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| 1 | The influence of Ca and Cu additions on the microstructure,mechanical and degradation properties of Zn-Ca-Cu alloys for absorbable wound closure device applications显示文摘Novel ternary Zn-Ca-Cu alloys were studied for the development of absorbable wound closure device material due to Ca and Cu’s therapeutic values to wound healing.The influence of Ca and Cu on the microstructure,mechanical and degradation properties of Zn were investigated in the as-cast state to establish the fundamental understanding on the Zn-Ca-Cu alloy system.The microstructure of Zn-0.5Ca-0.5Cu,Zn-1.0Ca-0.5Cu,and Zn0.5Ca-1.0Cu is composed of intermetallic phase CaZn13 distributed within the Zn-Cu solid solution.The presence of CaZn13 phase and Cu as solute within the Zn matrix,on the one hand,exhibited a synergistic effect on the grain refinement of Zn,reducing the grain size of pure Zn by 96%;on the other hand,improved the mechanical properties of the ternary alloys through solid solution strengthening,second phase strengthening,and grain refinement.The degradation properties of Zn-Ca-Cu alloys are primarily influenced by the micro-galvanic corrosion between Zn-Cu matrix and CaZn13 phase,where the 0.5%and 1.0%Ca addition increased the corrosion rate of Zn from 11.5μm/y to 19.8μm/y and 29.6μm/y during 4 weeks immersion test. | Nan Yang Nagasivamuni Balasubramani Jeffrey Venezuela Sharifah Almathami Cuie Wen Matthew Dargusch | 2021 | Bioactive Materials2021，6，5： | 2 |
| 2 | Calcium antagonists and antherosclerosis protection in hypertesion显示文摘 | Lisandro A Barquismeto Venezuela | 2003 | Am J Ther2003，10，6： | 1 |
| 3 | Why do parrots talk? Venezuelan site offers clues 显示文摘 | MASAGUARAL H CALABOZO VENEZUELA | 2011 | Science2011，333，： | 1 |
| 4 | Calcium antagonists and atherosclerosis protection in hypertesion 显示文摘 | Lisandro A Barquismeto Venezuela | 2003 | Am J Ther2003，10，6： | 1 |
| 5 | Electronic steps and band offset of Si-Ge two-dimensional superlattices on Bi/Si(111) 显示文摘 | Miwa R H Schmidt T M Venezuela P | 2005 | Phys Rev B2005，72，12： | 1 |
| 6 | Y-shaped carbon nanotubes: structural stability and transport properties 显示文摘 | LATGE A GRIMM D VENEZUELA P | 2005 | Journal of Molecular Catalysis: A2005，228，12： | 1 |
| 7 | Theory of double- resonant Raman spectra in graphene: Intensity and line shape of defect-induced and two-phonon bands 显示文摘 | Venezuela P Lazzeri M Mauri F | 2011 | Phys Rev B2011，84，03： | 1 |
| 8 | 查看详情显示文摘 | Mansoor Niaz Eatado Sucre Venezuela | | 0，，04： | 1 |
| 9 | Stress corrosion cracking of EV31A in 0.1 M Na_(2)SO_(4) saturated with Mg(OH)_(2)显示文摘This paper studied the stress corrosion cracking(SCC)of EV31A in 0.1 M Na 2 SO 4 saturated with Mg(OH)2 using linearly increasing stress tests,compared with pure Mg and WE43B.All three materials were susceptible to SCC.SCC susceptibility increased with decreasing applied stress rate.The threshold stress was 0.3×(yield stress)for pure Mg,0.6×(yield stress)for EV31A,and 0.8×(yield stress)for WE43B.The SCC velocities at an applied stress rate of 7.3×10^(-4)MPa s^(-1)were 7.2×10^(-8)m s^(−1)for pure Mg,5.6×10^(-9)m s^(-1)for WE43B,and 1.5×10^(-9)m s^(-1)for EV31A. | Yifeng Li Yushan Zhou Zhiming Shi Jeffrey Venezuela Akif Soltan Andrej Atrens | 2018 | Journal of Magnesium and Alloys2018，6，4： | 0 |
| 10 | In vivo performance of a rare earth free Mg-Zn-Ca alloy manufactured using twin roll casting for potential applications in the cranial and maxillofacial fixation devices显示文摘A magnesium alloy containing essential,non-toxic,biodegradable elements such as Ca and Zn has been fabricated using a novel twin-roll casting process(TRC).Microstructure,mechanical properties,in vivo corrosion and biocompatibility have been assessed and compared to the properties of the rare earth(RE)element containing WE43 alloy.TRC Mg-0.5 wt% Zn-0.5 wt% Ca exhibited fine grains with an average grain size ranging from 70 to 150μm.Mechanical properties of a TRC Mg-0.5Zn-0.5Ca alloy showed an ultimate tensile strength of 