Prof. SING Swee Leong,National University of Singapore
Dr Sing Swee Leong is an Professor at the Department of Mechanical Engineering, National University of Singapore (NUS), Singapore. Prior to joining NUS, he was a Presidential Postdoctoral Fellow at the School of Mechanical and Aerospace Engineering and Singapore Centre for 3D Printing, Nanyang Technological University, Singapore, after receiving the prestigious fellowship. His research interests are enabling material development and creating strategic values for Industry 4.0 and beyond through the use and integration of advanced manufacturing. Swee Leong was named a Highly Cited Researcher by Clarivate in 2022. In the same year, he was also awarded the Young Professional Award by ASTM International for his work in additive manufacturing and contribution in standard development for the field. As of March 2023, he has co-authored 59 peer reviewed articles in the field of additive manufacturing or 3D printing. He currently has a h-index of 33, with more than 5000 citations based on statistics from Web of Science. Swee Leong is also the co-inventor for three patents in additive manufacturing.
Title: Emerging Material Systems for Metal Additive Manufacturing
Abstract: As we prepare for Industry 4.0, there is a need for manufacturers to adopt new innovative technologies such as additive manufacturing (AM) or 3D printing for them to remain competitive. With AM, there is a shift in the manufacturing paradigm. Scientists and engineers can now conceive products that are previously hard to achieve using this evolving technology. However, one of the key challenges faced by AM today is the limited materials available for metal AM. In this seminar, two approaches, namely in-situ alloying and multi-metals processing, that are targeted to address this challenge will be presented.
Majority of the traditional materials used in conventional manufacturing are not designed or optimised for AM. A novel approach, known as in-situ alloying, is used to expand the library of available materials. Rapid modification of alloy compositions is made possible through design of experiments. Due to the peculiar powder-metallurgy and characteristics of AM, investigation of alloys that are previously inaccessible is now possible. It is found that the microstructure evolution of alloys formed in-situ is influenced by the dislocation and grain boundaries through diffusion enhancement which facilitates heterogeneous nucleation. Moving forward, the porosity-segregation dilemma observed in this approached need to be solved in order to achieve improved mechanical and physical properties.
Multi-metals processing remains another challenge for metal AM, especially for the powder bed fusion processes due to a lack of understanding at the interface between two discretely different metals. The functionality of components can be greatly increased by AM if they can have the properties of two or more discrete metals or alloys. Novel processing strategies have been developed to locally control the constitution, morphology, dispersion and transformation behaviour at the interface after understanding the interfacial properties. This allows prediction and modification of compatibility of multi-metals processing through metal AM.
Looking into the future, a “plug and play” approach to metal AM can be made possible through the understanding of fundamental sciences related to the processes, properties and performances of AM metals. In recent years, many numerical approaches have been developed to make reliable predictions by process parameter modifications. To fully realise the potential of in-situ alloying and multi-metals processing, there is need to synergise between simulations and experiments. A “digital twin” that describe the process in the virtual domain will allow current approach in AM development to move away from the current trial-and-error methods to a more knowledge-based approach. This knowledge-based approach allows the integration of machine learning and data analytics into AM, fully realising the potential of Industry 4.0.
