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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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Fabrication of dense SiBCN monolith at a lower temperature and its high-temperature performance

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Journal of Advanced Ceramics 2024年第8期13卷 1198-1211页

作者： Zi-Bo Niu Daxin Li Dechang Jia Zhihua Yang Kunpeng Lin Yan Wang paolo colombo Ralf Riedel Yu Zhou Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150080China Key Laboratory of Advanced Structural-Function Integrated Materials and Green Manufacturing Technology Ministry of Industry and Information TechnologyHarbin 150080China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150080China Department of Industrial Engineering University of PadovaPadova 3513iItaly Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity Park 16802USA Institute of Materials Science Darmstadt University of TechnologyDarmstadt 64287Germany School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

In this study,a crack-free pyrolysis process of partially cured precursor powder compacts was developed to prepare dense silicon boron carbonitride(SiBCN)monoliths at much lower temperatures(1300℃),thereby circumventing the challenges of sintering densification(>1800℃).Unlike the elastic fracture in over-cured precursors or the viscoelastic deformation in under-cured precursors,the partially cured precursor,exhibiting elastic-plastic deformation behavior,facilitates limited nanoscale pore formation in a dense structure,achieving a balance between crack-free pyrolysis and *** to SiBCN derived from the over-cured precursor(σ=~159 MPa,K_(IC)=1.9 MPa:m^(1/2),Vickers hardness(HV)=7.8 GPa,and E=122 GPa),the resulting SiBCN monolith exhibited significantly improved mechanical properties(σ=~304 MPa,K_(IC)=3.7 MPa-m12,HV=10.6 GPa,and E=161 GPa)and oxidation *** addition,this study investigated the high-temperature performance of SiBCN monoliths,including crystallization and oxidation,and determined the oxidation kinetics induced by pore structure healing and the different oxidation mechanisms of Si-C-N and B-C-N clusters in the amorphous *** to its unique composition and structure,the SiBCN ceramic oxide layer exhibits exceptional self-healing effects on repairing the nanoporous system in the initial stage and shows outstanding high-temperature stability during prolonged oxidation,mitigating adverse effects from bubble formation and *** to the nanoporous structure,the oxidation rate is initially controlled by gas diffusion following a linear law before transitioning to oxide layer diffusion characterized by a parabolic ***,due to different valence bond configurations,Si-C-N transforms into an amorphous SiCNO structure after phase separation,unlike the nucleation and growth of residual B-N-C.

关键词： silicon boron carbonitride(SiBCN)ceramics crack-free pyrolysis amorphous structure oxidation mechanisms kinetic law

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Oxidation behavior of amorphous and nanocrystalline SiBCN ceramics–Kinetic consideration and microstructure

Advanced Powder Materials

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Advanced Powder Materials 2024年第1期3卷 144-156页

作者： Zibo Niu Daxin Li Dechang Jia Zhihua Yang Kunpeng Lin Ralf Riedel paolo colombo Yu Zhou Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150080China Key Laboratory of Advanced Structural-Function Integrated Materials and Green Manufacturing Technology Ministry of Industry and Information TechnologyHarbin 150080China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150080China Chongqing Research Institute Harbin Institute of TechnologyChongqing 401135China Institute of Materials Science Darmstadt University of TechnologyOtto-Berndt-Str.364287DarmstadtGermany Department of Industrial Engineering University of PadovaVia Marzolo9PadovaItaly Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA 16802United States School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

In this study,the structural evolution of SiBCN ceramics during crystallization and its effects on oxidation behavior involving different atomic units or formed phases in amorphous or crystalline SiBCN ceramics were *** amorphous structure has exceptionally high oxidation activity but presents much better oxidation resistance due to its synchronous oxidation of atomic units and homogeneous composition in the generated oxide ***,the oxidation resistance of SiBCN ceramic will degrade during the continual crystallization process,especially for the formation of the nanocapsule-like structure,due to heterogeneous oxidation caused by the phase ***,the activation energy and rate-controlling mechanism of the atomic units and phases in SiBCN ceramics were *** BNCx(Ea=145 kJ/mol)and SiC(2-x)(Ea=364 kJ/mol)atomic units in amorphous SiBCN structure can be oxidized at relatively lower temperatures with much lower activation energy than the corresponding BN(C)(Ea=209 kJ/mol)and SiC(Ea=533 kJ/mol)phases in crystalline structure,and the synchronous oxidation of the SiC(2-x)and BNCx units above 750C changes the oxidation activation energy of BNCx(Ea=332 kJ/mol)to that similar to SiC(2-x).The heterogeneous oxide layer formed from the nanocapsule-like structure will decrease the activation energy SiC(Ea=445 kJ/mol)and t-BN(Ea=198 kJ/mol).

