시간 : 11월 07일 P.M 2:00
장소 : 302관 410호
초청 교수님 : 유재영 교수님
연사님 성명 : (1 ) 페이첸 교수님
( 2 ) 윤용진 교수님
연사님 소속 : (1 ) NTU
( 2 ) 카이스트
(1)
강연 제목 :
Silicon Nano Thin Film Micro-solid Oxide Fuel Cells For Low Temperature Operation
내용 :
This talk will give an introduction of the state-of-art micro solid oxide fuel cells (micro-SOFCs) using silicon-based micromachining technology to achieve a breakthrough increase in lateral dimension of such electrochemical energy conversion devices. The lateral dimension of the nanoscale thin film electrolyte membrane, which the thickness is only tens of nanometer, has been chronically limited to only hundreds of micrometers scale due to the fragile thin oxide membrane. Through our unique design from the mechanics approach to relieve the stress level of the membrane, and with the help of a simple combinatorial etching process, the lateral dimension of the micro-SOFCs electrolyte membrane was increased to several millimetres scale. The technology breakthrough introduced here can further the practical application of such promising device closer to commercial manufacturing stage in the area including unmanned aviation vehicles (UAVs) or military drones.
In addition to the fuel cell research, I will also give an overview of our work on 4D printing, as well as the activities in Singapore 3D printing center.
Speaker Bio:
Dr. Su’s research interests are in applying microsystem technologies, nanoscale thin film materials engineering, and nano-patterning technologies at the interface of energy conversion devices, specifically fuel cells. She pioneered in development of high power density nano thin film oxide fuel cells at low operating temperature and keeps leading cell performance in the literature. Her research interests include low temperature solid oxide fuel cells, micro/nano fabrication, nanoionics, and thin film energy materials. Her research group focuses on developing new electrode and electrolyte materials and nano-engineering of cell components via thin film deposition technologies, design and fabrication of scalable micro-SOFCs, and study of reaction kinetics between cathode and nano thin film electrolyte interface, all together with an ultimate goal of commercializing a practical device for SOFCs below 500°C. Dr. Su has also been working on additive manufacturing for SOFCs as well as using stereolithography (SLA) for 4D printing of smart shape memory polymers.
(2)
강연 제목 :
Toward sustainable 3D printing technology: Ultra fast and low cost 3D hologram printing
내용 :
concept of non-conventional 3D additive manufacturing is introduced for biomedical research. The ultimate aim of non-conventional 3D additive manufacturing is to develop a high-throughput, low-cost process for 3D additive manufacturing microstructures in hydrogels. The project centres on Three-Dimensional Hologram Lithography as a novel 3D printed microstructure fabrication process. Applications of these microstructures include making tissue scaffolds for regenerative therapies, for pharmaceutical screening, and for fundamental in vitro biological experiments.
The outstanding features of 3D Hologram Printing system are mainly attributed by the transparent diffractive optical elements (DOEs) of linear binary Fresnel lens fabricated to control the luminous intensity distribution. These DOEs of different patterns are arranged in series on a cover slip with each optical element designed to focus and diffract light at a particular plane within the device. Coupled with other components of the system, 3D hydrogel cellular scaffolds can be easily printed via effective and efficient one-step light exposure to the photo-crosslinkable polymer solution upon demand. The combined outstanding features of photo crosslinking and diffractive optical technique incorporated within this system enable the patterning of hydrogel within seconds for not only bulk structures, making large-scale fast production feasible, but also for localized, specific areas of interest, making printing of complex features simple. With this 3D Hologram Printing system, 3D two-layered hydrogel woodpile structures were successfully fabricated within 3 seconds.
