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Long-term deterioration of lubricant-infused nanoporous anodic aluminium oxide surface immersed in Nacl solution

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Journal of materials Science & Technology 2021年第5期64卷 57-65页

作者： Dequan Wu Lingwei ma Bei Liu Dawei Zhang Badar minhas Hongchang Qian Herman A.Terryn johannes m.c.mol Beijing Advanced Innovation centre for materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Department of materials and chemistry Research Group Electrochemical and Surface EngineeringVrije Universiteit BrusselBrusselsBelgium Department of materials Science and Engineering Delft University of TechnologyDelftthe Netherlands

This study investigated the deterioration of a lubricant-infused anodic aluminium oxide surface in a 1m Nacl solution for~200 *** observation by cryo-SEm and quantitative analyses by UV spectroscopy and EIS revealed that the long-term deterioration of the lubricant-infused surface was divided into two stages:the surface-adhered lubricant layer gradually dissolved at a constant rate until the substrate was exposed;afterwards the lubricant infused in the nanochannels began to diffuse and was depleted after~200 *** EIS results also revealed that the defects reduced the corrosion resistance of the lubricant-infused surface considerably.

关键词： Lubricant-infused surface Anodic aluminium oxide Deterioration EIS

corrosion and passive film.c.aracteristics of 3D-printed NiTi shape memory alloys in artificial saliva

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Rare metals 2023年第9期42卷 3114-3129页

作者： ming Liu Jia-Ning Zhu V.A.Popovich E.Borisov J.m.c.mol Y.Gonzalez-Garcia State Key Laboratory for m.c.anical Behavior of materials Center for Advancing Materials Performance from the Nanoscale(CAMP-Nano)Xi’an Jiaotong UniversityXi’an710049China Department of materials Science and Engineering Delft University of TechnologyAA Delft2600The Netherlands Peter the Great Saint-Petersburg Polytechnic University Saint Petersburg195251Russia

Electrochem.c.l tests and surface analysis were applied to study the corrosion behavior and passive film.c.aracteristics of three-dimensional-printed NiTi shape memory alloys fabricated by laser-powder bed fusion(LPBF) in artificial saliva at 37.c. The passivity of L-PBF NiTi shows to be influenced by the process parameters and resulting morphological and physicochem.c.l surface properties. The results show that the defects at the surface of L-PBF Ni Ti can promote the passivation rate in the early stages of exposure but a slowly formed passive film shows the best corrosion protection. The thickness of the passive film is positively correlated with its corrosion protective performance. The L-PBF NiTi alloy prepared at a linear energy density of 0.2 J·m^(-1) and volumetric energy density of 56 J·mm^(-3) shows the least defects and best corrosion protection. An outer Ti-rich and inner Ni-rich dense passive film.c.uld be also obtained showing higher corrosion resistance.

关键词： NiTi Laser-powder bed fusion(L-PBF) Passive film corrosion resistance Artificial saliva

Influence of HEPES buffer on the local pH and formation of surface layer during in vitro degradation tests of magnesium in DmEm

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Progress in Natural Science:materials International 2014年第5期24卷 531-538页

作者： S.Naddaf Dezfuli Zhigang Huan J.m.c.mol m.A.Leeflang Jiang chang Jie Zhou Department of Biom.c.anical Engineering Delft University of Technology Biomaterials and Tissue Engineering Research center Shanghai Institute of Ceramics Chinese Academy of Sciences Department of materials Science and Engineering Delft University of Technology

The human body is a buffered environment where p H is effectively maintained. HEPES is a biological buffer often used to mim.c.the buffering activity of the body in in vitro studies on the degradation behavior of magnesium. However, the influence of HEPES on the degradation behavior of magnesium in the DmEm pseudo-physiological solution has not yet been determined. The research aimed at elucidating the degradation m.c.anisms of magnesium in DmEm with and without HEPES. The morphologies and compositions of surface layers formed during in vitro degradation tests for 15–3600 s were characterized. The effect of HEPES on the electrochem.c.l behavior and corrosion tendency was determined by performing electrochem.c.l tests. HEPES indeed retained the local p H, leading to intense intergranular/interparticle corrosion of magnesium made from powder and an increased degradation rate. This was attributed to an interconnected network of cracks formed at the original powder particle boundaries and grain boundaries in the surface layer, which provided pathways for the corrosive medium to interact continuously with the internal surfaces and promoted further dissolution. Surface analysis revealed significantly reduced amounts of precipitated calcium phosphates due to the buffering activity of HEPES so that magnesium became less well protected in the buffered environment.

