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Compaction simulation of crystalline nano-powders under cold compaction process with molecular dynamics analysis
, Article Powder Technology ; Volume 373 , August , 2020 , Pages 741-753 ; Sameti, A. R ; Mofatteh, H ; Sharif University of Technology
Elsevier B. V
2020
Abstract
In this paper, the uniaxial cold compaction process of metal nano-powders is numerically analyzed through the Molecular Dynamics (MD) method. The nano-powders consist of nickel and aluminum nano-particles in the pure and mixed forms with distinctive contributions. The numerical simulation is performed using the different number of nano-particles, mixing ratios of Ni and Al nano-particles, compaction velocities, and ambient temperatures in the canonical ensemble until the full-dense condition is achieved. In the MD analysis, the inter-atomic interaction between metal nano-particles is modeled by the many-body EAM potential, and the interaction between frictionless rigid die-walls and metal...
Metal organic framework nanoparticles loaded- PVDF/chitosan nanofibrous ultrafiltration membranes for the removal of BSA protein and Cr(VI) ions
, Article Journal of Molecular Liquids ; Volume 317 , 2020 ; Koushkbaghi, S ; Hosseini, S. S ; Darabi, M ; Yousefi, A ; Irani, M ; Sharif University of Technology
Elsevier B.V
2020
Abstract
The UiO-66 NH2 and ZIF-8 metal organic framework nanoparticles (NMOFs) were incorporated into the polyvinylidene fluoride (PVDF) nanofibrous membrane. Then, the chitosan nanofibers were coated on the PVDF nanofibers to produce the PVDF/chitosan nanofibers. The performance of synthesized PVDF/NMOFs single layer and PVDF/chitosan/NMOFs two layers nanofibrous membranes was investigated for BSA protein molecules and Cr(VI) ions separation via ultrafiltration membrane process. The potential of synthesized nanofibers was also examined for BSA and Cr(VI) adsorption in a batch system. The characteristics of synthesized nanofibrous membranes were determined using SEM, EDX, TGA, BET, porosity and...
Sensitive voltammetric detection of melatonin in pharmaceutical products by highly conductive porous graphene-gold composites
, Article ACS Sustainable Chemistry and Engineering ; 2020 ; Hemmati, A ; Mohammadi, R ; Hatamie, A ; Tamjid, E ; Simchi, A ; Sharif University of Technology
American Chemical Society
2020
Abstract
This work presents a novel melatonin sensor based on unfunctionalized macroporous graphene networks decorated with gold nanoparticles for the differential pulse voltammetric detection of melatonin in pharmaceutical products. Highly porous graphene structures were prepared by metallic template-assisted chemical vapor deposition, and their active surface area and electrocatalytic activity were improved by electrochemical deposition of gold nanoparticles (50-250 nm) on their struts. The graphene-gold electrodes present a highly sensitive performance toward electro-oxidation of melatonin with a wide linear range of 0.05-50 μM, a low detection limit of 0.0082 μM (3σ/m), and a significant...
Magnetic CoFe2O4 nanoparticles doped with metal ions: A review
, Article Ceramics International ; Volume 46, Issue 11 , 2020 , Pages 18391-18412 ; Moradi, M ; Parvin, N ; Nemati, A ; Jafari Rad, A ; Sheysi, N ; Abouchenari, A ; Mohammadi, A ; Karbasi, S ; Ahmadi, Z ; Esmaeilkhanian, A ; Irani, M ; Pakseresht, A ; Sahmani, S ; Shahedi Asl, M ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Ceramic-magnetic nanoparticles (CMNPs) are attracting attention due to their various applications, especially in biomedical industries. Among them, spinel ferrite CMNPs have received considerable deliberations among different spinel metal oxides due to their fascinating characteristics. Spinel ferrite CMNPs are used for enhancement of the applicability of CMNPs without affecting the intrinsic advantages of iron oxide CMNPs. Spinel ferrites with doping agents have useful electrical and magnetic properties in various fields. Moreover, the replacement of metallic atoms in ferrites is promising to manipulate physical characteristics and improve their performance. Among different spinel ferrites,...