220 MPa and ductility of 9.3%.The TRC Mg-0.5Zn-0.5Ca alloy showed a degradation rate of 0.51±0.07 mm/y similar to that of the WE43 alloy(0.47±0.09 mm/y)in the rat model after 1 week of implantation.By week 4 the biodegradation rates of both alloys studied were lowered and stabilized with fewer gas pockets around the implant.The histological analysis shows that both WE43 and TRC Mg-0.5Zn-0.5Ca alloy triggered comparable tissue healing responses at respective times of implantation.The presence of more organized scarring tissue around the TRC Mg-0.5Zn-0.5Ca alloys suggests that the biodegradation of the RE-free alloy may be more conducive to the tissue proliferation and remodelling process. | Matthew S.Dargusch Nagasivamuni Balasubramani Nan Yang Sean Johnston Yahia Ali Gui Wang Jeffrey Venezuela Jiwon Carluccio Cora Lau Rachel Allavena Daniel Liang Karine Mardon Qingsong Ye | 2022 | Bioactive Materials2022，7，6： | 0 |
| 11 | A review of the origin of equiaxed grains during solidification under mechanical stirring,vibration,electromagnetic,electric-current,and ultrasonic treatments显示文摘Refinement of grains and intermetallic phases in the as-solidified alloy structure offers uniform struc-tural properties,eliminates or minimizes common solidification defects,including segregation and hot cracking,and improves thermomechanical processing of wrought alloys.Melt processing by an external field is an efficient process for achieving refinement of the solidification structure of Al and Mg alloys without altering the alloy composition.A wide range of melt processing methods and solidification stud-ies(conventional,directional,and in-situ approaches)have been reported in the literature that explore the mechanism of refinement.Identifying the dominant grain refinement mechanism has been a focus of most investigations because significant variations exist according to the casting conditions and the type of applied external treatments.The origin of fine grains occurs through either one or a combination of heterogenous nucleation,fragmentation of dendrites and grains formed and then separated from the surface of the melt and mould wall under vibration or agitation.The first part of this review describes the prominent external field techniques and the mechanisms proposed for the origin of fine grains.The second part critically compares the current understanding of these grain refinement mechanisms to de-termine differences and commonalities to identify the factors that promote the formation of equiaxed zones occupying a large volume fraction of the casting. | Nagasivamuni Balasubramani Jeffrey Venezuela David StJohn Gui Wang Matthew Dargusch | 2023 | Journal of Materials Science & Technology2023，，13： | 0 |
| 12 | Angle-tunable intersubband photoabsorption and enhanced photobleaching in twisted bilayer graphene显示文摘Van der Waals heterostructures obtained by artificially stacking two-dimensional crystals represent the frontier of material engineering,demonstrating properties superior to those of the starting materials.Fine control of the interlayer twist angle has opened new possibilities for tailoring the optoelectronic properties of these heterostructures.Twisted bilayer graphene with a strong interlayer coupling is a prototype of twisted heterostructure inheriting the intriguing electronic properties of graphene.Understanding the effects of the twist angle on its out-of-equilibrium optical properties is crucial for devising optoelectronic applications.With this aim,we here combine excitation-resolved hot photoluminescence with femtosecond transient absorption microscopy.The hot charge carrier distribution induced by photo-excitation results in peaked absorption bleaching and photo-induced absorption bands,both with pronounced twist angle dependence.Theoretical simulations of the electronic band structure and of the joint density of states enable to assign these bands to the blocking of interband transitions at the van Hove singularities and to photo-activated intersubband transitions.The tens of picoseconds relaxation dynamics of the observed bands is attributed to the angle-dependence of electron and phonon heat capacities of twisted bilayer graphene. | Eva A.A.Pogna Xianchong Miao Driele von Dreifus Thonimar V.Alencar Marcus V.O.Moutinho Pedro Venezuela Cristian Manzoni Minbiao Ji Giulio Cerullo Ana Maria de Paula | 2021 | Nano Research2021，14，8： | 0 |