关键词： SiBCN ceramics Amorphous Crystallization Oxidation Kinetics analysis

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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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Single-cell pan-omics, environmental neurology, and artificial intelligence:the time for holistic brain health research

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Neural Regeneration Research 2025年第6期20卷 1703-1704页

作者： paolo Abondio Francesco Bruno IRCCS Istituto delle Scienze Neurologiche di Bologna BolognaItaly Association for Neurogenetic Research(ARN) Lamezia TermeCatanzaroItaly

The brain,with its trillions of neural connections,different cellular types,and molecular complexities,presents a formidable challenge for researchers aiming to comprehend the multifaceted nature of neural *** traditional methods have provided valuable insights,emerging technologies offer unprecedented opportunities to delve deeper into the underpinnings of brain *** the everevolving landscape of neuroscience,the quest to unravel the mysteries of the human brain is bound to take a leap forward thanks to new technological improvements and bold interpretative frameworks.

关键词： function artificial landscape

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飞行器的电气化的实现

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现代制造 2019年第24期 52-52页

作者： paolo colombo 不详

当前航天航空工业领域中有两项能勻够对未来发展有着重要影响的电气化举措。第一项举措是MEA多电飞机的发展趋势。MEA多电飞机的方案减轻了飞行器的重量,因为越来越多的机械制造和液压系统被电力驱动装置取代了。第二项举措是越来越多... 详细信息

当前航天航空工业领域中有两项能勻够对未来发展有着重要影响的电气化举措。第一项举措是MEA多电飞机的发展趋势。MEA多电飞机的方案减轻了飞行器的重量,因为越来越多的机械制造和液压系统被电力驱动装置取代了。第二项举措是越来越多的用电力驱动或者综合型驱动系统取代了传统的机械驱动系统。电力驱动系统保证了飞行器更加高效、静音的飞行,也更加环保,满足了新的排放监管要求。

关键词：航天航空工业电力驱动系统机械制造机械驱动电气化电力驱动装置多电飞机液压系统

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Is transient elastography a useful tool for screening liver disease?

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World Journal of Gastroenterology 2009年第12期15卷 1409-1414页

作者： paolo Del Poggio Silvia colombo Hepatology Unit Treviglio HospitalTreviglio(Bg)24047Italy

Transient elastography(TE)is a new non invasive tool for measuring liver stiffness,which is correlated to the histologic stage of liver *** studies in chronic liver disease(CLD)have determined a good accuracy of TE in predicting significant fibrosis and an optimal accuracy in predicting *** liver stiffness ranges between 3.3-7.8 KPa and using a cut off of 7.1 KPa,significant fibrosis and cirrhosis can be excluded with a very high negative predictive value(NPV).Positive predictive value(PPV)for the diagnosis of cirrhosis is lower using just a single scan but increases to 90% if high stiffness values are confirmed by a second independent *** the presence of fatty liver and metabolic syndrome slightly increases the readings and may reduce the accuracy of the *** is uncertain if this increase is related to the presence of steatofibrosis or ifit is caused by steatosis *** can be used in screening patients attending the liver clinics to identify those with signifi cant fi brosis or cirrhosis and may be particularly useful in discriminating HBV inactive carriers from chronic hepatitis B ***,however,is not reliable in predicting the presence of esophageal varices in *** potential indication for TE is the systematic screening of populations at high risk for CLD,such as intravenous drug users and alcoholics,but further studies are needed to determine its diagnostic accuracy in these settings.

关键词： Transient elastography Screening Liverdisease Hepatitis B Hepatitis C Non alcoholic steatohepatitis Cirrhosis

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Peptide aptamers:The versatile role of specific protein function inhibitors in plant biotechnology

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Journal of Integrative Plant Biology 2015年第11期57卷 892-901页

作者： Monica colombo Chiara Mizzotti Simona Masiero Martin M.Kater paolo Pesaresi Research and Innovation Centre Fondazione Edmund MachSan Michele all'Adige(Trento) Department of Biosciences University of Milan

In recent years, peptide aptamers have emerged as novel molecular tools that have attracted the attention of researchers in various fields of basic and applied science, ranging from medicine to analytical chemistry. These artificial short peptides are able to specifically bind, track, and inhibit a given target molecule with high affinity, even molecules with poor immunogenicity or high toxicity, and represent a remarkable alternative to antibodies in many different applications. Their use is on the rise, driven mainly by the medical and pharmaceutical sector. Here we discuss the enormous potential of peptide aptamers in both basic and applied aspects of plant biotechnology and food safety. The different peptide aptamer selection methods available both in vivo and in vitro are introduced, and the most important possible applications in plant biotechnology are illustrated. In particular, we discuss the generation of broad- based virus resistance in crops, ＂reverse genetics＂ and aptasensors in bioassays for detecting contaminations in food and feed. Furthermore, we suggest an alternative to the transfer of peptide aptamers into plant cells via genetic transformation, based on the use of cell-penetrating peptides that overcome the limits imposed by both crop transformation and Genetically Modified Organism commercialization.

关键词： Biosensors functional genomics peptide aptamers resistance

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