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Overcome low intrinsic conductivity of Niox through triazinyl modification for highly efficient and stable inverted perovskite solar cells
, Article Solar RRL ; Volume 6, Issue 9 , 2022 ; 2367198X (ISSN) ; Wang, T ; Li, Y ; Pu, X ; Chen, H ; Li, Y ; Yang, B ; Zhang, Y ; Zhao, J ; Cao, Q ; Chen, X ; Ghasemi, S ; Hagfeldt, A ; Li, X ; Sharif University of Technology
John Wiley and Sons Inc
2022
Abstract
Nickel oxide (NiOx) is a promising hole transport material in inverted organic-inorganic metal halide perovskite solar cells. However, its low intrinsic conductivity hinders its further improvement in device performance. Here, we employ a trimercapto-s-triazine trisodium salt (TTTS) as a chelating agent of Ni2+ in the NiOx layer to improve its conductivity. Due to the electron-deficient triazine ring, the TTTS complexes with Ni2+ in NiOx via a strong Ni2+-N coordination bond and increases the ratio of Ni3+:Ni2+. The increased Ni3+ concentration adjusts the band structure of NiOx, thus enhancing hole density and mobility, eventually improving the intrinsic conductivity of NiOx. As a result,...
A zwitterion metal-organic framework for the removal of fluoride from an aqueous solution
, Article Journal of Chemical Sciences ; Volume 134, Issue 3 , 2022 ; 09743626 (ISSN) ; Gholami, R. M ; Borghei, S. M ; Sharif University of Technology
Springer
2022
Abstract
Excess fluoride is one of the water pollutants in the world, which is removed from water by chemical methods to produce sludge. On the other hand, techniques such as R.O. (Reverse Osmosis) also have problems with power consumption and wastewater disposal. Metal-organic frameworks are one of the newest adsorbents used to separate anions. In this study, MOF1 ({[Zn3L3(BPE)1.5]·4.5DMF}n) was used to remove fluoride from the aqueous solution. The influence of various factors such as pH, contact time, adsorbent amount, and temperature on fluoride uptake was investigated. Based on the results, the MOF synthesized in acidic media absorbs more fluoride ions. The reaction time in the first 20 min had...
Efficient and less-toxic indium-doped mapbi3 perovskite solar cells prepared by metal alloying technique
, Article Solar RRL ; Volume 6, Issue 9 , 2022 ; 2367198X (ISSN) ; Fazel, Z ; Tavakoli, R ; Akin, S ; Satapathi, S ; Prochowicz, D ; Yadav, P ; Sharif University of Technology
John Wiley and Sons Inc
2022
Abstract
Perovskite materials with ABX3 structure (A: organic, B: metal, and X: halides) have attracted tremendous attention due to their outstanding optoelectronic properties. Herein, a novel approach is developed using chemical vapor deposition (CVD), i.e., metal alloying of halide-perovskite domain via ion-transfer (MAHDI) for the growth of high-quality perovskite films, grown directly from a metal precursor. This technique easily enables us to replace the toxic Pb metal (B site) with other metals using alloying approach. Using the proposed approach, we fabricated stable and efficient Pb–In perovskite solar cells (PSCs) with a maximum power conversion efficiency (PCE) of 21.2%, which is more...
A review on catalytic reduction/degradation of organic pollution through silver-based hydrogels
, Article Arabian Journal of Chemistry ; Volume 15, Issue 9 , 2022 ; 18785352 (ISSN) ; Ali Ghasemzadeh, M ; Alipour, S ; Zamani, F ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Various challenging pollutants are produced in the environment by organic materials of diverse industries including leather, paint, and textile. Nowadays, it is vital to develop efficient manners regarding the fundamental issues and removing pollutants. Such pollutants can be effectively removed from the environment through heterogeneous catalysts. Recently, a huge deal of interest has been attracted by hydrogel-based metal catalysts as heterogeneous and efficient catalysts. In this regard, silver with its unique features is suitable for environmental remediation. Hence, the present review deals with summarizing the present advances in the synthesis of silver-based hydrogel catalysts, as...
