期刊
SCIENCE ADVANCES
卷 8, 期 10, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abm5120
关键词
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资金
- National Research Foundation of the Korean government (MEST) [2020R1A2B5B03002697]
- Creative Materials Discovery Program - Ministry of Science and ICT [NRF-2018M3D1A1058536]
- KIST Institutional Program [2Z05900-19-P096]
- Brain Korea 21 Plus project
- Hagler Institute Fellowship
- National Research Foundation of Korea [2020R1A4A2002903]
- National Research Foundation of Korea [2020R1A2B5B03002697] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study visualizes and analyzes the structural defects that affect the rapid response of visible light in a block copolymer photonic crystal. It reveals the diffusional pathway of solvents through these defects.
Stimuli-interactive structural color (SC) of a block copolymer (BCP) photonic crystal (PC) uses reversible alteration of the PC using external fluids and applied forces. The origin of the diffusional pathways of a stimulating fluid into a BCP PC has not been examined. Here, we directly visualize the vertically oriented screw dislocations in a one-dimensional lamellar BCP PC that facilitate the rapid response of visible SC. To reveal the diffusional pathway of the solvent via the dislocations, BCP lamellae are swollen with an interpenetrated hydrogel network, allowing fixation of the swollen state and subsequent microscopic examination. The visualized defects are low-energy helicoidal screw dislocations having unique, nonsingular cores. Location and areal density of these dislocations are determined by periodic concentric topographic nanopatterns of the upper surface-reconstructed layer. The nonsingular nature of the interlayer connectivity in the core region demonstrates the beneficial nature of these defects on sensing dynamics.
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