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Fabricating CoCrFemnNi high entropy alloy via selective laser melting in-situ alloying

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Journal of materials Science & Technology 2020年第8期36卷 40-43页

作者： Peng Chen Sheng Li Yinghao Zhou ming Yan moataz m.attallah Advanced materials Processing Laboratory University of BirminghamBirmingham B152TTUK Department of materials Science and Engineering and Shenzhen Key Laboratory for Additive Manufacturing of High Performance MaterialsSouthern University of Science and TechnologyShenzhen 518055China

Quasi-equiatomic Co Cr Fe mn Ni high entropy alloy(HEA)has been in-situ alloyed by selective laser melting(SLm)from a blend of Co Cr Fe Ni pre-alloyed powder and mn elemental *** blended powder shows good printability with various SLm parameters and the as-built HEA samples achieve a reliable forming *** the slight evaporation of mn,energy dispersive spectrometer mapping and Xray diffraction results show that the as-built HEA has a homogeneous chemical distribution and presents a single face-centred-cubic(fcc)phase,indicating successful in-situ *** study has verified the feasibility of using blended powder to prepare high-quality HEA by SLm.

关键词： High entropy alloys Laser processing Selective laser melting In-situ alloying CoCrFemnNi Crystal structure

The development of a high-performance Ni-superalloy additively manufactured heat pipe

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Advances in manufacturing 2022年第4期10卷 610-624页

作者： Sheng Li Khamis Essa James Carr States Chiwanga Andrew Norton moataz m.attallah School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006People’s Republic of China School of Engineering University of BirminghamEdgbastonBirmingham B152TTUK Henry moseley X-ray Imaging Facility Henry Royce Institute for Advanced MaterialsDepartment of MaterialsUniversity of ManchesterManchester M139PLUK European Thermodynamics Ltd 8 Priory Business ParkWistow RoadKibworthLeicestershire LE80RXUK Rolls-Royce plc P.O.Box 31Derby DE248BJUK School of metallurgy and materials University of BirminghamEdgbastonBirmingham B152TTUK

Additively manufacturing(Am)has been used to manufacture fine structures with structured/engineered porosity in heat management *** this study,laser powder bed fusion(LPBF)was used to manufacture a high-performance Ni-superalloy heat pipe,through tailoring LPBF process parameters to fabricate thin wall and *** using novel laser scanning strategies,wick structure heat pipes with maximised surface-area-to-volume ratio,fine features size around 100µm,and controlled porosity were successfully *** and X-ray microtomography(micro-CT)were used to investigate the 3D structure of the void space within the *** test results showed that most of the heat pipes made by LPBF had better performance than the conventionally manufactured *** study also investigated the influences of the process parameters on the porosity volume fraction and the feature *** results showed that LPBF process could fabricate thin structure due to the change of melt pool contact *** relationship between process parameters and bead size reported in this study could help design and manufacture heat pipe with complex fine structure.

关键词： Laser powder bed fusion(LPBF) Heat pipe melt pool microtomography(micro-CT)

Synchrotron Characterisation of Ultra-Fine Grain TiB_(2)/Al-Cu Composite Fabricated by Laser Powder Bed Fusion

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Acta metallurgica Sinica(English Letters) 2022年第1期35卷 78-92页

作者： Sheng Li Biao Cai Ranxi Duan Lei Tang Zihan Song Dominic White Oxana V.magdysyuk moataz m.attallah School of metallurgy and materials University of BirminghamEdgbastonBirminghamB152TTUK Department of materials Science and Engineering Southern University of Science and TechnologyShenzhen518055China ZEISS House Building 1030Cambourne Business ParkCambourneCambridgeCB236DWUK Diamond Light Source Ltd Harwell Science and Innovation CampusDidcotOX110DEOxfordshireUK

Isotropy in microstructure and mechanical properties remains a challenge for laser powder bed fusion(LPBF)processed materials due to the epitaxial growth and rapid cooling in *** this study,a high-strength TiB_(2)/Al-Cu composite with random texture was successfully fabricated by laser powder bed fusion(LPBF)using pre-doped TiB_(2)/Al-Cu composite powder.A series of advanced characterisation techniques,including synchrotron X-ray tomography,correlative focussed ion beam-scanning electron microscopy(FIB-SEm),scanning transmission electron microscopy(STEm),and synchrotron in situ X-ray diffraction,were applied to investigate the defects and microstructure of the as-fabricated TiB_(2)/Al-Cu composite across multiple length *** study showed ultra-fine grains with an average grain size of about 0.86μm,and a random texture was formed in the as-fabricated condition due to rapid solidification and the TiB_(2)particles promoting heterogeneous *** yield strength and total elongation of the as-fabricated composite were 317 mPa and 10%,*** contributions of fine grains,solid solutions,dislocations,particles,and Guinier-Preston(GP)zones were *** was found to be initiated from the largest lack-of-fusion pore,as revealed by in situ synchrotron tomography during tensile *** situ synchrotron diffraction was used to characterise the lattice strain evolution during tensile loading,providing important data for the development of crystal-plasticity models.

