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Open-cell mullite ceramic foams derived from porous geopolymer precursors with tailored porosity

Journal of Advanced Ceramics 2023年第2期12卷 279-295页

作者： Jiahuan SHAO Chengying BAI Xinyu LI Kun YANG Ting ZHENG Yingjie QIAO Lili ZHANG Hongqiang LI paolo colombo Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China College of Civil Engineering Hunan UniversityChangsha 410082China Department of Industrial Engineering University of Padovavia MarzoloPadova 35131Italy Department of Materials Science and Engineering The Pennsylvania State UniversityState College 16802USA

Porous geopolymer precursors were firstly prepared by the direct foaming method using bauxite,fly ash(FA),and metakaolin(MK)as raw materials,and porous mullite ceramics were prepared after ammonium ion exchange and then high-temperature *** effects of chemical foaming agent concentration,ion-exchange time,and sintering temperature on porous geopolymerderived mullite ceramics were studied,and the optimal preparation parameters were *** have shown that the concentration of blowing agent had great influence on open porosity(q)and porosity and cell size distributions of geopolymer samples,which in turn affected their compressive strength(σ).Duration of the ion exchange had no obvious effect on the sintered samples,and the amount of mullite phase increased with the increase in the sintering *** foams,possessing an open-celled porous structure,closely resembling that of the starting porous geopolymers produced by directly foaming,were obtained by firing at high *** mullite(3Al_(2)O_(3)·2SiO_(2))ceramic foams with total porosity(ε)of 83.52 vol%,high open porosity of 83.23 vol%,and compressive strength of 1.72 MPa were produced after sintering at 1400 for 2 h in℃ air without adding any sintering additives using commercial MK,bauxite,and FA as raw materials.

关键词： porous mullite ceramic porosity porous geopolymer precursor direct foaming nanophase strengthening

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3D-printed Lunar regolith simulant-based geopolymer composites with bio-inspired sandwich architectures

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Journal of Advanced Ceramics 2023年第3期12卷 510-525页

作者： Siqi Ma Yuqi Jiang Shuai Fu Peigang He Chengyue Sun Xiaoming Duan Dechang Jia paolo colombo Yu Zhou Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Key Laboratory of Advanced Structural–Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Max Planck Institute for Polymer Research Mainz 5512Germany Laboratory for Space Environment and Physical Sciences Harbin Institute of TechnologyHarbin 150001China Department of Industrial Engineering University of PadovaPadova 35122Italy Department of Materials Science and Engineering The Pennsylvania State UniversityPhiladelphia 16802USA

Over time,natural materials have evolved to be lightweight,high-strength,tough,and damage-tolerant due to their unique biological ***,combining biological inspiration and structural design would provide traditional materials with a broader range of performance and ***,the application of an ink-based three-dimensional(3D)printing strategy to the structural design of a Lunar regolith simulant-based geopolymer(HIT-LRS-1 GP)was first reported,and high-precision carbon fiber/quartz sand-reinforced biomimetic patterns inspired by the cellular sandwich structure of plant stems were *** study demonstrated how different cellular sandwich structures can balance the structure–property relationship and how to achieve unprecedented damage tolerance for a geopolymer *** results presented that components based on these biomimetic architectures exhibited stable non-catastrophic fracture characteristics regardless of the compression direction,and each structure possessed effective damage tolerance and anisotropy of mechanical *** results showed that the compressive strengths of honeycomb sandwich patterns,triangular sandwich patterns,wave sandwich patterns,and rectangular sandwich patterns in the Y-axis(Z-axis)direction were 15.6,17.9,11.3,and 20.1 MPa(46.7,26.5,23.8,and 34.4 MPa),respectively,and the maximum fracture strain corresponding to the above four structures could reach 10.2%,6.7%,5.8%,and 5.9%(12.1%,13.7%,13.6%,and 13.9%),respectively.

