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Magnesium oxide(MgO)nanoadsorbents in wastewater treatment:A comprehensive review

Journal of Magnesium and Alloys 2024年第5期12卷 1709-1773页

作者： H.c.s.Perera V.gurunanthanan Anoop singh M.M.M.g.P.g.Mantilaka g.Das sandeep Arya Department of Physics Khalifa UniversityAbu Dhabi12788United Arab Emirates Postgraduate Institute of science University of PeradeniyaPeradeniyaSri Lanka Department of Humanities and sciences Guru Nanak Institutions Technical CampusIbrahimpatnamHyderabad501506India centre for global Health Research Saveetha Medical College and HospitalsSaveetha Institute of Medical and Technical SciencesChennai602105Tamil NaduIndia Department of Physics University of JammuJammu and Kashmir180006India

Wastewater contamination by heavy metals and synthetic dyes presents a significant environmental challenge,necessitating effective and sustainable separation *** review article provides a detailed examination of magnesium oxide(MgO)nanoparticles as an innovative nanoadsorbent for wastewater treatment,with a specific focus on heavy metal and dye *** review comprehensively explores various aspects of MgO nanoparticles,including their structural characteristics and synthesis *** article delves into the morphology and crystallographic arrangement of MgO nanoparticles,offering insights into their structural *** the complexity of adsorption processes,the review identifies and analyzes parameters influencing the adsorption efficiency of MgO nanoparticles,such as temperature,pH,contact time,initial concentration,and co-existing *** interplay between these parameters and the adsorption capability of MgO nanoparticles emphasizes the importance of optimizing operational ***,the review assesses various synthesis methods for MgO nanoparticles,including sol-gel,hydrothermal,precipitation,green synthesis,solvothermal,and template-assisted *** discusses the advantages,limitations,and resulting nanoparticle characteristics of each method,enabling readers to grasp the implications of synthesis processes on adsorption *** comprehensive review consolidates current insights into the effectiveness of MgO nanoparticles as a potent nanoadsorbent for removing heavy metals and dyes from wastewater covering a wide spectrum of aspects related to MgO ***,there is a need to investigate the use of MgO in the treatment of actual wastewater or river water,in order to leverage its cost-effectiveness and high efficiency for practical water treatment applications in real-time.

关键词： MgO nanoparticles Nanoadsorbent Wastewater treatment Heavy metals Dye separation Adsorption synthesis methods

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New insights into the hardening and pitting corrosion mechanisms of thermally aged duplex stainless steel at 475℃:A comparative study between 2205 and 2101 steels

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Journal of Materials science & Technology 2022年第3期98卷 123-135页

作者： R.silva g.s.Vacchi c.L.Kugelmeier I.g.R.santos A.A.Mendes Filho D.c.c.Magalhães c.R.M.Afonso V.L.sordi c.A.D.Rovere Munir Rachid corrosion Laboratory Department of Materials EngineeringFederal University of São CarlosRodovia Washington Luis Km 23513565-905 São CarlosSPBrazil Engineering Modeling and Applied Social Sciences Center(CECS)Federal University of ABCAvenida dos Estados 500109210580 Santo AndréSPBrazil Federal University of são carlos Graduate Program in Materials Science and EngineeringBrazil

In this study,the relationship between spinodal decomposition and the formation of Ni-rich clusters and g-phase in the ferrite on hardening and pitting corrosion of two thermally aged duplex stainless steels(Dsss)at 475℃was *** indicate that,for 2205 Dss,pitting corrosion behavior is influenced by the presence and size of g-phase precipitates for longer aging times,but this contribution is masked by the advanced stage of spinodal decomposition in the ferritic *** the other hand,for 2101 Dss,the formation of cr-richer nitrides impairs pitting corrosion resistance more than spinodal decomposition.