Green synthesis of Ag–Pt bimetallic nanoparticles supported on the Metal–Organic framework (MOF)–Derived metal oxides (γ-Fe2O3/CuO) nanocomposite as a reusable heterogeneous nanocatalyst and nanophotocatalyst
, Article Materials Chemistry and Physics ; Volume 261 , 2021 ; 02540584 (ISSN) ; Taheri, M ; Gholami, M. R ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
The heterogeneous environmentally friendly catalyst and photocatalyst based on Ag, Pt, Ag–Pt nanoparticles (NPs) loading on the γ-Fe2O3/CuO nanocomposite which was derived from Fe-metal organic framework (Fe-MIL-88B) and Cu-metal organic framework (Cu (tpa)) was introduced. The catalytic and photocatalytic activities of Ag–Pt loading on the γ-Fe2O3/CuO nanocomposite were performed for a reduction process (4-nitrophenol (4-Nip) to 4-aminophenol (4-Amp)), and decomposition organic dyes (AB92, MB) in the LED light. Metal-organic framework (MOFs) composed with inorganic and organic linker which used as suitable precursors to obtain different type of nanostructures for environmental applications....
Effect of Gd and Co contents on the microstructural, magneto-optical and electrical characteristics of cobalt ferrite (CoFe2O4) nanoparticles
, Article Ceramics International ; 2021 ; 02728842 (ISSN) ; Yousaf, M ; Akhtar, M. N ; Noor, A ; Akbar, M ; Shah, M. A. K. Y ; Yan, S ; Wang, F ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Rare earth oxides with a trivalent nature play a pivotal role in reinforcing the magneto-optical attributes of spinel ferrite nanoparticles by replacing Fe3+ ions. In this study, rare earth Gd oxide doped with CoFe2O4 NPs with a composition of Co1+xGdxFe2-2xO4 (x = 0, 0.05, 0.10, and 0.15) were synthesized using sol-gel auto-combustion. The outcome of Gd cations on the physical, magneto-optical and electrical characteristics of the cobalt ferrite NPs were reported. X-ray diffraction (XRD), and Fourier transform infrared (FTIR) investigations confirmed the single-phase cubic crystalline nature and metal ion stretching in the cobalt ferrite synthesized samples. Decreasing drift in the average...
Diatoms with invaluable applications in nanotechnology, biotechnology, and biomedicine: Recent advances
, Article ACS Biomaterials Science and Engineering ; Volume 7, Issue 7 , 2021 , Pages 3053-3068 ; 23739878 (ISSN) ; Khatami, M ; Jamalipour Soufi, G ; Fatahi, Y ; Iravani, S ; Varma, R. S ; Sharif University of Technology
American Chemical Society
2021
Abstract
Diatoms are unicellular microalga found in soil and almost every aquatic environment (marine and fresh water). Biogenic silica and diatoms are attractive for biotechnological and industrial applications, especially in the field of biomedicine, industrial/synthetic manufacturing processes, and biomedical/pharmaceutical sciences. Deposition of silica by diatoms allows them to create micro- or nanoscale structures which may be utilized in nanomedicine and especially in drug/gene delivery. Diatoms with their unique architectures, good thermal stability, suitable surface area, simple chemical functionalization/modification procedures, ease of genetic manipulations, optical/photonic...
Gold nanoparticles loaded into niosomes: A novel approach for enhanced antitumor activity against human ovarian cancer
, Article Advanced Powder Technology ; Volume 32, Issue 12 , 2021 , Pages 4711-4722 ; 09218831 (ISSN) ; Ferdowsian, S ; Hajrasouliha, S ; Kazempoor, R ; Mirzaie, A ; Sedigh Dakkali, M ; Akbarzadeh, I ; Mohammadmahdi Meybodi, S ; Mirghafouri, M ; Sharif University of Technology
Elsevier B.V
2021
Abstract
In the current study, gold nanoparticles (AuNPs) were prepared using the green synthesis method using Artemisia annua extract, loaded into niosomes, and investigated their cytotoxicity and apoptotic effects. To optimize the niosomal formulation containing AuNPs, the effects of surfactants: cholesterol molar ratio, Span 60: Tween 60 M ratio, and AuNP concentration (µg/mL) were investigated. After examining the drug release profile, mathematical models were assessed to predict release kinetic. The cytotoxicity of noisome encapsulated AuNPs and free AuNPs was evaluated against human ovarian cancer cell line (A2780) by MTT assay. The apoptotic/necrosis ratio was studied using flow cytometry as...