关键词： Lunar regolith simulant(LRS) three-dimensional(3D)printing geopolymer(GP) in situ resource utilization(ISRU) bio-inspired patterns damage tolerance

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Additive Manufacturing(AM)of Advanced Ceramics:From Materials,Structural Designing,AM Technologies,to Performance of Printed Components

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2023年第4期2卷 1-2页

作者： Zhangwei Chen paolo colombo Jens Günster Soshu Kirihara Additive Manufacturing Institute Shenzhen UniversityShenzhen518060China Department of Industrial Engineering University of PadovaPadova35131Italy BAM Bundesanstalt für Materialforschung Und-Prüfung Berlin12203Germany Joining and Welding Research Institute Osaka UniversityOsaka567-0047Japan

Advanced ceramic materials have been widely used in a range of high-end technical fields due to their high mechanical performance,chemical stability,and impressive acoustic,optical,electrical,magnetic,and thermal *** the continuous improvement of the current level of science and technology,especially in cutting-edge application scenarios,the structural and functional requirements of advanced ce-ramic parts are becoming increasingly higher.

关键词： properties. ceramic becoming

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Additive Manufacturing of Ceramics from Liquid Feedstocks

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2022年第1期1卷 16-27页

作者： Giorgia Franchin Hamada Elsayed Renata Botti Kai Huang Johanna Schmidt Giulio Giometti Alice Zanini Anna De Marzi Marco D’Agostini paolo Scanferla Yurun Feng paolo colombo Dipartimento di Ingegneria Industriale Universitàdi Padovavia Marzolo 935131 PadovaItaly Refractories Ceramics and Building Materials DepartmentNational Research CentreEl Buhouth Str.12622 CairoEgypt Department of Materials Science and Engineering Pennsylvania State UniversityUniversity ParkPA 16802USA

In this review,we summarize the research activities carried out by our research group at the University of Padova on the additive manufacturing of ceramics from liquid ***,we evaluate the use of preceramic polymers,geopolymers,and sol-gel *** mainly focus on processing with liquid feedstocks because they have some advantages with respect to slurry-based feedstocks in which powders are ***,lower viscosity,enhanced transparency,and lack of scattering and sedimentation are advantageous features for vat photopolymerization processes,whereas the absence of particulates reduces clogging problems at the nozzle for extrusion-based ***,preceramic polymers and geopolymers have some limitations in terms of the range of ceramic compositions that can be obtained;sol-gel solutions are intrinsically unstable,whereas printed objects suffer from drying ***,we successfully produced high-quality parts using a variety of additive manufacturing techniques,some of which(e.g.,volumetric additive manufacturing)have been proposed for the fabrication of ceramic components for the first time.

关键词： Additive manufacturing Preceramic polymers SiOC

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Experimental evaluation of mechanical compression of lattice trusses made with Ti6Al4V for aerospace use

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Chinese Journal of Aeronautics 2024年第5期37卷 520-532页

作者： Carlo Giovanni FERRO Sara VARETTI paolo MAGGIORE Department of Mechanical and Aerospace Engineering Politecnico di TorinoCorso Duca degli AbruzziTorino 10124Italy

Lattice structures are three-dimensional structures composed of repeated geometrical shapes with multiple interconnected nodes,providing high strength-to-weight ratios,customizable properties,and efficient use of materials.A smart use of materials leads to reduced fuel consumption and lower operating costs,making them highly desirable for aircraft ***,the customizable properties of lattice structures allow for tailoring to specific design requirements,leading to improved performance and safety for *** advantages make lattice structures an important focus for research and development in the aviation *** paper presents an experimental evaluation of the mechanical compression properties of lattice trusses made with Ti6Al4V,designed for use in an anti-ice *** truss structures were manufactured using additive manufacturing techniques and tested under compressive loads to determine mechanical *** showed that lattice trusses exhibited high levels of compressive strength,making them suitable for use in applications where mechanical resistance and durability are critical,such as in anti-ice *** also highlight the potential of additive manufacturing techniques for the fabrication of lattice trusses with tailored mechanical *** study provides valuable insights into the mechanical behavior of Ti6Al4V lattice trusses and their potential applications in anti-ice systems,as well as other areas where high strength-to-weight ratios are *** results of this research contribute to the development of lightweight,efficient,and durable anti-ice systems for use in aviation and other industries.