关键词： magnesium Intergranular corrosion HEPES DmEm Local pH

chronic peripheral inflammation: a possible contributor to neurodegenerative diseases

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Neural Regeneration Research 2021年第9期16卷 1711-1714页

作者： Patrick Süβ Addison J.Lana johannes c.m.Schlachetzki Department of molecular Neurology Friedrich-Alexander-University Erlangen-NürnbergUniversity Hospital ErlangenErlangenGermany Department of cellular and molecular medicine University of California San DiegoLa JollaCAUSA

The contribution of chronic peripheral inflammation to the pathogenesis of neurodegenerative diseases is an outstanding question. Sustained activation of the peripheral innate and adaptive immune systems occurs in the context of a broad array of disorders ranging from.c.ronic infectious diseases to autoimmune and metabolic diseases. In addition, progressive system.c.inflammation is increasingly recognized during aging. Peripheral immune cells could potentially modulate the cellular brain environment via the secretion of soluble molecules. There is an ongoing debate whether peripheral immune cells have the potential to migrate into the brain under certain permissive circumstances. In this perspective, we discuss the possible contribution of chronic peripheral inflammation to the pathogenesis of age-related neurodegenerative diseases with a focus on m.c.oglia, the resident immune cells of the brain parenchyma.

关键词： aging Alzheimer's disease inflammation innate immune system m.c.oglia neurodegeneration Parkinson's disease

Extrusion-based additive manufacturing of mg-Zn alloy scaffolds

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Journal of magnesium and Alloys 2022年第9期10卷 2491-2509页

作者： J.Dong N.Tümer m.A.Leeflang P.Taheri L.E.Fratila-Apachitei J.m.c.mol A.A.Zadpoor J.Zhou Department of Biom.c.anical Engineering Delft University of TechnologyDelft 2628 CDthe Netherlands Department of materials Science and Engineering Delft University of TechnologyDelft 2628 CDthe Netherlands

Porous biodegradable mg and its alloys are considered to have a great potential to serve as ideal bone *** recent progress in additive manufacturing(Am) has prompted its application to fabricate mg scaffolds with geometrically ordered porous *** Am,followed by debinding and sintering,has been recently demonstrated as a powerful approach to fabricating such mg scaffolds,which can avoid some crucial problems encountered when applying powder bed fusion Am ***,such pure mg scaffolds exhibit a too high rate of in vitro *** the present research,alloying through a pre-alloyed mg-Zn powder was ultilized to enhance the corrosion resistance and m.c.anical properties of Am geometrically ordered mg-Zn scaffolds *** in vitro biodegradation behavior,m.c.anical properties,and electrochem.c.l response of the fabricated mg-Zn scaffolds were ***,the response of preosteoblasts to these scaffolds was systematically evaluated and compared with their response to pure mg *** mg-Zn scaffolds with a porosity of 50.3% and strut density of 93.1% were composed of the mg matrix and mgZn2second phase *** in vitro biodegradation rate of the mg-Zn scaffolds decreased by 81% at day 1,as compared to pure mg *** 28 days of static immersion in modified simulated body fluid,the corrosion rate of the mg-Zn scaffolds decreased from 2.3± 0.9 mm/y to 0.7±0.1 mm/*** yield strength and Young’s modulus of the mg-Zn scaffolds were about 3 times as high as those of pure mg scaffolds and remained within the range of those of trabecular bone throughout the biodegradation *** culture of mc3T3-E1 preosteoblasts in mg-Zn extracts indicated favorable *** direct cell culture,some cells could spread and form filopodia on the surface of the mg-Zn ***,this study demonstrates the great potential of the extrusion-based Am mg-Zn scaffolds to be further develo

关键词： Additive manufacturing material extrusion magnesium-zinc alloy Porous scaffold Biodegradation

Genom.c.mosaicism of the Brain:Origin,Impact,and Utility

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Neuroscience Bulletin 2024年第6期40卷 759-776页

作者： Jared H.Graham johannes c.m.Schlachetzki Xiaoxu Yang martin W.Breuss Department of Pediatrics Section of Clinical Genetics and MetabolismUniversity of Colorado School of MedicineAurora80045-2581COUSA Department of cellular and molecular medicine University of California San DiegoLa Jolla92093-0021San DiegoCAUSA Department of Neurosciences University of California San DiegoLa Jolla92093-0021San DiegoCAUSA Rady children’s Institute for Genom.c.medicine San Diego92123CAUSA

Genom.c.mosaicism describes the phenomenon where some but not all cells within a tissue harbor unique genetic ***,research focused on the impact of genom.c.mosaicism on clinical phenotype—motivated by its involvement in cancers and overgrowth *** recently,we increasingly shifted towards the plethora of neutral mosaic variants that can act as recorders of cellular lineage and environmental ***,we summarize the current state of the field of genom.c.mosaicism research with a special emphasis on our current understanding of this phenomenon in brain development and *** the field of genom.c.mosaicism has a rich history,technological advances in the last decade have changed our approaches and greatly improved our *** will provide current definitions and an overview of contemporary detection approaches for genom.c.***,we will discuss the impact and utility of genom.c.mosaicism.

