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The seminar commenced with a welcome speech and speaker introduction by Prof. WANG Zuankai, Associate Vice President (Research and Innovation) of PolyU. This was followed by Prof. Leng’s presentation. He first provided a brief background about shape memory polymers (SMP), pointing out that these smart materials can reversibly change between permanent and temporary shapes in response to changes in external stimuli such as temperature. Next, he gave an overview of the researchers from different scientific research institutions and universities around the world who specialise in SMP research, and the types of SMP materials that HIT researchers focus on. He said that SMP are hard to actuate and their recovery strength and speed are low, and so relevant solutions to these challenges are important for the development of SMP composites (SMPC). Prof. Leng then gave examples demonstrating how SMPC can be prepared through actuation methods involving different stimuli such as heat, electricity, magnetism, radio frequency, solution/water, light, etc. He mentioned that SMPC can be used to prepare various structures for aerospace, smart manufacturing, photoelectric applications, microelectromechanical systems applications, and smart clothing. After that, Prof. Leng introduced 4D printing, a novel additive manufacturing process for producing printed objects that can adaptively change their configurations/properties in response to external stimuli. He mentioned that 4D printing is important for producing a range of SMPC-based materials for biomedical applications. To conclude, Prof. Leng said that SMP research is a fast-growing emerging research field. He anticipated that shape memory smart structures incorporated with sensors, actuators, and controllers, would be widely used in aerospace, civil aviation, automotive, energy and daily life.
Event date: 15/07/2024
Speaker: Prof. LENG Jinsong
Hosted by: PolyU Academy for Interdisciplinary Research
- Keywords:
- Shape memory polymers Polymeric composites Additive manufacturing Smart materials
- Resource Type:
- Video
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Others
In this animated activity, learners view the following physics concepts in action: force, friction, horsepower, work, power, inefficiency, resistance, inertia, and energy.
- Subjects:
- Physics
- Keywords:
- Hydraulics Motion
- Resource Type:
- Others
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Others
In this animated object, students examine what happens when electrons share molecules.
- Subjects:
- Chemistry
- Keywords:
- Chemical bonds
- Resource Type:
- Others
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Others
In this animated and interactive object, learners examine kinetic and potential energy as well as the first law of thermodynamics and the flow of energy between a system and its surroundings. Students also answer questions about exothermic and endothermic reactions
- Subjects:
- Chemistry
- Keywords:
- Chemical processes Chemical reactions
- Resource Type:
- Others
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Video
Speaking one month after the massive Gulf of Mexico oil spill, Lisa Margonelli shows how drilling moratoriums and executive ousters make for good theater, but distract us from the issue at heart: our unrestrained oil consumption. She shares her bold plan to wean America off oil -- by confronting consumers with its real cost.
- Subjects:
- Environmental Sciences
- Keywords:
- Fossil fuels -- Environmental aspects Petroleum industry trade -- Political aspects Petroleum
- Resource Type:
- Video
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Video
In 46 episodes, Hank Green will teach you chemistry! This course is mostly based on the 2012 AP Chemistry curriculum, but it also covers some introductory organic chemistry. By the end of the course, you will be able to: * Utilize the fundamental tools of chemistry, including the periodic table, nomenclature, and basic lab safety techniques * Understand the structure of matter * Predict and explain chemical reactions, and comprehend the many ways they affect our world * Reason through problems involving kinetics, thermodynamics, and chemical equilibrium * Recognize different organic chemicals and their uses