关键词： Additive Manufacturing(AM) Selective Laser Sintering(SLM) Anti ice systems Lattice structures Aircraft on board systems Design of Experiments(DOE)

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44%of steep slope cropland in Europe vulnerable to drought

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Geography and Sustainability 2024年第1期5卷 89-95页

作者： Wendi Wang Eugenio Straffelini paolo Tarolli Department of Land EnvironmentAgriculture and ForestryUniversity of PadovaAgripolisViale dell'Università16LegnaroPD 35020Italy

Steep-slope cropland plays a vital role in food production,economic development,ecosystem diversity,and Eu-ropean cultural ***,these systems are susceptible to extreme weather *** 2022 summer drought significantly impacted European agriculture,but the specific effects on steep-slope crops remain *** this is essential for comprehending similar future events and for implementing effective water management strategies to ensure the sustainability of steep-slope agriculture and associated ecosystem *** study quantitatively analyzes the spatial distribution of twelve major European steep-slope(>12%)crops and assesses agricultural drought severity during the 2022 events using open-access spatial *** satellite-based Vegetation Health Index(VHI)is utilized to identify critical *** show that olive grove is the most widespread crop in steep slope agriculture(34%of total area),followed by wheat(24%),maize(16%),and vineyard(11%).Almost half of the steep-slope agriculture in Europe suffered drought during summer *** were hardest affected at 79%,primarily in northern Portugal,northern Spain,southern France,and central *** followed at 62%,mainly in Spain,central Italy,southern France,and northern *** groves ranked third at 59%,with the most impact in northern Portugal,southern and central Spain,and southern *** was also significantly affected at 54%.In this paper,we therefore highlight the need to increase steep-slope agriculture resilience by improving water management and promoting sustainable land practices.

关键词： Drought Steep slope cropland Europe Sustainability

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Friction and wear performance of polyether ether ketone(PEEK)polymers in three lubrication regimes

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Friction 2024年第4期12卷 670-682页

作者： Davide MASSOCCHI Nora LECIS Marco LATTUADA Davide SCAGLIA Steven CHATTERTON paolo PENNACCHI Department of Mechanical Engineering Politecnico di MilanoMilan 20156Italy Eni SpA Downstream product R&DLombardia 20097Italy Eurobearings S.R.L. Lombardia 29016Italy

This experimental study investigates the friction and wear of three coatings commonly used in industrial applications,particularly in hydrodynamic *** three materials under investigation were Babbitt,polyether ether ketone(PEEK)reinforced with 15%carbon fibers,and PEEK reinforced with 20%carbon *** first polymer material was extruded,while the other was produced by fused deposition modelling(FDM).The materials were subjected to sliding tests in a pin-on-disc configuration,with a steel ball serving as the counter *** tests were conducted at room temperature,with a load of 10 N and under three different lubrication conditions:dry,grease,and *** linear speed was set at 0.3 m/s for the dry and semi-solid lubrication tests,while for the oil tests,the speed was set at 0.25 m/*** greases used had consistency grades of NGLI 000 and NGLI *** ISO VG 68 circulation oil was used for the oil lubrication ***,thermodynamic analyses were performed under the most severe conditions(i.e.,dry)to investigate the steel-Babbitt and steel-PEEK contact.

关键词： hydrodynamic bearings polyether ether ketone(PEEK)polymers additive manufacturing grease lubrication sliding oil lubrication ball-on-disk tribology

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Double-nylon purse-string suture technique: Another addition to the endoscopist's toolbox for full-thickness defect closure

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World Journal of Gastroenterology 2024年第25期30卷 3152-3154页

作者： Angad Walia Roberto paolo Trasolini Neal Shahidi Department of Medicine University of British ColumbiaVancouver V6Z2K5BCCanada

Iatrogenic perforation is the most feared adverse event in *** the expansion of interventional endoscopy in favor of traditional surgery,it is now more crucial than ever to develop effective defect closure *** has culminated in the dissemination of multiple novel closure technologies,including through-the-scope clips,over-the-scope clips,through-the-scope suturing and over-the-scope suturing *** this editorial,we comment on the recent publication by Wang and colleagues discussing the performance of the double-nylon purse-string suture technique in the closure of large(>3 cm)gastric full-thickness *** technique offers a promising,practical and cost-effective approach to closure of large full-thickness defects that can be readily imple-mented across diverse healthcare settings.

