0428同步年報-2021-全

032 ACTIVITY REPORT 2021 molecular length). The bulk AWC array developed in this work provides comparable water permeability at transport length of hundreds of µm ( Fig. 1(e) ), showing that, with a great control in the mesoscale structures, the synthetic molecule is able to transfer their molecular functions hierarchically into useful material properties. Water plays important roles in physiological functions of living matter. Through dynamically interacting with biomolecules, water assists them to switch quickly between different physical states under ambient conditions. Combining suitable molecular designs and profound structural characterizations at the NSRRC, the study turns the role of water in the supramolecular chemistry of the synthetic molecule from passive to active. The WISA process allows water to govern the self-assembly and function of the synthetic molecule as it does to biomolecules. The quick physical transformation resulting from the dynamic interaction with water is highly desirable for the development of condensed-phase soft materials and might inspire more innovation in the development of self- assembled functional materials. (Reported by Chien-Lung Wang, National Yang Ming Chiao Tung University) This report features the work of Chien-Lung Wang, Wei- Tusng Chuang and their collaborators published in ACS Nano 15 , 14885 (2021). TLS 23A1 Small/Wide Angle X-ray Scattering TLS 01C2 X-ray Powder Diffraction TLS 17A1 X-ray Powder Diffraction • SAXS, WAXS, GI XRD, In-situ SAXS • Supramolecular Chemistry, Artificial Water Channels, Materials Science, Condensed-matter Physics Reference 1. H. Y. Chang, K. Y. Wu, W. C. Chen, J. T. Weng, C. Y. Chen, A. Raj, H. O. Hamaguchi, W. T. Chuang, X. Wang, C. L.Wang, ACS Nano 15 , 14885 (2021). Application of Synchrotron Microbeam X-rays to Mechanisms of Periodic Assembly of Polymeric Ring-Banded Spherulites Periodic patterns are commonly seen in nature, and spontaneously form on nanometer molecular to macro-cosmic scales, as illustrated in Fig. 1. Fig. 1 : (a) Broccoli flower with fractal pattern in a Fibonacci sequence, (b) Liesegan ring pattern on dropping a crystal of silver nitrate onto a thin gel layer containing potassium dichromate, and (c) DNA double-helices in genes. [Images all adapted from free sources, Wikipedia]. O ne of the most fascinating phenomena in crystallization is self-assembly in the periodic repetition of the same circular- ringed patterns. All crystalline spherulites, including ring-banded spherulites (RBS), of polymers or small-molecule compounds are packed in an anisotropic fashion. Polymeric spherulites are highly isotropic with lamellar crystals highly aggregates of all kinds, and a standard table-top X-ray instrument has wide X-ray beams and inherent limitations and can perform analysis results only as a cumulative average of multiple lamellae of varied morphology or orientation, etc . A specific location of crystal size and orientation can be precisely measured only via microbeam X-ray analysis. A limitation of the surface morphology is that it is unable to predict how to explore the mechanism of 3D lamellar assembly in polymeric RBS. Polymeric RBS are constructed with periodic rings with alternate valleys and ridges in 3D space, not just 2D films. Self- assembled lamellar architectures of RBS can be examined in two ways, via destructive and non-destructive methods. In