期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 123, 期 29, 页码 6212-6221出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.9b04928
关键词
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资金
- DARPA [D15AP00107]
- DOE BES [DE-SC0019333]
- NSF [CHE1828666]
- U.S. Department of Energy (DOE) [DE-SC0019333] Funding Source: U.S. Department of Energy (DOE)
VSFG (vibrational sum frequency generation) microscopy was used to study the SDS@2 beta-CD system, a synthetic capsid-like self-assembled material. We found because of strong hydrogen-bond interactions between water and the assemblies, water molecules are template to adopt the local mesoscopic ordering of the self-assemblies, which allows VSFG to probe water on nonflat interfaces. We show that the origin of the VSFG signal from the self-assembly is a combination of individual molecular chirality and highly coordinated ordering of the self-assembly, which gives rise of anisotropic signals, e.g., under SSS polarization. A similar strategy could be applied to other self-assembled materials composed by molecules without inversion symmetry. Using an imaging process, VSFG spectra of different self-assembly sheets were spatially resolved. We found heterogeneity among different domains, which can be attributed to variations in the hydration level of different domains. Since the SDS@2 beta-CD system is a synthetic lattice self-assembly, such heterogeneity could also exist in other natural lattice assemblies such as a virus and tubulin.
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