关键词： Aluminium metal matrix composite Laser powder bed fusion Heterogeneous nucleation Synchrotron characterisation

mechanical property and biological behaviour of additive manufactured TiNi functionally graded lattice structure

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International Journal of Extreme manufacturing 2022年第4期4卷 207-213页

作者： Chaolin Tan Cheng Deng Sheng Li Alessandro Abena Parastoo Jamshidi Khamis Essa Likang Wu Guohua Xu moataz m.attallah Jia Liu School of metallurgy&materials University of BirminghamBirmingham B152TTUnited Kingdom Department of Orthopedic Surgery Second Affiliated Hospital of Naval Medical UniversityShanghai 200003People's Republic of China School of Engineering University of BirminghamBirmingham B152TTUnited Kingdom School of mechanical&Automotive Engineering South China University of TechnologyGuangzhou 510640People's Republic of China

Bio-inspired porous metallic scaffolds have tremendous potential to be used as artificial bone *** this work,a radially graded lattice structure (RGLS),which mimics the structures of natural human bones,was designed and processed by laser powder bed fusion of martensitic Ti-rich TiNi *** asymmetric tension-compression behaviour,where the compressive strength is significantly higher than the tensile strength,is observed in this Ti-rich TiNi material,which echoes the mechanical behaviour of *** morphologies,mechanical properties,deformation behaviour,and biological compatibility of RGLS samples were characterised and compared with those in the uniform lattice *** the uniform and RGLS samples achieve a relative density higher than 99%.The graded porosities and pore sizes in the RGLS range from 40%-80% and 330-805 µm,respectively,from the centre to the *** chemical etching has significantly removed the harmful partially-melted residual powder particles on the lattice *** compressive yield strength of RGLS is 71.5 mPa,much higher than that of the uniform sample (46.5 mPa),despite having a similar relative density of about 46%.The calculated Gibson-Ashby equation and the deformation behaviour simulation by finite element suggest that the dense outer regions with high load-bearing capability could sustain high applied stress,improving the overall strength of RGLS *** cell proliferation study suggests better biological compatibility of the RGLS than the uniform *** findings highlight a novel strategy to improve the performance of additively manufactured artificial implants by bio-inspiration.

关键词： additive manufacturing bio-inspired graded lattice mechanical properties biological compatibility

Visual and refractive outcomes of posterior chamber phakic IOL in stable keratoconus

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International Journal of Ophthalmology(English edition) 2019年第5期12卷 840-843页

作者： Sherif H Emerah moataz m Sabry Hisham A Saad Waleed A Ghobashy Ophthalmology Department Research Institute of Ophthalmology magrabi Eye Hospital Ophthalmology Department Tanta University Ophthalmology Department Suez Canal University

We evaluated the visual and refractive outcomes after phakic visian toric implantable collamer lens(ICL) insertion in stable keratoconus(KC). This retrospective study investigated toric ICL implantation in 14 eyes of 8 patients with stable KC. After 6 mo, the mean uncorrected distance visual acuity improved significantly from 0.77 to 0.15 logmAR. The mean best corrected distance visual acuity(BCDVA) improved from 0.18±0.1 to 0.15±0.1 logmAR. Fifty percent of eyes maintained their preoperative BCDVA; 42.8% gained one line. There was no statistical difference in high order or coma aberration. The mean refractive manifest spherical equivalent(mSE), mean refractive manifest spherical error, mean manifest astigmatism decreased significantly postoperatively. At 6 mo postoperatively, our achieved mean spherical equivalent was approximately 74%. No intraoperative or postoperative complications occurred. Toric ICL implantation was effective, predictable and safe to correct refractive error and improve visual acuity in patients with stable KC.