Prof. Liqiang Zhu,Ningbo University
Prof. Li Qiang Zhu obtained the Ph.D. degree in Condensed Matter Physics from Chinese Academy of Science in 2007. After graduation, he joined the CEA-DSM/IRECAM/SPCSI(CEA-Saclay, France) as a Postdoctoral Research Fellow. Then, he went to the University of Tokyo (Department of Materials Engineering) as a Japan Society for the Promotion of Science (JSPS) Postdoctoral Research Fellow for two years (2008-2010). Later, he joined Ningbo Institute of Materials Technology and Engineering as an associate professor and professor from (2010~2019). Since 2019, he is a professor at Ningbo University. His research interests focus on interface physics of functional materials and applications in new conceptional devices. He has authored or co-authored over 110 peer-review papers, including Nature Communications, Advanced Materials, Advanced Functional Materials, Applied Physics Letters, IEEE Electron Device Letters, etc. He currently has a h-index of 30
Title: Proton gated oxide neuromorphic transistors with perceptual learning activities
Abstract: Brain-inspired neuromorphic engineering is becoming a hot topic in the field of information technology. Especially, designing neuromorphic devices is becoming an important branch of artificial intelligence (AI) and neuromorphic engineering and it will inject new vitality for the developments of AI. Additionally, inspired by the multifunctional sensory nervous system, intelligent cognitive platforms have also been proposed. As is getting a new branch of the brain inspired neuromorphic systems.With the inherent priorities, ionotronic devices have been proposed to construct neuromorphic devices. Moreover, functional sensors have also been integrated with neuromorphic devices to build neuromorphic systems with functions of tactile,visual, auditory, gustatory, and olfactoryperception. In our case, we have obtained solid state electrolyte films, demonstrating strong proton coupling effect. Oxide neuromorphic transistors with multi-gate configuration have been fabricated by adopting a low-cost processing, demonstrating low operation voltage as low as 1.5V. With multi-gate synergic coupling, dendrite integration functions have been mimicked under heterosynaptic mechanisms.We have also obtained neuromorphic device with low energy consumption. The lowest energy consumption is only ~1.2fJ for a single synaptic response. Additionally, the device demonstrating pseudo diode operating mode. Thus, the device can simulate a variety of biological synaptic response behaviors on a single device. An artificial neural network (ANN) is established to conduct supervised learning using MNIST handwritten data sets. The recognition accuracy reaches ~90%, which is comparable to the ideal recognition accuracy. Furthermore, a high sensitive flexible tactile perceptual interactive platform is proposed, composed of PDMS-based tactile sensors and a flexible chitosan-gated oxide neuromorphic transistor.The proposed neuromorphic devices have great potentials in brain-inspired multifunctional neuromorphic platforms.
Prof. Xunlin Qiu, East China University of Science and Technology
Xunlin Qiu received his PhD from Tongji University in 2006. From 2006 to 2020, he worked in teaching and research at the University of Potsdam and the Technical University of Chemnitz in Germany. In 2017, he obtained the highest German university degree, the Habilitation (Dr. rer. nat. habil.) from the University of Potsdam. Since 2020, he has become a professor of Special Appointment (Eastern Scholar) at East China University of Science and Technology in Shanghai, China. He has won the Special Prize for Polymer Science in Brandenburg, Germany and the First Prize for Scientific and Technological Progress in China's Petroleum and Chemical Industry. He a scientific advisory member of the International Symposium on Electrets (ISE), a subject editor of the IET Nanoelectronics journal, an IEEE and DEIS Senior Member, and a member of the Special Committee on Dielectric High Molecular Composite Materials and Applications of the Chinese Composite Materials Society. His research interest is functional dielectrics and electrets, and piezoelectricity in polar polymer films and non-polar polymer foams and its applications. He has authored or co-authored two book chapters and over 100 scientific journal and conference papers.
Title: Advanced heterogenous polymer electrets with high piezoelectric sensitivity for transducers
Abstract: The demand for advanced functional materials in transducer technology is growing rapidly. Piezoelectric materials transform mechanical variables (strain/displacement or stress/force) into electrical signals (electric displacement/charge or electric field/voltage) and vice versa. Ferrooelectrets (also called piezoelectrets) are a relatively young group of piezo-, pyro- and ferroelectric materials. They exhibit ferroic behavior phenomenologically undistinguishable from that of traditional ferroelectrics, although the materials per se are essentially non-polar space-charge electrets with artificial macroscopic dipoles (i.e., internally charged cavities). Ferroelectrets combine large piezoelectric sensitivity and mechanical flexibility and elastic compliance, and therefore attract extensive attention from academia and industry. In this presentation, the state of the art and progress trend in the field of ferroelectret research will be reported and discussed regarding the techniques for preparing ferroelectrets, the mechanisms of charging and of the resulting piezoelectricity. In addition, some examples of relevant applications will also be demonstrated.
