期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 143, 期 42, 页码 17548-17556出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.1c07313
关键词
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资金
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC0206CH11357]
- Samsung Research Funding Center for Samsung Electronics, Korea [SRFC-MA1801-04]
- NRF Grants [2021R1A2C2006588, 2020R1A2C3004520]
- Ministry of Science, ICT & Future Planning (MSIP), Korea
- National Research Foundation of Korea [2020R1A2C3004520, 2021R1A2C2006588] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The study showed that weakening the hydrogen bonding of dendron apex leads to softer and smaller particles, forming various FK structures at lower temperatures, and even the new observation of a FK C14 phase in cone-shaped dendron systems. This indicates that the packing structures are mainly tuned by designing the hydrogen bonding interaction to balance the particle's interfacial tension and the chain's stretching.
Single-component polymeric materials open up a great potential for self-assembly into mesoscale complex crystal structures that are known as Frank-Kasper (FK) phases. Predicting the packing structures of the soft-matter spheres, however, remains a challenge even when the molecular design is precisely known. Here, we investigate the role of the molecules' enthalpic interaction in determining the low-symmetry crystal structures. To this end, we synthesize architecturally asymmetric dendrons by varying their apex functionalities and examine the packing structures of the second-generation (G2) dendritic wedges. Our work shows that weakening the hydrogen bonding of the dendron apex makes the particles softer and smaller, and leads to the formation of various FK structures at lower temperatures, including the new observation of a FK C14 phase in the cone-shaped dendron systems. As a consequence of the free energy balance between the particle's interfacial tension and the chain's stretching, various packing structures are mainly tuned by designing the hydrogen bonding interaction.
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