关键词： coma keratoconus lens implantation intraocular

Tailoring nanocomposite membranes of cellulose acetate/silica nanoparticles for desalination

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Journal of materiomics 2022年第6期8卷 1122-1130页

作者： Amira S.mohammed Ali moataz m.Soliman Sherif H.Kandil Shaker Ebrahim marwa Khalil materials Science Department Institute of Graduate Studies and Research(IGSR)Alexandria University163 Horrya AvenueEl-ShatbyP.O.Box 83221526AlexandriaEgypt Nanotechnology and Composite materials Department Advanced Technology and New Materials Research InstituteCity of Scientific Research and Technological Applications(SRTA-City)P.O.Box 21934New Borg El Arab CityAlexandriaEgypt

Herein, the fabrication of cellulose acetate (CA) silica-based nanocomposite membranes via the dry-wetphase inversion procedure for water desalination was investigated. The modified and unmodified silicananoparticles (mSNPs and SNPs) were prepared by the sol-gel technique. The effect of the SNPs andmSNPs was investigated on the CA membrane's properties and their performance for water *** CA nanocomposite membranes were characterized to study their structure, hydrophilicity, andmorphology. The fabricated nanocomposite membranes showed hydrophilic surface properties. Theperformance of reverse osmosis (RO) membranes was measured using a crossflow RO unit at 10 bar(1 bar = 0.1 mPa). The membrane with 10 mg of SNPs enhanced permeate water flux compared to thepristine CA membrane by 1.6 L/(m2·h). The effect of mSNPs on the nanocomposites' performance waslower than their counterpart in the case of adding SNPs. The membrane with 30 mg of mSNPs showedthe highest permeate water flux among other nanocomposite membranes with a value oAQSf 35.7 L/(m2·h)at 24 bar.

关键词： Silica nanoparticles Amino-modified silica Cellulose acetate Nanocomposite membrane Water desalination Reverse osmosis

Solution-processed quantum dot SnO_(2) as an interfacial electron transporter for stable fully-air-fabricated metal-free perovskite solar cells

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Journal of materiomics 2022年第6期8卷 1172-1183页

作者： Rabie m.Youssef A.m.S.Salem Ahmed Shawky Shaker Ebrahim moataz Soliman mohamed S.A.Abdel-mottaleb Said m.El-Sheikh Nanostructured materials and Nanotechnology Department Advanced Materials InstituteCentral Metallurgical Research and Development Institute(CMRDI)P.O.Box:87HelwanCairo11421Egypt Nano-Photochemistry and Solar Chemistry Labs. Department of ChemistryFaculty of ScienceAin Shams UniversityAbbassiaCairoEgypt Department of materials Science Institute of Graduate Studies and ResearchAlexandria UniversityEgypt

Perovskite solar cells could strongly compete with the silicon solar cells in the market soon as illustrated in recent *** this work,promising and stable metal-free perovskite solar cells(PSCs)has been successfully fabricated using an inorganic SnO_(2)/Quantum dot SnO_(2)(QD-SnO_(2))double layer as an efficient electron transport layer via a low-temperature solution *** fully-air fabricated PSCs in the form of FTO/SnO_(2)/QD-SnO_(2)/CH3NH3PbI3/Carbon were tested at different annealed QD-SnO_(2) between 300 and 500℃.The as-prepared QD-SnO_(2) and the fabricated devices are characterized by various techniques,including XRD,XPS,HR-TEm,FE-SEm,UVeviseNIR spectroscopy,PL,and solar *** prepared QD-SnO_(2) at 300℃ has shown well-ordered nanoparticles of 5.6 nm in diameter with superior carrier density(1.5×10^(15) cm^(-3))and highest carrier mobility(64.1 cm^(2)·V^(-1)·s^(-1)),accelerating the carriers separation process within the *** best devices demonstrated a maximum power conversion effi-ciency(PCE)of 11.7%,VOC 0.81 V,JSC 19.5 mA·cm^(-2),and FF 74%.The presence of an interfacial layer of QDSnO_(2) over the blocking SnO_(2) upsurges the band gaps alignment and accelerates the carriers extraction rate affecting the performance of the fabricated perovskite ***,the optimized fabricated devices revealed a shelf stability-life of four months in humid air(40%-50%)with>83%of its initial *** simple synthetic approach can develop the opportunities to transfer the cell from the lab to the market,which will be compatible with large-scale production.