Enhanced spatially coupling heterojunction assembled from CuCo2S4 yolk-shell hollow sphere capsulated by Bi-modified TiO2 for highly efficient CO2 photoreduction
, Article Chemical Engineering Journal ; Volume 444 , 2022 ; 13858947 (ISSN) ; Zehtab Salmasi, M ; Moradi, M ; Farshineh Saei, S ; Kakavandi, B ; Rahman Setayesh, S ; Sharif University of Technology
Elsevier B.V
2022
Abstract
The metal sulfides with highly negative reduction potential and long life-span of photocreated electrons are conducive to being exceptional candidates for CO2 photoreduction, whereas they suffer from self-photo-oxidation (or photocorrosion) that puts the greatest impediment to their practical application. Up to now, the Z-type strategy is stated as a favorable solution to overtake photocorrosion of metal sulfides, while the eligible choice for coupling with these materials is still challenging. TiO2 with more negative onset potential holds favorable inherent peculiarities over other materials, which produces overlapped potential with various ranges of metal sulfides. In this investigation,...
Generalized equivalent circuit model for analysis of graphene/metal-based plasmonic metasurfaces using Floquet expansion
, Article Optics Express ; Volume 30, Issue 20 , 2022 , Pages 35486-35499 ; 10944087 (ISSN) ; Memarian, M ; Khavasi, A ; Sharif University of Technology
Optica Publishing Group (formerly OSA)
2022
Abstract
Due to the wide range of applications of metal/graphene-based plasmonic metasurfaces (sensors, absorbers, polarizers), it has become essential to provide an analytical method for modeling these structures. An analytical solution simplified into a circuit model, in addition to greatly reducing the simulation time, can become an essential tool for designing and predicting the behaviors of these structures. This paper presents a high-precision equivalent circuit model to study these structures in one-dimensional and two-dimensional periodic arrays. In the developed model, metallic patches similar to graphene patches are modeled as surface conductivity and with the help of current modes induced...
2D MXene nanocomposites: electrochemical and biomedical applications
, Article Environmental Science: Nano ; Volume 9, Issue 11 , 2022 , Pages 4038-4068 ; 20518153 (ISSN) ; Nourmohammadi Khiarak, B ; Tao, R ; Wang, Z ; Ahmadi, S ; Hassanpour, M ; Rabiee, M ; Saeb, M. R ; Lima, E. C ; Rabiee, N ; Sharif University of Technology
Royal Society of Chemistry
2022
Abstract
In recent years, key questions about the interaction of 2D MXene nanomaterials in electrochemical and biomedical applications have been raised. Most research has focused on clarifying the exclusive properties of the materials; however, only limited reports have described the biomedical applications of 2D nanomaterials. 2D MXenes are monolayer atomic nanosheets resulting from MAX phase ceramics. The hydrophilic properties, metallic conductivity, stability, and exclusive physiochemical performances make them promising materials for electrochemical and biomedical applications, including CO2 reduction, H2 evolution, energy conversion and storage, supercapacitors, stimuli-responsive drug delivery...
Nickel-based nanosheets array as a binder free and highly efficient catalyst for electrochemical hydrogen evolution reaction
, Article International Journal of Hydrogen Energy ; Volume 47, Issue 82 , 2022 , Pages 34887-34897 ; 03603199 (ISSN) ; Hemmati, K ; Mirabbaszadeh, K ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Hydrogen technology through water electrolyzer systems has attracted a great attention to overcome the energy crisis. So, rationally designed non-noble metal based-electrocatalysts with high activity and durability can lead to high performance water electrolyzer systems and high purity hydrogen generation. Herein, a facile two-step method: hydrothermal and electrodeposition, respectively, are developed to decorate highly porous three-dimensional binder-free structure NiFeO/NiO nanosheets array on Ni foam (NiFeO/NiO/NF) with robust adhesion as a high-performance electrode for Hydrogen Evolution Reaction (HER). The electrodeposition process applied after the initial hydrothermal process...