Prof. Su Chen,Nanjing Tech University
Dr. Su Chen, Professor II, Doctoral Supervisor, Highly Cited Scholar, Chief Scientist of National Key R&D Project, Vice Dean of School of Chemical Engineering, Nanjing Tech University, Director of Jiangsu Provincial Key Laboratory of High Technology Research on Fine Functional Polymer Materials. From 2002 to 2004, he worked in the Department of Chemistry, University of Massachusetts and the Department of Polymer Science, University of Southern Mississippi, USA. From 2002 to 2004, he worked as a postdoctoral fellow and researcher at the Department of Chemistry, University of Massachusetts and the Department of Polymer Science, University of Southern Mississippi. His research interests include: microfluidic-based molecular assembly and design of dexterous materials, spinning chemistry, quantum dots, photonic crystal materials, nano-macro inorganic-organic molecular assembly functional polymer materials, front-end polymerization reaction engineering, microfluidic technology, hydrogel materials. Meanwhile, he is engaged in research oriented to engineering application technologies in the fields of functional polymer materials, engineering plastics (nylon modification, polyurethane resin modification, functional PP, PE, PS, PET modification), fine chemicals, semiconductor materials, nano-hybrid materials, fluorescent materials, LED light-emitting devices, PBAT degradable materials, green bio-manufacturing, plastic additives, water-based resins, etc.
Title: Microfluidic spinning chemistry and 3D microfluidic printing
Abstract: Microfluidic spinning technology is an ideal microreactor platform for the production of anisotropic ordered microfibers. In virtue of the precise and controllable shape, size and composition of fibers, as well as the high efficiency of mass and heat transfer, and green reaction process, microfluidic spinning has attracted wide attention. Herein, we systematically introduced a series of applications of fluorescent hybrid heterogeneous fibers constructed by microfluidic spinning technology. We proposed a simple and rapid fiber spinning chemistry (FSC) strategy, and realized the large-scale production of morpho-controllable one-dimensional ordered nanofibers (array, Janus, bamboo), two-dimensional ordered photonic crystal films and three-dimensional ordered Janus microbeads. In addition, by combining microfluidic spining with microfluidic chips, multifunctional nanomaterials were constructed and their applications in microreactors, supercapacitors, wearable devices and biomaterials were realized, which laid a foundation for multifunctional micronano fibers via microfluidic spinning technology. Moreover, a series of living materials with biocatalytic function have been prepared by microfluidic 3D printing technology. This microfluidic 3D printing technology not only improves the specific surface area of living materials and mass transfer efficiency, but also enhances the biocatalytic effect of the whole living materials. microfluidic 3D printing technology can regulate the distribution of cells in space, providing a powerful tool for the study of microbial symbiosis.
Assoc. Prof. Boon Tong Goh,University of Malaya
Dr. Boon Tong Goh graduated with a B.Sc. degree in Physics from the University of Malaya, Kuala Lumpur, Malaysia in 2001. He continued to pursue postgraduate studies for his M.Sc. and Ph.D degrees at the same university. He obtained his M.Sc and Ph.D. degrees on years 2005 and 2012 respectively. His postgraduate research was focused on Si-based semiconductor thin films deposition and applications. During his studied, his achievements include MASS 2001 Awards (The Best Thesis Awards for Final Year Project of Undergraduate Science) given by the MASS Malaysia and Excellence Award 2012 (for PhD Candidate with Highest Impact Publications in category of Sciences) given by the University of Malaya. Upon completion of his PhD, his was employed by the University of Malaya as a Senior Lecturer at the Department of Physics, Faculty of Science. His current research interests include Si-based thin films and nanostructures: growth and applications, plasma processing on semiconductor materials and semiconductor oxides and nitrides materials.