| 13 | Expedient secondary functions of flexible piezoelectrics for biomedical energy harvesting显示文摘Flexible piezoelectrics realise the conversion between mechanical movements and electrical power by conformally attaching onto curvilinear surfaces,which are promising for energy harvesting of biomedical devices due to their sustainable body movements and/or deformations.Developing secondary functions of flexible piezoelectric energy harvesters is becoming increasingly significant in recent years via aiming at issues that cannot be addressed or mitigated by merely increasing piezoelectric efficiencies.These issues include loose interfacial contact and pucker generation by stretching,power shortage or instability induced by inadequate mechanical energy,and premature function degeneration or failure caused by fatigue fracture after cyclic deformations.Herein,the expedient secondary functions of flexible piezoelectrics to mitigate above issues are reviewed,including stretchability,hybrid energy harvesting,and self-healing.Efforts have been devoted to understanding the state-of-the-art strategies and their mechanisms of achieving secondary functions based on piezoelectric fundamentals.The link between structural characteristic and function performance is unravelled by providing insights into carefully selected progresses.The remaining challenges of developing secondary functions are proposed in the end with corresponding outlooks.The current work hopes to help and inspire future research in this promising field focusing on developing the secondary functions of flexible piezoelectric energy harvesters. | Yuan Wang Min Hong Jeffrey Venezuela Ting Liu Matthew Dargusch | 2023 | Bioactive Materials2023，，4： | 0 |
| 14 | Microstructure refinement in biodegradable Zn-Cu-Ca alloy for enhanced mechanical properties,degradation homogeneity,and strength retention in simulated physiological condition显示文摘Zn-1.0Cu-0.5Ca(TA15)alloy has shown promising characteristics of enhanced mechanical properties and biodegradability for absorbable cardiovascular stents,endovascular devices,and wound closure devices applications.In this study,the TA15 alloy for bioabsorbable biomedical applications is investigated.In the conventionally cast TA15(TA15-C)alloy,CaZn_(13) phase are present as a large dendritic network with an average size of 73.25±112.84μm,Hot rolling of the TA15-C alloy has broken the long and dendritic network of the CaZn_(13) phases,however,the refined phases are observed as segregations and the distribution is non-uniform.These segregated CaZn_(13) suffered heavy localised corrosion which lead to poor mechanical properties in the as-fabricated condition and after biodegradation.Ultrasonic treatment(UST)during casting is identified as an effective technique for the refinement and redistribution of CaZn_(13) particles in TA15 alloy,which successfully reduce the size of the CaZn_(13) phase to 10.91±4.65μm in the as-solidified condition.After hot rolling,the UST processed TA15(TA15-UST)shows improved mechanical properties due to grain refinement and the reduction in microstructural defects,i.e.the broken CaZn_(13) phase.Results of 8-week immersion corrosion tests showed that both alloys possess very similar corrosion rate.However,TA15-UST has markedly improved corrosion homogeneity compared to TA15-N which favours the retention of mechanical properties even after prolonged exposure to physiological fluids. | Nan Yang Nagasivamuni Balasubramani Jeffrey Venezuela Helle Bielefeldt-Ohmann Rachel Allavena Sharifah Almathami Matthew Dargusch | 2022 | Journal of Materials Science & Technology2022，，30： | 0 |
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