关键词： Duplex stainless steel spinodal decomposition g-phase precipitation Pitting corrosion Hardening

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DIREcTION AMBIgUITY REsOLUTION FROM sAR IMAgERY: A NEW APPROAcH

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Journal of Hydrodynamics 2001年第1期13卷 99-102页

作者： Yang, J.s. Huang, W.g. Zhou, c.B. state Oceanic Administration Hangzhou 310012 China

Ambiguity problem is inherent in synthetic aperture radar (sAR) images of ocean waves. A new method is developed based on the propagation theory of gravity waves to remove this kind of ambiguity from a single frame of... 详细信息

关键词： Oceanographic instruments Water waves

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Fibre Optic Protection system for concrete structures

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Journal of Materials science & Technology 2006年第3期22卷 404-410页

作者： J.s.Leng A.Hameed D.Winter R.A.Barnes g.c.Mays g.F.Fernando centre for composite Materials Harbin Institute of Technology Harbin 150001 China Engineering system Department Defence Academy of the United Kingdom Cranfield University Shrivenham Wiltshire SN6 8LA UK

The design concepts, modelling and implementation of various fibre optic sensor protection systems for development in concrete structures were investigated. Design concepts and on-site requirements for surface-mounted and embedded optical fibre sensor in concrete were addressed. Finite element （FE） modelling of selected sensor protection systems in strain-transfer efficiency from the structure to the sensing region was also studied. And experimental validation of specified sensor protection system was reported. Results obtained indicate that the protection system for the sensors performs adequately in concrete environment and there is very good correlation between results obtained by the protected fibre optic sensors and conventional electrical resistance strain gauges.

关键词： Fibre optic sensor (FOs) sensor protection system (sPs) concrete structures Extrinsic Fabry-Perot interferometer (EFPI) sensor smart structures strain transfer

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sIMULATION OF TEMPERATURE AND THERMAL sTREss FIELD IN LAsER MILLINg PROcEssINg

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Acta Metallurgica sinica(English Letters) 2004年第1期17卷 43-46页

作者： g.F.Yuan c.s.ge X.Y.Zeng state Key Laboratory of Laser Technology.Huazhong University of science and Technology Wuhan 430074China Anhui Institute of Architecture and IndustryHefei 230022 ChinaAnhui Institute of Architecture and IndustryHefei 230022 ChinaState Key Laboratory of Laser Technology Huazhong University of Science and Technology Wuhan 430074 China

The physical model of temperature field and thermal stress field are established in this paper, on which the numerical simulation with the assuming physical and laser milling parameters have been finished. The laser m... 详细信息

关键词： laser milling temperature field thermal stress field simulation

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REsEARcH ON THE FORMATION MEcHANIsM OF INTERNAL cRAcK IN THE cONTINUOUs cAsTINg sLAB

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Acta Metallurgica sinica(English Letters) 2007年第1期20卷 35-39页

作者： g.W. chang g.c. Jin s.Y. chen X.D. Yue Department of Materials ＆ chemical Engineering Liaoning Institute of Technology Jinzhou 121000 China

In view of the periodic bending deformation of solid-liquid interface in the solidification process for continuous casting slab, the variation of temperature gradient and dendritic spacing in the front edge of the solid-liquid interface, and the nucleation and propagation process of crack were studied. It is shown that the bending deformation of the interface results in the temperature field change in the front edge of solid-liquid interface, and the occurrence of temperature gradient along drawing direction results in the growth of secondary dendrites. The initial crack formed during the middle and final stage of solidification may extend to the surface of the casting slab and become an internal crack. The results of the theoretical analysis are basically in agreement with that of the experiment.

