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investigation of Microstructure and Corrosion of TiNbTaZrMo High-Entropy Alloy in the Simulated Body Fluid

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Journal of Bionic Engineering 2021年第1期18卷 118-127页

作者： Arash Shokrgozar Navi Shahram Etemadi Haghighi Mohammad Haghpanahi Amir momeni Deparment of mechanical engineering Science and Research branchIslamic Azad UniversityTehran ***Oran Department of mechanical engineering Iran University of Science and TechnologyTehran 13114-16846Iran Materials Science and Engineering Department Hamedan University of TechnologyHlamedan ***Iran

Microstructures and corrosion of TiNbTaZrMo(Ti_(20)Nb_(20)Ta_(20)Zr_(20)Mo_(20))High-Entropy Alloy(HEA)were investigated in the Simu-lated Body Fluid(SBF).Microstructure of this alloy was investigated by X-Ray Difiraction(XRD)and Scanning Electron Microscopy(SEM)*** observations confirmed the presence of two bcc phases as the major matrix as well as another minor phase in themicrostructure of the *** of some elements,such as tantalum,niobium,and molybdenum in the dendritic branches and thepresence of zirconium and titanium in the inter-dendritic branches were clearly evidenced by Energy Dispersive X-ray(EDX)*** importance of corrosion of implant alloys in the human's body,elctrochemical impedance and cyclic polarization tests werepcerformed on the alloy in *** the corrosion tests,corrosion potential,current,and resistance were obtained as E_(corr)=-0.42 V,i_(corr)=0.34μA·cm^(-2),and R_(p)=27.44 k ohm·cm^(2),*** results revealed that the rate of corrosion in TiNbTaZrMo HEA is about 26 times better than that of Ti_(6)Al_(4)V ***,both alloys had no pitting corrosion in the SBF solution.

关键词： HEA SBF implant material electrochemical impedance test Nyquist polarization test

WO3修饰TiO2纳米管阵列制备、表征及光催化活性(英文)

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稀有金属材料与工程 2016年第11期45卷 2779-2783页

作者： Mohamad Mohsen momeni 伊斯法罕理工大学伊朗伊斯法罕84156-83111

利用化学浴沉积（CBD）结合热解工艺制备了WO3修饰TiO2纳米管（WTN）阵列,且WTN阵列分布均匀。通过改变沉积时间可调整WTN的钨含量。利用SEM、EDX、XRD对WTN进行了表征。结果表明,阴极氧化后,TiO2纳米管生长于钛体基体上,纳米管的内径为... 详细信息

利用化学浴沉积（CBD）结合热解工艺制备了WO3修饰TiO2纳米管（WTN）阵列,且WTN阵列分布均匀。通过改变沉积时间可调整WTN的钨含量。利用SEM、EDX、XRD对WTN进行了表征。结果表明,阴极氧化后,TiO2纳米管生长于钛体基体上,纳米管的内径为90120 nm,外径为120160 nm,壁厚在3060 nm范围,长约39μm。经C.i.硫化红14的有效去除证实,修饰TiO2纳米管的WO3增强了WTN光催化活性,在可见光照射下,所制备复合膜光催化活性优于未修饰纳米管阵列（TN）。

关键词：纳米管薄膜阳极氧化光催化剂

Hot workability of cast and wrought Ni-42Cu alloy through hot tensile and compression tests

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Transactions of Nonferrous Metals Society of China 2016年第6期26卷 1589-1597页

作者： M.ARJM S.M.ABBASi A.KARiMi TAHERi A.momeni Department of Materials Science and Technology Sharif University of Technology Metallic Materials Research Center Maleke Ashtar University of Technology Department of Materials Science and Engineering Hamedan University of Technology

in order to analyze the flow behavior and workability of Ni-42Cu in cast and wrought conditions, hot deformation tests were performed at temperatures and strain rates within the ranges of 900-1150 ℃ and 0.001-1 s^-1, respectively. Tensile tests showed a “hot ductility trough” at 950 ℃ for both alloys. The drop in hot ductility was more considerable in the cast alloy because of the sluggish dynamic recrystallization. The hot ductility drop and grain boundary cracking, particularly in the cast alloy, were attributed to the segregation of detrimental atoms to the boundaries. it was shown that the hot ductility of the wrought alloy could be improved with increasing strain rate. it was associated with increasing the fraction of dynamic recrystallization at higher strain rates. This finding corroborated the change in the mechanism of dynamic recrystallization with strain rate. The strain rate sensitivity and instability parameters calculated for the wrought alloy showed that the material is prone to strain localization at low temperatures, i.e., 950-1050 ℃, and high strain rates of 0.1 and 1 s-1. Based on the tensile and compression tests, the best temperature range for a desirable hot workability was introduced as 1050-1150 ℃.

关键词： Ni-Cu alloy hot ductility mechanical properties dynamic recrystallization hot compression formability

A computational framework for guiding the MOCVD-growth of wafer-scale 2D materials

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npj Computational Materials 2022年第1期8卷 2300-2307页

作者： Kasra momeni Yanzhou Ji Nadire Nayir Nuruzzaman Sakib Haoyue Zhu Shiddartha Paul Tanushree H.Choudhury Sara Neshani Adri C.T.van Duin Joan M.Redwing Long-Qing Chen Department of Mechanical Engineering The University of AlabamaTuscaloosa35487ALUSA Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity Park16802PAUSA Department of Mechanical Engineering Pennsylvania State UniversityUniversity Park16802PAUSA 2-Dimensional Crystal Consortium(2DCC)Materials innovation Platform Materials Research InstituteThe Pennsylvania State UniversityUniversity ParkPA16802USA Department of Physics Karamanoglu Mehmetbey UniversityKaraman70000Turkey Department of Electrical Engineering The University of AlabamaTuscaloosa35487ALUSA