The study on resolution factors of LPBF technology for manufacturing superelastic NiTi endodontic files
, Article Materials ; Volume 15, Issue 19 , 2022 ; 19961944 (ISSN) ; Pelevin, I. A ; Karimi, F ; Shishkovsky, I. V ; Sharif University of Technology
MDPI
2022
Abstract
Laser Powder Bed Fusion (LPBF) technology is a new trend in manufacturing complex geometric structures from metals. This technology allows producing topologically optimized parts for aerospace, medical and industrial sectors where a high performance-to-weight ratio is required. Commonly the feature size for such applications is higher than 300–400 microns. However, for several possible applications of LPBF technology, for example, microfluidic devices, stents for coronary vessels, porous filters, dentistry, etc., a significant increase in the resolution is required. This work is aimed to study the resolution factors of LPBF technology for the manufacturing of superelastic instruments for...
Trimetallic Co-Ni-Mn metal-organic framework as an efficient electrocatalyst for alkaline oxygen evolution reaction
, Article Journal of Electroanalytical Chemistry ; Volume 922 , 2022 ; 15726657 (ISSN) ; Hatami, H ; Mirzaee Valadi, F ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Designing efficient and inexpensive catalysts toward the oxygen evolution reaction (OER) is vital for achieving sustainable and green hydrogen fuel production through water electrolysis. Herein, we have synthesized several bi- and trimetallic metal–organic frameworks (MOFs) composed of Co, Ni, and Mn metals and benzene-1,3,5-tricarboxylic acid linker. The MOFs were prepared via a simple hydrothermal method, and their electrocatalytic performances in alkaline OER were investigated. A battery of analytical techniques was employed to characterize the as-synthesized materials, including field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM),...
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...
Vibration analysis of size dependent micro FML cylindrical shell reinforced by CNTs based on modified couple stress theory
, Article Arabian Journal of Chemistry ; Volume 15, Issue 10 , 2022 ; 18785352 (ISSN) ; Hooman, M ; Yarigarravesh, M ; Algarni, M ; Jade Catalan Opulencia, M ; Alsaikhan, F ; Turki Jalil, A ; Mohamed, A ; M.AboRas, K ; Lutfor Rahman, M ; Sani Sarjadi, M ; Sharif University of Technology
Elsevier B.V
2022
Abstract
In this manuscript, the sequel of agglomeration on the vibration of fiber metal laminated (FML) cylindrical shell in the micro phase using developed couple stress theory (MCST). Hamilton's principle has been carried out for deriving the non-classical equations of motion of size-dependent thin micro cylindrical shell on the basis of Love's first approximation theory. Mori-Tanaka and extended rule of mixture are utilized to estimate the mechanical attributes of carbon nanotubes (CNTs) and equivalent fiber, respectively. These four phases CNTs/fiber/polymer/metal laminated (CNTFPML) micro cylindrical shell is analyzed applying beam modal function model for several boundary limitations. Then, an...
On nonlinear free vibration of externally compressible fluid-loaded sandwich cylindrical shells: Curvature nonlinearity in bending and impermeability condition
, Article Thin-Walled Structures ; Volume 179 , 2022 ; 02638231 (ISSN) ; Fallah, F ; Ahmadian, M. T ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
A nonlinear fluid–structure interaction (FSI) model is presented for nonlinear vibration analysis of sandwich cylindrical shells subjected to an external compressible flow by considering the curvature nonlinearity in impermeability condition and bending. The sandwich shells are made of two face sheets and a central core of advanced materials including functionally graded (FG), metal foam, and anisogrid lattice composite. Based on the Kirchhoff–love hypotheses with the geometric nonlinearities in the normal strain and curvature of mid-surface, one decoupled nonlinear integral–differential equation is obtained for axisymmetric bending vibration of sandwich cylindrical shells. For the first...
