期刊
SCIENCE
卷 357, 期 6353, 页码 784-787出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aal4346
关键词
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资金
- Julia Jacobi Foundation
- Swiss National Science Foundation [200021-146884]
- European Research Council [616305]
- European Union [721766]
- Swiss National Science Foundation (SNF) [200021_146884] Funding Source: Swiss National Science Foundation (SNF)
We imaged the interfacial structure and dynamics of water in a microscopically confined geometry, in three dimensions and on millisecond time scales, with a structurally illuminated wide-field second harmonic microscope. The second harmonic images reported on the orientational order of interfacial water, induced by charge-dipole interactions between water molecules and surface charges. The images were converted into surface potential maps. Spatially resolved surface acid dissociation constant (pK(a,s)) values were determined for the silica deprotonation reaction by following pH-induced chemical changes on the curved and confined surfaces of a glass microcapillary immersed in aqueous solutions. These values ranged from 2.3 to 10.7 along the wall of a single capillary because of surface heterogeneities. Water molecules that rotate along an oscillating external electric field were also imaged.
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