Reproducible wafer-scale growth of two-dimensional(2D)materials using the Chemical Vapor Deposition(CVD)process with precise control over their properties is challenging due to a lack of understanding of the growth mechanisms spanning over several length scales and sensitivity of the synthesis to subtle changes in growth conditions.A multiscale computational framework coupling Computational Fluid Dynamics(CFD),Phase-Field(PF),and reactive Molecular Dynamics(MD)was developed–called the CPM model–and experimentally *** between theoretical predictions and thorough experimental measurements for a Metal-Organic CVD(MOCVD)-grown WSe_(2)model material revealed the full power of this computational ***-area uniform 2D materials are synthesized via MOCVD,guided by computational *** developed computational framework provides the foundation for guiding the synthesis of wafer-scale 2D materials with precise control over the coverage,morphology,and properties,a critical capability for fabricating electronic,optoelectronic,and quantum computing devices.

关键词： MOCVD precise synthesis

interventions of natural and synthetic agents in inflammatory bowel disease, modulation of nitric oxide pathways

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World Journal of Gastroenterology 2020年第24期26卷 3365-3400页

作者： Aida Kamalian Masoud Sohrabi Asl Mahsa Dolatshahi Khashayar Afshari Shiva Shamshiri naza.in momeni roudsa.i Saeideh Momtaz Roja Rahimi Mohammad Abdollahi Amir Hossein Abdolghaffari Department of Medicine Tehran University of Medical SciencesTehran ***Iran Students'Scientific Research Center Tehran University of Medical SciencesTehran ***Iran Department of Traditional Pharmacy School of Persian MedicineTehran University of Medical SciencesTehran ***Iran Department of Toxicology and Pharmacology Faculty of PharmacyTehran Medical SciencesIslamic Azad UniversityTehran ***Iran Medicinal Plants Research Center Institute of Medicinal PlantsACECRTehran ***Iran Toxicology and Diseases Group(TDG) Pharmaceutical Sciences Research Center(PSRC)The Institute of Pharmaceutical Sciences(TIPS)and Department of Toxicology and PharmacologySchool of PharmacyTehran University of Medical SciencesTehran ***Iran Gastrointestinal Pharmacology interest Group Universal Scientific Education and Research NetworkTehran ***Iran Department of Toxicology and Pharmacology Faculty of PharmacyTehran University of Medical SciencesTehran ***Iran

inflammatory bowel disease(iBD)refers to a group of disorders characterized by chronic inflammation of the gastrointestinal(Gi)*** elevated levels of nitric oxide(NO)in serum and affected tissues;mainly synthesized by the inducible nitric oxide synthase(iNOS)enzyme;can exacerbate Gi inflammation and is one of the major biomarkers of Gi *** natural and synthetic agents are able to ameliorate Gi inflammation and decrease iNOS expression to the extent comparable with some iBD ***,the purpose of this study was to gather a list of natural or synthetic mediators capable of modulating iBD through the NO *** databases including Google Scholar and PubMed were searched from 1980 to May *** found that polyphenols and particularly flavonoids are able to markedly attenuate NO production and iNOS expression through the nuclear factorκB(NF-κB)and JAK/STAT signaling *** and probiotics can also alter the Gi microbiota and reduce NO expression in iBD models through a broad array of mechanisms.A number of synthetic molecules have been found to suppress NO expression either dependent on the NF-κB signaling pathway(i.e.,dexamethasone,pioglitazone,tropisetron)or independent from this pathway(i.e.,nicotine,prednisolone,celecoxib,β-adrenoceptor antagonists).Co-administration of natural and synthetic agents can affect the tissue level of NO and may improve iBD symptoms mainly by modulating the Toll like receptor-4 and NF-κB signaling pathways.

关键词： inflammatory bowel disease Ulcerative colitis Crohn’s disease Nitric oxide Nuclear factor-κB Natural or synthetic mediators

Multiscale computational understanding and growth of 2D materials:a review

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npj Computational Materials 2020年第1期6卷 1484-1501页

作者： Kasra momeni Yanzhou Ji Yuanxi Wang Shiddartha Paul Sara Neshani Dundar E.Yilmaz Yun Kyung Shin Difan Zhang Jin-Wu Jiang Harold S.Park Susan Sinnott Adri van Duin Vincent Crespi Long-Qing Chen Mechanical Engineering Department Louisiana Tech UniversityRustonLA 71272USA Department of Mechanical Engineering University of AlabamaTuscaloosaALUSA institute for Micromanufacturing Louisiana Tech UniversityRustonLAUSA Materials Research institute The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA 16802USA 2-Dimensional Crystal Consortium The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Physics The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Electrical Engineering Iowa State UniversityAmesIA 50010USA Mechanical Engineering Department The Pennsylvania State UniversityUniversity ParkPA 16802USA Shanghai institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringShanghai UniversityShanghai 200072China Department of Mechanical Engineering Boston UniversityBostonMA 02215USA Department of Engineering Science and Mechanics The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Mathematics The Pennsylvania State UniversityUniversity ParkPA 16802USA

The successful discovery and isolation of graphene in 2004,and the subsequent synthesis of layered semiconductors and heterostructures beyond graphene have led to the exploding field of two-dimensional(2D)materials that explore their growth,new atomic-scale physics,and potential device *** review aims to provide an overview of theoretical,computational,and machine learning methods and tools at multiple length and time scales,and discuss how they can be utilized to assist/guide the design and synthesis of 2D materials beyond graphene.

关键词： synthesis utilized subsequent