Novel heterojunction magnetic composite MIL-53 (Fe)/ZnFe2O4: Synthesis and photocatalytic pollutant degradation
, Article Korean Journal of Chemical Engineering ; Volume 39, Issue 10 , 2022 , Pages 2713-2724 ; 02561115 (ISSN) ; Mahmoodi, N. M ; Ghotbi, C ; Khorasheh, F ; Sharif University of Technology
Springer
2022
Abstract
A new magnetic composite was synthesized by integration of ZnFe2O4 and MIL-53(Fe) micro-rods by a solvothermal method. This composite served as a heterogeneous catalyst to overcome the high electron-hole recombination rates of ZnFe2O4 and to enhance the degradation of Direct Red 23 under visible light irradiation. Different analytical techniques, including XRD, FTIR, SEM, DRS, VSM, and PL, were employed to characterize the synthesized heterojunction nanocomposite and to evaluate its photocatalytic activity. The ZnFe2O4/MIL-53(Fe)/Vis-light system resulted in significantly higher dye degradation as compared with pristine ZnFe2O4 and MIL-53(Fe) semiconductors at the optimum pH of 3.1 and...
Water treatment using stimuli-responsive polymers
, Article Polymer Chemistry ; Volume 13, Issue 42 , 2022 , Pages 5940-5964 ; 17599954 (ISSN) ; Roghani Mamaqani, H ; Riazi, H ; Abousalman Rezvani, O ; Sharif University of Technology
Royal Society of Chemistry
2022
Abstract
Water treatment is a process used to eliminate or reduce chemical and biological contaminants that are potentially harmful to the water supply for human use. Stimuli-responsive polymers are a new category of smart materials used in water treatment via a stimuli-induced purification process and subsequent regeneration of the polymers. Stimuli-responsive polymers dynamically change their physico-chemical properties upon environmental changes. They can undergo shrinkage or expansion, alter their optical properties, and change their electrical characteristics depending on the applied stimuli. In this context, various stimuli-responsive polymer systems such as self-assembled nanostructures,...
Microstructure, fractography, and mechanical properties of hardox 500 steel tig-welded joints by using different filler weld wires
, Article Materials ; Volume 15, Issue 22 , 2022 ; 19961944 (ISSN) ; Haowei, M ; Yarigarravesh, M ; Assari, A. H ; Tayyebi, M ; Tayebi, M ; Hamawandi, B ; Sharif University of Technology
MDPI
2022
Abstract
This paper deals with the effects of three low-carbon steel filler metals consisting of ferritic and austenitic phases on the weld joints of the tungsten inert gas (TIG) welding of Hardox 500 steel. The correlation between the microstructure and mechanical properties of the weld joints was investigated. For this purpose, macro and microstructure were examined, and then microhardness, tensile, impact, and fracture toughness tests were carried out to analyze the mechanical properties of joints. The results of optical microscopy (OM) images showed that the weld zones (WZ) of all three welds were composed of different ferritic morphologies, including allotriomorphic ferrite, Widmanstätten...
An investigation of shear failure in welded channel and angle brace members
, Article Structures ; Volume 45 , 2022 , Pages 1287-1306 ; 23520124 (ISSN) ; Maleki, S ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Shear yielding (SY) and shear rupture (SR) are base metal failure modes in welded connections of brace members to gusset plates. Although gusset plated connections have been extensively investigated in the past nonetheless, the shear failure limit states of welded brace members have not received significant attention. This paper aims to shed some light on the shear failure mechanism and strength of welded brace members consisting of single and double channels and angles. For this purpose, a nonlinear finite element (FE) model with ductile damage simulation is developed and validated against the authors’ experiments and other available test results. Then an extensive parametric study using...
Conventional vs. temperature-gradient transient liquid phase bonding of stainless steel 304 using a multi-component (Fe–Ni–Mo–B) filler metal
, Article Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science ; Volume 53, Issue 11 , 2022 , Pages 4081-4100 ; 10735623 (ISSN) ; Ekrami, A ; Sharif University of Technology
Springer
2022
Abstract
The application of the multi-component Fe-based filler metals (FMs) for transient liquid phase (TLP) bonding of AISI 304 austenitic stainless steel has been overshadowed by dissimilar interlayers merely due to their shorter isothermal solidification time. However, the latter usually suffers from low efficiency in terms of mechanical properties even after homogenization of heat treatment. This study shows that by imposing a temperature gradient across the bond line during the TLP bonding process (TG-TLP), it is possible to reduce the isothermal solidification time significantly. This renews the interest in utilizing multi-component Fe-based FMs. In this regard, the TG-TLP bonding process was...
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...