NSRRC Activity Report 2022

036 NSRRC ACTIVITY REPORT 2022 Because of the small proportion of nanofibers in the cryogel (1:7), the cryogel could be fixed into a rod shape and injected to form a large sheet in 37°C water ( Fig. 5 ). The greatest volume of the second generation sponge that could be injected through a 16-gauge needle was 150% that of the first-generation shape memory cryogel and 260% that of the cryogel without shape memory. This biodegradable shape memory cryogel with a high injected Fig. 5 : Injected rod cryogel forms a large sheet of cryogel. [Reproduced from Ref. 3] volume and complex shape can be valuable for designing medical devices and tissue regeneration templates for minimally invasive surgery. (Reported by Shan-Hui Hsu, National Taiwan University) This report features the work of Shan-Hui Hsu and her co- workers published in ACS Appl. Mater. Interfaces 14 , 36353 (2022). TLS 23A1 Small/Wide Angle X-ray Scattering • In situ SAXS and WAXS • Soft Matter References 1. S.-H. Hsu, NSRRC Activity Report 2017 , 48 (2018). 2. C. Fu, W. Chuang, S. Hsu, ACS Appl. Mater. Interfaces 13 , 9702 (2021). 3. L. Juan, S. Lin, C. Wong, U. Jeng, C. Huang, S. Hsu, ACS Appl. Mater. Interfaces 14 , 36353 (2022). 4. T. Chen, C. Wong, S. Hsu, Carbohy. Polym. 285 , 119228 (2022). Skin Tactile Sensor / Electronic Skin How sensor can mimic human skin? High-stretching and self-healing polymers can be the answer in skin tactile sensors. R ecently, stretchable and simultaneously self-healable elastomers have attracted considerable attention due to their prolonged service time and their potential in human motion sensing. The self- healing ability usually originates from the reversible bonds incorporated in the polymer matrix, including hydrogen bonding, π−π stacking, ionic interactions, and metal-ligand (ML) interactions. Among them, ML coordination bonds with their highly dynamic nature and easily-fabricated properties are usually incorporated into intrinsic self-healing materials. However, despite the prosperous structural designs and several attempts to combine different metal ions and their host materials, the mechanisms behind the ML interactions remain unsolved. Fig. 1 : A schematic illustration of the design concept and chemical structures of Ni-bpyPTD. [Reproduced from Ref. 1]