关键词： continuous casting dendritic spacing internal crack

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genetic interactions between polycystin-1 and Wwtr1 in osteoblasts define a novel mechanosensing mechanism regulating bone formation in mice

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Bone Research 2023年第4期11卷 772-783页

作者： Zhousheng Xiao Li cao Micholas Dean smith Hanxuan Li Wei Li Jeremy c.smith Leigh Darryl Quarles Department of Medicine University of Tennessee Health Science CenterMemphisTN 38163USA UT/ORNL center for Molecular Biophysics Oak Ridge National LaboratoryOak RidgeTN 37830USA Department of Biochemistry and cellular and Molecular Biology The University of Tennessee-KnoxvilleKnoxvilleTN 37996-1939USA Department of Pharmaceutical sciences University of Tennessee Health Science CenterMemphisTN 38163USA

Molecular mechanisms transducing physical forces in the bone microenvironment to regulate bone mass are poorly ***,we used mouse genetics,mechanical loading,and pharmacological approaches to test the possibility that polycystin-1 and Wwtr1 have interdependent mechanosensing functions in *** created and compared the skeletal phenotypes of control Pkd1^(flox/)+;Wwtr1^(flox/)+,Pkd1^(Oc-cKO),Wwtr1^(Oc-cKO),and Pkd1/Wwtr1^(Oc-cKO)mice to investigate genetic *** with an interaction between polycystins and Wwtr1 in bone in vivo,Pkd1/Wwtr1^(Oc-cKO)mice exhibited greater reductions of BMD and periosteal MAR than either Wwtr1Oc-cKOor Pkd1^(Oc-cKO)***-cT 3D image analysis indicated that the reduction in bone mass was due to greater loss in both trabecular bone volume and cortical bone thickness in Pkd1/Wwtr1Oc-cKO mice compared to either Pkd1Oc-cKOor Wwtr1^(Oc-cKO)***1/Wwtr1^(Oc-cKO)mice also displayed additive reductions in mechanosensing and osteogenic gene expression profiles in bone compared to Pkd1Oc-cKOor Wwtr1^(Oc-cKO)***,we found that Pkd1/Wwtr1^(Oc-cKO)mice exhibited impaired responses to tibia mechanical loading in vivo and attenuation of loadinduced mechanosensing gene expression compared to control ***,control mice treated with a small molecule mechanomimetic,Ms2 that activates the polycystin complex resulted in marked increases in femoral BMD and periosteal MAR compared to vehicle *** contrast,Pkd1/Wwtr1^(Oc-cKO)mice were resistant to the anabolic effects of *** findings suggest that Pc1 and Wwtr1 form an anabolic mechanotransduction signaling complex that mediates mechanical loading responses and serves as a potential novel therapeutic target for treating osteoporosis.

关键词： mec impaired additive

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Multiscale approach to micro/macro fatigue crack growth in 2024-T3 aluminum panel

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science china(Physics,Mechanics & Astronomy) 2014年第1期57卷 51-58页

作者： sIH g.c. International center for sustainability Accountability and Eco-Affordability of the Large and Small (ICSAELS) Lehigh UniversityBethlehem PA 18015 USA Key Laboratory of Pressure systems and safety Ministry of Education School of Mechanical Engineering East China University of Science and Technology

When two contacting solid surfaces are tightly closed and invisible to the naked eye, the discontinuity is said to be microscopic regardless of whether its length is short or long. By this definition, it is not sufficient to distinguish the difference between a micro- and macro-crack by using the length parameter. Microcracks in high strength metal alloys have been known to be sev- eral centimeters or longer. considered in this work is a dual scale fatigue crack growth model where the main crack can be mi- cro or macro but there prevails an inherent microscopic tip region that is damaged depending on the irregularities of the micro- structure. This region is referred to as the ＂micro-tip＂ and can be simulated by a sharp wedge with different angles in addition to mixed boundary conditions. The combination is sufficient to model microscopic entities in the form of voids, inclusions, precipitations, interfaces, in addition to subgrain imperfections, or cluster of dislocations. This is accomplished by using the method of ＂singularity representation＂ such that closed form asymptotic solutions can be obtained for the development of fa- tigue crack growth rate relations with three parameters. They include：（1） the crack surface tightness o-＊ represented by cro/cr~ = 0.3-0.5 for short cracks in region I, and 0.1-0.2 for long cracks in region II, （2） the micro/macro material properties reflected by the shear modulus ratio/1＂（=,L/micro/]-/macro varying between 2 and 5） and （3） the most sensitive parameter d＊ being the micro-tip characteristic length d＊（=d/do） whose magnitude decreases in the direction of region I ---~II. The existing fatigue crack growth data for 2024-T3 and 7075-T6 aluminum sheets are used to reinterpret the two-parameter da/dN=c（AK）n relation where AK has now been re-derived for a microcrack with surfaces tightly in contact. The contact force will depend on the mean stress ~m or mean stress ratio R as the primary parameter and on the stress amplitude era