关键词： Solution-processed nanomaterials Perovskite solar cells Electron transport layer Thin film Quantum Dot-SnO_(2)

氢氧化铝纳米片:结构依赖性癌症化疗药物的储运（英文）

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无机材料学报 2020年第2期35卷 250-256页

作者： LI Xia SHENASHEN mohamed A mEKAWY moataz TANIGUCHI Akiyoshi EI-SAFTY Sherif A Research Center for Functional materials National Institute for Materials ScienceIbaraki 305-0047Japan Cellular Functional Nanomaterials Group Research Center for Functional MaterialsNational Institute for Materials ScienceIbaraki 305-0044Japan Engineering and Advanced manufacturing University of SunderlandSunderlandUnited Kingdom

Alum has an excellent safety record and is the only licensed inorganic adjuvant for human ***,the exploration of alum nanosheets as chemotherapy drug delivery system,especially the clarification about the relationship between structures and drug loading properties,is totally ***,aluminum hydroxides(AlOOH)nanosheets with tunable specific surface area and pore size were synthesized by adjusting the synthesis time in the presence of triblock *** obtained materials exhibited the highest surface area about 470 m2/*** structure-dependent chemotherapy drug loading capability for AlOOH nanosheets was observed:the higher specific surface area and pore size are,the higher amount of chemotherapy drug is *** nanosheets loaded with doxorubicin showed a pH-dependent sustained release behavior with quick release in low pH about 5 and slow release in pH around ***-loaded AlOOH nanosheets exhibited much higher cancer cellular uptake efficiency than that in free form by flow ***,doxorubicin-loaded AlOOH nanosheets with high specific surface area showed an increased cellular uptake efficiency and enhanced ratios of apoptosis and necrosis,compared with those showing low specific surface ***,AlOOH nanosheets are promising materials as chemotherapy drug delivery system.

关键词： aluminum hydroxide nanosheet cancer chemotherapy storage drug delivery

Does vitamin C have the ability to augment the therapeutic effect of bone marrow-derived mesenchymal stem cells on spinal cord injury？

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Neural Regeneration Research 2017年第12期12卷 2050-2058页

作者： Nesrine Salem mohamed Y.Salem mohammed m.Elmaghrabi moataz A.Elawady mona A.Elawady Dina Sabry Ashraf Shamaa Abdel-Haleem H.Elkasapy Noha Ibrhim Azza Elamir Department of Histology and Cell Biology Faculty of Medicine Banha University Banha Egypt Department of Neurosurgery Faculty of Medicine Banha University Banha Egypt Department of Community medicine Faculty of Medicine Banha University Banha Egypt Department of medical Biochemistry Faculty of Medicine Cairo University Giza Egypt Department of Surgery and Radiology Faculty of Veterinary Medicine Cairo University Giza Egypt Department of Surgery Faculty of Veterinary Medicine Banha University Banha Egypt Department of medical Physiology Faculty of Medicine Banha University Banha Egypt Department of medical Biochemistry Faculty of Medicine El Fayoum University Egyptian Egypt

methylprednisolone（mP） is currently the only drug confirmed to exhibit a neuroprotective effect on acute spinal cord injury（SCI）. Vitamin C（VC） is a natural water-soluble antioxidant that exerts neuroprotective effects through eliminating free radical damage to nerve cells. Bone marrow mesenchymal stem cells（BmmSCs）, as multipotent stem cells, are promising candidates in SCI repair. To evaluate the therapeutic effects of mP, VC and BmmSCs on traumatic SCI, 80 adult male rats were randomly divided into seven groups： control, SCI（SCI induction by weight-drop method）, mP（SCI induction, followed by administration of 30 mg/kg mP via the tail vein, once every other 6 hours, for five times）, VC（SCI induction, followed by intraperitoneal administration of 100 mg/kg VC once a day, for 28 days）, mP ＋ VC（SCI induction, followed by administration of mP and VC as the former）, BmmSCs（SCI induction, followed by injection of 3 × 10~6 BmmSCs at the injury site）, and BmmSCs ＋ VC（SCI induction, followed by BmmSCs injection and VC administration as the former）. Locomotor recovery was assessed using the Basso mouse Scale. Injured spinal cord tissue was evaluated using hematoxylin-eosin staining and immunohistochemical staining. Expression of transforming growth factor-beta, tumor necrosis factor-alpha, and matrix metalloproteinase-2 genes was determined using real-time quantitative PCR. BmmSCs intervention better promoted recovery of nerve function of rats with SCI, mitigated nerve cell damage, and decreased expression of transforming growth factor-beta, tumor necrosis factor-alpha, and matrix metalloproteinase-2 genes than mP and/or VC. more importantly, BmmSCs in combination with VC induced more obvious improvements. These results suggest that VC can enhance the neuroprotective effects of BmmSCs against SCI.

关键词： nerve regeneration spinal cord injury vitamin C methylprednisolone bone marrow mesenchymalstern cells locotmotor neural regeneration