Research Seminar Series
Please contact the Seminar Series Coordinator if you have any queries regarding any upcoming events.
- Rona Chandrawati, Chemical and Biomolecular Engineering (J01)
About the Speaker
Diane Hildebrandt is currently a Professor of Chemical Engineering and co-Director of the Material and Process Synthesis (MaPS) research unit at the University of South Africa (UNISA). She was the first woman in South Africa to be appointed a full professor of Chemical Engineering when she was the Unilever Professor of Reaction Engineering at the University of the Witwatersrand. She became the first woman professor of Chemical Technology in the Netherlands when she was appointed as a part-time Professor of Process Synthesis, University of Twente. She holds a B.Sc., M.Sc. and Ph.D. in chemical engineering from University of the Witwatersrand. Her current research area is the design of energy efficient processes and equipment, with the view to reducing carbon dioxide emissions from chemical processes. She has had numerous awards and gold medals including the African Union Continental Scientific Award.
Distillation is the most important separation technique in the chemical industry, but unfortunately it is also the most energy intensive. In earlier times this latter problem was not of particular concern. However in these days of climate change and attempts to reduce carbon dioxide emissions it is important that we take a relook at how we design efficient distillation systems. Simple graphical techniques can be particularly useful in this regard as they can help to give insight into how these improvements can be made. We have developed the method of Column Profile Maps (CPM) to help. This talk will explain the method and how it can be used to design complex and more efficient distillation systems such as for example Petluyk and Kaibel Columns and Reactive Distillation Systems.
About the Speaker
Prof. Chi-Chang Hu received his Ph.D. from National Cheng Kung University in Electrochemical Engineering in 1995. He is currently a chair professor in the Department of Chemical Engineering at National Tsing Hua University, where he runs the Laboratory of Electrochemistry & Advanced Materials (LECAM). He has won the 46th Annual Ten Outstanding Young Persons Award of Taiwan (2008) and the SCEJ Award for Outstanding Asian Researcher and Engineer of Japan (2014). His research interests include electrochemical deposition of nanostructured oxides, semiconductors, alloy, metals, and their applications for electrochemical energy storage and conversion systems, (bio)sensors, photocatalyst and surface finishing.
This talk will give a brief review on the preparation, characterization, and applications of graphene sheets. After this introduction, two examples of graphene/CNT composites and CVD-grown graphene samples for various electrochemical applications will be given.
Stacking of individual reduced graphene oxide (RGO) is effectively inhibited by introducing one-dimensional carbon nanotubes to form a 3-D hierarchical structure which enhances the utilization of RGO-based composites.
We successfully manipulate the defect density and thickness (number of layers) of few-layer graphene sheets at low temperatures ( < 300 degC) using microwave plasma torch (MPT) coupled with plasma-enhanced chemical vapor deposition (PECVD) method.