CO2/CH4 separation by mixed-matrix membranes holding functionalized NH2-MIL-101(Al) nanoparticles: Effect of amino-silane functionalization
, Article Chemical Engineering Research and Design ; Volume 176 , 2021 , Pages 49-59 ; 02638762 (ISSN) ; Ahmadijokani, F ; Molavi, H ; Rezakazemi, M ; Arjmand, M ; Sharif University of Technology
Institution of Chemical Engineers
2021
Abstract
In this study, NH2-MIL-101(Al) metal-organic frameworks (MOFs) covered with 3-aminopropyltriethoxysilane (APTES) were incorporated into the polyethersulfone (PES) to produce mixed-matrix membranes (MMMs) for CO2 separation. The APTES functionalization was performed to improve the MOF dispersion in the PES matrix. Different analyses such as X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and field emission scanning electron microscopy (FESEM) revealed that the MOFs surface successfully functionalized with APTES. An improvement in CO2/CH4 separation efficiency was observed in MMMs, and the performance...
Magnetic Fe3O4@UiO-66 nanocomposite for rapid adsorption of organic dyes from aqueous solution
, Article Journal of Molecular Liquids ; Volume 322 , 2021 ; 01677322 (ISSN) ; Heidarian Haris, M ; Ahmadijokani, F ; Jarahiyan, A ; Molavi, H ; Matloubi Moghaddam, F ; Rezakazemi, M ; Arjmand, M ; Sharif University of Technology
Elsevier B.V
2021
Abstract
Human society is becoming more intransigent on removing organic dyes from polluted water before discharging to the environment. To fulfill this goal, a magnetic metal-organic framework adsorbent based on functionalized magnetic Fe3O4 nanoparticles and highly water stable UiO-66 with high porosity and sensitivity to the external magnetic field was designed and synthesized via an easy step-by-step self-assembly technique. The synthesized adsorbent magnetic nanoparticles (Fe3O4@UiO-66) were applied to remove organic dyes, i.e., methyl orange (MO) and methylene blue (MB), from a contaminated aqueous solution. The experiments displayed that magnetic Fe3O4@UiO-66 has good adsorption uptake for MO...
CO2/CH4 separation by mixed-matrix membranes holding functionalized NH2-MIL-101(Al) nanoparticles: Effect of amino-silane functionalization
, Article Chemical Engineering Research and Design ; Volume 176 , 2021 , Pages 49-59 ; 02638762 (ISSN) ; Ahmadijokani, F ; Molavi, H ; Rezakazemi, M ; Arjmand, M ; Sharif University of Technology
Institution of Chemical Engineers
2021
Abstract
In this study, NH2-MIL-101(Al) metal-organic frameworks (MOFs) covered with 3-aminopropyltriethoxysilane (APTES) were incorporated into the polyethersulfone (PES) to produce mixed-matrix membranes (MMMs) for CO2 separation. The APTES functionalization was performed to improve the MOF dispersion in the PES matrix. Different analyses such as X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and field emission scanning electron microscopy (FESEM) revealed that the MOFs surface successfully functionalized with APTES. An improvement in CO2/CH4 separation efficiency was observed in MMMs, and the performance...
Magnetic Fe3O4@UiO-66 nanocomposite for rapid adsorption of organic dyes from aqueous solution
, Article Journal of Molecular Liquids ; Volume 322 , 2021 ; 01677322 (ISSN) ; Heidarian Haris, M ; Ahmadijokani, F ; Jarahiyan, A ; Molavi, H ; Matloubi Moghaddam, F ; Rezakazemi, M ; Arjmand, M ; Sharif University of Technology
Elsevier B.V
2021
Abstract
Human society is becoming more intransigent on removing organic dyes from polluted water before discharging to the environment. To fulfill this goal, a magnetic metal-organic framework adsorbent based on functionalized magnetic Fe3O4 nanoparticles and highly water stable UiO-66 with high porosity and sensitivity to the external magnetic field was designed and synthesized via an easy step-by-step self-assembly technique. The synthesized adsorbent magnetic nanoparticles (Fe3O4@UiO-66) were applied to remove organic dyes, i.e., methyl orange (MO) and methylene blue (MB), from a contaminated aqueous solution. The experiments displayed that magnetic Fe3O4@UiO-66 has good adsorption uptake for MO...
