Confocal fluorescence spectrometry for observation of crystal dissolution kinetics

High-resolution stress mapping of Al2O3/monoclinic ZrO2 and Al2O3/cubic ZrO2(Y2O3) eutectics using scanning near-field optical microscopy

“…Local stresses in solid materials and mineralogical samples can also be evaluated from the shift of the peak position of vibrational and fluorescence spectra [6][7][8][9]. The dissolution kinetics of ionic solid in aqueous solution has also been observed using confocal fluorescence spectroscopy [10]. However, conventional spectroscopic analysis using optical microscopy, which is constrained by the wavelength of probe light, is inadequate to provide sufficient spatial resolution for elucidating the relationship between the microstructure and the residual stress distribution at a scale of less than several hundreds of nanometers.…”

Direct Two-Dimensional Time Series Observation of pH Distribution around Dissolving Calcium Carbonate Crystals in Aqueous Solution

“…While bulk pH measurement is a common practice in studying these reactions, − the data proved to be less indicative because the behavior and reactivity of water at or near the solid–fluid interface is often different from that in the bulk phase. Attempts were made in previous studies to address this issue using the optical second harmonic generation method, , spectrometry, microsensors, and scanning electrochemical microscopy . However, these techniques proved to be less effective because they failed to capture temporal and spatial variation of pH during crystal–fluid interactions and hence cannot provide details of the interfacial reaction.…”