Title: Synthesis of Semiconducting Nanowires for Energy Applications
Abstract: One-dimensional (1D) based nanowire electrode has been recently attracting extensive interest in energy storage and conversion applications owing to its unique physical properties of extremely large surface-active areas and good electrochemical capability. In our group, we grown various types of 1D nanowires from single-crystal nickel silicide and silicon nanowires to Ni2Si/SiC core-shell nanowires, manganese silicide (MnSi), and higher manganese silicide (MnSi1.7) nanowires. High metallic nanowires such as Ni2Si, MnSi, and their heterostructures possess excellence physical properties such as thin, straight, long, and single-crystalline structure which resulting to high aspect ratio above 1, 000 and extremely large surface-active area in an order of 1012 NWs/cm2 . The fabricated Ni3Si2 NWs/activated carbon-based asymmetric supercapacitor demonstrated a maximum specific capacity of 578.3 C/g and energy density of 62.24 Wh/kg at 387.5 W/kg, and good cyclic stability with 76 % of capacity retention after 3, 000 cycles. The energy and power densities bridging the gap between the batteries and supercapacitors. The Mn4Si7 thin nanowires exhibited ferromagnetic behavior at roomtemperature and the magnetization was greatly improved at low temperature up to 4 K. The hybrid 1D heterostructure of Ni2Si/SiC core-shell nanowires improved electrical conductivity (9.10 × 103 -1 cm-1 ) and electrochemical stability (above 80 % capacity retention) compared to intrinsic Si and SiC nanowires. These enhanced properties of these nanowires could potentially use for nanowires-based devices in harsh environment applications such as field effect transistors, field emitters, space sensors, electrochemical devices, and supercapacitors.
Prof. Ruixiang Bai, Dalian University of Technology, China
Professor, Department of engineering mechanics, Dalian University of technology, doctoral supervisor, a permanent member of State Key Laboratory of Structural Analysis for Industrial Equipment, Director of China Society for Composite Materials, "Hundred, Thousand, and Ten Thousand Talents Project" in Liaoning province. The main research directions include micromechanical analysis and design of advanced materials, damage and bearing capacity of damaged engineering structures, dynamics and fault diagnosis of composite structures, analysis and numerical simulation of composite engineering structures, repair and strengthening mechanism of damaged engineering structures. He has presided over and participated in a number of major national projects and NSFC projects. In recent years, he has been responsible for more than 20 projects of failure behavior tests and numerical simulations of composite structures in aerospace engineering such as national large aircraft and lunar exploration. Nearly 200 academic papers have been published, and more than 50 papers have been indexed by SCI.
Title: Study on characterization of interface parameters and crack propagation of composite laminates considering fiber laying direction
Abstract:Continuous carbon fiber reinforced polymer composites (CFRP) are commonly used in aircraft structure design. The interface stress is easy to cause interlaminar delamination, resulting in crack propagation and early failure of the structure. In this work, the influence of fiber laying direction and the fiber bridging behavior at the crack tip during delamination propagation are fully considered. The meso interface debonding of carbon fiber/ polymer system, the interface fracture and fatigue crack propagation behavior of composite two-phase materials are systematically studied. With the test methods and fracture mechanics methods, the interface failure behavior of fiber/ polymer interface and laminate are deeply evaluated.
Firstly, this work develops the micro-droplet virtual test method, analyzes the influence of component phase material parameters, geometric parameters and curing temperature on the interface strength, and finds the main controlling factors of debonding failure mode. In the numerical model, the flexibility of the free section of the fiber in the test process and the residual stress produced by high-temperature curing are considered. The stress transfer mechanism and failure mechanism of the interface between the reinforced fiber and the resin matrix in the process of droplet debonding are analyzed from three typical stages.
