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Xinhua Liu has completed her PhD from Tongji University and Postdoctoral Studies from Dyson School of Design Engineering, Imperial College London, UK. She has great interests in material science and electrochemical engineering, working to develop scalable technologies to produce energy materials for various energy applications. With a great interest in design high performance batteries and battery packs from micro-scale to grid level, Xinhua has published more than 30 papers in recent five years including Advanced Materials, Advanced Science.
Energy devices, such as supercapacitors, Lithium-ion batteries, have now become the most critical component for electric vehicles (EV) and consumer electronics with improvements in energy and power density. The key aspects of a battery pack which define its performance are mainly the electrode and electrolyte chemistry selection, single cell performance and battery management.
This talk will discuss the issues and challenges of the batteries and how to develop high performance batteries via multi-scale design, including the electrode/electrolyte material selection and structure design, the scaffold design for structural devices, and the battery pack design. Advanced X-ray tomography technology is employed here for structure characterization and further understand the degradation mechanism.
Guidance in materials, manufacturing technology and pack design will be given. More focus will be given to the highly engineered electrospinning technology which can produce nanostructured functional materials, specifically carbon nanofibres/nanotubes, for fabrication of various electrochemical applications. The model based battery pack design will also be discussed to understand overall performance of lithium-ion battery pack due to cell-to-cell variations, thermal gradients and/or cell interconnects.
Oral Session 1:
- Analytical Techniques and Instrumentation in Materials Chemistry | Nanomaterials and Nanotechnology | Characterization and Testing of Materials | Materials Science and Engineering
Title: Functionalized Al2O3 nanoparticles from superhydrophobic derived Surfaces to enhanced oil recovery applications
Chenhui Zhu is a professor of school of chemical engineering, Northwest University, China, Director of Shaanxi Key Laboratory of Degradable Biomedical Materials. She received her Ph.D. degree in Northwest University in 2008, studied in the department of biomedical engineering of Duke University as a visiting scholar from 2012-2013. She won the 11th Shaanxi Youth Science and Technology Award, Shaanxi Youth Science and Technology Innovation Leader Award and Xi'an Academic and Technological Leader Award. Her research area focuses on biomaterials and protein engineering. Up to now, she has published over 60 papers and 2 books, holds 15 patents.
Hydrogel is a kind of hydrophilic soft material with a three-dimensional network structure and has a broad application prospect in the field of medicine. The wound dressings to meet the clinic needs are the seeking goals of scientists. Natural biological materials have excellent biocompatibility. Human-like collagen-hyaluronic acid-carboxylated chitosan (HLC-HA-CCS) complex hydrogels crosslinked with glutamine aminotransferase (TG) are prepared for wound dressing. HA elevates the compressive stress, CCS increases the anti-deformation, HA and CCS together contribute to improve the porosities, swelling and water retention properties. Full thickness skin defect experiments show that HLC-HA-CCS hydrogels can promote wound healing in comparison with traditional ones.
However, the mechanical properties of hydrogels made from natural materials are poor, and the antimicrobial, moisturizing performance as well as bacteria resistance fail to meet the requirements of wound healing. Therefore, a double-layer polyvinyl alcohol-polyethylene glycol-sodium carboxymethyl cellulose (PVA-CMC-PEG) hydrogel are prepared to solve the above problems.
The double-layer hydrogels present a tight upper layer with smaller pore size and a loose lower layer with larger pore size, which can meet the absorption of seepage and bacteria resistance at the same time. The pore size at the longitudinal section presents a trend of gradual reduction and the two layers are bonded tightly. Furthermore, the double-layer hydrogels have a suitable water vapor transmission rate, excellent moisturizing effect, bacteria resistance ability and are non-sticky to the wound. Besides, the hydrogel have no toxic effects on cells. Full-thickness skin defect experiment shows that the double-layer PVA-CMC-PEG hydrogels canenhance wound healing greatly and would be ideal wound dressings.