关键词： microcrack macrocrack microstructure singularity multiscaling scale shift micro/macro crack growth 7075-T6 and 2024-T3

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From monoscale to multiscale modeling of fatigue crack growth:stress and energy density factor

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science china(Physics,Mechanics & Astronomy) 2014年第1期57卷 39-50页

作者： sIH g.c. International center for sustainability Accountability and Eco-Affordability of the Large and Small (ICSAELS) Lehigh University Bethlehem PA 18015 USA Key Laboratory of Pressure systems and safety Ministry of Education School of Mechanical Engineering East China University of Science and Technology

The formalism of the earlier fatigue crack growth models is retained to account for multiscaling of the fatigue process that involves the creation of macrocracks from the accumulation of micro *** effects of at least two scales,say micro to macro,must be accounted *** same data can thus be reinterpreted by the invariancy of the transitional stress intensity factors such that the microcracking and macrocracking data would lie on a straight *** threshold associated with the sigmoid curve *** segmentation is shown to be a necessity for addressing multiscale energy dissipative processes such as fatigue and *** independency and energy release rate are monoscale criteria that can lead to unphysical results,violating the first *** of monoscale failure or fracture criteria to nanomaterials is taking toll at the expense of manufacturing super strength and light materials and structural *** brief view is offered in the spirit of much needed additional research for the reinforcement of materials by creating nanoscale interfaces with sustainable time in *** step by step consideraton at the different scales may offer a better understanding of the test data and their limitations with reference to space and time.

关键词： multiscale fatigue monoscale dualscale stress intensity energy density macro micro nano spatial-temporal crack stability sustaibale time

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cOMPETINg REAcTIONs OF EXIsTINg Ni sILIcIDE AND Ni OR si INDUcED BY THERMAL ANNEALINg AND MeV si ION BEAM MIXINg

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Nuclear science and Techniques 1993年第3期4卷 158-163页

作者：朱德彰 M.c.Ridgway R.g.Elliman J.s.Williams g.collins shanghai Institute of Nuclcar Rescarch Academia Sinica Dept of Electronic Materials Engincering Research School of Physical Science and Engineering The Australian National University Canberra 2601 Australia Plasma and surface Technologies Advanced Materials Program Australian Nuclear Science and Technology Organisation Lucas Heights NSW 2234 Australia

The competing reactions between existing Ni silicides surrounded by si and Ni were investigated by thermal annealing and MeV si ion beam mixing. With high energy irradiation, the energy deposition at both interfaces, Ni/Ni silicide and Ni silicide/si, is equal. Two MeV He^- RBs and TEM were used to obtain the reacted layer composition and epitaxial orientation, respectively. Also glancing angle co K_a. X-ray diffraction was utilized to identify phase formation. The main results indicate that the existing silicides preferentially react with Ni layer, and that there are pronounced differences of Ni silicide phase transition between thermal annealing and MeV si ion beam mixing, even though the mixing was performed in radiation enhanced diffusion regime. The results can be explained in term of the heat of silicide formation and surface energy change.

关键词： chemical reaction kinetics Ni silicides MeV si ion beam mixing Annealing RBs TEM

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