光谱学
散射
材料科学
化学物理
机制(生物学)
曲面(拓扑)
纳米技术
分子物理学
光学
化学
物理
量子力学
几何学
数学
作者
Benjamin Rehl,Nathan Ronceray,Li Zhang,Aleksandra Rađenović,Sylvie Roke
出处
期刊:ACS Nano
[American Chemical Society]
日期:2025-07-03
标识
DOI:10.1021/acsnano.5c03589
摘要
A molecular understanding of the interactions between two-dimensional (2D) layered materials and liquids is crucial for nanofluidics, catalysis, and solution-based 2D material processing. Among 2D materials, hexagonal boron nitride (hBN) has a number of outstanding properties, but its interactions with liquids remain poorly characterized. Here, we investigate the interfacial structure of few-layer hBN nanoflakes suspensions in ethanol and ethanol-water mixtures. Electrophoretic light scattering suggests that the nanoflakes are effectively positively charged in ethanol and negatively charged in an ethanol-water mixture. Vibrational sum-frequency scattering spectroscopy reveals the surface structural changes underlying this charge reversal. Signatures of charge transfer of opposite direction are detected on both the flake lattice and in the liquid. The different (partial) charge distributions in ethanol and water explain the apparent charge reversal.
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