Fluorescent nanocapsules containing Eu3+ complex are prepared by the internal phase separation of poly(methylmethacrylate) (PMMA) within the droplets of oil/water nano-emulsion. The nanocapsules give bright red emission excited by UV irradiation and possess stable fluorescence properties. Their fluorescence intensity is primarily influenced by the emulsifier concentration. It is significant that the fluorescence of the nanocapsules is nearly pH-independent and can be kept for a long time in a wide pH range. In contrast, the fluorescence of Eu 3+ complex is easily quenched in acidic or alkalic medium. The mean nanocapsule size is tunable with the concentration and the mode of emulsifier addition. As soft templates, oil cores have potential applications for the incorporation of functional components or drugs.

Since the outbreak of COVID-19 at the beginning of 2020, students are unable to come back to study on campus. Under this situation, College of Chemistry at Jilin University organizes the online teaching of polymer chemistry for students with chemistry major (non-polymer major), followed by the offline teaching plus the construction of course ideology and politics in polymer chemistry. According to the basic knowledge and characteristics of students with chemistry major, teachers pay more attentions on developing their interests in polymer instead of just telling them to remember the knowledge, realizing the combination between ideological and political education and knowledge system education. By taking the advantages of online teaching, offline teaching and ideological and political education, the teaching quality is improved and the teaching task is completed successfully.