Stable Photodetectors based on fstable photodetectors based on formamidinium lead iodide quantum well perovskite nanoparticles fabricated with excess organic cations.ormamidinium lead iodide quantum well perovskite nanoparticles fabricated with excess organic cations
, Article ACS Applied Nano Materials ; Volume 4, Issue 8 , 2021 , Pages 7788-7799 ; 25740970 (ISSN) ; Mohammadi, M ; Rezaei, N.T ; Aynehband, S ; Shooshtari, L ; Mohammadpour, R ; Simchi, A ; Sharif University of Technology
American Chemical Society
2021
Abstract
Metal halide perovskite nanoparticles have recently attracted immense interest for photodetectors due to their outstanding optical and electronic properties such as high carrier diffusion length, tunable band gap (light absorption range), and high photoluminescence (PL) efficiency. Although significant progress has been achieved in the development of perovskites, their stability is yet to be addressed. To improve the stability and quantum efficiency of FAPbI3 perovskite nanocrystals, we present a room temperature protocol to fabricate fully passivated and stable FAPbI3 nanocrystals via 2D growth in the presence of amine ligands and an excess amount of the organic cations. The crystallization...
Utilizing graphene oxide/gold/methylene blue ternary nanocomposite as a visible light photocatalyst for a plasmon-enhanced singlet oxygen generation
, Article Reaction Kinetics, Mechanisms and Catalysis ; Volume 135, Issue 5 , 2022 , Pages 2851-2865 ; 18785190 (ISSN) ; Kazemeini, M ; Sharif University of Technology
Springer Science and Business Media B.V
2022
Abstract
In this study, graphene oxide/gold/methylene blue (GO/Au/MB) ternary composites were synthesized and characterized through UV–vis, FTIR, XRD, XPS, SEM, and TEM analyses towards plasmon-enhanced singlet oxygen (1O2) generation. Through using gold nanoparticles and MB photosensitizers, the visible light adsorption capability of GO was enhanced by 115%. Moreover, applying this ternary composite as a photocatalyst under visible light interestingly revealed a drastic step-increase of 14% (i.e., from 9 to 23%) in the conversion of photooxygenation of Anthracene. This behavior was rationalized using finite-difference time-domain (FDTD) simulations which confirms the plasmonic field of gold...
In situ polymerization of curcumin incorporated polyurethane/zinc oxide nanocomposites as a potential biomaterial
, Article Reactive and Functional Polymers ; Volume 180 , 2022 ; 13815148 (ISSN) ; Athir, N ; Shehzad, F. K ; Cheng, J ; Gao, F ; Zhang, J ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Curcumin incorporated polyurethanes (CPU) are gaining much attention as a biomaterial. However, challenges are still remained due to hydrophobicity and low mechanical strength of CPU. Herein, we synthesized the CPU/ZnO nanocomposites with good mechanical and improved hydrophilic properties via in-situ polymerization. A series of curcumin incorporated polyurethane with different concentrations of ZnO nanoparticles (ZnCPU) are synthesized by using the curcumin, polyethylene glycol (PEG) as the soft segment, hexamethylene diisocyanate (HDI) as the hard segment, and 1,4-butanediol (BDO) as the chain extender. The addition of ZnO nanoparticles (NPs) facilitated the soft domain of PU which is...
Magneto-fluorescent contrast agents based on carbon Dots@Ferrite nanoparticles for tumor imaging
, Article Journal of Magnetism and Magnetic Materials ; Volume 561 , 2022 ; 03048853 (ISSN) ; Dehghani, H ; Angizi, S ; Ramedani, A ; Dolatyar, B ; Ramezani Farani, M ; Müllen, K ; Simchi, A ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Bimodal magnetic-fluorescent materials for diagnostic imaging needs surface-engineered nanoparticles with great biosafety, pronounced colloidal stability, high magnetic moments, and strong photoluminescence (PL) emission. This work presents polymer-coated nanoparticles (PCNPs) based on manganese ferrites covered with a thin shell of nitrogen-doped carbon dots for magnetic-resonance and fluorescent dual mode imaging of cancerous tumors in vivo. An in situ thermolysis of metal oxalates and phenylenediamine in diphenyl ether allows for the facile synthesis of hybrid magneto-fluorescent nanoparticles. They possess an average size of 55 ± 5 nm with strong and excitation-independent PL emission at...
