was carried out to study the effects of silane functionalization of graphene oxide (GO)... more This work was carried out to study the effects of silane functionalization of graphene oxide (GO) nanoplatelets and their loadings on the mechanical properties of basalt fiber (BF)/epoxy composites. At first, the GO nanoplatelets were organically modified by grafting of N-(3-trimethoxysilylpropyl)ethylenediamine (3-TMSPED) compound. The Fourier transform infrared spectroscopy (FTIR), energy-dispersive X-ray spectroscopy (EDX), and thermal gravimetric analysis (TGA) results demonstrated that silane compound can be covalently grafted to the surface of GO. The multiscale silanized graphene oxide (SGO)/BF/epoxy composites with various weight percentages of SGO in the matrix (0-0.5 wt.% in the step of 0.1) were fabricated. According to the experimental data, the 0.4 wt.% SGO-filled composite showed the maximum improvement by 18 %, 59 %, and 61 % in the tensile, flexural and compressive strengths of BF/epoxy composite, while the maximum improvement by 46 %, 54 %, and 66 % in the tensile, flexural and compressive moduli, respectively was observed for the 0.5 wt.% SGO-filled composite. Additionally, the SGO was more effective in mechanical property enhancement of fibrous composites in comparison with GO, due to its silane-functionalization. From the fracture surface examination of the specimens, it was found that the incorporation of GO or SGO improved the BF-epoxy interfacial bonding. A theoretical model based on Euler-Bernoulli beam-based method was utilized to predict the compressive properties of composites, which was in an excellent agreement with the experimental data.
Journal of Applied Polymer Science, 2019
In this study, aminopropyl trimethoxysilane as an interfacial modifier was introduced on the surf... more In this study, aminopropyl trimethoxysilane as an interfacial modifier was introduced on the surface of graphene (Gr) nanoplatelets. The effects of the silane-modified graphene (SGr) loading (0, 0.05, 0.1, 0.3, and 0.5 wt %) and silane modification on the tensile, compressive, interlaminar shear stress (ILSS), and tribological properties of the epoxy-based nanocomposites were investigated. Out of these specimens, the highest values of ILSS and compressive strength were related to the 0.3 wt % SGr-epoxy nanocomposite. The addition of SGr enhanced the tensile strength and strain to failure only at low contents (i.e., 0.05 wt %). Also, the tensile and compressive moduli were improved, and the highest values were observed at a 0.5 wt % SGr loading. In addition, decreases of approximately 40 and 68% in the coefficient of friction and wear rate, respectively, were observed at a 0.3 wt % SGr loading. Enhanced tensile, compressive, ILSS, and wear properties in the SGr-epoxy specimens were observed compared to those in the Gr-epoxy specimens.
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Papers by esmaeil tohidlou