关键词： Genom.c. Brain development Brain homeostasis Genom.c.mosaicism

Tripolye mega-Sites:“collective computational Abilities”of Prehistoric Proto-Urban Societies?

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Journal of Social computing 2022年第1期3卷 75-90页

作者： johannes müller Robert Hofmann mila Shatilo the Institute of Prehistoric and Protohistoric Archaeology Kiel UniversityKiel 24106Germany

In the East European region between Prut and Dnieper,proto-urban mega-sites developed ca.4100−3600 BcE with population agglomerations of around 10000 inhabitants per *** outline of complexity categories,based on *** et al.(2018),illustrates that“computational abilities”are first developed to make the shift from dispersed to agglomerated settlement *** development of an internal decision-making system for a polity that organizes communication via public buildings on different levels,together with a site-specific track system,may be responsible for this shift(or made it possible).However,after generations,this communication pattern was not developed into further collective communication abilities(e.g.,into a writing system),while at the same time a tendency toward centralizing decision processes probably destroyed the communication *** ultimately led to the collapse of Tripolye mega-sites.

关键词： non-state societies social constitution chalcolithic mega-sites Tripolye

Exploring water and ion transport process at silicone/copper interfaces using in-situ electrochem.c.l and Kelvin probe approaches

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Journal of materials Science & Technology 2021年第5期64卷 203-213页

作者： B.munirathinam J.P.B.van Dam A.Herrmann W.D.van Driel F.De Buyl S.J.F.Erich L.G.J.van der Ven O.c.G.Adan J.m.c.mol Delft University of Technology Department of Materials Science and Engineering DepartmentDelftThe Netherlands Eindhoven University of Technology Department of Applied PhysicsEindhovenThe Netherlands Signify High Tech CampusEindhovenThe Netherlands Delft University of Technology Electronic ComponentsTechnology and MaterialsFaculty of Electrical EngineeringDelftThe Netherlands Dow Silicones Belgium s.p.r.l. Belgium

In general,packaging materials which encapsulate light emitting diodes(LEDs)and m.c.oelectronic devices offer barrier protection against several environmental hazards such as water and ionic ***,these encapsulants may provide pathways for water and ionic contaminants to reach the metal/polymer interfaces and provoke local corrosion of electronics,which is a major reliability concern for polymer encapsulated LEDs and *** the water and corrosive constituents play a crucial role in their reliability,water uptake kinetics,interfacial ion transport and delamination behaviour of silicone coated copper model system,mim.c.ing a typical m.c.oelectronics packaging system,is explored in the present *** impedance spectroscopy(EIS)integrated with attenuated total reflection Fourier transform infrared(ATR-FTIR)spectroscopy studies revealed that water diffusion inside the silicone network is Fickian in nature and the evolution of the observed time constants are related to the diffusion and interfacial reactions.A decrease of impedance magnitude with time was observed in EIS measurements concurrently with water absorption bands shifting towards lower wavenumber in ATR-FTIR measurements,implying the growth of strong hydrogen bonding between water molecules and the silicone *** estimated diffusion constant of water using the capacitance method was in the order of 7×10^(-12)m^(2)s^(-1)and the water absorption volume fraction was in the range of 0%to 0.30%.Scanning Kelvin probe studies elucidated the ion transport process occurring at the silicone/copper interface in a humid *** interfacial ion transport process is controlled by the interfacial electrochem.c.l reactions at the cathodic delamination front and the estimated average delamination rate is 0.43 mm h^(-1/2).This work demonstrates that exploring ion and water transport in the silicone coating and along the silicone/copper interface is of pivotal importance as

关键词： Silicone Impedance Water transport Scanning Kelvin probe Delamination

Efficient training of ANN potentials by including atom.c.forces via Taylor expansion and application to water and a transition-metal oxide

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npj computational materials 2020年第1期6卷 1205-1218页

作者： April m.c.oper johannes Kästner Alexander Urban Nongnuch Artrith School of chemistry University of St AndrewsSt AndrewsUK Institute for Theoretical chemistry University of StuttgartStuttgartGermany Department of chem.c.l Engineering Columbia UniversityNew YorkNYUSA

Artificial neural network(ANN)potentials enable the efficient large-scale atomistic modeling of complex materials with near firstprinciples *** molecular dynam.c. simulations,accurate energies and interatom.c.forces are a prerequisite,but training ANN potentials simultaneously on energies and forces from electronic structure calculations is computationally ***,we introduce an efficient alternative method for the training of ANN potentials on energy and force information,based on an extrapolation of the total energy via a Taylor *** translating the force information to approximate energies,the quadratic scaling with the number of atoms exhibited by conventional force-training methods can be avoided,which enables the training on reference datasets containing complex atom.c.structures.

关键词： forces enable atomic