Conversion of CO into CO2 by high active and stable PdNi nanoparticles supported on a metal-organic framework
, Article Frontiers of Chemical Science and Engineering ; Volume 16, Issue 7 , 2022 , Pages 1139-1148 ; 20950179 (ISSN) ; Karimi Sabet, J ; Abbasi, Z ; Ghotbi, C ; Sharif University of Technology
Higher Education Press Limited Company
2022
Abstract
The solubility of Pd(NO3)2 in water is moderate whereas it is completely soluble in diluted HNO3 solution. Pd/MIL-101(Cr) and Pd/MIL-101-NH2(Cr) were synthesized by aqueous solution of Pd(NO3)2 and Pd(NO3)2 solution in dilute HNO3 and used for CO oxidation reaction. The catalysts synthesized with Pd(NO3)2 solution in dilute HNO3 showed lower activity. The aqueous solution of Pd(NO3)2 was used for synthesis of mono-metal Ni, Pd and bimetallic PdNi nanoparticles with various molar ratios supported on MOF. Pd70Ni30/MIL-101(Cr) catalyst showed higher activity than monometallic counterparts and Pd + Ni physical mixture due to the strong synergistic effect of PdNi nanoparticles, high distribution...
Microstructural characterization and enhanced tensile and tribological properties of Cu-SiC nanocomposites developed by high-pressure torsion
, Article Journal of Materials Research and Technology ; Volume 20 , 2022 , Pages 4038-4051 ; 22387854 (ISSN) ; Gharibi Asl, F ; Mousa Mirabad, H ; Kim, H. S ; Sharif University of Technology
Elsevier Editora Ltda
2022
Abstract
In this study, an attempt has been made to fabricate Cu-SiC nanocomposites by flake powder metallurgy and high-pressure torsion processing techniques at room temperature. Pure Cu and a mixture of Cu and nano-sized SiC powders were mechanically milled separately for 3 h and then green compacts were prepared by uniaxial pressing under 1 GPa pressure. The green compacts experienced 6-turn high-pressure torsion under a pressure of 6 GPa to prepare bulk Cu and Cu-SiC samples. The microstructures of the consolidated samples were characterized using an X-ray diffractometer and a high resolution scanning/transmission electron microscope, and the mechanical properties were evaluated by microhardness,...
Silver and gold nanoparticles for antimicrobial purposes against multi-drug resistance bacteria
, Article Materials ; Volume 15, Issue 5 , 2022 ; 19961944 (ISSN) ; Ahmadi, S ; Akhavan, O ; Luque, R ; Sharif University of Technology
MDPI
2022
Abstract
Several pieces of research have been done on transition metal nanoparticles and their nanocomplexes as research on their physical and chemical properties and their relationship to biological features are of great importance. Among all their biological properties, the antibacterial and antimicrobial are especially important due to their high use for human needs. In this article, we will discuss the different synthesis and modification methods of silver (Ag) and gold (Au) nanoparticles and their physicochemical properties. We will also review some state-of-art studies and find the best relationship between the nanoparticles’ physicochemical properties and potential antimicrobial activity. The...
Plasmon-enhanced photocatalytic activity in the visible range using AgNPs/polydopamine/graphitic carbon nitride nanocomposite
, Article Applied Surface Science ; Volume 585 , 2022 ; 01694332 (ISSN) ; Amirjani, A ; Reza Madaah Hosseini, H ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Developing an efficient visible-light-driven photocatalyst is believed to be a practical solution for clean energy and environmental remediation. The present study aimed to broaden current knowledge of the graphitic carbon nitride (g-C3N4)-based plasmonic photocatalysts by decorating polydopamine-grafted g-C3N4 (PDA/g-C3N4) with silver nanoparticles (AgNPs). The nanocomposite was prepared using a facile synthesis method, while XPS and microscopy measurements confirmed the homogenous dispersion of AgNPs on PDA/g-C3N4. AgNPs successfully reduced the recombination rate of photoinduced electron-hole pairs. The calculated bandgap energy was decreased from 2.7 eV for pure g-C3N4 to 2.1 eV for...