关键词： Cancer Endoscopy Endoscopic full-thickness resection Perforation

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Is tuberous sclerosis complex-associated autism a preventable andtreatabledisorder?

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World Journal of Pediatrics 2024年第1期20卷 40-53页

作者： paolo Curatolo Mirte Scheper Leonardo Emberti Gialloreti Nicola Specchio Eleonora Aronica Child Neurology and Psychiatry Unit Systems Medicine DepartmentTor Vergata UniversityRomeItaly Department of Neuropathology Amsterdam NeuroscienceAmsterdam UMC Location University of AmsterdamAmsterdamTheNetherlands Department of Biomedicine and Prevention University of Rome Tor VergataVia Montpellier 100133 RomeItaly Clinical and Experimental Neurology Bambino Gesù Children's HospitalIRCCSFull Member of European ReferenceNetworkEpiCAREPiazza S.Onofrio400165 RomeItaly Stichting Epilepsie Instellingen Nederland(SEIN) HeemstedeAmsterdamThe Netherlands

Background Tuberous sclerosis complex(TSC)is a genetic disorder caused by inactivating mutations in the TSCl and TSC2 genes,causing overactivation of the mechanistic(previously referred to as mammalian)target of rapamycin(mTOR)signaling pathway in fetal *** mTOR pathway plays a crucial role in several brain processes leading to TSC-related epilepsy,intellectual disability,and autism spectrum disorder(ASD).Pre-natal or early post-natal diagnosis of TSC is now possible in a growing number of pre-symptomatic *** sources We searched PubMed for peer-reviewed publications published between January 2010 and April 2023 with the terms“tuberous sclerosis",“autism",or“autism spectrum disorder""animal models",“preclinical studies",“neurobiology",and“treatment".Results Prospective studies have highlighted that developmental trajectories in TSC infants who were later diagnosed with ASD already show motor,visual and social communication skills in the first year of life *** genetic,cellular,electroencephalography and magnetic resonance imaging biomarkers can identify pre-symptomatic TSC infants at high risk for having autism and *** Preventing epilepsy or improving therapy for seizures associated with prompt and tailored treatment strategies for autism in a sensitive developmental time window could have the potential to mitigate autistic symptoms in infants with TSC.

关键词： Animal model-Autism spectrum disorders Developmental and epileptic encephalopathy Mechanisms mTOR Risk Tuberos sclerosis complex

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Cavity-enhanced photoacoustic dual-comb spectroscopy

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Light(Science & Applications) 2024年第4期13卷 610-618页

作者： Zhen Wang Qinxue Nie Haojia Sun Qiang Wang Simone Borri paolo De Natale Wei Ren Department of Mechanical and Automation Engineering The Chinese University of Hong KongNew TerritoriesHong Kong SARChina. State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences130033 ChangchunChina. CNRINO-Istituto Nazionale di Ottica and LENS-European Laboratory for Nonlinear Spectroscopy50019 Sesto FiorentinoItaly

Photoacoustic dual-comb spectroscopy(DCS),converting spectral information in the optical frequency domain to the audio frequency domain via multi-heterodyne beating,enables background-free spectral measurements with high resolution and broad ***,the detection sensitivity remains limited due to the low power of individual comb lines and the lack of broadband acoustic ***,we develop cavity-enhanced photoacoustic DCS,which overcomes these limitations by using a high-finesse optical cavity for the power amplification of dual-frequency combs and a broadband acoustic resonator with a flat-top frequency *** demonstrate high-resolution spectroscopic measurements of trace amounts of C2H2,NH3 and CO in the entire telecommunications *** method shows a minimum detection limit of 0.6 ppb C2H2 at the measurement time of 100 s,corresponding to the noise equivalent absorption coefficient of 7×10−10 cm−*** proposed cavityenhanced photoacoustic DCS may open new avenues for ultrasensitive,high-resolution,and multi-species gas detection with widespread applications.

关键词： individual cavity spectroscopy

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