Secondly, considering the influence of local adjacent ply fiber direction, the characterization method of fiber laying direction related delamination fracture toughness is developed, and the fiber bridging behavior produced in delamination propagation and its contribution to fracture toughness are discussed. The mode I and mode II delamination specimens with six different ply interfaces were designed. The modified beam theory data reduction scheme is used to characterize the mode I fracture toughness of different ply interfaces. Based on the "Jump" phenomenon in the fracture process, the scattered points of R curve are filtered. The delamination failure mechanism of different local ply interfaces is analyzed. The mode II fracture toughness of different ply interfaces was characterized and compared by compliance method by NPC and PC experiments.
Thirdly, based on the cohesive zone model (CZM) of finite element method, the mode I fracture behavior of different ply interfaces is predicted by trilinear traction-separation criterion, and the effective interlaminar interface parameters are characterized, and the traction-separation relationship of mode II delamination interface is characterized by bilinear CZM, and the mode II delamination fracture process of different ply interfaces is reproduced in ABAQUS. The axial compression finite element model of rectangular laminates with circular embedded delamination is established. The deformation of the specimen surface is measured and the displacement field is reconstructed by using 3D-DIC, and the effectiveness of the proposed interface model is proved by comparing with the finite element results.
Prof. Gang Shao, Zhengzhou University, China
Prof. /Dr. Gang Shao received his Ph.D. degree in Department of Materials Science and Engineering from University of Central Florida, Orlando, USA. Currently, he is a professor in School of Materials Science and Engineering, Zhengzhou University (China). His research interests include polymer-derived ceramics (PDCs), harsh environment sensing materials and devices and field assist ceramic fabrication technique. Dr. Shao has published more than 70 peer-reviewed papers including 7 ESI highly cited papers. Dr. Shao has given more than 10 keynote and/or invited talks.
Prof. Fanian Shi, Shenyang University of Technology, China
Fanian Shi, Ph. D., Professor of Shenyang University of Technology, supervisor, member of Energy and Environment Committee of China Energy Society, executive director of the first Board of Directors of the National for the Development of New Materials and Technology. From 1991 to 1996, studied for his master's degree in the National Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences; from 1996 to 2001, worked in the National Key Laboratory of Coordination Chemistry, Nanjing University for postdoctoral research and teaching (associate professor) at Nanjing Normal University; and from 2001 to 2014, worked as a postdoctoral and research fellow in the Department of Chemistry, Aveiro University, Portugal. At present, the main research areas include: design and structure optimization of metal complex materials, composite materials, lithium ion battery materials, photocatalysts, absorbing materials and so on. More than 130 academic papers were published, of which more than 120 were SCI indexed, including Journal of the American Chemical Society、Chemcomm、Acs Sustainable Chemistry & Engineering etc. Presided over the National Natural Science Foundation of China project, Liaoning Province Department of Education key project. As President of the Conference, the International Conference on New Materials was successfully held at Shenyang University of Technology in September 2019(NMS-XV IUPAC).
Title: Study on rare-earth stabilized metal oxides as anode materials
Abstract: Our team studied the electrochemical properties of new anode materials, especially the preparation of manganese-cobalt-nickel-based polymetal coordination polymers (CPs), explored the structures and lithium storage properties of lithium ionic batteries (Libs), the combination of CPs, metal oxides, and the influence of rare earth elements on lithium storage properties of the oxide composites. The following three conclusions are summarized: 1. Under the same conditions, different crystal structures have a great impact on electrochemical performance, relatively speaking, the higher capacity of complexes are with more stable structure; 2. Comparing with polymetallic coordination polymers of the same structure, the electrochemical properties of manganese-cobalt and nickel are different; 3. Cerium plays a stable role on the electrochemical properties of metal complexes, mainly inhibiting the decomposition of the complex structure and providing lithium ion transport channels to improve lithium storage performance.