Optical imaging of surface chemistry and dynamics in confinement

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Science  25 Aug 2017:
Vol. 357, Issue 6353, pp. 784-788
DOI: 10.1126/science.aal4346

Imaging surfaces with water

The surfaces of real materials are often highly chemically heterogeneous, and the reported values of even simple properties such as surface acidity can vary widely in many cases. Macias-Romero et al. developed a microscope that images surfaces on the basis of second-harmonic generation from the orientation of interfacial water (see the Perspective by Hunger and Parekh). They followed the deprotonation of silica along glass micropipettes by changing solution pH and found many regions where the surface acidity deviated strongly from the average for the entire micropipette.

Science, this issue p. 784; see also p. 755

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